YANG Data Models for 'Attachment Circuits'-as-a-Service (ACaaS)

YANG Data Models for 'Attachment Circuits'-as-a-Service (ACaaS) Orange

mohamed.boucadair@orange.com

Juniper

rroberts@juniper.net

Telefonica

oscar.gonzalezdedios@telefonica.com

Nokia

samier.barguil_giraldo@nokia.com

Huawei Technologies

lana.wubo@huawei.com

Operations and Management OPSAWG Slice Service L3VPN L2VPN This document specifies a YANG service data model for Attachment Circuits (ACs). The model can be used for the provisioning of ACs prior or during service provisioning (e.g., Network Slice Service). The document specifies also a module that updates other service and network modules with the required information to bind specific services to ACs that are created using the AC service model. The AC service model is designed with the intent to be reusable. Whether a service model reuses structures defined in the AC service model or simply include an AC reference is a design choice of these service models. Relying upon the AC model to manage ACs over which a service is delivered has the merit to decorrelate the management of a service vs. upgrade the AC components to reflect recent AC technologies or features. Each AC is identified with a unique identifier within a domain. The mapping between this AC and a network node (typically, a Provider Edge (PE)) that terminates an AC is hidden to the application/customer that makes use of the AC service model. Such an information is internal to the network controller. Thus, the details about the (network node-specific) attachment interfaces are not exposed in this service model. Discussion Venues Discussion of this document takes place on the Operations and Management Area Working Group Working Group mailing list (opsawg@ietf.org), which is archived at . Source for this draft and an issue tracker can be found at .

Introduction

Scope and Intended Use Connectivity services are provided by networks to customers via dedicated terminating points (e.g., service functions, customer edges (CEs), peer ASBRs, data centers gateways, Internet Exchange Points). A connectivity service is basically about ensuring data transfer received from (or destined to) a given terminating point to (or from) other terminating points that belong to the same customer/service, an interconnection node, or an ancillary node. A set of objectives for the connectivity service may eventually be negotiated and agreed upon between a customer a network provider. For that data transfer to take place within the provider network, it is assumed that adequate setup is provisioned over the links that connect customer terminating points and a provider network so that data can be successfully exchanged over these links. The required setup is referred to in this document as Attachment Circuits (ACs), while the underlying link is referred to as "bearers". This document adheres to the definition of an Attachment Circuit as provided in Section 1.2 of , especially:

Routers can be attached to each other, or to end systems, in a variety of different ways: PPP connections, ATM Virtual Circuits (VCs), Frame Relay VCs, ethernet interfaces, Virtual Local Area Networks (VLANs) on ethernet interfaces, GRE tunnels, Layer 2 Tunneling Protocol (L2TP) tunnels, IPsec tunnels, etc. We will use the term "attachment circuit" to refer generally to some such means of attaching to a router. An attachment circuit may be the sort of connection that is usually thought of as a "data link", or it may be a tunnel of some sort; what matters is that it be possible for two devices to be network layer peers over the attachment circuit.

When a customer requests a new value-added service, the service can be bound to existing attachment circuits or trigger the instantiation of new attachment circuits. The provisioning of an value-added service should, thus, accommodate both deployments. Also, because the instantiation of an attachment circuit requires coordinating the provisioning of endpoints that might not belong to the same administrative entity (customer vs. provider or distinct operational teams within the same provider, etc.), programmatic means to expose 'attachment circuits'-as-a-service will greatly simplify the provisioning of value added services that will be delivered over an attachment circuits. This document specifies a YANG service data model for managing attachment circuits that are exposed by a network to its customers (e.g., an enterprise site, a network function, a hosting infrastructure, a peer network provider). The model can be used for the provisioning of ACs prior or during advanced service provisioning (e.g., Network Slice Service). The model is designed with the intent to be reusable. Whether a service model reuses structures defined in the AC service model or simply includes an AC reference (that was communicated during AC service instantiation) is a design choice of these service models. Relying upon the AC service model to manage ACs over which services are delivered has the merit to decorrelate the management of the (core) service vs. upgrade the AC components to reflect recent AC technologies or new features (e.g., new encryption scheme, additional routing protocol). This document favors the approach of completely relying upon the AC service model instead of duplicating into specific modules of advanced services that are delivered over an Attachment Circuit. An AC service request can provide a reference to a bearer or peer SAPs. Both schemes are supported in the AC service model. Each AC is identified with a unique identifier within a (provider) domain. From a network provider standpoint, an AC can be bound to a single or multiple Service Attachment Points (SAPs) . Likewise, a SAP can be bound to one or multiple ACs. However, the mapping between an AC and a PE in the provider network that terminates that AC is hidden to the application that makes use of the AC service model. Such mapping information is internal to the network controllers. As such, the details about the (node-specific) attachment interfaces are not exposed in the AC service model. The AC service model does not make any assumption about the internal structure or even the nature or the services that will be delivered over an attachment circuit. Customers do not have access to that network view other than the ACes that the ordered. For example, the AC service model can be used to provision a set of ACes to connect multiple sites (Site1, Site2, ..., SiteX) for customer that also requested VPN services. If these provisioning of these services require specific configured on ASBR nodes, such configuration is handled at the network level and is not exposed at the service level to the customer. However, the network controller will have access to such a view as the service points in these ASBRs will be exposed as SAPs with "role" set to "ietf-sap-ntw:nni" . provides a set of examples to illustrate the use of the AC service model. These examples use the IPv4 address blocks reserved for documentation , the IPv6 prefix reserved for documentation , and the Autonomous System (AS) numbers reserved for documentation . The YANG data models in this document conform to the Network Management Datastore Architecture (NMDA) defined in .

Position ACaaS vs. Other Data Models The model specified in this document is not a network model . As such, the model does not expose details related to specific nodes in the provider's network that terminate a requested AC. The mapping between an AC as seen by a customer and the network implementation of an AC is maintained by the network controllers and not exposed to the customer. Such a mapping can be maintained using a variety of network models, e.g., Service Attachment Points (SAPs) , AC Network Model , etc. The AC service model is not a device model. A network provider may use a variety of device models (e.g., Routing management or BGP ) to provision an AC service. The document specifies also a module () that updates other service and network modules with the required information to bind services to specific ACs that are created using the AC service model. It is anticipated that future revisions of the L3SM/L2SM can make use of the AC service model, by (preferably) offloading all the AC-related management matters from the core L3SM/L2SM to focus on L2/L3 VPN service matters.

Why Not Using L2SM as Reference Data Model for ACaaS? The L2SM covers some AC-related considerations. Nevertheless, the L2SM structure is too layer 2 centric. For example, the L2SM part does not cover Layer 3 provisioning, which is required for the instantiation of typical ACs.

Why Not Using L3SM as Reference Data Model for ACaaS? Similar to the L2NM, the L3SM covers some AC-related considerations. Nevertheless, the L3SM structure does not adequately cover layer 2 provisioning matters. Moreover, the L3SM is drawn with conventional L3VPN deployments in mind and, as such, has some limitations for instantiating ACs in other deployment contexts (e.g., cloud environments). For example, the L3SM does not allow to provision multiple BGP sessions over the same AC.

Conventions and Definitions The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 when, and only when, they appear in all capitals, as shown here. The meanings of the symbols in the YANG tree diagrams are defined in . This document uses the following terms:

Bearer:: A physical or logical link that connects a customer node (or site) to a provider network. A bearer can be a wireless or wired link. One or multiple technologies can be used to build a bearer. The bearer type can be specified by a customer.
: The operator allocates a unique bearer reference to identify a bearer within its network (e.g., customer line identifier). Such a reference can be retrieved by a customer and used in subsequent service placement requests to unambiguously identify where a service is to be bound.
: The concept of bearer can be generalized to refer to the required underlying connection for the provisioning of an attachment circuit. One or multiple attachment circuits may be hosted over the same bearer (e.g., multiple VLANs on the same bearer that is provided by a physical link).
Network controller:: Denotes a functional entity responsible for the management of the service provider network.
Service orchestrator:: Refers to a functional entity that interacts with the customer of a network service. The service orchestrator is typically responsible for the attachment circuits, the Provider Edge (PE) selection, and requesting the activation of the requested service to a network controller.
Service provider network:: A network that is able to provide network services (e.g., Network Slice Services).
Service provider:: A service provider that offers network services (e.g., Network Slice Services).

Sample Uses of the Attachment Circuit Data Models depicts two target topology flavors that involve ACs. These topologies are characterized as follows:

A Customer Terminating Point (CTP) may be a physical node or a logical entity. A CTP is seen by the network as a peer SAP.
The same AC request may include one or multiple ACs that may belong to one or both of these flavors. For the sake of simplfying the illustration, only a subset of these ACs is shown in .
CTPs may be dedicated to one single service or host multiple services (e.g., service functions ).
A single AC (as seen by a network provider) may be bound to one or multiple peer SAPs (i.e., CTPs in this example). For example, and as discussed in , multiple CTPs (CEs) can be attached to a PE over the same attachment circuit. This is typically implemented if the layer 2 infrastructure between the CTP and the network provides a multipoint service.

Examples of ACs

Separate AC Provisioning vs. Actual Service Provisioning The procedure to provision a service in a service provider network may depend on the practices adopted by a service provider, including the flow put in place for the provisioning of advanced network services and how they are bound to an attachment circuit. For example, the same attachment circuit may be used to host multiple services. In order to avoid service interference and redundant information in various locations, a service provider may expose an interface to manage ACs network-wide. Customers can the request a base attachment circuit to be put in place, and then refer to that base AC when requesting services that are bound to that AC. shows the positioning of the AC service model is the overall service delivery process.

An Example of AC Model Usage

Examples This section includes a non-exhaustive list of examples to illustrate the use of the AC service model.

Request A New Bearer An example of a request message body to create a bearer is shown in .

Example of a Message Body to Create A New Bearer A bearer-reference is then generated by the controller for this bearer. shows the example of a response message body that is sent by the controller to reply to a GET request:

Example of a Response Message Body with the Bearer Reference

Request An AC over An Existing Bearer An example of a request message body to create a simple AC over an existing bearer is shown in . The bearer reference is assumed to be known to both the customer and the network provider. Such a reference can be retrieved, e.g., following the example described in or using other means (including, exchanged out-of-band or via proprietary APIs).

Example of a Message Body to Request an AC over an Existing Bearer

Request An AC for a Knwon Peer SAP An example of a request to create a simple AC, when the peer SAP is known, is shown in . In this example, the peer SAP identifier points to an identifier of a service function. The (topological) location of that service function is assumed to be known to the network controller. For example, this can be determined as part of an on-demand procedure to instantiate a service function in a cloud. That instantiated service function can be granted a connectivity service via the provider network.

Example of a Message Body to Request an AC with a Peer SAP

One CE, Two ACs Lets consider the example of an eNodeB (CTP) that is directly connected to the access routers of the mobile backhaul (see ). In this example, two ACs are needed to service the eNodeB.

Example of a CE-PE ACs An example of a request to create the ACs to service the eNodeB is shown in . This example assumes that static addressing is used for both ACs.

Example of a Message Body to Request Two ACes on The Same Link

Control Precedence over Multiple ACs When multiple ACs are requested by the same customer (for the same site), the request can tag one of these ACes as "primary" and the other ones as "secondary". An example of such a request is shown in . In this example, both ACes are bound to the same "group-id", and the "precedence" data node is set as a function of the intended role of each AC (primary or secondary).

Example of a Message Body to Associate a Precedence Level with ACes

Illustrate the Use of Global Profiles An example of a request to create two ACs to service the same CE on the same link is shown in . Unlike , this example factorizes some of the redundant data.

Example of a Message Body to Request Two ACes on The Same Link (Global Profile)

Illustrate the Use of Per-Node Profiles An example of a request to create two ACs to service the same CE on the same link is shown in . Unlike , this example factorizes all redundant data.

Example of a Message Body to Request Two ACes on The Same Link (Node Profile) A customer may request adding a new AC by simply referring to an existing per-node AC profile as shown in . This AC inherites all the data that was enclosed in the indicated per-node AC profile (IP addressing, routing, etc.).

Example of a Message Body to Add a new AC over an existing link (Node Profile)

Multiple CEs shows an example of CEs that are interconnected by a service provider network.

Network Topology Example depicts an example of the message body of a request to instantiate the various ACs that are shown in .

Example of a Message Body of a Request to Create Multiple ACs bound to Multiple CEs

Binding Attachment Circuits to an IETF Network Slice This example shows how the AC service model complements to connect a site to a slice service. Firstly, describes the end-to-end network topology as well the orchestration scopes:

The topology is made up of two sites (site1 and site2), interconnected via a Transport Network (e.g. IP/MPLS Network). A Network Function is deployed within each site in a dedicated IP Subnet.
A 5G SMO is responsible for the deployment Network Functions and the indirect management of a local Gateway (i.e., CE device).
An IETF Network Slice Controller is responsible for the deployment of IETF Network Slices accross the TN.

Network Functions are deployed within each site.

An Example of a Network Topology Used to Deploy Slices describes the logical connectivity enforced thanks to both IETF Network Slice and Attachment Circuit models.

Logical Overview shows the message body of the request to create the required ACs using the Attachment Circuit module.

Message Body of a Request to Create Required ACs shows the message body of the request to create the a slice service bound to the ACs created using . Only references to these ACs are included in the Slice Service request. This example assumes that the module defined is also supported by the NSC.

Message Body of a Request to Create a Slice Service Referring to the ACs

Connecting a Virtualized Environment Running in a Cloud Provider This example () shows how the AC service model can be used to connect a Cloud Infrastructure to a service provider network. This example makes the following assumptions:

A customer (e.g., Mobile Network Team or partner) has a virtualized infrastructure running in a Cloud Provider. A simplistic deployment is represented here with a set of Virtual Machines running in a Virtual Private Environment. The deployment and management of this infrastructure is achieved via private APIs that are supported by the Cloud Provider: this realization is out of the scope of this document.
The connectivity to the Data Center is achieved thanks to a service based on direct attachment (physical connection), which is delivered upon ordering via an API exposed by the Cloud Provider. When ordering that connection, a unique "Connection Identifier" is generated and returned via the API.
The customer provisions the networking logic within the Cloud Provider based on that unique connection Identifier (i.e., logical interfaces, IP addressing, and routing).

An Example of Realization for Connecting a Cloud Site illustrates the pre-provisioning logic for the physical connection to the Cloud Provider. After this connection is delivered to the service provider, the network inventory is updated with "bearer-reference" set to the value of the "Connection Identifier".

Illustration of Pre-provisioning Next, API workflows can be initiated:

Cloud Provider for the configuration as per (3) above.
Service provider network via the Attachment Circuit model. This request can be used in conjunction with additional requests based on L3SM (VPN provisioning) or Network Slice Service model (5G hybrid Cloud deployment).

shows the message body of the request to create the required ACs to connect the Cloud Provider Virtualized (VM) using the Attachment Circuit module. Note that this Cloud Provider mandates the use of MD5 authentication for establishing BGP connections.

The module supports MD5 to basically accommodate the installed BGP base (including by some Cloud Providers). Note that MD5 suffers from the security weaknesses discussed in Section 2 of and Section 2.1 of .

Message Body of a Request to Create the ACs for Connecting to the Cloud Provider

Description of the Service Models

The Attachment Circuit Service YANG Module

Overall Structure of the Module The overall tree structure of the AC service module is shown in .

Overall AC Service Tree Structure The full tree structure is provided in . Each AC is identified with a unique identifier within a domain. The mapping between this AC and a local PE that terminates the AC is hidden to the application that makes use of the AC service model. This information is internal to the Network controller. As such, the details about the (node-specific) attachment interfaces are not exposed in this service model.

Service Profiles

Description The 'specific-provisioning-profiles' container () can be used by a service provider to maintain a set of specific profiles that are similar to those defined in . The exact definition of the profiles is local to each service provider. The model only includes an identifier for these profiles in order to facilitate identifying and binding local policies when building an AC.

Service Proviles As shown in , two profile types can be defined: 'specific-provisioning-profiles' and 'service-provisioning-profiles'. Whether only specific profiles, service profiles, or a combination thereff are used is local to each service provider. The following specific rovisioning profiles can be defined:

'external-connectivity-identifier':: Refers to a profile that defines the external connectivity provided to a site that is connected via an AC. External connectivity may be access to the Internet or restricted connectivity, such as access to a public/private cloud.
'encryption-profile-identifier':: Refers to a set of policies related to the encryption setup that can be applied when provisioning an AC.
'qos-profile-identifier':: Refers to a set of policies, such as classification, marking, and actions (e.g., ).
'bfd-profile-identifier':: Refers to a set of Bidirectional Forwarding Detection (BFD) policies that can be invoked when building an AC.
'forwarding-profile-identifier':: Refers to the policies that apply to the forwarding of packets conveyed within an AC. Such policies may consist, for example, of applying Access Control Lists (ACLs).
'routing-profile-identifier':: Refers to a set of routing policies that will be invoked (e.g., BGP policies) when building an AC.

Referencing Service/Specific Profiles All these profiles are uniquely identified by the NETCONF/RESTCONF server by an identifier. To ease referencing these profiles by other data models, specific typedefs are defined for each of these profiles. Likewise, an attachment circuit referenc typedef is defiened when referencing a (global) attachment circuit by its name is required. These typedefs SHOULD be used when other modules need a reference to one of these profiles or attahment circuits.

Attachment Circuits Profiles

Node-Specific Profiles

Bearers shows the sub-tree for managing the bearers (that is, the properties of the attachment that are below Layer 3). A bearer can be a wireless or wired link. A reference to a bearer is generated by the operator. Such a reference can be used, e.g., in a subsequent service request to create an AC. The anchroing of the AC can also be achieved by indicating (with or without a bearer reference), a peer SAP identifier (e.g., An identifier of a Service Function).

Bearers Tree Structure The same customer site (CE, NF, etc.) can terminate one or multiple bearers; each of them uniquely identified by a refrence that is assigned by the network provider. These bearers can terminate on the same or distinct network nodes. CEs that terminate multiple bearers are called multi-homed CEs.

Attachment Circuits The structure of 'attachment-circuits' is shown in .

Overall Attachment Circuits Tree Structure

Layer 2 Connection Structure As shown in the tree depicted in , the 'l2-connection' container defines service parameters to enable such connectivity at Layer 2.

Layer 2 Connection Tree Structure

Layer 3 Connection Structure The 'l3-connection' container defines a set of service parameters to enable Layer 3 connectivity for an AC. Both IPv4 and IPv6 parameters are supported. shows the structure of the IPv4 connection.

Layer 3 Connection Tree Structure (IPv4) shows the structure of the IPv6 connection.

Layer 3 Connection Tree Structure (IPv6)

Routing As shown in the tree depicted in , the 'routing-protocols' container defines th erequired parameters to enable the required routing features for an AC. One or more routing protocols can be associated with an AC. Such routing protocols are then enabled between a PE and the CE. Each routing instance is uniquely identified to accommodate scenarios where multiple instances of the same routing protocol have to be configured on the same link. In addition to static routing, the module supports the following routing protocols:

BGP
OSPF or
IS-IS
RIP

The model also supports the Virtual Router Redundancy Protocol (VRRP) on an AC.

OAM As shown in the tree depicted in , the 'oam' container defines OAM-related parameters of an AC.

OAM Tree Structure

Security As shown in the tree depicted in , the 'security' container defines a set of AC security parameters.

Security Tree Structure

YANG Module This module uses types defined in , , and . WG List: Editor: Mohamed Boucadair Author: Richard Roberts Author: Oscar Gonzalez de Dios Author: Samier Barguil Author: Bo Wu "; description "This YANG module defines a generic YANG model for exposing attachment circuits as a service. Copyright (c) 2023 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Revised BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info). This version of this YANG module is part of RFC xxx; see the RFC itself for full legal notices."; revision 2022-11-30 { description "Initial revision."; reference "RFC xxxx: A YANG Service Data Model for Attachment Circuits"; } // Identities identity bearer-type { description "Base identity for bearers type."; } identity ethernet { base bearer-type; description "Ethernet."; } identity wireless { base bearer-type; description "Wireless."; } identity address-allocation-type { description "Base identity for address allocation type in the AC."; } identity provider-dhcp { base address-allocation-type; description "The provider's network provides a DHCP service to the customer."; } identity provider-dhcp-relay { base address-allocation-type; description "The provider's network provides a DHCP relay service to the customer."; } identity provider-dhcp-slaac { if-feature "vpn-common:ipv6"; base address-allocation-type; description "The provider's network provides a DHCP service to the customer as well as IPv6 Stateless Address Autoconfiguration (SLAAC)."; reference "RFC 4862: IPv6 Stateless Address Autoconfiguration"; } identity static-address { base address-allocation-type; description "The provider's network provides static IP addressing to the customer."; } identity slaac { if-feature "vpn-common:ipv6"; base address-allocation-type; description "The provider's network uses IPv6 SLAAC to provide addressing to the customer."; reference "RFC 4862: IPv6 Stateless Address Autoconfiguration"; } identity dynamic-infra { base address-allocation-type; description "The IP address is dynamically allocated by the hosting infrastrcture."; } identity local-defined-next-hop { description "Base identity of local defined next hops."; } identity discard { base local-defined-next-hop; description "Indicates an action to discard traffic for the corresponding destination. For example, this can be used to black-hole traffic."; } identity local-link { base local-defined-next-hop; description "Treat traffic towards addresses within the specified next-hop prefix as though they are connected to a local link."; } identity l2-tunnel-type { description "Base identity for Layer 2 tunnel selection under the VPN network access."; } identity pseudowire { base l2-tunnel-type; description "Pseudowire tunnel termination in the VPN network access."; } identity vpls { base l2-tunnel-type; description "Virtual Private LAN Service (VPLS) tunnel termination in the VPN network access."; } identity vxlan { base l2-tunnel-type; description "Virtual eXtensible Local Area Network (VXLAN) tunnel termination in the VPN network access."; } identity precedence-type { description "Redundancy type. The service can be created with primary and secondary tagging."; } identity primary { base precedence-type; description "Identifies the main attachment circuit."; } identity secondary { base precedence-type; description "Identifies the secondary attachment circuit."; } /* Typedefs */ typedef predefined-next-hop { type identityref { base local-defined-next-hop; } description "Predefined next-hop designation for locally generated routes."; } typedef area-address { type string { pattern '[0-9A-Fa-f]{2}(\.[0-9A-Fa-f]{4}){0,6}'; } description "This type defines the area address format."; } typedef attachment-circuit-reference { type leafref { path "/ac-svc:attachment-circuits/ac-svc:ac/ac-svc:name"; } description "Defines a reference to an attachment circuit that can be used by other modules."; } typedef ac-global-profile-reference { type leafref { path "/ac-svc:attachment-circuits/ac-svc:ac-global-profile" + "/ac-svc:id"; } description "Defines a reference to a gloabl attachment circuit that can be used by other modules."; } typedef ac-node-group-reference { type leafref { path "/ac-svc:attachment-circuits/ac-svc:ac-node-group" + "/ac-svc:id"; } description "Defines a reference to a per-node attachment circuit that can be used by other modules."; } typedef encryption-profile-reference { type leafref { path "/ac-svc:specific-provisioning-profiles/ac-svc:valid-provider-identifiers" + "/ac-svc:encryption-profile-identifier/ac-svc:id"; } description "Defines a type to an encryption profile for referencing purposes."; } typedef qos-profile-reference { type leafref { path "/ac-svc:specific-provisioning-profiles/ac-svc:valid-provider-identifiers" + "/ac-svc:qos-profile-identifier/ac-svc:id"; } description "Defines a type to a QoS profile for referencing purposes."; } typedef bfd-profile-reference { type leafref { path "/ac-svc:specific-provisioning-profiles/ac-svc:valid-provider-identifiers" + "/ac-svc:bfd-profile-identifier/ac-svc:id"; } description "Defines a type to a BFD profile for referencing purposes."; } typedef forwarding-profile-reference { type leafref { path "/ac-svc:specific-provisioning-profiles/ac-svc:valid-provider-identifiers" + "/ac-svc:forwarding-profile-identifier/ac-svc:id"; } description "Defines a type to a forwarding profile for referencing purposes."; } typedef routing-profile-reference { type leafref { path "/ac-svc:specific-provisioning-profiles/ac-svc:valid-provider-identifiers" + "/ac-svc:routing-profile-identifier/id"; } description "Defines a type to a routing profile for referencing purposes."; } /* typedef bearer-reference { type leafref { path "/ac-svc:bearers/ac-svc:bearer/ac-svc:id"; } description "Defines a type to a bearer for referencing purposes."; }*/ // L2 connection grouping l2-connection-profile { description "Defines Layer 2 protocols and parameters that can be factorized when provisioning Layer 2 connectivity."; container encapsulation { description "Container for Layer 2 encapsulation."; leaf type { type identityref { base vpn-common:encapsulation-type; } //default "vpn-common:priority-tagged"; description "Encapsulation type. By default, the type of the tagged interface is 'priority-tagged'."; } container dot1q { when "derived-from-or-self(../type, 'vpn-common:dot1q')" { description "Only applies when the type of the tagged interface is 'dot1q'."; } description "Tagged interface."; leaf tag-type { type identityref { base vpn-common:tag-type; } default "vpn-common:c-vlan"; description "Tag type. By default, the tag type is 'c-vlan'."; } leaf cvlan-id { type uint16 { range "1..4094"; } description "VLAN identifier."; } } container qinq { when "derived-from-or-self(../type, 'vpn-common:qinq')" { description "Only applies when the type of the tagged interface is 'qinq'."; } description "Includes QinQ parameters."; leaf tag-type { type identityref { base vpn-common:tag-type; } default "vpn-common:s-c-vlan"; description "Tag type."; } leaf svlan-id { type uint16; mandatory true; description "Service VLAN (S-VLAN) identifier."; } leaf cvlan-id { type uint16; mandatory true; description "Customer VLAN (C-VLAN) identifier."; } } } } grouping l2-connection { description "Defines Layer 2 protocols and parameters that are used to enable AC connectivity."; container encapsulation { description "Container for Layer 2 encapsulation."; leaf type { type identityref { base vpn-common:encapsulation-type; } //default "vpn-common:priority-tagged"; description "Encapsulation type. By default, the type of the tagged interface is 'priority-tagged'."; } container dot1q { when "derived-from-or-self(../type, 'vpn-common:dot1q')" { description "Only applies when the type of the tagged interface is 'dot1q'."; } description "Tagged interface."; leaf tag-type { type identityref { base vpn-common:tag-type; } default "vpn-common:c-vlan"; description "Tag type. By default, the tag type is 'c-vlan'."; } leaf cvlan-id { type uint16 { range "1..4094"; } description "VLAN identifier."; } } container priority-tagged { when "derived-from-or-self(../type, " + "'vpn-common:priority-tagged')" { description "Only applies when the type of the tagged interface is 'priority-tagged'."; } description "Priority tagged."; leaf tag-type { type identityref { base vpn-common:tag-type; } default "vpn-common:c-vlan"; description "Tag type. By default, the tag type is 'c-vlan'."; } } container qinq { when "derived-from-or-self(../type, 'vpn-common:qinq')" { description "Only applies when the type of the tagged interface is 'qinq'."; } description "Includes QinQ parameters."; leaf tag-type { type identityref { base vpn-common:tag-type; } default "vpn-common:s-c-vlan"; description "Tag type."; } leaf svlan-id { type uint16; mandatory true; description "Service VLAN (S-VLAN) identifier."; } leaf cvlan-id { type uint16; mandatory true; description "Customer VLAN (C-VLAN) identifier."; } } } choice l2-service { description "The Layer 2 connectivity service can be provided by indicating a pointer to an L2VPN or by specifying a Layer 2 tunnel service."; container l2-tunnel-service { description "Defines a Layer 2 tunnel termination. It is only applicable when a tunnel is required. The supported values are 'pseudowire', 'vpls', and 'vxlan'. Other values may be defined, if needed."; leaf type { type identityref { base l2-tunnel-type; } description "Selects the tunnel termination option for each AC Endpoint."; } container pseudowire { when "derived-from-or-self(../type, 'pseudowire')" { description "Only applies when the Layer 2 service type is 'pseudowire'."; } description "Includes pseudowire termination parameters."; leaf vcid { type uint32; description "Indicates a pseudowire (PW) or virtual circuit (VC) identifier."; } leaf far-end { type union { type uint32; type inet:ip-address; } description "Neighbor reference."; reference "RFC 8077: Pseudowire Setup and Maintenance Using the Label Distribution Protocol (LDP), Section 6.1"; } } container vpls { when "derived-from-or-self(../type, 'vpls')" { description "Only applies when the Layer 2 service type is 'vpls'."; } description "VPLS termination parameters."; leaf vcid { type uint32; description "VC identifier."; } leaf-list far-end { type union { type uint32; type inet:ip-address; } description "Neighbor reference."; } } container vxlan { when "derived-from-or-self(../type, 'vxlan')" { description "Only applies when the Layer 2 service type is 'vxlan'."; } description "VXLAN termination parameters."; leaf vni-id { type uint32; mandatory true; description "VXLAN Network Identifier (VNI)."; } leaf peer-mode { type identityref { base vpn-common:vxlan-peer-mode; } default "vpn-common:static-mode"; description "Specifies the VXLAN access mode. By default, the peer mode is set to 'static-mode'."; } leaf-list peer-ip-address { type inet:ip-address; description "List of a peer's IP addresses."; } } } case l2vpn { leaf l2vpn-id { type vpn-common:vpn-id; description "Indicates the L2VPN service associated with an Integrated Routing and Bridging (IRB) interface."; } } } leaf bearer-reference { if-feature "vpn-common:bearer-reference"; type string; description "This is an internal reference for the service provider to identify the bearer associated with this AC."; } } grouping ip-connection-global-profile { description "Defines IP connection parameters."; container ipv4 { if-feature "vpn-common:ipv4"; description "IPv4-specific parameters."; leaf prefix-length { type uint8 { range "0..32"; } description "Subnet prefix length expressed in bits. It is applied to both local and customer addresses."; } leaf address-allocation-type { type identityref { base address-allocation-type; } must "not(derived-from-or-self(current(), 'slaac') or " + "derived-from-or-self(current(), " + "'provider-dhcp-slaac'))" { error-message "SLAAC is only applicable to IPv6."; } default "static-address"; description "Defines how addresses are allocated to the peer site. If there is no value for the address allocation type, then IPv4 addressing is not enabled."; } choice allocation-type { description "Choice of the IPv4 address allocation."; case dynamic { description "When the addresses are allocated by DHCP or other dynamic means local to the infrastructure."; choice provider-dhcp { description "Parameters related to DHCP-allocated addresses. IP addresses are allocated by DHCP, which is provided by the operator."; leaf dhcp-service-type { type enumeration { enum server { description "Local DHCP server."; } enum relay { description "Local DHCP relay. DHCP requests are relayed to a provider's server."; } } description "Indicates the type of DHCP service to be enabled on this AC."; } } choice dhcp-relay { description "The DHCP relay is provided by the operator."; container customer-dhcp-servers { description "Container for a list of the customer's DHCP servers."; leaf-list server-ip-address { type inet:ipv4-address; description "IPv4 addresses of the customer's DHCP server."; } } } } } } container ipv6 { if-feature "vpn-common:ipv6"; description "IPv6-specific parameters."; leaf prefix-length { type uint8 { range "0..128"; } description "Subnet prefix length expressed in bits. It is applied to both local and customer addresses."; } leaf address-allocation-type { type identityref { base address-allocation-type; } default "static-address"; description "Defines how addresses are allocated. If there is no value for the address allocation type, then IPv6 addressing is disabled."; } choice allocation-type { description "Choice of the IPv6 address allocation."; case dynamic { description "When the addresses are allocated by DHCP or other dynamic means local to the infrastructure."; choice provider-dhcp { description "Parameters related to DHCP-allocated addresses. IP addresses are allocated by DHCP, which is provided by the operator."; leaf dhcp-service-type { type enumeration { enum server { description "Local DHCP server."; } enum relay { description "Local DHCP relay. DHCP requests are relayed to a provider's server."; } } description "Indicates the type of DHCP service to be enabled on this access."; } } choice dhcp-relay { description "The DHCP relay is provided by the operator."; container customer-dhcp-servers { description "Container for a list of the customer's DHCP servers."; leaf-list server-ip-address { type inet:ipv6-address; description "IPv6 addresses of the customer's DHCP server."; } } } } } } } grouping ip-connection { description "Defines IP connection parameters."; container ipv4 { if-feature "vpn-common:ipv4"; description "IPv4-specific parameters."; leaf local-address { type inet:ipv4-address; description "The IP address used at the provider's interface."; } leaf virtual-address { type inet:ipv4-address; description "This addresss may be used for redundancy purposes."; } leaf prefix-length { type uint8 { range "0..32"; } description "Subnet prefix length expressed in bits. It is applied to both local and customer addresses."; } leaf address-allocation-type { type identityref { base address-allocation-type; } must "not(derived-from-or-self(current(), 'slaac') or " + "derived-from-or-self(current(), " + "'provider-dhcp-slaac'))" { error-message "SLAAC is only applicable to IPv6."; } default "static-address"; description "Defines how addresses are allocated to the peer site. If there is no value for the address allocation type, then IPv4 addressing is not enabled."; } choice allocation-type { description "Choice of the IPv4 address allocation."; case dynamic { description "When the addresses are allocated by DHCP or other dynamic means local to the infrastructure."; choice address-assign { default "number"; description "A choice for how IPv4 addresses are assigned."; case number { leaf number-of-dynamic-address { type uint16; default "1"; description "Specifies the number of IP addresses to be assigned to the customer on this access."; } } case explicit { container customer-addresses { description "Container for customer addresses to be allocated using DHCP."; list address-pool { key "pool-id"; description "Describes IP addresses to be dyncamically allocated. When only 'start-address' is present, it represents a single address. When both 'start-address' and 'end-address' are specified, it implies a range inclusive of both addresses."; leaf pool-id { type string; description "A pool identifier for the address range from 'start-address' to 'end-address'."; } leaf start-address { type inet:ipv4-address; mandatory true; description "Indicates the first address in the pool."; } leaf end-address { type inet:ipv4-address; description "Indicates the last address in the pool."; } } } } } choice provider-dhcp { description "Parameters related to DHCP-allocated addresses. IP addresses are allocated by DHCP, which is provided by the operator."; leaf dhcp-service-type { type enumeration { enum server { description "Local DHCP server."; } enum relay { description "Local DHCP relay. DHCP requests are relayed to a provider's server."; } } description "Indicates the type of DHCP service to be enabled on this AC."; } } choice dhcp-relay { description "The DHCP relay is provided by the operator."; container customer-dhcp-servers { description "Container for a list of the customer's DHCP servers."; leaf-list server-ip-address { type inet:ipv4-address; description "IPv4 addresses of the customer's DHCP server."; } } } } case static-addresses { description "Lists the IPv4 addresses that are used."; /*leaf primary-address { type leafref { path "../address/address-id"; } description "Primary IP address of the connection."; }*/ list address { key "address-id"; ordered-by user; description "Lists the IPv4 addresses that are used. The first address of the list is the primary address of the connection."; leaf address-id { type string; description "An identifier of the static IPv4 address."; } leaf customer-address { type inet:ipv4-address; description "An IPv4 address of the customer side."; } } } } } container ipv6 { if-feature "vpn-common:ipv6"; description "IPv6-specific parameters."; leaf local-address { type inet:ipv6-address; description "IPv6 address of the provider side."; } leaf virtual-address { type inet:ipv6-address; description "This addresss may be used for redundancy purposes."; } leaf prefix-length { type uint8 { range "0..128"; } description "Subnet prefix length expressed in bits. It is applied to both local and customer addresses."; } leaf address-allocation-type { type identityref { base address-allocation-type; } default "static-address"; description "Defines how addresses are allocated. If there is no value for the address allocation type, then IPv6 addressing is disabled."; } choice allocation-type { description "Choice of the IPv6 address allocation."; case dynamic { description "When the addresses are allocated by DHCP or other dynamic means local to the infrastructure."; choice address-assign { default "number"; description "A choice for how IPv6 addresses are assigned."; case number { leaf number-of-dynamic-address { type uint16; default "1"; description "Specifies the number of IP addresses to be assigned to the customer on this access."; } } case explicit { container customer-addresses { description "Container for customer addresses to be allocated using DHCP."; list address-pool { key "pool-id"; description "Describes IP addresses to be dyncamically allocated. When only 'start-address' is present, it represents a single address. When both 'start-address' and 'end-address' are specified, it implies a range inclusive of both addresses."; leaf pool-id { type string; description "A pool identifier for the address range from 'start-address' to 'end-address'."; } leaf start-address { type inet:ipv6-address; mandatory true; description "Indicates the first address in the pool."; } leaf end-address { type inet:ipv6-address; description "Indicates the last address in the pool."; } } } } } choice provider-dhcp { description "Parameters related to DHCP-allocated addresses. IP addresses are allocated by DHCP, which is provided by the operator."; leaf dhcp-service-type { type enumeration { enum server { description "Local DHCP server."; } enum relay { description "Local DHCP relay. DHCP requests are relayed to a provider's server."; } } description "Indicates the type of DHCP service to be enabled on this access."; } } choice dhcp-relay { description "The DHCP relay is provided by the operator."; container customer-dhcp-servers { description "Container for a list of the customer's DHCP servers."; leaf-list server-ip-address { type inet:ipv6-address; description "IPv6 addresses of the customer's DHCP server."; } } } } case static-addresses { description "Lists the IPv6 addresses that are used."; /*leaf primary-address { type leafref { path "../address/address-id"; } description "Primary IP address of the connection."; }*/ list address { key "address-id"; ordered-by user; description "Lists the IPv6 addresses that are used. The first address of the list is the primary IP address of the connection."; leaf address-id { type string; description "An identifier of the static IPv6 address."; } leaf customer-address { type inet:ipv6-address; description "An IPv6 address of the customer side."; } } } } } } /* Routing */ grouping routing-profile { description "Defines routing protocols."; list routing-protocol { key "id"; description "List of routing protocols used on the AC."; leaf id { type string; description "Unique identifier for the routing protocol."; } leaf type { type identityref { base vpn-common:routing-protocol-type; } description "Type of routing protocol."; } list routing-profiles { key "id"; description "Routing profiles."; leaf id { type routing-profile-reference; description "Reference to the routing profile to be used."; } leaf type { type identityref { base vpn-common:ie-type; } description "Import, export, or both."; } } container bgp { when "derived-from-or-self(../type, 'vpn-common:bgp-routing')" { description "Only applies when the protocol is BGP."; } description "Configuration specific to BGP."; container peer-groups { description "Configuration for BGP peer-groups"; list peer-group { key "name"; description "List of BGP peer-groups configured on the local system - uniquely identified by peer-group name"; leaf name { type string; description "Name of the BGP peer-group"; } leaf local-as { type inet:as-number; config false; description "Indicates a local AS Number (ASN). This ASN is exposed to a customer so that it knows which ASN to use to set up a BGP session."; } leaf peer-as { type inet:as-number; description "Indicates the customer's ASN when the customer requests BGP routing."; } leaf address-family { type identityref { base vpn-common:address-family; } description "This node contains the address families to be activated. 'dual-stack' means that both IPv4 and IPv6e will b activated."; } } } } container ospf { when "derived-from-or-self(../type, " + "'vpn-common:ospf-routing')" { description "Only applies when the protocol is OSPF."; } description "Configuration specific to OSPF."; leaf address-family { type identityref { base vpn-common:address-family; } description "Indicates whether IPv4, IPv6, or both are to be activated."; } leaf area-id { type yang:dotted-quad; mandatory true; description "Area ID."; reference "RFC 4577: OSPF as the Provider/Customer Edge Protocol for BGP/MPLS IP Virtual Private Networks (VPNs), Section 4.2.3 RFC 6565: OSPFv3 as a Provider Edge to Customer Edge (PE-CE) Routing Protocol, Section 4.2"; } leaf metric { type uint16; default "1"; description "Metric of the AC. It is used in the routing state calculation and path selection."; } } container isis { when "derived-from-or-self(../type, " + "'vpn-common:isis-routing')" { description "Only applies when the protocol is IS-IS."; } description "Configuration specific to IS-IS."; leaf address-family { type identityref { base vpn-common:address-family; } description "Indicates whether IPv4, IPv6, or both are to be activated."; } leaf area-address { type area-address; mandatory true; description "Area address."; } } container rip { when "derived-from-or-self(../type, " + "'vpn-common:rip-routing')" { description "Only applies when the protocol is RIP. For IPv4, the model assumes that RIP version 2 is used."; } description "Configuration specific to RIP routing."; leaf address-family { type identityref { base vpn-common:address-family; } description "Indicates whether IPv4, IPv6, or both address families are to be activated."; } } container vrrp { when "derived-from-or-self(../type, " + "'vpn-common:vrrp-routing')" { description "Only applies when the protocol is the Virtual Router Redundancy Protocol (VRRP)."; } description "Configuration specific to VRRP."; reference "RFC 5798: Virtual Router Redundancy Protocol (VRRP) Version 3 for IPv4 and IPv6"; leaf address-family { type identityref { base vpn-common:address-family; } description "Indicates whether IPv4, IPv6, or both address families are to be enabled."; } } } } grouping encryption-choice { description "Container for the encryption profile."; choice profile { description "Choice for the encryption profile."; case provider-profile { leaf provider-profile { type ac-svc:encryption-profile-reference; description "Reference to a provider encryption profile."; } } case customer-profile { leaf customer-key-chain { type key-chain:key-chain-ref; description "Customer-supplied key chain."; } } } } grouping bgp-authentication { description "Grouping for BGP authentication parameters."; container authentication { description "Container for BGP authentication parameters."; leaf enable { type boolean; default "false"; description "Enables or disables authentication."; } container keying-material { when "../enable = 'true'"; description "Container for describing how a BGP routing session is to be secured between a PE and a CE."; choice option { description "Choice of authentication options."; case ao { description "Uses the TCP Authentication Option (TCP-AO)."; reference "RFC 5925: The TCP Authentication Option"; leaf enable-ao { type boolean; description "Enables the TCP-AO."; } leaf ao-keychain { type key-chain:key-chain-ref; description "Reference to the TCP-AO key chain."; reference "RFC 8177: YANG Data Model for Key Chains"; } } case md5 { description "Uses MD5 to secure the session."; reference "RFC 4364: BGP/MPLS IP Virtual Private Networks (VPNs), Section 13.2"; leaf md5-keychain { type key-chain:key-chain-ref; description "Reference to the MD5 key chain."; reference "RFC 8177: YANG Data Model for Key Chains"; } } case explicit { leaf key-id { type uint32; description "Key identifier."; } leaf key { type string; description "BGP authentication key. This model only supports the subset of keys that are representable as ASCII strings."; } leaf crypto-algorithm { type identityref { base key-chain:crypto-algorithm; } description "Indicates the cryptographic algorithm associated with the key."; } } } } } } grouping ospf-authentication { description "Authentication configuration."; container authentication { description "Container for OSPF authentication parameters."; leaf enable { type boolean; default "false"; description "Enables or disables authentication."; } container keying-material { when "../enable = 'true'"; description "Container for describing how an OSPF session is to be secured for this AC."; choice option { description "Options for OSPF authentication."; case auth-key-chain { leaf key-chain { type key-chain:key-chain-ref; description "Name of the key chain."; } } case auth-key-explicit { leaf key-id { type uint32; description "Key identifier."; } leaf key { type string; description "OSPF authentication key. This model only supports the subset of keys that are representable as ASCII strings."; } leaf crypto-algorithm { type identityref { base key-chain:crypto-algorithm; } description "Indicates the cryptographic algorithm associated with the key."; } } } } } } grouping isis-authentication { description "IS-IS authentication configuration."; container authentication { description "Container for IS-IS authentication parameters."; leaf enable { type boolean; default "false"; description "Enables or disables authentication."; } container keying-material { when "../enable = 'true'"; description "Container for describing how an IS-IS session for an AC."; choice option { description "Options for IS-IS authentication."; case auth-key-chain { leaf key-chain { type key-chain:key-chain-ref; description "Name of the key chain."; } } case auth-key-explicit { leaf key-id { type uint32; description "Key identifier."; } leaf key { type string; description "IS-IS authentication key. This model only supports the subset of keys that are representable as ASCII strings."; } leaf crypto-algorithm { type identityref { base key-chain:crypto-algorithm; } description "Indicates the cryptographic algorithm associated with the key."; } } } } } } grouping rip-authentication { description "RIP authentication configuration."; container authentication { description "Container for RIP authentication parameters."; leaf enable { type boolean; default "false"; description "Enables or disables authentication."; } container keying-material { when "../enable = 'true'"; description "Container for describing how a RIP session is to be secured between a CE and a PE."; choice option { description "Specifies the authentication scheme."; case auth-key-chain { leaf key-chain { type key-chain:key-chain-ref; description "Name of the key chain."; } } case auth-key-explicit { leaf key { type string; description "RIP authentication key. This model only supports the subset of keys that are representable as ASCII strings."; } leaf crypto-algorithm { type identityref { base key-chain:crypto-algorithm; } description "Indicates the cryptographic algorithm associated with the key."; } } } } } } grouping ac-security { description "AC-specific security parameters."; container encryption { if-feature "vpn-common:encryption"; description "Container for AC security encryption."; leaf enabled { type boolean; default "false"; description "If set to 'true', traffic encryption on the connection is required. Otherwise, it is disabled."; } leaf layer { when "../enabled = 'true'" { description "Included only when encryption is enabled."; } type enumeration { enum layer2 { description "Encryption occurs at Layer 2."; } enum layer3 { description "Encryption occurs at Layer 3. For example, IPsec may be used when a customer requests Layer 3 encryption."; } } description "Indicates the layer on which encryption is applied."; } } container encryption-profile { when "../encryption/enabled = 'true'" { description "Indicates the layer on which encryption is enabled."; } description "Container for the encryption profile."; uses encryption-choice; } } grouping routing { description "Defines routing protocols."; list routing-protocol { key "id"; description "List of routing protocols used on the AC."; leaf id { type string; description "Unique identifier for the routing protocol."; } leaf type { type identityref { base vpn-common:routing-protocol-type; } description "Type of routing protocol."; } list routing-profiles { key "id"; description "Routing profiles."; leaf id { type routing-profile-reference; description "Reference to the routing profile to be used."; } leaf type { type identityref { base vpn-common:ie-type; } description "Import, export, or both."; } } container static { when "derived-from-or-self(../type, " + "'vpn-common:static-routing')" { description "Only applies when the protocol is a static routing protocol."; } description "Configuration specific to static routing."; container cascaded-lan-prefixes { description "LAN prefixes from the customer."; list ipv4-lan-prefixes { if-feature "vpn-common:ipv4"; key "lan next-hop"; description "List of LAN prefixes for the site."; leaf lan { type inet:ipv4-prefix; description "LAN prefixes."; } leaf lan-tag { type string; description "Internal tag to be used in VPN policies."; } leaf next-hop { type union { type inet:ip-address; type predefined-next-hop; } description "The next hop that is to be used for the static route. This may be specified as an IP address or a predefined next-hop type (e.g., 'discard' or 'local-link')."; } leaf metric { type uint32; description "Indicates the metric associated with the static route."; } uses vpn-common:service-status; } list ipv6-lan-prefixes { if-feature "vpn-common:ipv6"; key "lan next-hop"; description "List of LAN prefixes for the site."; leaf lan { type inet:ipv6-prefix; description "LAN prefixes."; } leaf lan-tag { type string; description "Internal tag to be used in VPN policies."; } leaf next-hop { type union { type inet:ip-address; type predefined-next-hop; } description "The next hop that is to be used for the static route. This may be specified as an IP address or a predefined next-hop type (e.g., 'discard' or 'local-link')."; } leaf metric { type uint32; description "Indicates the metric associated with the static route."; } uses vpn-common:service-status; } } } container bgp { when "derived-from-or-self(../type, " + "'vpn-common:bgp-routing')" { description "Only applies when the protocol is BGP."; } description "Configuration specific to BGP."; container peer-groups { description "Configuration for BGP peer-groups"; list peer-group { key "name"; description "List of BGP peer-groups configured on the local system - uniquely identified by peer-group name"; leaf name { type string; description "Name of the BGP peer-group."; } leaf local-address { type inet:ip-address; config false; description "The local IP address that will be used to establish the BGP session."; } leaf local-as { type inet:as-number; config false; description "Indicates a local AS Number (ASN), if an ASN distinct from the ASN configured at the peer group level is needed."; } leaf peer-as { type inet:as-number; description "Indicates the customer's ASN when the customer requests BGP routing."; } leaf address-family { type identityref { base vpn-common:address-family; } description "This node contains the address families to be activated. 'dual-stack' means that both IPv4 and IPv6 will be activated."; } uses bgp-authentication; } } list neighbor { key "id"; description "List of BGP neighbors."; leaf id { type string; description "A neighbor identifier."; } leaf remote-address { type inet:ip-address; description "The remote IP address of this entry's BGP peer. If this leaf is not present, this means that the primary customer IP address is used as remote IP address."; } leaf local-address { type inet:ip-address; config false; description "The local IP address that will be used to establish the BGP session."; } leaf peer-group { type leafref { path "../../peer-groups/peer-group/name"; } description "The peer-group with which this neighbor is associated."; } leaf local-as { type inet:as-number; config false; description "Indicates a local ASN."; } leaf peer-as { type inet:as-number; description "Indicates the customer's ASN when the customer requests BGP routing."; } leaf address-family { type identityref { base vpn-common:address-family; } description "This node contains the address families to be activated. 'dual-stack' means that both IPv4 and IPv6 will be activated."; } uses bgp-authentication; uses vpn-common:service-status; } } container ospf { when "derived-from-or-self(../type, " + "'vpn-common:ospf-routing')" { description "Only applies when the protocol is OSPF."; } description "Configuration specific to OSPF."; leaf address-family { type identityref { base vpn-common:address-family; } description "Indicates whether IPv4, IPv6, or both are to be activated."; } leaf area-id { type yang:dotted-quad; mandatory true; description "Area ID."; reference "RFC 4577: OSPF as the Provider/Customer Edge Protocol for BGP/MPLS IP Virtual Private Networks (VPNs), Section 4.2.3 RFC 6565: OSPFv3 as a Provider Edge to Customer Edge (PE-CE) Routing Protocol, Section 4.2"; } leaf metric { type uint16; default "1"; description "Metric of the ACE. It is used in the routing state calculation and path selection."; } uses ospf-authentication; uses vpn-common:service-status; } container isis { when "derived-from-or-self(../type, " + "'vpn-common:isis-routing')" { description "Only applies when the protocol is IS-IS."; } description "Configuration specific to IS-IS."; leaf address-family { type identityref { base vpn-common:address-family; } description "Indicates whether IPv4, IPv6, or both are to be activated."; } leaf area-address { type area-address; mandatory true; description "Area address."; } uses isis-authentication; uses vpn-common:service-status; } container rip { when "derived-from-or-self(../type, " + "'vpn-common:rip-routing')" { description "Only applies when the protocol is RIP. For IPv4, the model assumes that RIP version 2 is used."; } description "Configuration specific to RIP routing."; leaf address-family { type identityref { base vpn-common:address-family; } description "Indicates whether IPv4, IPv6, or both address families are to be activated."; } uses rip-authentication; uses vpn-common:service-status; } container vrrp { when "derived-from-or-self(../type, " + "'vpn-common:vrrp-routing')" { description "Only applies when the protocol is the Virtual Router Redundancy Protocol (VRRP)."; } description "Configuration specific to VRRP."; reference "RFC 5798: Virtual Router Redundancy Protocol (VRRP) Version 3 for IPv4 and IPv6"; leaf address-family { type identityref { base vpn-common:address-family; } description "Indicates whether IPv4, IPv6, or both address families are to be enabled."; } uses vpn-common:service-status; } } } grouping ac { description "Grouping for an attachment circuit."; leaf name { type string; description "A name of the AC. Data models that need to reference an attachment circuits should use attachment-circuit-reference."; } // Layer 2 container l2-connection { description "Defines Layer 2 protocols and parameters that are required to enable AC connectivity."; uses l2-connection; } // Layer 3 container ip-connection { description "Defines IP connection parameters."; uses ip-connection; } // Routing container routing-protocols { description "Defines routing protocols."; uses routing; } // OAM container oam { description "Defines the Operations, Administration, and Maintenance (OAM) mechanisms used. BFD is set as a fault detection mechanism, but other mechanisms can be defined in the future."; container bfd { if-feature "vpn-common:bfd"; description "Container for BFD."; leaf holdtime { type uint32; units "milliseconds"; description "Expected BFD holdtime. The customer may impose some fixed values for the holdtime period if the provider allows the customer to use this function. If the provider doesn't allow the customer to use this function, fixed values will not be set."; reference "RFC 5880: Bidirectional Forwarding Detection (BFD), Section 6.8.18"; } uses vpn-common:service-status; } } // Security container security { description "AC-specific security parameters."; uses ac-security; } } grouping ac-profile { description "Grouping for an attachment circuit."; leaf id { type string; description "An identifier of the AC."; } // Layer 2 container l2-connection { description "Defines Layer 2 protocols and parameters that are required to enable AC connectivity."; uses l2-connection-profile; } // Layer 3 container ip-connection { description "Defines IP connection parameters."; uses ip-connection-global-profile; } // Routing container routing-protocols { description "Defines routing protocols."; uses routing-profile; } // OAM container oam { description "Defines the OAM mechanisms used. BFD is set as a fault detection mechanism, but other mechanisms can be defined in the future."; container bfd { if-feature "vpn-common:bfd"; description "Container for BFD."; leaf holdtime { type uint32; units "milliseconds"; description "Expected BFD holdtime. The customer may impose some fixed values for the holdtime period if the provider allows the customer to use this function. If the provider doesn't allow the customer to use this function, fixed values will not be set."; reference "RFC 5880: Bidirectional Forwarding Detection (BFD), Section 6.8.18"; } } } // Security container security { description "AC-specific security parameters."; uses ac-security; } } grouping op-instructions { description "Scheduling instructions."; leaf requested-start { type yang:date-and-time; description "Indicates the requested date and time when the AC is expected to be active."; } leaf requested-stop { type yang:date-and-time; description "Indicates the requested date and time when the AC is expected to be disabled."; } leaf actual-start { type yang:date-and-time; config false; description "Indciates the actual date and time when the AC actually was enabled."; } leaf actual-stop { type yang:date-and-time; config false; description "Indciates the actual date and time when the AC actually was disabled."; } } container specific-provisioning-profiles { description "Contains a set of valid profiles to reference for an AC."; uses vpn-common:vpn-profile-cfg; } container service-provisioning-profiles { description "Contains a set of valid profiles to reference for an AC."; list service-profile-identifier { key "id"; description "List of generic service profile identifiers."; leaf id { type string; description "Identification of the service profile to be used. the profile only has significance within the service provider's administrative domain."; } } } container bearers { description "Main container for the bearers."; list bearer { key "id"; description "Maintains a list of bearers."; leaf id { type string; description "An identifier of the bearer."; } leaf description { type string; description "A description of this bearer."; } container customer-device { description "Identification of the customer device that terminates the bearer."; leaf device-id { type string; description "Identifier for the device."; } container location { description "Location of the node."; leaf address { type string; description "Address (number and street) of the site."; } leaf postal-code { type string; description "Postal code of the site."; } leaf state { type string; description "State of the site. This leaf can also be used to describe a region for a country that does not have states."; } leaf city { type string; description "City of the site."; } leaf country-code { type string { pattern '[A-Z]{2}'; } description "Country of the site. Expressed as ISO ALPHA-2 code."; } } } leaf requested-type { type identityref { base bearer-type; } description "Type of the requested bearer (e.g., Ethernet, or wireless)"; } leaf bearer-reference { if-feature "vpn-common:bearer-reference"; type string; config false; description "This is an internal reference for the service provider to identify the bearer associated with this AC."; } uses op-instructions; } } container attachment-circuits { description "Main container for the attachment circuits."; list ac-global-profile { key "id"; description "Maintains a list of AC profiles."; uses ac-profile; } list ac-node-group { key "id"; description "Maintains a list of per-node AC profiles."; leaf id { type string; description "An identifier of the AC group."; } uses ac; } container placement-constraints { description "Diversity constraint type."; uses vpn-common:placement-constraints; } list ac { key "name"; description "Global provisioning of attachment circuits."; leaf customer-name { type string; description "Indicates the name of the customer that requested this AC."; } leaf description { type string; description "Associates a description with an AC."; } uses op-instructions; leaf-list peer-sap-id { type string; description "One or more peer SAPs can be indicated."; } leaf-list ac-global-profile { type ac-global-profile-reference; description "A reference to an AC profile."; } leaf-list ac-node-profile { type ac-node-group-reference; description "A reference to a per-node AC profile."; } list group { key "group-id"; description "List of group-ids."; leaf group-id { type string; description "Indicates the group-id to which the network access belongs to."; } leaf precedence { type identityref { base precedence-type; } description "Defines service redundancy in transport network."; } } uses ac; } } } ]]>

Augmentations to Existing Service-Specific Models to Bind a Service to an AC

Tree Structure ACs created using the "ietf-ac-svc" module can be referenced in other modules (e.g., L2SM, L3SM, L2NM, L3NM, and Slicing). Some augmentations are required to that aim as shown in .

Augmenting Other Service-Specific Modules

Module WG List: Editor: Mohamed Boucadair Author: Richard Roberts "; description "This YANG module defines a generic YANG model for the configuration of attachment circuits. Copyright (c) 2023 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Revised BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info). This version of this YANG module is part of RFC xxx; see the RFC itself for full legal notices."; revision 2022-11-30 { description "Initial revision."; reference "RFC xxxx: A YANG Network Data Model for Attachment Circuits"; } grouping ac-glue { description "A set of AC-related data."; leaf-list ac-ref { type ac-svc:attachment-circuit-reference; description "A reference to the AC as exposed at the service that was provisionned using the AC module."; } } augment "/l3vpn-svc:l3vpn-svc" + "/l3vpn-svc:sites/l3vpn-svc:site" + "/l3vpn-svc:site-network-accesses/l3vpn-svc:site-network-access" { description "Augments VPN network access with AC provisioning details."; uses ac-glue; } augment "/l2vpn-svc:l2vpn-svc" + "/l2vpn-svc:sites/l2vpn-svc:site" + "/l2vpn-svc:site-network-accesses/l2vpn-svc:site-network-access" { description "Augments VPN network access with AC provisioning details."; uses ac-glue; } augment "/l3nm:l3vpn-ntw/l3nm:vpn-services/l3nm:vpn-service" + "/l3nm:vpn-nodes/l3nm:vpn-node" + "/l3nm:vpn-network-accesses/l3nm:vpn-network-access" { description "Augments VPN network access with AC provisioning details."; uses ac-glue; } augment "/l2nm:l2vpn-ntw/l2nm:vpn-services/l2nm:vpn-service" + "/l2nm:vpn-nodes/l2nm:vpn-node" + "/l2nm:vpn-network-accesses/l2nm:vpn-network-access" { description "Augments VPN network access with AC provisioning details."; uses ac-glue; } augment "/ietf-nss:network-slice-services/ietf-nss:slice-service" + "/ietf-nss:sdps/ietf-nss:sdp" { description "Augments VPN network access with AC provisioning details."; uses ac-glue; } } ]]>

Security Considerations The YANG modules specified in this document define schema for data that is designed to be accessed via network management protocols such as NETCONF or RESTCONF . The lowest NETCONF layer is the secure transport layer, and the mandatory-to-implement secure transport is Secure Shell (SSH) . The lowest RESTCONF layer is HTTPS, and the mandatory-to-implement secure transport is TLS . The Network Configuration Access Control Model (NACM) provides the means to restrict access for particular NETCONF or RESTCONF users to a preconfigured subset of all available NETCONF or RESTCONF protocol operations and content. There are a number of data nodes defined in these YANG modules that are writable/creatable/deletable (i.e., config true, which is the default). These data nodes may be considered sensitive or vulnerable in some network environments. Write operations (e.g., edit-config) and delete operations to these data nodes without proper protection or authentication can have a negative effect on network operations. These are the subtrees and data nodes and their sensitivity/ vulnerability in the "ietf-ac-svc" module:

Some of the readable data nodes in these YANG module may be considered sensitive or vulnerable in some network environments. It is thus important to control read access (e.g., via get, get-config, or notification) to these data nodes. These are the subtrees and data nodes and their sensitivity/vulnerability in the "ietf-ac-svc" module:

Several data nodes ('bgp', 'ospf', 'isis', and 'rip') rely upon for authentication purposes. As such, the AC service module inherits the security considerations discussed in Section 5 of . Also, these data nodes support supplying explicit keys as strings in ASCII format. The use of keys in hexadecimal string format would afford greater key entropy with the same number of key- string octets. However, such a format is not included in this version of the AC service model, because it is not supported by the underlying device modules (e.g., ).

IANA Considerations IANA is requested to register the following URIs in the "ns" subregistry within the "IETF XML Registry" : IANA is requested to register the following YANG module in the "YANG Module Names" subregistry within the "YANG Parameters" registry.

References Normative References Information technology - Telecommunications and information exchange between systems - Intermediate System to Intermediate System intra-domain routeing information exchange protocol for use in conjunction with the protocol for providing the connectionless-mode network service (ISO8473) ISO BGP/MPLS IP Virtual Private Networks (VPNs) This document describes a method by which a Service Provider may use an IP backbone to provide IP Virtual Private Networks (VPNs) for its customers. This method uses a "peer model", in which the customers' edge routers (CE routers) send their routes to the Service Provider's edge routers (PE routers); there is no "overlay" visible to the customer's routing algorithm, and CE routers at different sites do not peer with each other. Data packets are tunneled through the backbone, so that the core routers do not need to know the VPN routes. [STANDARDS-TRACK] A YANG Network Model for Service Attachment Points (SAPs) Orange Telefonica Nokia Huawei Nokia This document defines a YANG data model for representing an abstract view of the provider network topology that contains the points from which its services can be attached (e.g., basic connectivity, VPN, network slices). Also, the model can be used to retrieve the points where the services are actually being delivered to customers (including peer networks). This document augments the 'ietf-network' data model by adding the concept of Service Attachment Points (SAPs). The SAPs are the network reference points to which network services, such as Layer 3 Virtual Private Network (L3VPN) or Layer 2 Virtual Private Network (L2VPN), can be attached. One or multiple services can be bound to the same SAP. Both User-Network Interface (UNI) and Network-to- Network Interface (NNI) are supported in the SAP data model. Network Management Datastore Architecture (NMDA) Datastores are a fundamental concept binding the data models written in the YANG data modeling language to network management protocols such as the Network Configuration Protocol (NETCONF) and RESTCONF. This document defines an architectural framework for datastores based on the experience gained with the initial simpler model, addressing requirements that were not well supported in the initial model. This document updates RFC 7950. Key words for use in RFCs to Indicate Requirement Levels In many standards track documents several words are used to signify the requirements in the specification. These words are often capitalized. This document defines these words as they should be interpreted in IETF documents. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements. Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words RFC 2119 specifies common key words that may be used in protocol specifications. This document aims to reduce the ambiguity by clarifying that only UPPERCASE usage of the key words have the defined special meanings. A Common YANG Data Model for Layer 2 and Layer 3 VPNs This document defines a common YANG module that is meant to be reused by various VPN-related modules such as Layer 3 VPN and Layer 2 VPN network models. Bidirectional Forwarding Detection (BFD) This document describes a protocol intended to detect faults in the bidirectional path between two forwarding engines, including interfaces, data link(s), and to the extent possible the forwarding engines themselves, with potentially very low latency. It operates independently of media, data protocols, and routing protocols. [STANDARDS-TRACK] A Border Gateway Protocol 4 (BGP-4) This document discusses the Border Gateway Protocol (BGP), which is an inter-Autonomous System routing protocol. The primary function of a BGP speaking system is to exchange network reachability information with other BGP systems. This network reachability information includes information on the list of Autonomous Systems (ASes) that reachability information traverses. This information is sufficient for constructing a graph of AS connectivity for this reachability from which routing loops may be pruned, and, at the AS level, some policy decisions may be enforced. BGP-4 provides a set of mechanisms for supporting Classless Inter-Domain Routing (CIDR). These mechanisms include support for advertising a set of destinations as an IP prefix, and eliminating the concept of network "class" within BGP. BGP-4 also introduces mechanisms that allow aggregation of routes, including aggregation of AS paths. This document obsoletes RFC 1771. [STANDARDS-TRACK] OSPF as the Provider/Customer Edge Protocol for BGP/MPLS IP Virtual Private Networks (VPNs) Many Service Providers offer Virtual Private Network (VPN) services to their customers, using a technique in which customer edge routers (CE routers) are routing peers of provider edge routers (PE routers). The Border Gateway Protocol (BGP) is used to distribute the customer's routes across the provider's IP backbone network, and Multiprotocol Label Switching (MPLS) is used to tunnel customer packets across the provider's backbone. This is known as a "BGP/MPLS IP VPN". The base specification for BGP/MPLS IP VPNs presumes that the routing protocol on the interface between a PE router and a CE router is BGP. This document extends that specification by allowing the routing protocol on the PE/CE interface to be the Open Shortest Path First (OSPF) protocol. This document updates RFC 4364. [STANDARDS-TRACK] OSPFv3 as a Provider Edge to Customer Edge (PE-CE) Routing Protocol Many Service Providers (SPs) offer Virtual Private Network (VPN) services to their customers using a technique in which Customer Edge (CE) routers are routing peers of Provider Edge (PE) routers. The Border Gateway Protocol (BGP) is used to distribute the customer's routes across the provider's IP backbone network, and Multiprotocol Label Switching (MPLS) is used to tunnel customer packets across the provider's backbone. Support currently exists for both IPv4 and IPv6 VPNs; however, only Open Shortest Path First version 2 (OSPFv2) as PE-CE protocol is specified. This document extends those specifications to support OSPF version 3 (OSPFv3) as a PE-CE routing protocol. The OSPFv3 PE-CE functionality is identical to that of OSPFv2 except for the differences described in this document. [STANDARDS-TRACK] Use of OSI IS-IS for routing in TCP/IP and dual environments This memo specifies an integrated routing protocol, based on the OSI Intra-Domain IS-IS Routing Protocol, which may be used as an interior gateway protocol (IGP) to support TCP/IP as well as OSI. This allows a single routing protocol to be used to support pure IP environments, pure OSI environments, and dual environments. This specification was developed by the IS-IS working group of the Internet Engineering Task Force. [STANDARDS-TRACK] Routing IPv6 with IS-IS This document specifies a method for exchanging IPv6 routing information using the IS-IS routing protocol. The described method utilizes two new TLVs: a reachability TLV and an interface address TLV to distribute the necessary IPv6 information throughout a routing domain. Using this method, one can route IPv6 along with IPv4 and OSI using a single intra-domain routing protocol. [STANDARDS-TRACK] RIP Version 2 This document specifies an extension of the Routing Information Protocol (RIP) to expand the amount of useful information carried in RIP messages and to add a measure of security. [STANDARDS-TRACK] Virtual Router Redundancy Protocol (VRRP) Version 3 for IPv4 and IPv6 This memo defines the Virtual Router Redundancy Protocol (VRRP) for IPv4 and IPv6. It is version three (3) of the protocol, and it is based on VRRP (version 2) for IPv4 that is defined in RFC 3768 and in "Virtual Router Redundancy Protocol for IPv6". VRRP specifies an election protocol that dynamically assigns responsibility for a virtual router to one of the VRRP routers on a LAN. The VRRP router controlling the IPv4 or IPv6 address(es) associated with a virtual router is called the Master, and it forwards packets sent to these IPv4 or IPv6 addresses. VRRP Master routers are configured with virtual IPv4 or IPv6 addresses, and VRRP Backup routers infer the address family of the virtual addresses being carried based on the transport protocol. Within a VRRP router, the virtual routers in each of the IPv4 and IPv6 address families are a domain unto themselves and do not overlap. The election process provides dynamic failover in the forwarding responsibility should the Master become unavailable. For IPv4, the advantage gained from using VRRP is a higher-availability default path without requiring configuration of dynamic routing or router discovery protocols on every end-host. For IPv6, the advantage gained from using VRRP for IPv6 is a quicker switchover to Backup routers than can be obtained with standard IPv6 Neighbor Discovery mechanisms. [STANDARDS-TRACK] RIPng for IPv6 This document specifies a routing protocol for an IPv6 internet. It is based on protocols and algorithms currently in wide use in the IPv4 Internet [STANDARDS-TRACK] A YANG Network Data Model for Layer 3 VPNs As a complement to the Layer 3 Virtual Private Network Service Model (L3SM), which is used for communication between customers and service providers, this document defines an L3VPN Network Model (L3NM) that can be used for the provisioning of Layer 3 Virtual Private Network (L3VPN) services within a service provider network. The model provides a network-centric view of L3VPN services. The L3NM is meant to be used by a network controller to derive the configuration information that will be sent to relevant network devices. The model can also facilitate communication between a service orchestrator and a network controller/orchestrator. YANG Data Model for Key Chains This document describes the key chain YANG data model. Key chains are commonly used for routing protocol authentication and other applications requiring symmetric keys. A key chain is a list containing one or more elements containing a Key ID, key string, send/accept lifetimes, and the associated authentication or encryption algorithm. By properly overlapping the send and accept lifetimes of multiple key chain elements, key strings and algorithms may be gracefully updated. By representing them in a YANG data model, key distribution can be automated. The TCP Authentication Option This document specifies the TCP Authentication Option (TCP-AO), which obsoletes the TCP MD5 Signature option of RFC 2385 (TCP MD5). TCP-AO specifies the use of stronger Message Authentication Codes (MACs), protects against replays even for long-lived TCP connections, and provides more details on the association of security with TCP connections than TCP MD5. TCP-AO is compatible with either a static Master Key Tuple (MKT) configuration or an external, out-of-band MKT management mechanism; in either case, TCP-AO also protects connections when using the same MKT across repeated instances of a connection, using traffic keys derived from the MKT, and coordinates MKT changes between endpoints. The result is intended to support current infrastructure uses of TCP MD5, such as to protect long-lived connections (as used, e.g., in BGP and LDP), and to support a larger set of MACs with minimal other system and operational changes. TCP-AO uses a different option identifier than TCP MD5, even though TCP-AO and TCP MD5 are never permitted to be used simultaneously. TCP-AO supports IPv6, and is fully compatible with the proposed requirements for the replacement of TCP MD5. [STANDARDS-TRACK] Common YANG Data Types This document introduces a collection of common data types to be used with the YANG data modeling language. This document obsoletes RFC 6021. Network Configuration Protocol (NETCONF) The Network Configuration Protocol (NETCONF) defined in this document provides mechanisms to install, manipulate, and delete the configuration of network devices. It uses an Extensible Markup Language (XML)-based data encoding for the configuration data as well as the protocol messages. The NETCONF protocol operations are realized as remote procedure calls (RPCs). This document obsoletes RFC 4741. [STANDARDS-TRACK] RESTCONF Protocol This document describes an HTTP-based protocol that provides a programmatic interface for accessing data defined in YANG, using the datastore concepts defined in the Network Configuration Protocol (NETCONF). Using the NETCONF Protocol over Secure Shell (SSH) This document describes a method for invoking and running the Network Configuration Protocol (NETCONF) within a Secure Shell (SSH) session as an SSH subsystem. This document obsoletes RFC 4742. [STANDARDS-TRACK] The Transport Layer Security (TLS) Protocol Version 1.3 This document specifies version 1.3 of the Transport Layer Security (TLS) protocol. TLS allows client/server applications to communicate over the Internet in a way that is designed to prevent eavesdropping, tampering, and message forgery. This document updates RFCs 5705 and 6066, and obsoletes RFCs 5077, 5246, and 6961. This document also specifies new requirements for TLS 1.2 implementations. Network Configuration Access Control Model The standardization of network configuration interfaces for use with the Network Configuration Protocol (NETCONF) or the RESTCONF protocol requires a structured and secure operating environment that promotes human usability and multi-vendor interoperability. There is a need for standard mechanisms to restrict NETCONF or RESTCONF protocol access for particular users to a preconfigured subset of all available NETCONF or RESTCONF protocol operations and content. This document defines such an access control model. This document obsoletes RFC 6536. The IETF XML Registry This document describes an IANA maintained registry for IETF standards which use Extensible Markup Language (XML) related items such as Namespaces, Document Type Declarations (DTDs), Schemas, and Resource Description Framework (RDF) Schemas. YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF) YANG is a data modeling language used to model configuration and state data manipulated by the Network Configuration Protocol (NETCONF), NETCONF remote procedure calls, and NETCONF notifications. [STANDARDS-TRACK] Informative References IPv4 Address Blocks Reserved for Documentation Three IPv4 unicast address blocks are reserved for use in examples in specifications and other documents. This document describes the use of these blocks. This document is not an Internet Standards Track specification; it is published for informational purposes. IPv6 Address Prefix Reserved for Documentation To reduce the likelihood of conflict and confusion when relating documented examples to deployed systems, an IPv6 unicast address prefix is reserved for use in examples in RFCs, books, documentation, and the like. Since site-local and link-local unicast addresses have special meaning in IPv6, these addresses cannot be used in many example situations. The document describes the use of the IPv6 address prefix 2001:DB8::/32 as a reserved prefix for use in documentation. This memo provides information for the Internet community. Autonomous System (AS) Number Reservation for Documentation Use To reduce the likelihood of conflict and confusion when relating documented examples to deployed systems, two blocks of Autonomous System numbers (ASNs) are reserved for use in examples in RFCs, books, documentation, and the like. This document describes the reservation of two blocks of ASNs as reserved numbers for use in documentation. This memo provides information for the Internet community. A Framework for Automating Service and Network Management with YANG Data models provide a programmatic approach to represent services and networks. Concretely, they can be used to derive configuration information for network and service components, and state information that will be monitored and tracked. Data models can be used during the service and network management life cycle (e.g., service instantiation, service provisioning, service optimization, service monitoring, service diagnosing, and service assurance). Data models are also instrumental in the automation of network management, and they can provide closed-loop control for adaptive and deterministic service creation, delivery, and maintenance. This document describes a framework for service and network management automation that takes advantage of YANG modeling technologies. This framework is drawn from a network operator perspective irrespective of the origin of a data model; thus, it can accommodate YANG modules that are developed outside the IETF. A Network YANG Data Model for Attachment Circuits Orange Juniper Telefonica Nokia Huawei Technologies This document specifies a network model for attachment circuits. The model can be used for the provisioning of attachment circuits prior or during service provisioning (e.g., Network Slice Service). The companion service model is specified in [I-D.boro-opsawg-teas-attachment-circuit]. The module augments the SAP model with the detailed information for the provisioning of attachment circuits in Provider Edges (PEs). A YANG Data Model for Routing Management (NMDA Version) This document specifies three YANG modules and one submodule. Together, they form the core routing data model that serves as a framework for configuring and managing a routing subsystem. It is expected that these modules will be augmented by additional YANG modules defining data models for control-plane protocols, route filters, and other functions. The core routing data model provides common building blocks for such extensions -- routes, Routing Information Bases (RIBs), and control-plane protocols. The YANG modules in this document conform to the Network Management Datastore Architecture (NMDA). This document obsoletes RFC 8022. BGP YANG Model for Service Provider Networks Kloud Services Arrcus Huawei Juniper Networks This document defines a YANG data model for configuring and managing BGP, including protocol, policy, and operational aspects, such as RIB, based on data center, carrier, and content provider operational requirements. A YANG Data Model for Layer 2 Virtual Private Network (L2VPN) Service Delivery This document defines a YANG data model that can be used to configure a Layer 2 provider-provisioned VPN service. It is up to a management system to take this as an input and generate specific configuration models to configure the different network elements to deliver the service. How this configuration of network elements is done is out of scope for this document. The YANG data model defined in this document includes support for point-to-point Virtual Private Wire Services (VPWSs) and multipoint Virtual Private LAN Services (VPLSs) that use Pseudowires signaled using the Label Distribution Protocol (LDP) and the Border Gateway Protocol (BGP) as described in RFCs 4761 and 6624. The YANG data model defined in this document conforms to the Network Management Datastore Architecture defined in RFC 8342. YANG Data Model for L3VPN Service Delivery This document defines a YANG data model that can be used for communication between customers and network operators and to deliver a Layer 3 provider-provisioned VPN service. This document is limited to BGP PE-based VPNs as described in RFCs 4026, 4110, and 4364. This model is intended to be instantiated at the management system to deliver the overall service. It is not a configuration model to be used directly on network elements. This model provides an abstracted view of the Layer 3 IP VPN service configuration components. It will be up to the management system to take this model as input and use specific configuration models to configure the different network elements to deliver the service. How the configuration of network elements is done is out of scope for this document. This document obsoletes RFC 8049; it replaces the unimplementable module in that RFC with a new module with the same name that is not backward compatible. The changes are a series of small fixes to the YANG module and some clarifications to the text. YANG Tree Diagrams This document captures the current syntax used in YANG module tree diagrams. The purpose of this document is to provide a single location for this definition. This syntax may be updated from time to time based on the evolution of the YANG language. Service Function Chaining (SFC) Architecture This document describes an architecture for the specification, creation, and ongoing maintenance of Service Function Chains (SFCs) in a network. It includes architectural concepts, principles, and components used in the construction of composite services through deployment of SFCs, with a focus on those to be standardized in the IETF. This document does not propose solutions, protocols, or extensions to existing protocols. IETF Network Slice Service YANG Model Huawei Technologies Huawei Technologies Ciena Cisco Systems, Inc China Mobile Cisco Systems, Inc This document defines a YANG model for the IETF Network Slice service. The model can be used by an IETF Network Slice customer to manage IETF Network Slices. Updated Security Considerations for the MD5 Message-Digest and the HMAC-MD5 Algorithms This document updates the security considerations for the MD5 message digest algorithm. It also updates the security considerations for HMAC-MD5. This document is not an Internet Standards Track specification; it is published for informational purposes. Analysis of BGP, LDP, PCEP, and MSDP Issues According to the Keying and Authentication for Routing Protocols (KARP) Design Guide This document analyzes TCP-based routing protocols, the Border Gateway Protocol (BGP), the Label Distribution Protocol (LDP), the Path Computation Element Communication Protocol (PCEP), and the Multicast Source Distribution Protocol (MSDP), according to guidelines set forth in Section 4.2 of "Keying and Authentication for Routing Protocols Design Guidelines", RFC 6518. Policy Quality of Service (QoS) Information Model This document presents an object-oriented information model for representing Quality of Service (QoS) network management policies. This document is based on the IETF Policy Core Information Model and its extensions. It defines an information model for QoS enforcement for differentiated and integrated services using policy. It is important to note that this document defines an information model, which by definition is independent of any particular data storage mechanism and access protocol. A YANG Data Model for the Routing Information Protocol (RIP) This document describes a data model for the management of the Routing Information Protocol (RIP). Both RIP version 2 and RIPng are covered. The data model includes definitions for configuration, operational state, and Remote Procedure Calls (RPCs). The YANG data model in this document conforms to the Network Management Datastore Architecture (NMDA).

Full Tree of the Service AC Module The full tree of the ACaaS module is shown in .

AC Service Tree Structure ../../peer-groups/peer-group/name | | | +--ro local-as? inet:as-number | | | +--rw peer-as? inet:as-number | | | +--rw address-family? identityref | | | +--rw authentication | | | | +--rw enable? boolean | | | | +--rw keying-material | | | | +--rw (option)? | | | | +--:(ao) | | | | | +--rw enable-ao? boolean | | | | | +--rw ao-keychain? | | | | | key-chain:key-chain-ref | | | | +--:(md5) | | | | | +--rw md5-keychain? | | | | | key-chain:key-chain-ref | | | | +--:(explicit) | | | | +--rw key-id? uint32 | | | | +--rw key? string | | | | +--rw crypto-algorithm? identityref | | | +--rw status | | | +--rw admin-status | | | | +--rw status? identityref | | | | +--rw last-change? yang:date-and-time | | | +--ro oper-status | | | +--ro status? identityref | | | +--ro last-change? yang:date-and-time | | +--rw ospf | | | +--rw address-family? identityref | | | +--rw area-id yang:dotted-quad | | | +--rw metric? uint16 | | | +--rw authentication | | | | +--rw enable? boolean | | | | +--rw keying-material | | | | +--rw (option)? | | | | +--:(auth-key-chain) | | | | | +--rw key-chain? | | | | | key-chain:key-chain-ref | | | | +--:(auth-key-explicit) | | | | +--rw key-id? uint32 | | | | +--rw key? string | | | | +--rw crypto-algorithm? identityref | | | +--rw status | | | +--rw admin-status | | | | +--rw status? identityref | | | | +--rw last-change? yang:date-and-time | | | +--ro oper-status | | | +--ro status? identityref | | | +--ro last-change? yang:date-and-time | | +--rw isis | | | +--rw address-family? identityref | | | +--rw area-address area-address | | | +--rw authentication | | | | +--rw enable? boolean | | | | +--rw keying-material | | | | +--rw (option)? | | | | +--:(auth-key-chain) | | | | | +--rw key-chain? | | | | | key-chain:key-chain-ref | | | | +--:(auth-key-explicit) | | | | +--rw key-id? uint32 | | | | +--rw key? string | | | | +--rw crypto-algorithm? identityref | | | +--rw status | | | +--rw admin-status | | | | +--rw status? identityref | | | | +--rw last-change? yang:date-and-time | | | +--ro oper-status | | | +--ro status? identityref | | | +--ro last-change? yang:date-and-time | | +--rw rip | | | +--rw address-family? identityref | | | +--rw authentication | | | | +--rw enable? boolean | | | | +--rw keying-material | | | | +--rw (option)? | | | | +--:(auth-key-chain) | | | | | +--rw key-chain? | | | | | key-chain:key-chain-ref | | | | +--:(auth-key-explicit) | | | | +--rw key? string | | | | +--rw crypto-algorithm? identityref | | | +--rw status | | | +--rw admin-status | | | | +--rw status? identityref | | | | +--rw last-change? yang:date-and-time | | | +--ro oper-status | | | +--ro status? identityref | | | +--ro last-change? yang:date-and-time | | +--rw vrrp | | +--rw address-family? identityref | | +--rw status | | +--rw admin-status | | | +--rw status? identityref | | | +--rw last-change? yang:date-and-time | | +--ro oper-status | | +--ro status? identityref | | +--ro last-change? yang:date-and-time | +--rw oam | | +--rw bfd {vpn-common:bfd}? | | +--rw holdtime? uint32 | | +--rw status | | +--rw admin-status | | | +--rw status? identityref | | | +--rw last-change? yang:date-and-time | | +--ro oper-status | | +--ro status? identityref | | +--ro last-change? yang:date-and-time | +--rw security | +--rw encryption {vpn-common:encryption}? | | +--rw enabled? boolean | | +--rw layer? enumeration | +--rw encryption-profile | +--rw (profile)? | +--:(provider-profile) | | +--rw provider-profile? | | ac-svc:encryption-profile-reference | +--:(customer-profile) | +--rw customer-key-chain? | key-chain:key-chain-ref +--rw placement-constraints | +--rw constraint* [constraint-type] | +--rw constraint-type identityref | +--rw target | +--rw (target-flavor)? | +--:(id) | | +--rw group* [group-id] | | +--rw group-id string | +--:(all-accesses) | | +--rw all-other-accesses? empty | +--:(all-groups) | +--rw all-other-groups? empty +--rw ac* [name] +--rw customer-name? string +--rw description? string +--rw requested-start? yang:date-and-time +--rw requested-stop? yang:date-and-time +--ro actual-start? yang:date-and-time +--ro actual-stop? yang:date-and-time +--rw peer-sap-id* string +--rw ac-global-profile* ac-global-profile-reference +--rw ac-node-profile* ac-node-group-reference +--rw group* [group-id] | +--rw group-id string | +--rw precedence? identityref +--rw name string +--rw l2-connection | +--rw encapsulation | | +--rw type? identityref | | +--rw dot1q | | | +--rw tag-type? identityref | | | +--rw cvlan-id? uint16 | | +--rw priority-tagged | | | +--rw tag-type? identityref | | +--rw qinq | | +--rw tag-type? identityref | | +--rw svlan-id uint16 | | +--rw cvlan-id uint16 | +--rw (l2-service)? | | +--:(l2-tunnel-service) | | | +--rw l2-tunnel-service | | | +--rw type? identityref | | | +--rw pseudowire | | | | +--rw vcid? uint32 | | | | +--rw far-end? union | | | +--rw vpls | | | | +--rw vcid? uint32 | | | | +--rw far-end* union | | | +--rw vxlan | | | +--rw vni-id uint32 | | | +--rw peer-mode? identityref | | | +--rw peer-ip-address* inet:ip-address | | +--:(l2vpn) | | +--rw l2vpn-id? vpn-common:vpn-id | +--rw bearer-reference? string | {vpn-common:bearer-reference}? +--rw ip-connection | +--rw ipv4 {vpn-common:ipv4}? | | +--rw local-address? | | | inet:ipv4-address | | +--rw virtual-address? | | | inet:ipv4-address | | +--rw prefix-length? uint8 | | +--rw address-allocation-type? | | | identityref | | +--rw (allocation-type)? | | +--:(dynamic) | | | +--rw (address-assign)? | | | | +--:(number) | | | | | +--rw number-of-dynamic-address? uint16 | | | | +--:(explicit) | | | | +--rw customer-addresses | | | | +--rw address-pool* [pool-id] | | | | +--rw pool-id string | | | | +--rw start-address | | | | | inet:ipv4-address | | | | +--rw end-address? | | | | inet:ipv4-address | | | +--rw (provider-dhcp)? | | | | +--:(dhcp-service-type) | | | | +--rw dhcp-service-type? | | | | enumeration | | | +--rw (dhcp-relay)? | | | +--:(customer-dhcp-servers) | | | +--rw customer-dhcp-servers | | | +--rw server-ip-address* | | | inet:ipv4-address | | +--:(static-addresses) | | +--rw address* [address-id] | | +--rw address-id string | | +--rw customer-address? inet:ipv4-address | +--rw ipv6 {vpn-common:ipv6}? | +--rw local-address? | | inet:ipv6-address | +--rw virtual-address? | | inet:ipv6-address | +--rw prefix-length? uint8 | +--rw address-allocation-type? | | identityref | +--rw (allocation-type)? | +--:(dynamic) | | +--rw (address-assign)? | | | +--:(number) | | | | +--rw number-of-dynamic-address? uint16 | | | +--:(explicit) | | | +--rw customer-addresses | | | +--rw address-pool* [pool-id] | | | +--rw pool-id string | | | +--rw start-address | | | | inet:ipv6-address | | | +--rw end-address? | | | inet:ipv6-address | | +--rw (provider-dhcp)? | | | +--:(dhcp-service-type) | | | +--rw dhcp-service-type? | | | enumeration | | +--rw (dhcp-relay)? | | +--:(customer-dhcp-servers) | | +--rw customer-dhcp-servers | | +--rw server-ip-address* | | inet:ipv6-address | +--:(static-addresses) | +--rw address* [address-id] | +--rw address-id string | +--rw customer-address? inet:ipv6-address +--rw routing-protocols | +--rw routing-protocol* [id] | +--rw id string | +--rw type? identityref | +--rw routing-profiles* [id] | | +--rw id routing-profile-reference | | +--rw type? identityref | +--rw static | | +--rw cascaded-lan-prefixes | | +--rw ipv4-lan-prefixes* [lan next-hop] | | | {vpn-common:ipv4}? | | | +--rw lan inet:ipv4-prefix | | | +--rw lan-tag? string | | | +--rw next-hop union | | | +--rw metric? uint32 | | | +--rw status | | | +--rw admin-status | | | | +--rw status? identityref | | | | +--rw last-change? yang:date-and-time | | | +--ro oper-status | | | +--ro status? identityref | | | +--ro last-change? yang:date-and-time | | +--rw ipv6-lan-prefixes* [lan next-hop] | | {vpn-common:ipv6}? | | +--rw lan inet:ipv6-prefix | | +--rw lan-tag? string | | +--rw next-hop union | | +--rw metric? uint32 | | +--rw status | | +--rw admin-status | | | +--rw status? identityref | | | +--rw last-change? yang:date-and-time | | +--ro oper-status | | +--ro status? identityref | | +--ro last-change? yang:date-and-time | +--rw bgp | | +--rw peer-groups | | | +--rw peer-group* [name] | | | +--rw name string | | | +--ro local-address? inet:ip-address | | | +--ro local-as? inet:as-number | | | +--rw peer-as? inet:as-number | | | +--rw address-family? identityref | | | +--rw authentication | | | +--rw enable? boolean | | | +--rw keying-material | | | +--rw (option)? | | | +--:(ao) | | | | +--rw enable-ao? boolean | | | | +--rw ao-keychain? | | | | key-chain:key-chain-ref | | | +--:(md5) | | | | +--rw md5-keychain? | | | | key-chain:key-chain-ref | | | +--:(explicit) | | | +--rw key-id? uint32 | | | +--rw key? string | | | +--rw crypto-algorithm? | | | identityref | | +--rw neighbor* [id] | | +--rw id string | | +--rw remote-address? inet:ip-address | | +--ro local-address? inet:ip-address | | +--rw peer-group? | | | -> ../../peer-groups/peer-group/name | | +--ro local-as? inet:as-number | | +--rw peer-as? inet:as-number | | +--rw address-family? identityref | | +--rw authentication | | | +--rw enable? boolean | | | +--rw keying-material | | | +--rw (option)? | | | +--:(ao) | | | | +--rw enable-ao? boolean | | | | +--rw ao-keychain? | | | | key-chain:key-chain-ref | | | +--:(md5) | | | | +--rw md5-keychain? | | | | key-chain:key-chain-ref | | | +--:(explicit) | | | +--rw key-id? uint32 | | | +--rw key? string | | | +--rw crypto-algorithm? identityref | | +--rw status | | +--rw admin-status | | | +--rw status? identityref | | | +--rw last-change? yang:date-and-time | | +--ro oper-status | | +--ro status? identityref | | +--ro last-change? yang:date-and-time | +--rw ospf | | +--rw address-family? identityref | | +--rw area-id yang:dotted-quad | | +--rw metric? uint16 | | +--rw authentication | | | +--rw enable? boolean | | | +--rw keying-material | | | +--rw (option)? | | | +--:(auth-key-chain) | | | | +--rw key-chain? | | | | key-chain:key-chain-ref | | | +--:(auth-key-explicit) | | | +--rw key-id? uint32 | | | +--rw key? string | | | +--rw crypto-algorithm? identityref | | +--rw status | | +--rw admin-status | | | +--rw status? identityref | | | +--rw last-change? yang:date-and-time | | +--ro oper-status | | +--ro status? identityref | | +--ro last-change? yang:date-and-time | +--rw isis | | +--rw address-family? identityref | | +--rw area-address area-address | | +--rw authentication | | | +--rw enable? boolean | | | +--rw keying-material | | | +--rw (option)? | | | +--:(auth-key-chain) | | | | +--rw key-chain? | | | | key-chain:key-chain-ref | | | +--:(auth-key-explicit) | | | +--rw key-id? uint32 | | | +--rw key? string | | | +--rw crypto-algorithm? identityref | | +--rw status | | +--rw admin-status | | | +--rw status? identityref | | | +--rw last-change? yang:date-and-time | | +--ro oper-status | | +--ro status? identityref | | +--ro last-change? yang:date-and-time | +--rw rip | | +--rw address-family? identityref | | +--rw authentication | | | +--rw enable? boolean | | | +--rw keying-material | | | +--rw (option)? | | | +--:(auth-key-chain) | | | | +--rw key-chain? | | | | key-chain:key-chain-ref | | | +--:(auth-key-explicit) | | | +--rw key? string | | | +--rw crypto-algorithm? identityref | | +--rw status | | +--rw admin-status | | | +--rw status? identityref | | | +--rw last-change? yang:date-and-time | | +--ro oper-status | | +--ro status? identityref | | +--ro last-change? yang:date-and-time | +--rw vrrp | +--rw address-family? identityref | +--rw status | +--rw admin-status | | +--rw status? identityref | | +--rw last-change? yang:date-and-time | +--ro oper-status | +--ro status? identityref | +--ro last-change? yang:date-and-time +--rw oam | +--rw bfd {vpn-common:bfd}? | +--rw holdtime? uint32 | +--rw status | +--rw admin-status | | +--rw status? identityref | | +--rw last-change? yang:date-and-time | +--ro oper-status | +--ro status? identityref | +--ro last-change? yang:date-and-time +--rw security +--rw encryption {vpn-common:encryption}? | +--rw enabled? boolean | +--rw layer? enumeration +--rw encryption-profile +--rw (profile)? +--:(provider-profile) | +--rw provider-profile? | ac-svc:encryption-profile-reference +--:(customer-profile) +--rw customer-key-chain? key-chain:key-chain-ref ]]>

Acknowledgments TBC.

Contributors Nokia

victor.lopez@nokia.com

Ribbon Communications

Ivan.Bykov@rbbn.com

Huawei

bill.wu@huawei.com