Babel Information Model

Babel is a loop-avoiding distance-vector routing protocol defined in RFC 6126. Babel Hashed Message Authentication Code (HMAC) Cryptographic Authentication, defined in RFC 7298, describes a cryptographic authentication mechanism for the Babel routing protocol. This document describes an information model for Babel (including HMAC) that can be used to created management protocol data models (such as a netconf YANG data model). Other Babel extensions may be included in this document when they become working group drafts. Due to the simplicity of the Babel protocol and the fact that it is designed to be used in non-professionally administered environments (such as home networks), most of the information model is focused on reporting status of the Babel protocol, and very little of that is considered mandatory to implement (conditional on a management protocol with Babel support being implemented). Some parameters may be configurable; however, it is up to the Babel implementation whether to allow any of these to be configured within its implementation. Where the implementation does not allow configuration of these parameters, it may still choose to expose them as read-only.

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119.

This document uses a programming language-like notation to define the properties of the objects of the information model. An optional property is enclosed by square brackets, [ ], and a list property is indicated by two numbers in angle brackets, <m..n>, where m indicates the minimal number of values, and n is the maximum. The symbol * for n means no upper bound.

; babel-constants-obj babel-constants; babel-interfaces-obj babel-interfaces<1..*>; babel-sources-obj babel-sources<1..*>; babel-routes-obj babel-routes<1..*>; }babel-information-obj; ]]> babel-version: the version of this implementation of the Babel protocol babel-self-router-id: the router-id used by this instance of the Babel protocol to identify itself babel-self-seqno: the current sequence number included in route updates for routes originated by this node babel-cost-comp-algorithm: a set of names of supported cost computation algorithms; possible values include "k-out-of-j", "ETX" babel-constants: a babel-constants object babel-interfaces: a set of babel-interface objects babel-sources: a set of babel-source objects babel-routes: a set of babel-route objects

babel-udp-port: UDP port for sending and listening for Babel messages; MAY be configurable babel-hello-interval-lossy: Hello Interval default for lossy links in milliseconds; MAY be configurable babel-hello-interval-lossless: Hello Interval default for lossless links in milliseconds; MAY be configurable babel-ihu-interval: IHU Interval default as multiples of Hello interval babel-update-interval: Update Interval default as multiples of Hello interval babel-ihu-hold-time: IHU Hold Time default as multiples of Hello interval babel-route-expiry-time: IHU Interval default as multiples of Hello interval babel-garbage-collection-time: Garbage Collection time default as multiples of Update interval babel-max-trigger-delay: Maximum delay to wait before sending a triggered update in milliseconds babel-max-normal-delay: Maximum delay to wait before sending a non-triggered message in milliseconds babel-ack-limit: Threshold for requesting acknowledgements on an interface (do not request acknowledgements if there are more than this many neighbors on the interface); MAY be configurable babel-resend-trigger-lossy-limit: Resend limit of triggered updates on lossy links (can this be the same, whether or not acknowledgements are requested?) babel-resend-trigger-lossless-limit: Resend limit of triggered updates on lossless links (can this be the same, whether or not acknowledgements are requested?) babel-resend-normal-lossy-limit: Resend limit of normal messages on lossy links babel-resend-normal-lossless-limit: Resend limit of normal messages on lossless links

; [babel-csa-obj babel-csa<1..*>;] }babel-interfaces-obj; ]]> babel-interface-reference: reference to an interface object as defined by the data model babel-interface-seqno: the current sequence number in use for this interface babel-interface-hello-interval: the current hello interval in use for this interface babel-interface-update-interval: the current update interval in use for this interface babel-request-trigger-ack: requests acknowledgement of triggered updates (if number of neighbors less than babel-ack-limit); MAY be configurable babel-lossy-link: indicates (if true) that the link of this interface is considered lossy; MAY be configurable babel-external-cost: external input to cost of link of this interface (need to determine how to express this);MUST be configurable if implemented

babel-neighbor-address: (IPv4 or v6) address the neighbor sends messages from babel-hello-history: the Hello history (do we want a human readable format?) babel-txcost: transmission cost value from the last IHU packet received from this neighbor, or FFFF hexadecimal (infinity) if the IHU hold timer for this neighbor has expired babel-hello-seqno: expected Hello sequence number babel-neighbor-ihu-interval: current IHU interval for this neighbor babel-router-id: router-id of the neighbor babel-rxcost: reception cost calculated for this neighbor

placeholder: this section to be filled in, in the future

babel-source-prefix: Prefix (with prefix length) babel-source-router-id: router-id of the router originating this prefix babel-source-seqno: last sequence number used by this source babel-source-metric: this source's feasibility distance babel-source-garbage-collection-time: garbage-collection timer for this source

babel-route-prefix: Prefix (with prefix length) for which this route is advertised babel-route-router-id: router-id of the router originating this prefix babel-route-neighbor: neighbor that advertised this route (is this a router-id ?) babel-route-metric: the metric with which this route was advertised by the neighbor, or FFFF hexadecimal (infinity) for a recently retracted route babel-route-seqno: the sequence number with which this route was advertised babel-route-next-hop: the next-hop address of this route babel-route-selected: a boolean flag indicating whether this route is selected, i.e., whether it is currently being used for forwarding and is being advertised