Juniper Networks

1137 Innovation Way Sunnyvale CA USA jhead@juniper.net

Juniper Networks

1137 Innovation Way Sunnyvale CA USA prz@juniper.net

This document defines new BGP-LS (BGP Link-State) TLVs in order to carry IS-IS Flood Reflection information.

Introduction BGP Link-State RFC7752 defines mechanisms to advertise information about the underlying IGP in BGP NLRI to an external entity (e.g. a controller). New BGP-LS TLVs are required in order to faciliate IS-IS Flood Reflection extensions.

Requirements Language 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.

BGP-LS Extensions for IS-IS Flood Reflectors This document defines the following BGP-LS TLV code point value in accordance with RFC7752 rules: BGP-LS Flood Reflection TLV Code Points

TLV Code Point	Description	IS-IS TLV
TBD1	Flood Reflection TLV	TBD1 (161)

TLV formats are described in detail in subsequent subsections.

BGP-LS TLVs for IS-IS Flood Reflection This TLV advertises Flood Reflector details. The semantics and values of the fields in the TLV are described in .

Flood Reflection TLVs 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |C| RESERVED | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Flood Reflection Cluster ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

where:

• Type:

  TBD1

  Length:

  5

IANA Considerations This section requests entries from the "BGP-LS Node Descriptor, Link Descriptor, Prefix Descriptor, and Attribute TLVs" registry for the following TLVs:

Requested TLV Entries IANA Requests

TLV Code Point	Description
TBD1	Flood Reflection TLV

Security Considerations Procedures and protocol extensions defined in this document do not affect the BGP security model. See the "Security Considerations" section of for a discussion of BGP security. Also, refer to and for analyses of BGP security issues. Security considerations for acquiring and distributing BGP-LS information are discussed in . The TLVs introduced in this document are used to propagate IS-IS Flood Reflection TLVs defined in . These TLVs represent IS-IS Flood Reflector state and are therefore assumed to support any/all of the required security and authentication mechanisms as described in to prevent any security issues when propagating the TLVs into BGP-LS.

Acknowledgements

References Normative References 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.