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RFC 9723
Title: BGP Colored Prefix Routing (CPR) for
Services Based on Segment Routing over IPv6 (SRv6)
Author: H. Wang,
J. Dong,
K. Talaulikar,
T. Han,
R. Chen
Status: Informational
Stream: IETF
Date: May 2025
Mailbox: [email protected],
[email protected],
[email protected],
[email protected],
[email protected]
Pages: 13
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-idr-cpr-08.txt
URL: https://www.rfc-editor.org/info/rfc9723
DOI: 10.17487/RFC9723
This document describes a mechanism to advertise IPv6 prefixes in BGP
that are associated with Color Extended Communities to establish
end-to-end intent-aware paths for Segment Routing over IPv6 (SRv6)
services. Such IPv6 prefixes are called "Colored Prefixes", and this
mechanism is called "Colored Prefix Routing" (CPR). In SRv6 networks,
the Colored Prefixes are the SRv6 locators associated with different
intents. SRv6 services (e.g., SRv6 VPN services) with a specific
intent could be assigned with SRv6 Segment Identifiers (SIDs) under
the corresponding SRv6 locators, which are advertised as Colored
Prefixes.
This operational methodology allows the SRv6 service traffic to be
steered into end-to-end intent-aware paths based on the longest
prefix matching of SRv6 Service SIDs to the Colored Prefixes. The
existing IPv6 Address Family and Color Extended Community are reused
to advertise IPv6 Colored Prefixes without new BGP extensions; thus,
this mechanism is easy to interoperate and can be deployed
incrementally in multi-Autonomous System (AS) networks that belong to
the same trusted domain.
This document is a product of the Inter-Domain Routing Working Group of the
IETF.
INFORMATIONAL: This memo provides information for the Internet community.
It does not specify an Internet standard of any kind. Distribution of
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