[Idr] Re: RFC 9871 on BGP Color-Aware Routing (CAR)

[Jeffrey Haas <[e-mail]>]

Some belated congratulations to the authors and the IDR working group for publishing BGP-CAR as an RFC!

-- Jeff


> On Nov 20, 2025, at 4:57 PM, [e-mail] wrote:
> 
> A new Request for Comments is now available in online RFC libraries.
> 
> 
>        RFC 9871
> 
>        Title:      BGP Color-Aware Routing (CAR) 
>        Author:     D. Rao, Ed.,
>                    S. Agrawal, Ed.
>        Status:     Experimental
>        Stream:     IETF
>        Date:       November 2025
>        Mailbox:    [e-mail],
>                    [e-mail]
>        Pages:      76
>        Updates/Obsoletes/SeeAlso:   None
> 
>        I-D Tag:    draft-ietf-idr-bgp-car-16.txt
> 
>        URL:        https://www.rfc-editor.org/info/rfc9871
> 
>        DOI:        10.17487/RFC9871
> 
> This document describes a BGP-based routing solution to establish
> end-to-end intent-aware paths across a multi-domain transport
> network. The transport network can span multiple service provider and
> customer network domains. The BGP intent-aware paths can be used to
> steer traffic flows for service routes that need a specific intent.
> This solution is called BGP Color-Aware Routing (BGP CAR). 
> 
> This document describes the routing framework and BGP extensions to
> enable intent-aware routing using the BGP CAR solution. The solution
> defines two new BGP SAFIs (BGP CAR SAFI and BGP VPN CAR SAFI) for
> IPv4 and IPv6. It also defines an extensible Network Layer
> Reachability Information (NLRI) model for both SAFIs that allows
> multiple NLRI types to be defined for different use cases.  Each type
> of NLRI contains key and TLV-based non-key fields for efficient
> encoding of different per-prefix information. This specification
> defines two NLRI types: Color-Aware Route NLRI and IP Prefix NLRI. It
> defines non-key TLV types for the MPLS label stack, SR-MPLS label
> index, and Segment Routing over IPv6 (SRv6) Segment Identifiers
> (SIDs). This solution also defines a new Local Color Mapping (LCM)
> Extended Community.
> 
> This document is a product of the Inter-Domain Routing Working Group of the IETF.
> 
> 
> EXPERIMENTAL: This memo defines an Experimental Protocol for the
> Internet community.  It does not specify an Internet standard of any
> kind. Discussion and suggestions for improvement are requested.
> Distribution of this memo is unlimited.
> 
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