RFC 9871: BGP Color-Aware Routing (CAR)
In plain English — editorial summary, not part of the RFC
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.
Document record
- Document ID
- RFC9871
- Published
- November 2025
- Authors
- D. Rao; S. Agrawal
- Status
- EXPERIMENTAL
- Stream
- IETF
- Area
- rtg
- Pages
- 76
- Also known as
- —
Topics
Related documents
Ranked automatically by shared keywords, IETF area and stream — not by editorial selection.
- RFC 9832BGP Classful Transport PlanesCurrent
September 2025
- RFC 9723BGP Colored Prefix Routing (CPR) for Services Based on Segment Routing over IPv6 (SRv6)Current
May 2025
- RFC 9866Root Node Failure Detector (RNFD): Fast Detection of Border Router Crashes in the Routing Protocol for Low-Power and Lossy Networks (RPL)Current
October 2025
- RFC 9863Path Computation Element Protocol (PCEP) Extension for ColorCurrent
October 2025
- RFC 9862Path Computation Element Communication Protocol (PCEP) Extensions for Segment Routing (SR) Policy Candidate PathsCurrent
October 2025
- RFC 9860Multicast-Only Fast Reroute (MoFRR) Based on Topology Independent Loop-Free Alternate (TI-LFA) Fast RerouteCurrent
October 2025
- RFC 9884Label Switched Path Ping for Segment Routing Path Segment Identifier with MPLS Data PlaneCurrent
October 2025
- RFC 9857Advertisement of Segment Routing Policies Using BGP - Link StateCurrent
October 2025
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