Segment Routing v6 Configuration Guide for Cisco 8000 Series Routers, Cisco IOS XR Releases

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Segment Routing v6 Configuration Guide for Cisco 8000 Series Routers, Cisco IOS XR Releases

SRv6 SID Information in BGP-LS Reporting

Updated: September 8, 2026

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Explains how BGP-LS reports SRv6 topology and SID information to external controllers, improving network visibility and centralized path computation.

SRv6 SID Information in BGP-LS Reporting is a SRv6 feature that

  • enhances BGP Link-State (BGP-LS) by extending its topology reporting capabilities

  • adds the capability to report comprehensive SRv6 SID Network Layer Reachability Information (NLRI), and

  • enables detailed reporting of SRv6 domain topologies.

Table 1. Feature History Table

Feature Name

Release Information

Feature Description

SRv6 SID Information in BGP-LS Reporting

Release 25.4.1

Introduced in this release on: Fixed Systems (8700 [ASIC: K100], 8010 [ASIC: A100])(select variants only*)

*This feature is supported on:

  • 8711-48Z-M

  • 8011-32Y8L2H2FH

  • 8011-12G12X4Y-A/D

SRv6 SID Information in BGP-LS Reporting

Release 25.1.1

Introduced in this release on: Fixed Systems (8010 [ASIC: A100])(select variants only*)

*This feature is supported on Cisco 8011-4G24Y4H-I routers.

SRv6 SID Information in BGP-LS Reporting

Release 24.4.1

Introduced in this release on: Fixed Systems (8200 [ASIC: P100], 8700 [ASIC: P100, K100])(select variants only*); Modular Systems (8800 [LC ASIC: P100])(select variants only*)

You can use BGP Link-State (BGP-LS) to report the domain topology with nodes, links, and prefixes. This feature supports reporting SRv6 Segment Identifier (SID) Network Layer Reachability Information (NLRI).

*This feature is supported on:

  • 8212-48FH-M

  • 8711-32FH-M

  • 8712-MOD-M

  • 88-LC1-36EH

  • 88-LC1-12TH24FH-E

  • 88-LC1-52Y8H-EM

Network Layer Reachability Information (NLRI)

NLRI is the information about network destinations (prefixes, SIDs, etc.) and how to reach them. It's essentially the routing information that a router advertises to its peers, allowing other routers to build their forwarding tables and determine paths through the network.

For example, NLRI is used to describe various types of SRv6-specific information reported by BGP-LS. These NLRI has been added to the BGP-LS protocol to support SRv6:

  • Node NLRI: SRv6 Capabilities, SRv6 MSD types

  • Link NLRI: End.X, LAN End.X, and SRv6 MSD types

  • Prefix NLRI: SRv6 Locator

  • SRv6 SID NLRI (for SIDs associated with the node): Endpoint Function, BGP-EPE Peer Node/Set

You can use these commands to ping or trace an SRv6 Segment Identifier (SID):

  • Ping a specific SID: ping B:k:F::

  • Traceroute a specific SID: traceroute B:k:F::

  • Ping or traceroute a SID using a list of packed carriers: ping <destination SID> via srv6-carriers <list of packed carriers>traceroute <destination SID> via srv6-carriers <list of packed carriers>

Configure SRv6 SID Information in BGP-LS Reporting

Use this task to configure IS-IS to distribute SRv6 link-state data, enabling BGP-LS to report comprehensive SRv6 Segment Identifier (SID) Network Layer Reachability Information (NLRI) within the domain.

Distributing IS-IS SRv6 link-state data to BGP-LS is essential for network visibility and for enabling diagnostic tools like SRv6 ping and traceroute to utilize the reported SID information. This configuration allows BGP-LS to build a detailed topology view that includes SRv6-specific elements.

Procedure

Configure the distribution of link-state data for the specified instance ID.

Example:

Router(config)# router isis 200
Router(config-isis)# distribute link-state instance-id 200