Hello authors,
The encoding for the SRv6 BSID TLV requires the BSID to be present for signaling the Endpoint and Structure information. When a controller prefers not to specify the BSID (i.e., dynamic BSID allocation in the router) but still wants to indicate the desired behavior and structure, it can set the SRv6 BSID field to 0 with the S flag set to 0 and the B flag set to 1. Similarly, if the controller wants to specify flags (Eg: I-Flag) without providing a BSID, it can set the SRv6 BSID field to 0 and the S flag to 0. Is this correct ? The draft does not seem to clarify this. This is also the case for the segment types in draft-ietf-idr-bgp-sr-segtypes-ext where the SRv6 SID is optional.
Regards
Rajesh
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The IESG has received a request from the Inter-Domain Routing WG (idr) to consider the following document: - 'Advertising Segment Routing Policies in BGP' <draft-ietf-idr-sr-policy-safi-09.txt> as Proposed Standard The IESG plans to make a decision in the next few weeks, and solicits final comments on this action. Please send substantive comments to the last-call@xxxxxxxx mailing lists by 2024-11-11. Exceptionally, comments may be sent to iesg@xxxxxxxx instead. In either case, please retain the beginning of the Subject line to allow automated sorting. Abstract A Segment Routing (SR) Policy is an ordered list of segments (i.e., instructions) that represent a source-routed policy. An SR Policy consists of one or more candidate paths, each consisting of one or more segment lists. A headend may be provisioned with candidate paths for an SR Policy via several different mechanisms, e.g., CLI, NETCONF, PCEP, or BGP. This document specifies how BGP may be used to distribute SR Policy candidate paths. It introduces a BGP SAFI to advertise a candidate path of a Segment Routing (SR) Policy and defines sub-TLVs for the Tunnel Encapsulation Attribute for signaling information about these candidate paths. This documents updates RFC9012 with extensions to the Color Extended Community to support additional steering modes over SR Policy. The file can be obtained via https://datatracker.ietf.org/doc/draft-ietf-idr-sr-policy-safi/ The following IPR Declarations may be related to this I-D: https://datatracker.ietf.org/ipr/2984/ https://datatracker.ietf.org/ipr/5890/ https://datatracker.ietf.org/ipr/5891/ The document contains these normative downward references. See RFC 3967 for additional information: rfc4272: BGP Security Vulnerabilities Analysis (Informational - Internet Engineering Task Force (IETF) stream) draft-ietf-idr-bgp-ls-sr-policy: Advertisement of Segment Routing Policies using BGP Link-State (None - Internet Engineering Task Force (IETF) stream) draft-ietf-idr-bgp-sr-segtypes-ext: Segment Routing Segment Types Extensions for BGP SR Policy (None - Internet Engineering Task Force (IETF) stream) rfc6952: Analysis of BGP, LDP, PCEP, and MSDP Issues According to the Keying and Authentication for Routing Protocols (KARP) Design Guide (Informational - Internet Engineering Task Force (IETF) stream)
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