Signaling Entropy Label Capability and Entropy Readable Label Depth Using IS-IS
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From: The IESG <firstname.lastname@example.org> To: IETF-Announce <email@example.com> Cc: Acee Lindem <firstname.lastname@example.org>, email@example.com, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, The IESG <email@example.com>, firstname.lastname@example.org, email@example.com Subject: Protocol Action: 'Signaling Entropy Label Capability and Entropy Readable Label Depth Using IS-IS' to Proposed Standard (draft-ietf-isis-mpls-elc-13.txt) The IESG has approved the following document: - 'Signaling Entropy Label Capability and Entropy Readable Label Depth Using IS-IS' (draft-ietf-isis-mpls-elc-13.txt) as Proposed Standard This document is the product of the Link State Routing Working Group. The IESG contact persons are Alvaro Retana, Martin Vigoureux and Deborah Brungard. A URL of this Internet Draft is: https://datatracker.ietf.org/doc/draft-ietf-isis-mpls-elc/
Technical Summary This document specifies extensions to IS-IS Prefix attribute advertisement to indicate whether or not a prefix is Entropy Label Capable (ELC), i.e., eligible for entropy label processing. Additionally, a new MSD type is defined to advertise the Entropy Readable Label Depth (ERLD). The ELRD will be advertised using the existing Maximum SID Depth (MSD) encodings defined in RFC 8476. Finally, the mapping of these extensions to existing BGP-LS encodigs is specified. Working Group Summary The draft went through multiple iterations due to a change in requirements. Originally, the ELC was a node-level attribute. However, a Service Provider (SP) use case relating to external prefix advertisement required per-prefix advertisement. A second change was required when the BGP-LS encodings specification was incorporated into the draft. Since this incorporation obviated the BGP-LS draft, a sixth author was added. Document Quality This document has been a WG document over 4 years. While it has gone through several iterations, we are now confident that it is ready for publication. Personnel Acee Lindem is the Document Shepherd. Alvaro Retana is the Responsible Area Director.