The IESG has approved the following document: - 'YANG Data Model for Bidirectional Forwarding Detection (BFD)' (draft-ietf-bfd-rfc9127-bis-04.txt) as Proposed Standard
This document is the product of the Bidirectional Forwarding Detection Working Group. The IESG contact persons are Alvaro Retana, Andrew Alston and John Scudder. A URL of this Internet Draft is: https://datatracker.ietf.org/doc/draft-ietf-bfd-rfc9127-bis/ Technical Summary This version of the draft updates the 'ietf-bfd-types' module to define a new feature called 'client-base-cfg-parms and a 'if-feature' statement that conditionally includes definition of parameters such as 'multiplier' or 'desired-min-tx-interval'. The feature statement allows YANG implementations of protocol such as OSPF, ISIS, PIM and BGP, to support both a model where such parameters are not needed, such as when multiple BFD sessions are supported over a given interface, as well as when they need to be defined per session. As a result, the BFD MPLS module has to use the base-cfg-parms instead of client-cfg-parms to be able to include all the parameters unconditionally. Working Group Summary While the desired YANG changes were very small, this update is occurring a short time after the original publication of RFC 9127. It was decided to, as much as possible, to simply re-issue RFC 9127 to avoid potential confusion about the authoritative contents of the YANG modules for BFD. Consultation with the YANG doctors did indicate that a smaller document containing only the minimum required updates was an option. However, the authors and the interested parties in the Working Group participating in the discussion pushed for the larger document. The primary consideration that kept this document from being a simple copy and paste of the original RFC 9127 with the minor necessary changes was the iana-bfd-types module which was previously delegated to IANA in RFC 9127, and thus not eligible for re-publication in this document. Document Quality This module is intended to be leveraged both as the BFD management module along with providing BFD configuration for other IETF modules. It was as part of assessing impacts on other routing protocols that the motivating work for this update was discovered. The YANG doctors were consulted as part of this work, but no formal review was requested. Since this is largely a republication of RFC 9127, it is presumed that prior work this is based upon is well reviewed. Personnel : Who is the Document Shepherd? Jeffrey Haas. : Who is the Responsible Area Director? John Scudder.
