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Document: draft-ietf-bfd-unsolicited-10
Reviewer: Dan Romascanu
Review Date: 2022-11-02
IETF LC End Date: 2022-11-14
IESG Telechat date: Not scheduled for a telechat

Summary:

This is a well-written and clear document that describes procedures for
"unsolicited BFD" that allow a BFD session to be initiated by only one side,
and established without explicit per-session configuration or registration by
the other side (subject to certain per-interface or global policies), with the
goal of achieving operational simplification of "sessionless" applications
using Bidirectional Forwarding Detection (BFD).

The document is Ready from a Gen-ART perspective. A couple of editorial nits
need clarification and possible fixes.

Major issues:

Minor issues:

Nits/editorial comments:

1. Section 1 refers to draft-ietf-idr-rs-bfd which has the status Expired in
the Datatracker. Is the intention to stay with the archived version of this
Expired document?

2. Section 3 defines the new state variable Role as 'The role of the BFD
session as per [RFC5880], section 6.1.'.

However, RFC 5880 talks about role as an attribute of the system in session
initialization rather than one of the session.

> A system may take either an Active role or a Passive role in session
   initialization.  A system taking the Active role MUST send BFD
   Control packets for a particular session, regardless of whether it
   has received any BFD packets for that session.  A system taking the
   Passive role MUST NOT begin sending BFD packets for a particular
   session until it has received a BFD packet for that session, and thus
   has learned the remote system's discriminator value.  At least one
   system MUST take the Active role (possibly both).  The role that a
   system takes is specific to the application of BFD, and is outside
   the scope of this specification.

I believe that wording in the two documents needs to be aligned.