Document: draft-ietf-idr-bfd-subcode-03
Reviewer: Mohamed Boucadair
Review Date: 05/10/2022
IETF LC End Date: N/A
Intended Status: Standards Track

I have been selected to do a routing directorate “early” review of this draft. 

# General

The specification is on good track and its core contribution is ready. However, there are some very few points that I suggest to fix:

## Use consistent terminology (see more in the detailed review provided below)

## Consider adding a pointer to the BGP YANG module as an example to tweak the associated BFD timers. Likewise, consider listing last-error (YANG) data node in addition to the MIB mention.  

## The Security Considerations Section should ACK at least the dependency on the BFD to take actions. Manipulating the BFD session will thus have implications on the BGP connection. 

## IANA Considerations: The assignment is currently temporary (as per https://www.iana.org/assignments/bgp-parameters/bgp-parameters.xhtml#bgp-parameters-4). IANA should be requested to make that assignment permanent. I would update the text accordingly. 

## Consider moving at least RFC8538 to be listed as normative. 

# Detailed Review: 

FWIW, my detailed review can be found at:

* pdf: https://github.com/boucadair/IETF-Drafts-Reviews/raw/master/draft-ietf-idr-bfd-subcode-03-rev%20Med.pdf
* doc: https://github.com/boucadair/IETF-Drafts-Reviews/raw/master/draft-ietf-idr-bfd-subcode-03-rev%20Med.doc