MPLS WG session - Tuesday Session IV
IETF 119 (Brisbane & Online) – Mar. 2024

WG Chairs:
Tarek Saad
Nic Leymann
Adrian Farrel
Tony Li

WG Secretary: Mach Chan

1. WG Status Update (Agenda Bashing) - 17:30
   ○ Duration: 15 mins
   ○ Presenter: WG Chairs

2. IANA Registry for the First Nibble Following a Label Stack - 17:45
   ○ ID: https://datatracker.ietf.org/doc/draft-ietf-mpls-1stnibble
   ○ Duration: 10 mins
   ○ Presenter: Greg Mirsky
   [Tarek]: you are deprecating LSRs relying on the heuristic of the
   1st nibble to infer the flow ID. Should we mention the recommended
   way to identify a flow in MPLS packet?
   [Greg]: Entroy label and/or PW FAT label
   [Kireeti]: we can say it MUST NOT use 0x4 or 0x6, but we can
   recommend using EL/FAT for flow identification
   [Kireeti]: on the new IANA registry (?)
   [Greg]: the intention is to encourage applications to set 0x0 and
   0x1.
   [Adrian]: should mention that this document is fixing a security
   issue of relying on the first nibble.

3. Use Cases for MPLS Network Action Indicators and MPLS Ancillary Data

   • 17:55
     ○ ID: https://datatracker.ietf.org/doc/draft-ietf-mpls-mna-usecases

   ○ Duration: 10 mins
   ○ Presenter: Greg Mirsky
   [Greg]: authors think that the document is in good shape to
   progress to WG LC and we welcome review and comments from the WG.

4. Extending ICMP for IP-related Information Validation - 18:05
   ○ ID:
   https://datatracker.ietf.org/doc/draft-liu-6man-icmp-verification
   ○ Duration: 10 mins
   ○ Presenter: Yao Liu
   [Mathew]: not clear what you are verifying against what. In MPLS
   we check if it's correct binding against a label. What is being
   verified?
   [Yao]: verify the correct SRv6 SID (including service) on egress
   against what is signaled in control plane (e.g. BGP)
   [Mathew]: suggest presenting this in BESS - may have applicability
   there