Minutes IETF120: bier: Thu 20:00
minutes-120-bier-202407252000-00

IETF 120 BIER Session Agenda
WG info: https://datatracker.ietf.org/group/bier/about/
Chairs:
Greg Shepherd (gjshep@gmail.com)
Tony Przygienda (tonysietf@gmail.com)
Secretary:
Zheng(Sandy) Zhang (zhang.zheng@zte.com.cn)

Thursday Session II 13:00-14:30 Local time, July 25, 2024

1. WG Status, Chairs
   About the milestone updating, poll result: yes 7, no 0, no opnion 0;

2. draft-zzhang-bier-unmasked-bier, Tony Przygienda
   Jeff Tantsura: Highly support this draft. The BFR-ID may belong to
   different set. Needs to be hardware friendly.
   Tony Przygienda: Yes, needs to be translated to set lookup as
   simplest solution but there are other tricks.
   Others invited to contribute.

3. draft-zzhang-bier-brownfield-options, Jeffrey Zhang
   Hooman Bidgoli: If some overlay technologies should be included in
   this draft, such pim over bier or mldp, etc.
   Hooman Bidgoli: Alvaro suggested the PIM light draft.
   Jeffrey Zhang: It's a good idea to cover overlay info here.
   Tony Przygienda: The DR election function used by all the overlay
   protocols is needed to be put in place. Did the work progress?
   Hooman Bidgoli: The part is missing because there is no hello in PIM
   light and hence they did yet another thing.
   Agree with the work adding DR election part in the draft is needed.

   Chair start the adoption poll for this draft: yes 5, no 0, no
   oponion 0.

4. draft-liu-bier-uloop, Yuanxiang Qiu
   Tony Przygienda: This looks like IGP protection pretty much and rLFA
   would do same without delays introduced here. The
   point-to-multipoint protection is interesting but what kind of p2mp
   would you use for that?
   Jeffrey Zhang: If just using the existing technology for backup
   calculation, what's the difference?
   Yuanxiang Qiu: The first difference is the address used to calculate
   the PQ space. BIER uses the BFR prefix of BFER, while unicast uses
   the address of the destination node. The second is whether the
   method of establishing a repair path needs to distinguish between
   fault and fault recovery. The third is that if multiple BFERs has
   the same repair path, BIER can share path.
   Jeffrey Zhang: In IGP backup calculation calculates the path to
   prefix, in BIER calculation the path to BFR-ID, they are individual
   calculation. So if you break down, you need to reuse igp
   calculation.