Hi all,
I have asked the following question about the Applicability of Bidirectional
Forwarding Detection (BFD) for Multi-point Networks in Virtual Router
Redundancy Protocol (VRRP)
draft<https://datatracker.ietf.org/doc/html/draft-ietf-rtgwg-vrrp-p2mp-bfd-12>
during the RTGWG session in Madrid today:
Q1: What happens if one of the VRRP routers on the LAN in question does
not support BFD for Multi-point network?
My guess (FWIW) that such routers would receive P2MP BFD packets
at high rate and trap them to the CPU - and then to generate
Destination Unreachable - Port Unreachable IGMP messages...
Q2: What happens to the hosts on the LAN in question if the L2 switches
implementing this LAN flood multi-point BFD packets?
My guess is that these hosts would experience high load receiving these packets
at presumably high rate.
I have also clarified that, to the best of my understanding, the purpose of
using BFD for detection of the Active router down is to replace fast
advertisement of VRRP Advertisement messages with something else. With this
understanding, using some form of 1-hop IP BFD (RFC 5881) looks obviously
preferable to using P2MP BFD flavors.
Regards,
Sasha
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