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Hi, While reading this draft it occurred to me that perhaps it might be
more useful to approach this topic from the perspective of “What can go
wrong during graceful restart, what are the consequences and how can it be
fixed?” rather than focusing on the narrower topic of multiple
simultaneous nodal faults. For example, Scenario 1 in the draft may be interpreted as “What
should happen if a (non-ingress) restarting node fails to get a RecoveryPath message
from its downstream neighbour?”, Scenario 2 is “What should happen
if a (non-ingress) restarting node fails to get a Path message from its
upstream neighbour?” and so on. Whether each of these scenarios arises
due to multiple simultaneous nodal faults (as in the draft) or any other reason
(e.g. a subsequent control channel failure, restarting node being inundated
with messages etc.) is, in my opinion, secondary. I think the key thing is
to identify the potential problems and suggest appropriate remedial actions,
where the authors think existing documentation is insufficient, rather than
focusing on 5 different permutations of multiple node graceful restart. Regards, Femi From:
owner-ccamp@ops.ietf.org [mailto:owner-ccamp@ops.ietf.org] On Behalf Of Zafar Ali (zali) Dear Authors, This is Deja-vu to me.... Draft draft-ietf-ccamp-rsvp-restart-ext-05.txt
actually had a section on multiple node restart case and was rejected by the WG
as addressing multiple node restart case is NOT a goal (suffers from the
law of diminishing return). In other words the following statement in the "[GR-EXT] also extends the Hello message
to exchange information about the ability to support the RecoveryPath
message. The examples and procedures in [GR-EXT] focus
on the description of a single node restart when adjacent network nodes
are operative. Although the procedures are equally applicable
to multi-node restarts, no detailed explanation is provided." is not accurate. Please see section 4 on the earlier version
of the [GR-EXT], http://www.faqs.org/ftp/pub/internet-drafts/draft-rahman-ccamp-rsvp-restart-extensions-00.txt. Thanks Regards... Zafar |