It has come to my attention that the behavior for helper routers during a
graceful restart in RFC 3623 suffers from multiple interpretations.
Here is the excerpt from section 3.2, page 8:
When Router Y exits helper mode for X on a given network segment, it
reoriginates its LSAs based on the current state of its adjacency to
Router X over the segment. In detail, Y takes the following actions:
a) Y recalculates the Designated Router for the segment,
b) Y reoriginates its router-LSA for the segment's OSPF area,
c) if Y is Designated Router for the segment, it reoriginates the
network-LSA for the segment and
d) if the segment was a virtual link, Y reoriginates its router-
LSA for the virtual link's transit area.
I know what what was meant by this text since I was one of the authors. For
robustness, the restarting router will reoriginate its Router-LSAs and
Network-LSAs as described in section 2.3. However the phrase "based on the
current state of its adjacency to Router X over the segment" was meant to mean
that the helper routers would reoriginate their LSAs when graceful restart
constituted a change to the LSA. However, it appears some have interpreted
this to mean that the helper should unconditionally reoriginate its LSAs. I
know one popular test equipment vendor interpreted it in this manner. I'd be
curious as to whether others interpreted it this way as well.
Thanks,
Acee
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