hi Ross,
Ross Vandegrift wrote:
Hi everyone,
Has anyone running SXH on a SUP720-3B(-XL) series 6500 tried "ip cef
optimize neighbor resolution"?
Cisco's docs seem to offer the usual tautologous explanation, and as a
bonus, include a circular reference:
LOL, classic.
Both indicate that it triggers "Layer 2 address resolution of neighbors
directly from Cisco Express Forwarding for IPv[46]".
Has anyone tried this? It sounds like this could be a win for a pair
of 6500s I have with unexplainable high RP utilization problems - the
boxes terminate a lot of VLANs and have a lot of ARP responsibilities.
But I can't really find much discussion of it.
the feature is essentially an enhancement for how CEF Gleans and the
like are handled.
if you're familiar with how those kinds of things work, they would
typically need to punt to software to resolve a (not yet available)
adjacency through ARP or similar.
the enhancement/optimization here is that it can do it with fewer CPU
cycles.
as to whether this would help in your scenario, its certainly a
possibility. but unless what you're seeing is a relatively short period
of higher CPU during ARP / IP to MAC discovery, me thinks you may want
to look into what your ARP aging timers are relative to your MAC aging
timers.
cheers,
lincoln.
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