GSR and bgp maximum-paths
Long time listener, first time caller. I would like to enable multipath bgp on a GSR running 12.0(10)S that has two bgp neighbors in the same AS connected via OC-3 pos in order to load balance outbound traffic across the two pos connections. I've checked out the cisco bug search and haven't found any for this feature on this release of IOS. Is anyone else have any problems with "maximum-paths" on a GSR and if yes, what release of IOS? Any other issues I should be aware of? Thanks, James __ James DeMong Network Design Specialist TELUS Advanced Communications Phone: (403) 503-3718 Email: James.DeMong@telus.com
Is anyone else have any problems with "maximum-paths" on a GSR and if yes, what release of IOS? Any other issues I should be aware of?
It may not affect you (given you are running 12.0(10)S), but having maximum-paths set to something other than 1 can cause problems on Engine 2 linecards. The result is that the CEF IPC Background process eats all available linecard CPU. Packet forwarding is not directly affected, but it can mean that the CEF tables take a long time to converge after a routing flap. As far as I am aware the bug was introduced around 12.0(13.6)S, and has not been fixed in any releases so far. However, this is starting to stray into cisco-nsp territory. :-) Rob
participants (2)
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James DeMong -
Rob Evans