Wednesday, November 7, 2018

CEF and LoadSharing

Hello IT people,

I have a simple question regarding that cisco express forawrding stuff. I have to double-check correct configuration from not-so-much trustworthy provider. Mainly composed of C800 series (15.2(4)M6 , 15.4(2)T3, etc..)

For few ios version , output of my Sh ip cef X.X.X.X platform is something like :

Loadinfo wxyz => assuming refering to the pointer in the loadshare table? per-session => Is it the type of load-sharing ? Per-session as oppose to per-packet or per-flow ?

Correct me if I'm wrong but the load sharing is very different from load balancing isn't it ? I mean for N parallel path it's possible that the hash mecanic forward lot's of @ip dst/src flow on one link leaving the others whitout trafic. So the opposite is true : the more couple of session you have more redistributed your trafic is across those N parallel link ?

Is there any solution to "split" more when the bulk of the trafic is to a single IP adress (proxy) ? Assuming per-flow load sharing but not sure.

Bonus : How do I see the loadsharing table built by CEF along FIB and adjacency table ?



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