>Does anyone know how to make CEF load balancing work over etherchannels
>and actually load balance on the etherchannel? >I have two GEC interfaces with 2 ports in each, and then I have two >routes multipath, one to each GEC interface >The problem is that the CEF algorithm is the same as the etherchannel >algorithm and each one of the etherchannels ends up only sending out one >of the two ports so it is not load balancing. I have tried changing >the port-channel load-balance setting to various things (I can not use >MAC because it's from one router to another) and I have tried changing >the cef load sharing algorithm. >Maybe this is a limitation of the 3750 platform? I have not tried this >on any of the other equipment. Hi there, I guess you have tried it, but here goes anyway.. Do you have several different source AND destinations IP-adresses using these links? If so, setting the following should be of some help: ! Set etherchannel load-balancing to use a <source IP> XOR <dest IP> hash port-channel load-balance src-dst-ip ! Set CEF algorithm load-balancing to use a different seed for the hashing ip cef load-sharing algorithm universal 1 If you have only one source-IP, this could mess up the hashing somewhat and reault in only one (or possibly a very skewed distribution) link in each of the portchannels to be used. If this is/has been tried and proven wrong, it was at least worth a try :) best regards, Stig Meireles Johansen _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
