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Etherchannel not load balance traffic on 7204 VXR and Cat 4000

I have a 7204 VXR running 12-2-17a.bin and a Catalyst 4006 with a routing module 12-0-18-ws22a.bin. The problem is I could see the Etherchannel bundle but traffic is only going mainly on one of the link rather that distribute the traffic between the links in the bundle. Has anybody know whether it is an OS issue or something else?

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Cisco Employee

Re: Etherchannel not load balance traffic on 7204 VXR and Cat 40

Can you be more specific about which etherchannel you are refering to? Is this the backplane channel from 4232 or is it a GEC from 4232 to 7200 or is it a FEC from a group of the FE ports to the 7200? In any case the issue is likely due to destination traffic for the router. The load balancing is based on src-dst mac for FEC and src-dst ip for GEC. Your traffic patterns may be explained if you look at these characteristics of your frames/packets.

New Member

Re: Etherchannel not load balance traffic on 7204 VXR and Cat 40

Below is the explanation of how EC load-balancing works. Perhaps you can try to twist the "load-balance" parameter to see if it helps to fix your problem.

Does anyone know what is the default setting of load-balancing for EC in Cat4000? MAC addresses, IP addresses, or Layer 4 port numbers ???

For Cat. 4000, etherchannel load balancing can use MAC addresses, IP addresses, or Layer 4 port numbers and either source, destination, or both. Use the option that provides the greatest variety in your configuration. For example, if the traffic on a channel is only going to a single MAC address, using the destination MAC address always chooses the same link in the channel. Using source or IP addresses might result in better load balancing. The load balancing can be configured using the port-channel load-balance {src-mac | dst-mac | src-dst-mac | src-ip | dst-ip | src-dst-ip | src-port | dst-port | src-dst-port} global configuration command.

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