Hi.
I
need to change the etherchannel load balancing method for etherchannels
on my switches from per-module, to src-dest-port. Can I do this
without causing a major issue for my network?
Hi,
Basically EtherChannel frame distribution uses a Cisco-proprietary hashing algorithm. The algorithm is deterministic; if you use the same addresses and session information, you always hash to the same port in the channel. This method prevents out-of-order packet delivery. EtherChannel load balancing can use MAC addresses, IP addresses, or Layer 4 port numbers with a Policy Feature Card 2 (PFC2) and either source mode, destination mode, or both. The mode you select applies to all EtherChannels that you configure on the switch. Use the option that provides the greatest variety in your configuration.
For example, if the traffic on a channel only goes to a single MAC address, use of the destination MAC address results in the choice of the same link in the channel each time. Use of source addresses or IP addresses can result in a better load balance.
It is always be recommended to do on switch where you dont have much load to see the traffic pattern is working fine after changing the mode.
Hope to Help !!
Ganesh.H
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