04-12-2007 06:07 AM - edited 03-05-2019 03:25 PM
Hi Folks,
I am trying to understand how the algorithm for Etherchannel load balancing works. If is select port-channel load-balance src-ip and i have say 4 channel members (g1/0/1,g1/0/2,g1/0/3,g1/0/4) lets assume that IP1 goes to g1/0/1 when all are active. If g1/0/4 goes down, will IP1 still remain on g1/0/1 or will it be re-assigned? The question really is whether the traffic assigned to a link will be remain on the link if another member fails?
TIA
Alan
04-12-2007 06:14 AM
Hi
I will be automatically swithced to other link.
Thanks
Mahmood
04-12-2007 06:20 AM
Hi Mahmood,
So you are saying that there will be a global re-assignment within the etherchannel if any member fails?
Thanks
Alan
04-12-2007 06:22 AM
Alan:
The EtherChannel Frame distribution hashing algorithm performs an XOR operation on one or more low-order bits of the addresses. For a 2 port bundle the last bit is used. For a 4 port bundle the last two bits are used. For an 8 port bundle the last 3 bits are used. If a link fails then the traffic will move to the remaining links. Hope this helps.. Please rate...
04-12-2007 06:28 AM
Assuming I started with a 4 port bundle, one member subsequently failed (3 remaining), would it still XOR on the last two bits?
Also in the XOR, does the IP XOR with the channel member number?
Thanks
Alan
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