3750 Stack to 3750 Stack 10GB and 1GB Connections

[rcustersp]

I have two 3750 stacks that are currently connected using two1GB fiber connections in an etherchannel. I now added new switches to each stack with 10GB modules in them. We would like to bring up the 10GB connection, but still have one of the 1GB lines as a backup, or even the whole etherchannel. Is there a way for us to make the 10GB the main and the 1GB the standby?

[Sergey Fer]

Sure. It is called Spanning-tree Protocol MSTP is a best way, I think. There are many other ways to do it, including L3 dynamic routing.

[Devavrat Oka]

STP would prefer the links based on cost calculation.

If these are L3 links, then use routing for failover.

[Joseph W. Doherty]

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Posting

STP and routing are the "usual suspects", but another L2 option might be Flex Links.