Dual Trunks Between Stacks

[loren.anuszewski]

Hi,

I have 2 3750 switch stacks which I would like to have redundant trunks between them.  This will provide two physical connections traveling through different geographical locations for redundancy in the event that a cable is severed.  I couldn't find anything in regards to setup/config.  Does it matter if I go stack1/switch1 to stack2/switch1 and stack1/switch2 to stack2/switch2 or should they cross to opposite switches like a stack cable?  I don't think that should be necessary, but couldn't find any documentation.  Should there be an issue with loops?

Thanks!

[Kevin Dorrell]

I had exactly that and it was working very well. Make a cross-chassis etherchannel on each end and it does not matter whether you cross the connections or go parallel.


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[ahmedumair]

I have also implemented the same and it is working fine.

You will not have face any issues

Regards,

Ahmed Umair

[loren.anuszewski]

Thanks for the response Kevin.  So to reap the full benefits use LACP or active mode?  I know PAgP will not work in this case. 

[Kevin Dorrell]

I would set active on both sides. Do NOT be tempted to force "on", and keep spanning tree for safety.


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