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pagp dual active detection port-channel not working

codflanglers
Level 1
Level 1
I am trying to get dual active detect working on a pair of 4500-X's, but it is not working. The port-channel interfaces ard coming up as stand alone. It is between two ports with mm fibre between them. Vsl port-channel works just fine as does this one if you use lacp, but not with pagp. Port configs are the same and it only has a a 3750-x stack attached. Any ideas? All configs have been redone according to cisco docs and switches rebooted.
2 Replies 2

Reza Sharifi
Hall of Fame
Hall of Fame

How are the 4500-x connected to the stack of 3750x? If you are connecting each 4500-X to a different 3750 in a stack, PAGP is not supported. Only LACP is supported. 

HTH

Got it working by upgrading to 3.5 software, as that includes fast-hellos for dual active detect.