Gig etherchannel between 3508XL and 4507R

[mifitzgerald]

Anyone out there doing this? I can get the channel to come up, but the 3508 can only seem to pass traffic on whichever link of the two in the channel comes up first. The 2nd link shows no STP running as I expect it should (based on doing this between a 3550-12G and the 4507R). The result is that I lose connectivity to half the devices attached to the 3508XL (the ones whose traffic is trying to traverse the 2nd link, I would guess).

Cisco TAC hasn't been able to help.

Mike

[roadhouse1387]

Hi Mike,

That does sound like a STP problem.

Does 'show spanning-tree blocked ports' show that any of the channel ports are blocking (at either end) ?

And 'show etherchannel port-channel' shows 2 ports in the bundle and both up ?

Thats the kind of thing i would expect to see if the channel was not operating correctly, in which case STP would block one port.

Cheers

Shaun