It seems to match the what I am seeing the fix is unclear. Other than changing my trunking mode so that there is no negotiation going on on both the physical ports and the port-channel, is there anything else to try? I am running 12.2(40)SG on a 4500
Are the two blades the same type? If not, then there might be an issue with capabilities.
In any case, the config of the physical ports should match before you can join them. By the look of it, Po1 has no switchport trunk encapsulation command because the ports of card 4 support only dot1q. In that case, if card 3 supports both, then you should tie down the interface on card 3 to switchport trunk encapsulation dot1q so that at least they are talking the same language.
If the cards are different, you might even find you have to switchport nonegotiate on both cards before they will cooperate.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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