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CSCsq36972 - Portchannel does not form. Log messages indicate misconfig.

We've just seen funny bug similar to CSCsq36972. Portchannel mistakenly treats it's member trunk port mode as dynamic. This port is not allowed to join port-channel and is suspended. But member port is actually non-dynamic.

1471768: Oct 29 2014 11:07:42.507 GMT+6: %EC-SW1_SP-5-CANNOT_BUNDLE2: Gi2/6/9 is not compatible with
 Po222 and will be suspended (trunk mode of Gi2/6/9 is dynamic, Po222 is trunk)

interface GigabitEthernet2/6/9
 switchport trunk encapsulation dot1q
 switchport mode trunk
 switchport nonegotiate
 channel-group 222 mode desirable

The differences with aforementioned bug-case are:


1 we were not using "no shut", we just physically unplugged in plugged-in cables.


2 we had Ten mixed with Gig interfaces in one Portchannel and tried to use Gig as a backup in case Ten fails.


So when Ten fails, Gig should automatically unsuspend and join Portchannel. But it was suspended for competely different reason!

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