i have an small issue with etherchannel, when i create a port-channel in a VSS c6506, the main Po goes down and create another one in parallel with the letter A
Port-channel132 unassigned YES unset down down
Port-channel132A unassigned YES unset up up
132 Po132(SD) LACP
132 Po132A(SU) LACP Gi1/9/12(P) Gi2/9/12(P)
so my question is, why this duplicate Po ? i know if there is a mismatch between 2 ports, it will create a second port-channel, but here, the two ports are in the same Po but not in the main Po... if i shut this Po, it will renegociate the Po, sometimes the main Po becomes up, and sometimes no.
i read the Cisco document about the port-channel, but there is no explanation for this comportment. anyone can explain this?