VSS + MEC -- dynamic clone of port-channel config?
Just doing some digging here, but can't find any reference to it in any of the docs.
We have a few paris of VSS running, and having brought the down-stream access-switches online using MEC we note that the active port-channel that they bind under isn't actually the one configured, but rather a CLONE of the configured one which appears to be dynamically generated.
In our case, all ports and port-channel configurations are set to dot1q encapsulation and trunk mode active.
For example, we have a 3560 MEC'd to the VSS:
the MEC comes up, but under a slightly different port-channel identifier:
#sh int po1 | i Member Members in this channel: Gi0/49 Gi0/50 Gi0/51 Gi0/52
Here's the VSS side:
Po11 CISCO C3560 A01 notconnect 1 auto auto Po11A connected trunk a-full a-1000
#sh int po11A | i Member Members in this channel: Gi1/1/33 Gi1/1/34 Gi2/1/41 Gi2/1/42
#sh cdp nei | i hacc01-d hacc01-d Gig 2/1/42 140 S I WS-C3560G Gig 0/50 hacc01-d Gig 2/1/41 140 S I WS-C3560G Gig 0/49 hacc01-d Gig 1/1/34 161 S I WS-C3560G Gig 0/52
hacc01-d Gig 1/1/33 161 S | WS-C3560G Gig 0/51
Essentially, for all of the MEC connections, the VSS has created a clone of the configured port-channel to bind the actual physical connections, rather than binding them under the configured port-channel (and suffixed the port-channel number with A or B depending on which chassis was first to bind).
I'm not overly worried about it since the MEC is working with the dynamically generated port-channel, and traffic is flowing correctly... just curious as to why it uses a clone of the configured port-channel, rather than the actual configured port-channel itself. Just find that a bit strange.
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