VSS multi-chassis etherchannel question

[Colin Higgins]

I assume I can do this, but I want to check before I try and implement

I have 2 6500 series switches is a VSS environment. They are virtualized using the TenGig ports on the Sup 2Ts.

I want to trunk both switches (or the one virtual switch) to a pair of upstream 6513s that are not virtualized (just a standard setup).

The examples I have seen use a layer 3 MEC between the virtualized switches and the upstream switches, but I need to trunk vlans and do not want to use layer 3.

So on the upstream switches, I would like to set up something like this

interface port-channel 10

switchport trunk encapsulation dot1q

switchport mode trunk

mls qos trust dscp

no shut

interface range TenGigabitEthernet 12/1 -2

channel-group 10 mode desirable  no shut

and do po20 on the other switch ...

so po10 has a connection to each virtual switch, and so does po20

Any issues with this?

[Reza Sharifi · Accepted solution]

Yes, you can do this, but if you are not planning to use Layer-3, and the portchannel is just layer-2 trunk, then you can put all you 4 links in one portchannel.  There is no need to the second portchannel unless you are doing MEC (layer-3).

HTH