I believe I understand that MEC on a VSS can be Layer 2 or Layer 3. Is that correct? Is one better than the other? For simplicity, it seems a Layer 2 link might be easier. Are there pro's and con's?
MEC with VSS is layer-2:
Q. What is multichassis EtherChannel?
More info here:
thanks for the info, I've been reading from this document, too:
and it discusses Layer 2 and Layer 3 MEC. If a person had a choice between using Layer 2 or Layer 3 uplinks to a VSS, which choice would be better or is it one of those "it depends" kind of thing.
Usually when you uplink your access devices to VSS, it is layer-2 portchannel (MEC) from the access switch to both 6500 switches with SVIs on them. This eliminates VRRP, HSRP, Spanning tree etc....
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Generally, the VSS uplink would be whatever you might have used if VSS wasn't available and you are working with a single physical device. I.e. if you would have used L2, VSS uplink is likely to still be L2. If you would have used a L3, VSS uplink is likely to still be L3.