Cisco VSS best practice document states
Recommendations
* Always run L2 or L3 MEC.
* Do not use on and off options with PAgP or LACP or Trunk
protocol negotiation.
o PAgP Run Desirable-Desirable with MEC links.
o LACP Run Active-Active with MEC links.
o Trunk Run Desirable-Desirable with MEC links.
http://www.cisco.com/en/US/products/ps9336/products_tech_note09186a0080a7c837.shtml
There is not really any explanation of the reasoning behind these
recommendations. If anyone can explain the rational that would be great.
I would also be interested to hear what settings people are using in
production, why and how that is going.
Generally in non VSS setups I have found setting links explicitly to trunk
mode and as etherchannel members has been reliable and would like to
understand why they are not recommended above.
Thanks
Ivan
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