[c-nsp] VSS Best Practices

[Manu Chao]

Cisco Best Practice will be use PAgP if you want to like to avoid VSS dual
active scenario (better than BFD)

On Thu, Aug 6, 2009 at 1:50 AM, Ivan <cisco-nsp at itpro.co.nz> wrote:

> 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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