We have 2 6509-E's with the VS-S720-10G-3C sups. We are currently using the switches in active / standby scenario but have all the hardware necessary to turn on the VSS mode. I see many advantages in going to the VSS system but am curious what, if any, are the reasons I shouldn't or couldn't. The modules we have are the FWSM, 6 WS-X6748-GE-TX, WS-X6724-SFP and the VS-S720-10G.
The only reason I can see for enabling the VSS stuff is if you need Layer-2 services between the two 6500 chassis. The main drivers are clustering (i.e. MS Load Balancing Clusters) and VMWare (or MS Virtual Server etc). Other than that I see no benefits in using the VSS features.
Personally I wouldn't touch it as there are Layer-3 alternatives I prefer, however it makes it easy to deploy servers & clusters in the same common Layer-2 domain.
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