[c-nsp] Maximum spannig tree instances

[David Hughes]

On 16/07/2009, at 4:48 PM, Gert Doering wrote:

> Well, of course it won't work if you use a switch that has a 64- 
> instance
> limit.  So don't...

Well, when we broke the 128 instance limit on our access layer we  
moved to MST :)  We have hundreds of vlans trunked to our ESX clusters  
so there's no access class switch from Cisco that can handle that with  
PVST.  Also, if you use blade chassis with embedded switch modules  
(IBM H-class with Cisco switches for example) you run out of STP  
instances pretty quickly. For smaller virtualisation clusters you  
could get away with *PVST but it doesn't work in our hosting  
environment.


Thanks

David
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