[c-nsp] GRE on Cat-4948 switch

[Justin Shore]

Ian MacKinnon wrote:
> Hi All,
> 
> Does anybody have any idea the impact of running multiple GRE tunnels on 
> a 4948 switch?
> 
> I can see that it will be processed by software rather than hardware, 
> but just how much of a problem is this likely to be?
> 
> I am only talking about a max of 100M of GRE traffic, amongst a couple 
> of Gig of total traffic.

I think one of the actual cisco.com guys would have to speak up to 
answer this question properly with figures on CPU speed, processing 
times, etc.  I would say with an off-the-cuff figure is that process 
switching 100M would swamp most CPUs that Cisco has on the market.  I'm 
fairly confident that our Sup720-3BXLs wouldn't take kindly to it.  The 
experts would probably have a better answer for you though.

Justin