[c-nsp] GRE on Cat-4948 switch

[Geyer, Nick]

I tried this once as a 'last shot' solution for a problem I was
encountering, across gig network with sustained traffic rate over the
tunnel of around 80Mbps. CPU instantly skyrocketed and the switch cried
no more. The switch had very minimal other traffic (around 20Mbps) and
very basic config, no ACL's and all static routing with a little bit of
RIP.

Based on that first hand experience, I would say that the impact will be
a non functioning network and would highly recommend against doing it.

Regards,

Nick.

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Ian MacKinnon
Sent: Thursday, 15 January 2009 3:07 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] GRE on Cat-4948 switch

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.

thanks


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