Justin Shore wrote:
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.
Thats impossible to say without knowing what kind of traffic. If it's a
lot of small packets you will get a high PPS and thus a high overhead
which causes high CPU load. The 4948 might be able to do 100Mbit of
GRE-traffic under ideal conditions (only 1500B+ packets, etc), but
without knowing/controlling the traffic 100% it is very risky.
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.
Well, the SUP720-3BXL does GRE in hardware, so pushing 100Mbit+ on a
SUP720-3BXL shouldn't be a problem.
--
Harald Firing Karlsen
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