[c-nsp] C3560X Layer 3 throughput

Nick Cutting ncutting at edgetg.co.uk
Tue Feb 16 07:25:20 EST 2016

I've tested many 3650 and 3850 - they are basically line rate with no CPU hit.

I've got some in datacenters too, routing many SVI's / routed ports.

Check you are also not running features supported in XE code that should only ever be used on the XE routers i.e tunnels etc.

-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Phil Mayers
Sent: 16 February 2016 12:09
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] C3560X Layer 3 throughput

On 16/02/16 11:53, David Wilkinson wrote:
> Hi all,
> What is the real world expected throughput on the C3560X devices when 
> doing basic Layer 3 routing?

I'd expect it to be able to do line-rate with almost no CPU - it should be forwarding in hardware.

> We have a customer who has a couple of these and are doing around 
> 50-60Mpbs, around 10Kpps and is hitting around 50% CPU and we are 
> wondering if this is normal for these switches as it seems a little 
> high to us.

That seems wrong. Most likely it's forwarding in software instead of hardware, due to incorrect configuration or bugs.

Check you have the IP rather than LAN image running, that you've got an appropriate SDM template for routing, that you haven't got any unsupported features enabled, and that you aren't otherwise inducing it to punt to CPU e.g. by getting a lot of IP redirects/ICMP unreach or other such activity.
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