[c-nsp] Cisco 3750 - strange CPU readings

[Ed Butler - RapidSwitch]

Lukasz,

Thanks for your help. It turned out to be a relatively simple problem on my
part. I had the 3750 stack on "sdm prefer routing" which allows you 3k MAC
addresses as well as 3k IPv4 unicast routes. Looking at my arp table I have
~3200 ARP entries, although they are only coming from 1200 MAC addresses.

I changed the "sdm prefer" to desktop, and the CPU usage is back to ~10%.

It still doesn't explain the strange CPU readings, although the CPU usage is
much lower now I don't like the way things that didn't add up.

Regards,

Ed Butler
RapidSwitch Ltd
DDI: 020 7106 0731

RapidSwitch Ltd, 5th Floor, Sovereign House, 227 Marsh Wall, London, E14 9SD

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-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Lukasz Bromirski
Sent: 15 January 2006 23:54
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Cisco 3750 - strange CPU readings

Ed Butler - RapidSwitch wrote:
> Further to my last email, I've done some more digging and found this. 
> It shows the 3750 stack is in the "desktop routing"
> configuration, which allows 3,000 MAC addresses. The table including 
> dynmaic and static MAC addresses counts as 1,110. However, the thing 
> that puzzles me is the switch reports no MAC address space available.

> > c3750stack#sh sdm prefer
> >  The current template is "desktop routing" template.
> >  The selected template optimizes the resources in  the switch to 
> > support this level of features for
> >  8 routed interfaces and 1024 VLANs.
> >
> >   number of unicast mac addresses:                  3K

Is `show switch' reporting some switches in this stack as 'SDM mismatch'?
Given the number of MACs in the table it's really weird because smallest
template should get at least 2K MACs. But because Your numbers in `sh proc'
don't match, I'd be looking for trouble in some inter-stack
incompatibilities - mismatched IOS version, feature set (what models are in
the stack with what IOSes and feature sets?).

> > c3750stack#sh mac-address-table | in Total Total Mac Addresses for 
> > this criterion: 1110 c3750stack#sh mac-address-table count | in 
> > Available Total Mac Address Space Available: 0

Is any line in `show platform resource-manager mad' shows a entry with
'FREE' in mvid column? Also, try to check what stack slaves report for CPU
usage:

 remote command all show proc cpu sorted | in CPU

-- 
this space was intentionally left blank    |            Łukasz Bromirski
you can insert your favourite quote here   |        lukasz:bromirski,net
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