Hi Colin,

On 01/29/15 08:19, Colin Stubbs wrote:
> Hi Richard
>
> You're right, 2960C's are L2 only; and my understanding is the same in
> that they shouldn't be doing CEF at all.
>
> That said they're a similar hardware flavour to 2960S/3560X/3750X
> hardware, which can have L3 features enabled, so the software release in
> use probably has CEF code riddled right the way thru it.
>
> What happens when you attempt to run CEF related commands on the CLI, e.g.
>  - show cef background

This command isn't available.

>  - show platform ip unicast cef-idb

This command returns immediately with no output.

> e.g. are they available, do they return anything, does the CPU spike
> with the CLI commands too?

Nope, no CPU spike.

> The other obvious questions:
>  1) Which IOS version are you running?

We've now tested on 12.2(55)EX, 15.0(2)SE7, and 15.2(1)E3. All have the
same problem. I can use snmpbulkwalk to query
CISCO-CEF-MIB::cefFIBSummaryEntry and the SNMP ENGINE process CPU use
jumps to over 80%, and stays there for 20 to 50 seconds.

>  2) Is it the latest stable/recommended release?
>

15.0(2)SE7 is.

> -Colin
>

Hopefully this info will be useful to other Observium users. It's
definitely a Cisco problem, not an Observium problem. As long as we
remember to disable cisco-cef when installing a 2960C everything is fine.

        - Richard

--
Richard Kuhns <rjk@wintek.com>     Main Number:      765-742-8428
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