File this one in the “idiot who knows enough to break something category”
CCNA people – take it!
From: observium [mailto:observium-bounces@observium.org]
On Behalf Of Karsten Schwarz
Sent: Tuesday, February 03, 2015 3:42 AM
To: mike@observium.org; Observium Network Observation System
Subject: Re: [Observium] An interesting issue with Cisco 2960Cs...
Hi Mike,
disabling CEF is the worst thing to do on a cisco switch.
The Problem is just type error in the polling script.
The polled OID name is _not_
CISCO-CEF-MIB::cefFIBSummaryEntry!
It is CISCO-CEF-MIB::CefFIBSummaryEntry
The Mib lists the the description as :cefFIBSummaryEntry, but the value name is CISCO-CEF-MIB::CefFIBSummaryEntry
regards
|
Karsten Schwarz |
From: Mike Stupalov <mike@observium.org>
To: Observium Network Observation System <observium@observium.org>
Date: 29.01.2015 20:39
Subject: Re: [Observium] An interesting issue with Cisco 2960Cs...
Sent by: "observium" <observium-bounces@observium.org>
Try latest revision (r6218).
For my test device (WS-C2960C-8PC-L) polling time reduced from 124.78s -> to 17.52s (without disabling any module) :)
On Thu, Jan 29, 2015 at 7:14 PM, Richard Kuhns <rjk@wintek.com> wrote:
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
Wintek Corporation Direct: 765-269-8541
427 N 6th Street Internet Support: 765-269-8503
Lafayette, IN 47901-2211 Consulting: 765-269-8504
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