RMON thresholds on 3750 & 3500 switches

Unanswered Question
Mar 23rd, 2007

I am attempting to monitor all of my switch ports for input/output errors via RMON probes that will send a trap to my HP OpenView box if the threshold is reached. I'm having trouble with the MIB, according to Cisco doc, the switches should be using the IF-MIB, in which ifInErrors should be a valid OID, so my command is:

rmon alarm 2 ifInErrors.2 10 delta rising-threshold 5 1 falling-threshold 10000 owner config

This should monitor Fa0/1 on a 3548 switch....I receive the error:

Unknown object: ifInErrors.2

I can run a MIB browser and ifInErrors.<interface-index> shows up with the correct values for the input errors, but the switches will not take the command. When I telnet to the switch and run "show snmp mib | inc ifInError" nothing shows up (it does on the switches that work). I have also tried putting in the OID . with the same result.

My guess is that this is an IOS error since my switches with a newer IOS are working fine....what is throwing me is that I have Cacti and Cricket monitoring these switches and they are graphing the errors fine.

Any ideas would be appreciated....thanks.

I have this problem too.
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Joe Clarke Fri, 03/23/2007 - 09:04

Not all MIB objects are compiled into IOS by their name (and it's inconsistent across versions of IOS). Therefore, you are safest just to use fully-qualified OIDs.

For ifInErrors, that is

jrichterkessing Fri, 03/23/2007 - 09:15

Thanks....works great. I had tried using the fully qualified OID earlier, but I think I started it with a ".". I just ran it on a 3750 and the running config shows ifEntry.14.10101.

Thanks for the help!


Im also trying to monitor interface errors on my old 3548XL's with IOS ver. 12.0.(5)WC17.

I have tried browsing the MIB: which works fine, but when i try to create an rmon alarm with the following command:

rmon alarm 1 60 delta rising-threshold 1 2 falling-threshold 0 owner MySelf

I get the error: "Alarm Creation Failure"

Anybody able to guide me how to get my rmon alarm to work ?

Joe Clarke Sun, 08/24/2008 - 08:03

You need to specify an ifIndex. For example:

rmon alarm 1 60 delta rising-threshold 1 2 falling-threshold 0 owner MySelf


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