Monitoring ISDN channel usage with SNMP

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Mar 21st, 2007
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I have a 2821 router running 12.4(3g) with a channelised E1 interface, and I want to monitor how many DS0s are in use for capacity planning purposes.

I do this with some older 3640 routers by graphing the mib object cpmActiveDS0s (. and that works just fine, but the 2821 returns an absurdly high number as follows;

snmpwalk -c community -v 2c 2821_rtr .

SNMPv2-SMI::enterprises. = Gauge32: 3615

There are only 12 channels on the system so the number 3615 is junk! Is CISCO-POP-MGMT-MIB not supported on the newer routers (2800 etc.)? If so how can we get the data that we need to manage the device effectively?

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David Stanford Wed, 03/21/2007 - 09:04
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The CISCO-POP-MGMT-MIB is not supported on the ISR's such as the 2821.

The reason being is that the CISCO-POP-MGMT-MIB was designed/intended for dial platform such as AS5xxx. It will have some support for the 26xx/36xx platforms as these platforms have dial functions as well.

The ISRs have 3-tuple representation of interfaces(slot.subslot.port), which is different from the older slot.port

indexing. The MIB does not support this 3-tuple numbering and hence you will see that ISRs don't support all objects in


You could look at the ISDN-MIB for alternate objects.


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