SNMP mib dll not loaded on IOS-XR 4.3.4

[robertbeumer]

Hi all,

A router running 4.3.4 would not respond to SNMP queries for optical sensors (cisco-entity-sensor-mib) when I was trying to calculate the dBm. When checking with "show snmp mib dll" I found that the dll has not been loaded:

ciscosensormib: dll=mib/libciscosensormib.dll, config=ciscosensor.mib, not loaded

Other routers that are also running 4.3.4 have loaded this dll, though. I have searched extensively but I couldn't find any documentation regarding how to load or reload mibs in IOS-XR. Can you guys help me with this?

[Aleksandar Vidakovic]

hi Robert,

this MIB should be loaded dynamically when the first poll request for an OID from that MIB is received.

You can run the "sh snmp mib statistics" command to see whether the request for OIDs in question was received. You can also check "sh snmp trace requests" to see whether packets from the management station were received.

As a workaround you may try to restart the snmpd.

If none of that helps, it might be the best to open a TAC SR.

hope this helps,

Aleksandar

[robertbeumer]

Hi Aleksandar,

The show snmp mib statistics showed no statistics for the cisco-entity-sensor-mib. If I execute sh snmp trace requests I see a lot of requests coming from the monitoring server that is also querying for this MIB. Restarting SNMP does not change anything.

It almost seems as if the processing of the request fails so the MIB is not being loaded. I think opening a SR with the TAC will be the next option.

Regards,

Robert

[Aleksandar Vidakovic]

Hi Robert,

it seems the next step would require some debugging. It's indeed best to engage our TAC at this point.

regards,

Aleksandar