SNMP ifmib ifindex values

[Richard Pidcock]

I have an ISR4331/K9 reporting incorrect ifindex values.

RTR-003-4331-01#show snmp mib ifmib ifindex Gi0/0/0
Interface = GigabitEthernet0/0/0, Ifindex = 1
RTR-003-4331-01#

Clearly the index values is 1, however my Netflow tools is discovering this as ifindex 16 which is a LAN side subinterface.

Has anyone seen this?  Recommendations?  Gi0/0/0 is a fixed port; reload the router?  It's only been up 16 weeks; thoughts?

[Mark Elsen]

      - Recommendations are to check the current software version and use the latest advisory release , if applicable , especially if you are currently on an older version , (check if that helps)

  M.

[Georg Pauwen]

Hello,

odd indeed. What if you configure 'snmp ifindex persist' on that interface ?

[Richard Pidcock]

I think I'm going to run a code upgrade on this device tonight and then I'll report back tomorrow to let you all know if any differences after upgrade and a reload.  Thanks

[MHM Cisco World]

RTR-003-4331-01#show snmp mib ifmib ifindex Gi0/0/0.1

Use subinterface to see ifindex' netflow detect interface pass traffic in case you config subinterface then it can subinterface detect traffic pass not main interface

MHM

[Richard Pidcock]

It seems to be discovering an interface with index value 16, which is one of my wireless client device LAN subnets.  Accordingly the traffic I see under netflow stats align with that wireless subnet.  This is very strange indeed.

[Richard Pidcock]

So I ran a code upgrade (Version 17.9.4a), still no good.  I'm going to reach out to the vendor of my NetFlow monitor tomorrow and see what they have to say.

[Richard Pidcock]

So it turns out that this problem was caused by a nuance within the monitoring solution software (Manage Engine OP Manager).  It was holding on to some stale data in a database that was causing the weird issues with snmp ifindex values.  Thanks to all, now I've got my issue resolved.