04-02-2024 08:25 AM
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?
04-02-2024 09:50 AM
- 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.
04-02-2024 11:12 AM
Hello,
odd indeed. What if you configure 'snmp ifindex persist' on that interface ?
04-02-2024 11:51 AM
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
04-02-2024 12:23 PM
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
04-02-2024 02:28 PM
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.
04-02-2024 07:13 PM
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.
04-04-2024 05:49 AM
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.
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