It would really depend on what is being polled in those SNMP packets, and what type of device this is. A sniffer trace would shed light on the former. The most likely cause for this problem is Campus Manager User Tracking, but only if this is a switch.
The problem most likely has to do with the polling of inactive VLANs. The best way to troubleshoot this is to get a packet capture of the bad SNMP requests. This will help determine exactly which part of CM is doing the polling, and will help with fixing it.
Hi, i had the same issue, this is my storie and recomendation...
First, this snmp-auth-fail is a trap, this trap cannot be analized in CiscoWorks (neither is loged the detail that we need here), so you have to forward it to another platform (i use a linux with the trapd demon).
Then i search the log of trapd, there you will find WHO is tring to query throu SNMP your network device, and therefore WHO is the responsible of this auth-failure
If the credential are OK on the CiscoWorks, then this trap shouldnot be generated by an incorrect access of the CW, so, you have to find WHO else is trying to get the network devices.
The trap is generated when a snmp request is received by the switch with an incorrect SNMP community string. You can initiate a packet capture on the switch to check for the source of the snmpgets with an incorrect community string.
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