Description
SNMPv3 communication to devices becomes unsuccessful over time. Initial SNMPv3 communication is successful, but subsequent reads are not. This is an acknowledged problem with NAC’s SNMPv3 stack.
Symptoms include:
- L3 and/or L2 Polling failures using SNMPv3.
- Credential validation test fails for SNMP in Topology view. However, the SNMPv3 credentials have been confirmed to be correct and worked previously. A snmpwalk of the affected device from NAC CLI also works.
- Clicking the "Clear Engine ID" button does not clear the condition.
Scope
Version: 8.1.0 and lower
Solution
Workaround: Restart NAC's processes to clear the failure condition and resynchronize the SNMPv3 stack for successful SNMP communication.
Solution: Addressed in Network Sentry version 8.1.1 and higher.
