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SNMP v3 users are not recognized on VSX when SNMP is in VS mode Technical Level
Symptoms
  • After upgrade, the snmpwalk command fails with "snmpwalk: Unknown user name" or "snmpwalk: Timeout" errors on VSX when SNMP is in VS mode.
  • Deleting and adding the USM user again does not help
Cause

A different function writes changes to SNMP configuration file in r80.40 and R81 compared to previous versions.
In some rare scenarios, this function leads to corruption of /var/lib/net-snmp/snmpd.conf file due to multiple instances of SNMPD updating the file when running in VS mode.


Solution
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