Description

When SNMPv1, SNMPv2c and SNMPv3 configurations are enabled simultaneously on the same device/server, users often ask how the SNMP agent determines which version to respond with and whether conflicts occur between versions.

Solution

We can configure SNMPv1, SNMPv2c and SNMPv3 simultaneously on the same device. Both versions can coexist without conflict because of how the SNMP protocol and agent behavior are designed.

 

  • The SRX listens for SNMP requests on UDP/161.
  • When a request arrives, the SRX checks which SNMP version the request is using.
  • It then authenticates/authorises based on that version’s configuration.
SNMP VersionWorks Simultaneously?Notes
SNMP v1✔ YesBasic, no security
SNMP v2c✔ YesCommunity‑based, no encryption
SNMP v3✔ YesAuthentication + encryption

 

Only the version used by the SNMP manager (NMS) is selected for that request.

 

Modification History

2026-02-26 : Article Created