SNMP Troubleshooting
Regardless of whether you are using SNMPv2c or SNMPv3, you need to be able to ping the server from the agent. If Layer 3 connectivity does not exist, the SNMP Network Management Server cannot access the information in the Management Information Base (MIB) on the agent. In addition, SNMP uses UDP port 161 for general messages and UDP port 162 for traps and informs. Therefore, if an ACL is denying these ports, SNMP communication will not occur between the NMS and the agent.
Keep the following few things in mind as you troubleshoot SNMPv2c. Refer to Example 19-7 when reviewing the following list:
Community strings must match: ...
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