I suspect either a misconfiguration of your switch: ACL blocking udp 161, incomplete snmp configuration or, a firewall blocking udp 161 between your pc to switch or a problem with your NMS software, which net-snmp will clear the doubt for.
Also you need not to be in asymetrical routing the incoming snmp traffic to the switch should be using the same interface as the outgoing snmp traffic from the switch to the PC.
Ok so FYI, if this happens, this is 90% of the case due to a high cpu that the switch experienced. Usually SNMP processes are shutdown if there is a high cpu and sometimes IOS is not able to restart it right, removing and re-adding the snmp-server command fixes it.
Please monitor this. If it happens again, get the show proc cpu history and also log your syslog messages to see if anything else happened and we will investigate it.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
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