I have SNMP set as follows:
snmp-server community xxxxxx RO
snmp-server community xxxxx RW
But using SolarWinds NCM I can poll half of my 400 switches just fine but the other half do not respond to SNMP. I would apprecaite any thoughts!!
Configs SHOULD all be the same except for host, crypto and IP addresses.
Pretty sure you need snmp-server host configured. Try that and then add snmp-server enable traps chassis for example and see if that gets you anywhere. Then try pinging the SNMP_SERVER_IP from inside one of the non-responsive switches. If it fails then it's most likely a routing problem. Try adding snmp-server source-interface traps and snmp-server trap-source . And you can always try debug snmp sessions and/or packets.
Hope this helps.