I don't know if this has been asked yet but I have a couple Cisco Catalyst 4500 switches that are showing up as unknow. When I test the snmp and everything it is successful but doesn't show any interfaces. Is there something I am missing? Do I have to add some special MIB's or something?
I have a 4510 with Sup V's and it works great. I would think you have something not working quite right with SNMP. Like some how the snmp query is getting mangled in transit or the string doesn't have enough access on the 4510.