Funny: Turns out that the SNMP string hadn't been updated, as we'd been assuming. The wildcard ranges were off, and we were being bitten. Makes sense now.
I've got a large number of unassociated phones that CER seems to be having trouble locating.
It's throwing a lot of "Failed to retrieve SysOid of a device XXXX" errors.
The obvious thing to check would be that the device is SNMP reachable- which it is. If we install snmpwalk on the CER server, I can "snmpwalk -c <community> <devicename> system" and get the following:
SNMPv2-MIB::sysDescr.0 = STRING: Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 12.2(37)SE, RELEASE SOFTWARE (fc2)
We're using non-public strings, and that's been updated in the CER.
Is there anything else I'd need to check?
Are there any prerequisites required to get it to respond properly- does CER maybe just not recognize this SysOID as a valid one?