Added a single 4500 to inventory and able to see the interfaces and their status, but in the Device Inventory showing ERROR-CONNECTION for collection status. It says:
"The device connection could not be established. The device may be too busy or device reachability or line configuration may be having issues. APIC-EM will attempt to resync the device in sometime."
Start by verifying that there is connectivity. Try ssh from grapevine to the device. Is it possible to do a snmpwalk. Is cpu on the 4500 within acceptable ranges.
The router logs is as below when trying to connect from grapevine:
Jul 11 10:31:33: %SSH-3-DH_RANGE_FAIL: Client DH key range mismatch with maximum configured DH key on server
Jul 11 10:31:33: %SSH-5-SSH2_SESSION: SSH2 Session request from 172.16.69.77 (tty = 1) using crypto cipher '', hmac '' Failed
Jul 11 10:31:33: %SSH-5-SSH2_CLOSE: SSH2 Session from 172.16.69.77 (tty = 1) for user '' using crypto cipher '', hmac '' closed
Able to ssh now from grapevine. Need to add
to the /etc/ssh/ssh_config file.