We recently attempted an upgrade on a 4500 chassis from 12.xx to 15.2(4).
We have checked everything from scratch and the configuration is fine. We are 99% sure that we are dealing with a hardware issue, meaning that the GBIC where the optical fiber is connected (MPLS Uplink) is not recognized by the new IOS.
Before upgrade: CORE_SWITCH#sh int gi2/21 status Port Name Status Vlan Duplex Speed Type Gi2/21 ewl_mpls connected trunk full 1000 Unknown GBIC
After upgrade: CORE_SWITCH#sh int gi2/21 status Port Name Status Vlan Duplex Speed Type Gi2/21 ewl_mpls notconnect 1 full 1000 Unknown GBIC
We can see the same logs on the device before and after change: %C4K_TRANSCEIVERMAN-3-INCOMPATIBLE: Port Gi2/21: New transceiver (speed 10Gbps) is incompatible with this module But no communication is done when running the new IOS.
We have tried to force interface up but no communication. We have also tried to activate a non Cisco GBIC with: #service unsupported-transceiver and a reboot but still no traffic could be seen on the interface. We cannot see anything plugged to port 2/21 when issuing the command #show inventory
Because this port was unusable, the Switch could not communicate with the neighbors and no routes wore learned. No other alternative was found to move the MPLS uplink on a different port.
This is the GBIC plugged into port 2/21 (not Cisco):
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