ISR 4300 router series copper gig interface port where Switch stack is connected become inactive when both router and Cisco switch stack are rebooted at the same time. This behavior does not happen all the time but occasionally. This problem happens in remote branches where the router and switches are not protected by a good UPS. The router does not generate any error codes and Cisco TAC may not be able to find the cause. Assume the LAN switch stack is connected to router interface Gi0/0/2.
To resolve this issue, please do the following as workaround
Conf t
int gi 0/0/2
Shut
no nego auto
no shut
Exit
int gi 0/0/2
Shut
nego auto
No shut
Exit
If the interface does not come UP, save the router config and reload the router.
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