If your link is down, you can trouble shot router through below mention commands. But first check you network cables from server room.

Commands:

1. #show ip route

2. #show ip bgp summary

By giving this command you can check your “Neighbors” and up time of interfaces.

3. #show ip interface brief

By giving this command you can check you interface if they are up or down. also you can check what IP is assigned to specific interface

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