Link g0/0/0 is always down

[ameno]

The g0/0/0 of both router 1 and 2 link are always down even if I use the no shutdown command. Could someone help me with this ? Thanks

[Joseph W. Doherty]

Lots of possible reasons, especially those tied to whether there's an active device connected.

Didn't you have an Packet Tracer attachment before your revision?

[Richard Burts]

Joseph asks a very good question. If this is using real equipment it points to one set of possible issues. But if it is an emulator it point to very different possible issues.

[Georg Pauwen · Accepted solution]

Hello, 

as @Richard Burts and @Joseph W. Doherty mentioned, if this is a Packet Tracer project, and if you are using e.g. the 4331 router, the only way to get a third (working) GigabitEthernet interface is to add a GLC-T in the lower right slot on the 'Physical' tab. If you have the project file, post it here...