GigabitEthernet port stays down

[Ed Lo]

Hi,

I'm configuring a 2911 router and I was configuring the GE ports and they always stay down even when using the no shutdown command. How do I bring them up?

Thank you

[Reza Sharifi]

Hi,

What does the port connects to?  Does the other device the the 2911 connects to support Gig?

HTH

[Ed Lo]

The router is connected to 1941w routers which also have GigabitEthernet ports.

[RyanB]

Are the interfaces down on the physical layer (down/down) or down on the data-link layer (up/down)?

[Georg Pauwen]

Hello,

not sure if somebody mentioned this already, but you need a crossover cable to connect two routers (wires 1 and 3, and 2 and 6 crossed).

Have a look at the link below:

http://www.computernetworkingnotes.com/ccna-study-guide/cabling-cisco-devices-guide.html

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[Joseph W. Doherty]

What Georg suggested as the cause of the problem, is most likely the problem.

If you don't have a cross-over cable, but you have two straight through cables and a switch (or hub) you could interconnect the routers that way too.

[Leo Laohoo]

Joe, 

ISR G2 ports are MDI/MDI-X (unless this feature is disabled by hard coding the speed & duplex).

[Joseph W. Doherty]

Ah, in that case, unless the feature has been disabled, either a cross over or straight through cable should work.

[Reza Sharifi]

OK, do you see any link light?

Have you checked/replaced the cable?