Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

GBIC WS-G5486 Connectivity issue

Dear All,

We have a problem with the GBIC WS-G5486 regarding its connectivity with the

fiber cables as explained below:

The problem simply is that the link distance is less than 1 Km, and the

Fiber Optic cable is single-mode, i'm installing the GBIC both ends in

7206-VXR with NPE-G1 router, the status of the interface in one side is

up/up and the other end is down/down...!!! when i disconnect the cable from

the down/down side, the other end becomes down/down, which means that there

is some kind of signaling reaches that end.

Any Idea can help us to resolve this problem??

Thanks in advance...

Best regards,,

Magdy Hossein

4 REPLIES

Re: GBIC WS-G5486 Connectivity issue

Hello Magdy,

You seem to have an unidirectional link condition. I know of two reasons for that:

1) one of the fibers of the pair is broken

2) one GBIC transmitter and/or receiver is broken

Regarding option 1):

Can you swap the fibers and see whether the interface down/down swaps sides? Replace the fiber in this case.

Regarding option 2):

In case the test above reveals no change in up/up and down/down, then you might have a GBIC problem. Either the receiver on the down/down side or the transmitter on the up/up side is broken. So replace a GBIC at a time until you get the link working.

Hope this helps! Please rate all posts.

Regards, Martin

Silver

Re: GBIC WS-G5486 Connectivity issue

Madgy,

Try this interface command on both routers:

'no negotiation auto'

If that doesnt help, then you either have a faulty GBIC on one end or a bad strand of fiber.

Silver

Re: GBIC WS-G5486 Connectivity issue

Also:

Insure that you have: 'media-type gbic'

VIP Purple

Re: GBIC WS-G5486 Connectivity issue

Hello,

in addition to the other suggestions, there have been a couple of posts here lately describing exactly the same thing. I had an issue which is very similar to your while helping a client with new 3750 switches. How we eventually got it resolved was by unplugging the fiber cable, entering the command ´speed nonegotiate´, and plugging the cable back it. The interface came up after that...

Regards,

GP

160
Views
0
Helpful
4
Replies