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Solved

Fiber Issue

Posted on 2010-01-11
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Medium Priority
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Last Modified: 2013-11-21
We are putting up a new building and have run fiber between the new and the old.  I have a Cisco 2821 with a fiber interface and a GBIC at one end and a HP2848 with a GBIC at the other end.  Both are set to 1000DX.  We can't get the connection to come up.  We get line protocol down on the Cisco side and the GBIC interface is down on the other side.  We have a seperate network of fiber that goes between the buildings(Our test network) that goes from HP GBIC in a 2848 to a HP GBIC in a 2848 and that works fine.  We are using the router on the first network because we are trying to ties two subnets together.  Happy to supply router config if needed.
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Question by:aek333
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14 Comments
 
LVL 16

Expert Comment

by:memo_tnt
ID: 26285927
hi

please send configuration and a sketch for network diagram connections ..
plus send (sh ip int br)  from the cisco router ..


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LVL 17

Expert Comment

by:jburgaard
ID: 26286115
Did you try in one end to swap the 2fibers going to GBIC in order to test if you have RX-RX & TX-TX instead of the wanted RX-TX & TX-RX connections?
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Author Comment

by:aek333
ID: 26294776
Yes we tried switching the fibers in the gbic.  Attached are the two files requested
fiber.txt
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Author Comment

by:aek333
ID: 26294799
Second file with diagram
Fiber.pdf
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Author Comment

by:aek333
ID: 26294851
configuration upload
config-1821.txt
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LVL 16

Expert Comment

by:memo_tnt
ID: 26296381
add this to the interface connected to the fiber ///

interface GigabitEthernet0/0/0
encapsulation dot1q 1 native


0
 

Author Comment

by:aek333
ID: 26296578
Got an unrecognized command


207Router(config)#int gigabitethernet0/0/0
207Router(config-if)#encapsulation ?
% Unrecognized command
207Router(config-if)#encapsulation?
% Unrecognized command
207Router(config-if)#encapsulation dot1q 1 native
                                   ^
% Invalid input detected at '^' marker.
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LVL 16

Expert Comment

by:memo_tnt
ID: 26296973
try this

interface GigabitEthernet0/0/0
speed 1000

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Author Comment

by:aek333
ID: 26297311
The speed command is not available on the fiber interface.  I think that is because 1000 is the only option.
0
 
LVL 16

Expert Comment

by:memo_tnt
ID: 26297468
use
speed nonegotiate


also
try this

media-type sfp
0
 

Author Comment

by:aek333
ID: 26297798
No media-type or speed commands available on the fiber interface.
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Author Comment

by:aek333
ID: 26297850
However I did find a no negotiation auto which I added to no effect.  I ordered another gbic to see if that is the issue, because everything else seems to work.
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LVL 16

Expert Comment

by:memo_tnt
ID: 26559594
Hi
 
 please update status regarding this issue ..
 
 is it solved ??
0
 

Accepted Solution

by:
aek333 earned 0 total points
ID: 29833920
Issue was solved, but none of the solutions that were proposed here worked.  It ended up being a faulty GBIC connector
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