05-16-2022 11:50 AM - edited 05-16-2022 11:51 AM
I am having a issue when linking two routers together. 9k and 1k is using a GLC-SX-MMD SFP’s and connected via a OM4 MMF fiber cable. Both routers seem to be compatible with the sfps, however when connecting the two routers the 9k goes in a UP/UP state however the 1k stays in a DOWN/DOWN state. I would not doubt if there is something small or dumb that I am not doing..
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05-16-2022 12:05 PM
I would check the fiber Light, make sure they are right, and check the patch cables, is that good.
is this your own Fibre or Provided by Provider Link ?
all Physical stuff checked then try interface command - speed nonegotiate
05-16-2022 12:05 PM
I would check the fiber Light, make sure they are right, and check the patch cables, is that good.
is this your own Fibre or Provided by Provider Link ?
all Physical stuff checked then try interface command - speed nonegotiate
05-16-2022 12:50 PM - edited 05-16-2022 12:53 PM
The fiber is my own fiber. Its a brand new fiber patch cable. I have even tried another OM4 patch cable and it still did not work. If I remove the patch cable from the 1001-X side I see the led light down the cable. I will try to implement “speed nonegotiation” when I get access to the router again and will let you know how it goes. Thanks.
05-16-2022 11:34 PM
When you remove the cable the Port goes down, Look for Light signal Looping
Twist the Fibre and test it example : ( after negotiation command still not working)
Original :
A-A
B-B
To
A-B
B-A
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