Issue when linking ASR1001-X 1G port to ASR9001k 1G port

[CarsonDavis56998]

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..

[balaji.bandi · Accepted solution]

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

[CarsonDavis56998]

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.

[balaji.bandi]

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