Cisco WS-C3560X-24T-S switch Single strand bidirectional fiber not working

[Unnikrishnan A K]

Hi, I am trying to connect 2 3560X-24T switches using single strand bidirectional fiber with GOXS-BI5312-20D SFP module. the sfp is third party, and it is not working. the interface is not coming up also. Any one have any idea how to make it working?? I dont have any cisco make sfp module for this. Unnikrishnan

[Philip D'Ath]

Does "show inventory" recognise the SFP?

[Unnikrishnan A K]

show inventory result is as follows

NAME: "GigabitEthernet1/2", DESCR: "1000BaseLX SFP"
PID: , VID: , SN: *****************

it doesnt show the PID and VID, I believe it is because of non cisco..

[Leo Laohoo]

Could be a fault with the fibre optic cable.

[Unnikrishnan A K]

HI,

I have tested the fiber optic cable, and sure it is fine. I have another sfp for using the fiber pair. that works properly. I am using a strand from that pair for testing bidirectional sfp.

[amikat]

Hi,

My view is that for the BIDI SFP connection you would need different modules at each end, ie when using GOXS-BI5312-20D at one end you would need GOXS-BI3512-20D at the other end. These can operate in pairs with their TX/RX wavelengts swapped. Eg. GOXS-BI5312-20D TX operates at 1550nm, RX at 1310 nm, while GOXS-BI3512-20D TX operates at 1310 nm, RX at 1550 nm.

Best regards,

Antonin

[Georg Pauwen]

Hello,

on a side note, try the two commands below (I am not sure if the 3560 supports them though):

3560(config)# no errdisable detect cause gbic-invalid
3560(config)# service unsupported-transceiver

[Unnikrishnan A K]

Thanks for reply..
"service unsupported-transceiver" command not available..
not working with first command..

[Georg Pauwen]

Hello,

service unsupported-transceiver

might be a hidden command, did you type the entire line in and hit ENTER ?

[Philip D'Ath]

If you remove the SFP and plug it back in - what appears in the log?

[Unnikrishnan A K]

@amikat, I will try that..
@philip, will check it..

[Leo Laohoo · Accepted solution]

Could be a faulty optical module.

[Unnikrishnan A K]

thanks for all replies..
suspects faulty sfp. will update the post after replacing it.
~Unni

[Unnikrishnan A K]

Hi more over a solution, atleast I found that the fault is with module, and sorry for the delay in response.. This much time took to replace the faulty module... :)