Link between 3750 and 4908 (Lx, monomode fiber)

[slash.bdi]

Hello,

I have a new swtich a C3750 and a 4908 works very well.

I try to link a 3750 and a 4908, my results :

- Port of 3750 and 4908 is up when I put "speed nonegociate" . And juste few packets arrive to the 4908 and I can't ping the 4908.

- Port of 3750 is up with "speed nonegociate", and the port of 4908 stays down....

- Port of 3750 and 4908 stay down without "speed nonegociate" ... :(

You can see the 3750's config in attachments.

Ps : Sorry for my english, i'm a french student :)

Thank in advance

[spremkumar]

Hi

Can you post the exact SFP code name being used on both the ends (both 3750 and 4908)?

Also are these 2 switches placed close in distance ??

regds

[slash.bdi]

The Gbic SFP on the 3750 is a Prolabs LX/LC and on the 4908 is "normal" gbic LX (I don't know the mark)

and the distance is under 1.2 miles (2 Km)

[spremkumar]

Hi

In recent past i had tried interfacing 3750 installed with LX SFP with third party SFPs installed in Lucent DSLAMs with speed nonegotiate on the cisco 3750 side.

We did face some kinda wierd problems after the lucent DSLAMs get rebooted or sometimes even we disconnect and reconnect the fiber it happened that we failed to get the link(connectivity).

So i would suggest to go for an original Cisco SFP make to avoid all these intermittent issues which can result in unecessary downtimes..

regds

[slash.bdi]

Thank you for your answer!

I belong to an student association, and we can not afford a new gbic..

Would it be other solutions, with the current material?