[cisco-voip] OT 3560 LX/LH

[Madziarczyk, Jonathan]

I assume you've tried the basics:

 

1)      Made sure the send strand on side A goes into the receive port
on side B and vice versa

2)      Checked the fiber with an optical tester to get visual
confirmation that the fiber is working correctly (sometimes a chip or
dirt on the end of the connector can prevent light from passing in only
1 direction).

3)      Confirmed that it's not a problem with both the SFPs and the
3560's slots and that the SFPs are securely mounted inside the 3560.

4)      The ports on side A and B are correctly configured and not
shutdown....and you're waiting long enough that spanning-tree is
actually ready to activate the ports (it's probably not an issue with
3560s but some of the older switches would not indicate that the link
was active until spanning tree was done with it's uplink timer).

5)      Your fiber distances are within the recommended parameters.  Too
far is obviously a problem, but too close is sometimes a bigger problem.

6)      Lastly do a "show interface" to make sure the port is not
administratively down from some sort of violation (this doesn't always
show up in the port's running config and may need a shut/no shut to
resolve it).

 

Beyond that, it may require some outside assistance.

 

Let us know how it goes.

 

 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Scott Voll
Sent: Wednesday, April 15, 2009 5:51 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] OT 3560 LX/LH

 

I have two 3560's using LH sfp's with Single mode fiber.  but we just
can't get the link to come up.

 

we have switched fiber strains, we have changed sfps/ swtiches.  I'm
kind of at a loss.

 

any ideas?

 

Scott

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