08-13-2009 01:24 AM
Hello,
I would like to know if there is a way to validate that a SFP type 1000baseLX is working properly on catalyst 2960.
I am looking for the loop feature that is available on routers.... but not on switches.
The topology is 2 catalyst 2960 switches with both SFP type 1000baseLX connected together with a fiber. This was working find but actually, the two interfaces are down/down.
The idea is to be sure that the problem is on the fiber and not on one of the SFP....
Thank You for your help.
08-13-2009 07:25 AM
UniDirectional Link Detection (UDLD) addresses your concern regarding the fiber. See http://www.cisco.com/en/US/docs/switches/lan/catalyst2960/software/release/12.2_46_se/configuration/guide/swudld.html for more information.
For the SFPs themselves, you might want to review http://www.cisco.com/en/US/products/hw/modules/ps4999/products_tech_note09186a00807a30d6.shtml for more information.
Hope this helps.
08-13-2009 08:02 AM
You can also use hard loop means take a patchcord and connect transmitter to receiver (in LX you can connect directly but if you have a attenuator would be nice)similarly you can check your card at other end.
IF both cards are working, Now only fiber is left , you can loop the 2 fiber at other end and check whether your fiber have problems.
08-13-2009 08:36 AM
Hi,
Thank You for your updates.
That means that there is no way to perform this loop in software mode with the IOS :-(
I thought about the possibility to physically loop with a patchcord but I am afraid to break the Rx LED of the SFP.
I will have a look on the LX specification to check the minimal distance.
The UDLD will not help me in this situation because both interfaces of both sides are in down/down status.
Anyway, thank you for your updates.
Regards,
Thomas Quero
08-13-2009 10:43 AM
Hi Thomas,
U can try LAN switching board to check if anybody else knows loop in software but you can use physical loop for GLC-LH-SM (I think this is the card u have). As Max Transmit power is -3dBm and Max Receive power is also -3dBm so shd not be a problem.
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