6506 Sup720 connectivity problem with 3500XL and 2950G

Unanswered Question
Oct 10th, 2008

Recently I upgrade one catalyst switch 6506 with 2xSUP720 and 2x WS-X6724-SFP with LH SFP modules .

The problem is when disconnecting the optical links with the 3500XL and 2950G that was previously connected to the 6506 via an old WS-X6416-GBIC card with GBIC LH modules and connecting them to the new WS-X6724-SFP card there is no link between them .

Both the old ports on the WS-X6416-GBIC and new ones on the WS-X6724-SFP have the same trunk configuration and encapsulation.

Any help ?

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glen.grant Fri, 10/10/2008 - 14:51

I assume that you tried reversing the fiber pairs . The new fiber module came up ok when inserted ? If its a different module did you clear the config on that module when you inserted the new card and reconfigure it ? Besides that not sure what else it would be

kpap Sun, 10/12/2008 - 22:21

Of course I try to reverse the fiber pairs first, the weird about this is that the old GBIC WS-G5486 can communicate but the new SFP 1000BASE-LX/LH don't.

Giuseppe Larosa Mon, 10/13/2008 - 13:00

Hello Constantino,

you are using also new fibers because SFP have smaller connectors LC not SC as the GBIC.

have you verified if these fibers are single mode ?

Or it is the same type of other fibers you are already using : joining MM with SM cables can be a problem.



Sorry for the basic question but this is something to be checked

Hope to help



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