This post is more than 5 years old
1 Rookie
•
5.7K Posts
0
1105
Problems connecting 2 Brocades over LW 9/125
I've got 3 Brocade switches per fabric, 2 on site 1 (5100 + 5100) and another one (4900) on site 2.
The two switches on site 1 are ISL'd over MM 50/125 and working fine, but the triangle connecting these two to the third switch doesn't work. Or in fact: the 9 micron LW SFP's don't see any light.
We changed patch cables, used a different line from site 1 to site 2, we set the SFP's to fixed 4Gb, but still: no light on the LW SFP's.
We have 1 Brocade 4900 and two 5100's. The 4900 has a 4Gb LW SFP and the 5100 are using 8Gb LW SFP's.
Could it be an SFP incompatibility ? Connecting the two 5100's over LW works just fine.
The distances over the two links are 330m and 580m (really close by) and we really need the 4Gb link, otherwise we'd have used 2 or 1Gb ISL's. We are using 5dB attenuators on both loinks to damp the power. We tried leaving the attenuators out and we tried stacking the attenuators (so 10dB), but nothing helps.
Does anyone have any idea why we don't get any light between the two sites ? Tips ? Things we need to look at ?
RRR
1 Rookie
1 Rookie
•
5.7K Posts
0
October 11th, 2011 12:00
it appears the problem was the fiber link between the two sites. I'm sorry I didn't update this post any sooner, but somehow I don't get email updates from every post I'm interesed in and this one slipped my mind.
So the problem is solved by using a different long distance fiber.
SKT2
2 Intern
2 Intern
•
1.3K Posts
0
September 30th, 2011 13:00
Did u make any progress with this?
felipon1
96 Posts
0
October 10th, 2011 03:00
Could you show us the output of sfpshow for the failin link?
I suppose that the better thing you can do to tshoot this issue is to put a loopback plug in each end to see if the switch can see its own signal. If the switch cannot detect its own signal, there must be a problem with the cable (or patch-panel if there is any).