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I think your problem is related to how your connections are set up.
Here are the specs for fiber connections:
Shortwave (850 mm) GBIC using 50u cables have a maximum distance or 500 meters between end devices.
Longwave (1300 mm) GBIC using 9u cables have a maximum distance of 10 kilometers between end devices without an extender/repeater.
Using DWDM on "dark fiber" (9u cables) the distance can be extended to up to 100 kilometers between end devices.
So for you to create an extended fabric between your sites at 5Km apart, your configuration should look like this:
Host to switch=50u Multi-Mode Cable to short wave GBIC (850mm)
Switch host port uses short wave GBIC (850mm)
Switch to DWDM= 50u Multi-Mode cable to short wave GBIC (850mm)
DWDM to remote site connection=long wave GBIC (1300mm) to 9u single-mode cable (dark Fibre).
Your line cards have short wave multi-mode connections. That's fine for the local connections, but you need longwave single mode connections for the link between the sites.
You would have the same setup on the remote side. You may also need the SAN extension license for your switches as that pumps up the number of available buffer credits between the switches.
Chris
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