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Brocade DCX Fiberchannel trunk via Cisco ONS not working

We have a SAN environment over 2 locations. On each location they placed a Brocade DCX 8510 SAN switch. The Inter site link is provided via CISCO ONS.

We use at both sites a MXP_MR_10DME card with two interfaces. We created two circuits and configured the ports at FC4G.

So when we connect the brocade switches directly to the ONS it works perfect.  We then  have 2 4GB fiberchannel connections.

However we would like to trunk these connection to a 2x 4GB channel.

On the Brocade switches we configured both interfaces connected to the ONS as Trunk.

Both switches see each other but no traffic will run over this trunk. When we disable one port of the Brocade in this trunk then traffic starts to flow.


Is it possible to create a trunk between the brocades via ONS?. ( we know that it will work with a direct fiber connection).

I know you can do trunking by using other cards but is this possible with the 1-DMEX-C cards.

So is the ONS aware of a trunk. I suppose that the ONS should be transparent.

If anybody has done did before, do we need to configure something specific on the ONS or Brocade switches..?