I try to connect MDS9509 to Brocade 24000. After I set MDS 9509 to interop mode 3 and disable the VC of brocade switch, brocade switch can see 9509 in topology show and fabric show. And I clear all configure related to zone,zoneset and alias in MDS 9509. So there is no zone,zoneset and alias defined in MDS. But link still can not be up due to zone merge error. The code level of 9509 is 2.1 and 24000 is 4.2.2b. Is there anyone have experience on connecting brocade switch in interop 2/3?