Brocade VDX running rpvst with other switch even Brocade other switch needs some special configuration,otherwise, there will be two root bridage in the network.ide
switch(config)# interface tengigabitethernet 0/12 this port is uplinked to other switch.this
switch(conf-if-te-0/12)# spanning-tree bpdu-mac 0100.0ccc.cccdspa