Spanning-Tree between Cisco and Brocade

We're currently doing a migration from Cisco to Brocade and there seems to be a spanning tree issue whenever the two are linked together.

​

We still have some servers running on the old Cisco equipment and they need to be up until they are migrated over. The old 6509 cores are only passing a single vlan over to the new cores but whenever we plug the two together the entire network goes down. It seems like they are fighting to become the root bridge and its sending so many packets there's just not enough hardware to handle it. The logs only show the port going up and down and then the spanning tree states.

​

If any one has any tips for troubleshooting it would be greatly appreciated.

​

Mar 23 12:19:54:I:STP: VLAN 700 Port 2/1/47 STP State -> DISABLED (PortDown)

Mar 23 12:19:54:I:STP: VLAN 700 Port 2/1/47 STP State -> BLOCKING (DOT1wTransition)

Mar 23 12:19:54:I:STP: VLAN 700 Port 2/1/47 STP State -> FORWARDING (PortDown)

Mar 23 11:53:21:I:STP: VLAN 700 Port 2/1/47 Bridge TC Event (DOT1wTransition)

Mar 23 11:53:21:I:STP: VLAN 700 Port 2/1/47 STP State -> FORWARDING (DOT1wTransition)

Mar 23 11:53:21:I:STP: VLAN 700 Port 2/1/47 STP State -> LEARNING (DOT1wTransition)

Mar 23 11:53:18:I:STP: VLAN 700 Port 2/1/47 STP State -> BLOCKING (DOT1wTransition)

Mar 23 11:53:18:I:STP: VLAN 700 Port 2/1/47 STP State -> DISABLED (PortDown)

Mar 23 11:53:18:I:STP: VLAN 700 Port 2/1/47 STP State -> BLOCKING (DOT1wTransition)

Mar 23 11:53:18:I:STP: VLAN 700 Port 2/1/47 STP State -> FORWARDING (PortDown)

Mar 23 11:53:13:I:STP: VLAN 700 Port 2/1/47 Bridge TC Event (DOT1wTransition)

Mar 23 11:53:13:I:STP: VLAN 700 Port 2/1/47 STP State -> FORWARDING (DOT1wTransition)

Mar 23 11:53:13:I:STP: VLAN 700 Port 2/1/47 STP State -> LEARNING (DOT1wTransition)

Mar 23 11:53:10:I:STP: VLAN 700 Port 2/1/47 STP State -> BLOCKING (DOT1wTransition)

Mar 23 03:00:13:I:STP: VLAN 700 Port 2/1/47 STP State -> DISABLED (PortDown)

Mar 23 03:00:13:I:STP: VLAN 700 Port 2/1/47 STP State -> BLOCKING (DOT1wTransition)

Mar 23 03:00:13:I:STP: VLAN 700 Port 2/1/47 STP State -> FORWARDING (PortDown)

​