[c-nsp] CatOS and MST

[Alexander Nazarenko]

Hi,

I started experiencing strange behavior between MST enabled IOS-based 
WS-C6503 and CATOS WS-C6509.

IOS configuration:

spanning-tree mst configuration
 name domain.com
 revision 27809
 instance 1 vlan 2-200
 instance 2 vlan 702, 712, 722
 instance 3 vlan 703, 713, 723
 instance 4 vlan 704, 714, 724
 instance 5 vlan 705, 715, 725
 instance 6 vlan 706, 716, 726

When TCN happens in instance 0, IOS-based switch behaves properly. Only 
proper instance MACs are flushed from mac address table.



sw-bbone0#sh spanning-tree vlan 1 detail

 MST0 is executing the mstp compatible Spanning Tree protocol
  Bridge Identifier has priority 24576, sysid 0, address 000b.45b1.26c0
  Configured hello time 2, max age 20, forward delay 15, tranmsit 
hold-count 6
  Current root has priority 8192, address 000b.45b1.2680
  Root port is 2 (GigabitEthernet1/2), cost of root path is 0
  Topology change flag not set, detected flag not set
  Number of topology changes 378 last change occurred 00:03:02 ago
          from GigabitEthernet1/2

sw-bbone#sh spanning-tree vlan 722 detail

 MST2 is executing the mstp compatible Spanning Tree protocol
  Bridge Identifier has priority 32768, sysid 2, address 000b.45b1.26c0
  Configured hello time 2, max age 20, forward delay 15, tranmsit 
hold-count 6
  Current root has priority 32770, address 000b.45b1.2640
  Root port is 135 (GigabitEthernet2/7), cost of root path is 20000
  Topology change flag not set, detected flag not set
  Number of topology changes 108 last change occurred 06:24:12 ago
          from GigabitEthernet1/2
  Times:  hold 1, topology change 35, notification 2
          hello 2, max age 20, forward delay 15
  Timers: hello 0, topology change 0, notification 0

CatOS configuration
set spantree macreduction enable
set spantree defaultcostmode long
set spantree mode mst
#spantree
set spantree mst config rollback force
set spantree mst config name domain.com revision 27809
set spantree mst 0 vlan 1,201-701,707-711,717-721,727-4094
set spantree mst 1 vlan 2-200
set spantree mst 2 vlan 702,712,722
set spantree mst 3 vlan 703,713,723
set spantree mst 4 vlan 704,714,724
set spantree mst 5 vlan 705,715,725
set spantree mst 6 vlan 706,716,726
set spantree mst config commit


When CatOS switch receives TCN for instance 0 from the trunk between 
these switches, it flushes CAM for all instances.
Could you please advise why it happens? I can't disable macreduction in 
Catos as the switch's running extended VLANs.
Maybe it's somehow related.