Hi,
I started experiencing strange behavior between MST enabled IS-based
WS-C6503 and CATS WS-C6509.
IS 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, IS-based switch behaves properly.
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
CS 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 CS 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.
cisco-nsp mailing list cisco-nsp (AT) puck (DOT) nether.net
archive at