Here is an interesting one. Looking for ideas. We have a 6807 running VSS. On port Te2/1/32 we have several vlans on a trunk port connected to a 3750X switch port Gi1/1/1. For vlan 701 and several others the 6807 is root. Vlan 701 appears only on this port. There is an SVI for vlan 701 on the 6807. We notice in the log that int vlan 701 has been going down and then up 15 times in since the 6807 was installed. It replaced a 6509 a little over 1 week ago. So first thought is that int Te2/1/32 is having issues. Checking the port we have logging link-status and there have been no interface flaps for this port. No errors recorded on either end of the link. Yet we have this.
Port 4128 (TenGigabitEthernet2/1/32) of VLAN0701 is designated forwarding
Port path cost 4, Port priority 128, Port Identifier 128.4128.
Designated root has priority 8893, address 0200.0003.3333
Designated bridge has priority 8893, address 0200.0003.3333
Designated port id is 128.4128, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 15
Link type is point-to-point by default
BPDU: sent 371903, received 62
Port 49 (GigabitEthernet1/1/1) of VLAN0701 is root forwarding
Port path cost 3004, Port priority 128, Port Identifier 128.49.
Designated root has priority 8893, address 0200.0003.3333
Designated bridge has priority 8893, address 0200.0003.3333
Designated port id is 144.32, designated path cost 0
Timers: message age 16, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
BPDU: sent 65, received 369628
The real interesting point is that none of the other vlans have the same statistics. All have transitioned to forwarding only once.
Regards.
