[c-nsp] Quick spanning-tree and bridge-group question

[Sam Stickland]

Guys,

Maybe I'm going a little code-blind here.

Ports Fa0/1.161, Fa0/1.162 and Se0/0/0.10 are all members of same IEEE 
bridge-group.

The port path cost on all three interfaces is the same, but I've set the 
priority of the Serial interface port to be 144.

How come the Se0/0/0.10 is still forwarding? What am I missing?

R1#sh spanning-tree

 Bridge group 10 is executing the ieee compatible Spanning Tree protocol
  Bridge Identifier has priority 32768, address 0013.8050.b191
  Configured hello time 2, max age 20, forward delay 15
  Current root has priority 10, address 0019.aa7f.3480
  Root port is 28 (Serial0/0/0.10), cost of root path is 685
  Topology change flag not set, detected flag not set
  Number of topology changes 21 last change occurred 00:22:10 ago
          from FastEthernet0/1.161
  Times:  hold 1, topology change 35, notification 2
          hello 2, max age 20, forward delay 15
  Timers: hello 0, topology change 0, notification 0, aging 300

 Port 26 (FastEthernet0/1.161) of Bridge group 10 is blocking
   Port path cost 647, Port priority 128, Port Identifier 128.26.
   Designated root has priority 10, address 0019.aa7f.3480
   Designated bridge has priority 32929, address 0019.aab4.f700
   Designated port id is 112.3, designated path cost 76
   Timers: message age 5, forward delay 0, hold 0
   Number of transitions to forwarding state: 2
   BPDU: sent 862, received 4700

 Port 27 (FastEthernet0/1.162) of Bridge group 10 is blocking
   Port path cost 647, Port priority 128, Port Identifier 128.27.
   Designated root has priority 10, address 0019.aa7f.3480
   Designated bridge has priority 32930, address 0019.aab4.f700
   Designated port id is 112.3, designated path cost 76
   Timers: message age 6, forward delay 0, hold 0
   Number of transitions to forwarding state: 2
   BPDU: sent 862, received 4690

 Port 28 (Serial0/0/0.10) of Bridge group 10 is forwarding
   Port path cost 647, Port priority 144, Port Identifier 144.28.
   Designated root has priority 10, address 0019.aa7f.3480
   Designated bridge has priority 32768, address 0016.4699.0509
   Designated port id is 128.21, designated path cost 38
   Timers: message age 3, forward delay 0, hold 0
   Number of transitions to forwarding state: 2
   BPDU: sent 470, received 9930

Sam