Apologies I pasted some info where the path costs didn't total up to be
the same. Here's the correct one.
The total path cost is 723 on every interface, the port priority on the
Serial interface is higher.
The only logical conclusion appears to be that it's comparing the bridge
IDs before the port priority? Isn't this supposed to be the other way
around?
Sam
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 723
Topology change flag not set, detected flag not set
Number of topology changes 23 last change occurred 00:05:20 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 863, received 5326
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 5314
Port 28 (Serial0/0/0.10) of Bridge group 10 is forwarding
Port path cost 685, 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: 3
BPDU: sent 471, received 11176
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