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D-2
Spanning Tree Operation
Spanning Tree Protocol (STP)
Spanning Tree Operation
Figure D-1. Example of Logical and Redundant Paths Between Two Nodes
node
A
switch A
node
B
switch Dswitch B switch C
1
path cost:
100
3
path cost: 100
4
path cost: 200
Active path from node A to node B: 1—> 3
Backup (redundant) path from node A to node B: 4 —> 2 —> 3
2
path cost: 100
d_ymstp.fm5 Page 2 Wednesday, March 5, 1997 4:18 PM