H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 55)

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Figure 11 Network diagram for the STP algorithm
As shown in Figure 11 , the priority values of Device A, Device B, and Device C are 0, 1, and 2, and the
path costs of links among the three devices are 5, 10, and 4 respectively.
4. Initial state of each device
Table 10 Initial state of each device
Device Port name Configuration BPDU on the port
Device A
Port A1 {0, 0, 0, Port A1}
Port A2 {0, 0, 0, Port A2}
Device B
Port B1 {1, 0, 1, Port B1}
Port B2 {1, 0, 1, Port B2}
Device C
Port C1 {2, 0, 2, Port C1}
Port C2 {2, 0, 2, Port C2}
NOTE:
In Table 10 , each configuration BPDU contains the following fields: root bridge ID, root path cost,
designated bridge ID, and designated port ID.
5. Comparison process and result on each device