HP 1920 Series User Manual page 194

Figure 174 STP network
As shown in
path costs of links among the three devices are 5, 10, and 4, respectively.
1.
2.
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Figure 174, the priority values of Device A, Device B, and Device C are 0, 1, and 2, and the
Device state initialization.
In Table 55, each configuration BPDU contains the following fields: root bridge ID, root path cost,
designated bridge ID, and designated port ID.
Table 55 Initial state of each device
Device
Device A
Device B
Device C
Configuration BPDUs comparison on each device.
In Table 56, each configuration BPDU contains the following fields: root bridge ID, root path cost,
designated bridge ID, and designated port ID.
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Port name
AP1
AP2
BP1
BP2
CP1
CP2
181
BPDU of port
{0, 0, 0, AP1}
{0, 0, 0, AP2}
{1, 0, 1, BP1}
{1, 0, 1, BP2}
{2, 0, 2, CP1}
{2, 0, 2, CP2}