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301

Figure 312 The STP algorithm

1. State initialization of each device.

Table 139 Initial state of each device

Device Port name

BPDU of

ort

Device A

AP1 {0, 0, 0, AP1}

AP2 {0, 0, 0, AP2}

Device B

BP1 {1, 0, 1, BP1}

BP2 {1, 0, 1, BP2}

Device C

CP1 {2, 0, 2, CP1}

CP2 {2, 0, 2, CP2}

2. BPDU comparisons on each device.

Table 140 Comparison process and result on each device

Device Comparison process

BPDU of port after

com

arison

Device A

• Port AP1 receives the configuration BPDU of Device B {1, 0,

1, BP1}. Device A finds that the configuration BPDU of the

local port {0, 0, 0, AP1} is superior to the received

configuration BPDU, and discards the received

configuration BPDU.

• Port AP2 receives the configuration BPDU of Device C {2, 0,

2, CP1}. Device A finds that the BPDU of the local port {0, 0,

0, AP2} is superior to the received configuration BPDU, and

discards the received configuration BPDU.

• Device A finds that both the root bridge and designated

bridge in the configuration BPDUs of all its ports are itself, so

it assumes itself to be the root bridge. It does not make any

change to the configuration BPDU of each port, and starts

sending out configuration BPDUs periodically.

AP1: {0, 0, 0, AP1}

AP2: {0, 0, 0, AP2}

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