H3c-technologies H3C WX6000 Series Access Controllers Uživatelský manuál stáhnout pdf (Strana 164)

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20-6

Figure 20-2 Network diagram for the STP algorithm

z Initial state of each device

The following table shows the initial state of each device.

Table 20-4 Initial state of each device

Device Port name BPDU of port

AP1 {0, 0, 0, AP1}

Device A

AP2 {0, 0, 0, AP2}

BP1

{1, 0, 1, BP1}

Device B

BP2

{1, 0, 1, BP2}

CP1

{2, 0, 2, CP1}

Device C

CP2

{2, 0, 2, CP2}

z Comparison process and result on each device

The following table shows the comparison process and result on each device.

Table 20-5 Comparison process and result on each device

Device Comparison process

BPDU of port after

comparison

Device A

z 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 configuration received message, and discards

the received configuration BPDU.

z 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.

z Device A finds that both the root bridge and designated bridge in the

configuration BPDUs of all its ports are Device A itself, so it assumes

itself to be the root bridge. In this case, 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}

1 2 ... 159 160 161 162 163 164 165 166 167 168 169 ... 677 678

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