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Fig. 8.16, Convergence of 802.1d network, Fig. 8.17 – Siemens S223 User Manual

Page 207: Network convergence of 802.1w (1)

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User Manual UMN:CLI
SURPASS hiD 6615 S223/S323 R1.5

A50010-Y3-C150-2-7619 207

Switch B

Switch C

BPDU Flow

ROOT

Switch D

1. New link created

2. Transmit BPDU

at listening state

3. Block to

prevent loop

Switch A

Fig. 8.16

Convergence of 802.1d Network

This is very an epochal way of preventing a loop. The matter is that communication is
disconnected during two times of BPDU Forward-delay till a port connected to switch D
and SWITCH C is blocked. Then, right after the connection, it is possible to transmit
BPDU although packet cannot be transmitted between switch A and root.

Switch B

Switch C

ROOT

Switch D

1. New link created

2. Negotiate between

Switch A and ROOT

(Traffic Blocking)

Switch A

Fig. 8.17

Network Convergence of 802.1w (1)

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