Siemens S223 用户手册

UMN:CLI                                                                                                                                                              User  Manual 

SURPASS hiD 6615 S223/S323 R1.5 

208                                                                         A50010-Y3-C150-2-7619 

SWITCH A negotiates with root through BPDU. To make link between SWITCH A and root, 
port state of non-edge designated port of SWITCH is changed to blocking. Although 
SWITCH A is connected to root, loop will not be created because SWITCH A is blocked to 
SWITCH Band C. In this state, BPDU form root is transmitted to SWITCH B and C 
through SWITCH A. To configure forwarding state of SWITCH A, SWITCH A negotiates 
with SWITCH B and SWITCH C. 

Switch B

Switch C

Switch D

3. Forwarding

3. Negotiate between   

Switch A and Switch C 

(Traffic Blocking)

Switch A

3. Negotiate between   

Switch A and Switch B 

(Traffic Blocking)

 

Network Convergence of 802.1w (2) 

 

SWITCH B has only edge-designated port. Edge designated does not cause loop, so it is 
defined in 802.1w to be changed to forwarding state. Therefore, SWITCH B does not 
need to block specific port to forwarding state of SWITCH A. However since SWITCH C 
has a port connected to SWITCH D, you should make blocking state of the port. 

Switch B

Switch C

Switch D

Switch A

4. Forwarding state

4. Forwarding state

4. Block to make Forwarding 
state of Switch A

 

Network Convergece of 802.1w (3)