Siemens S323, S223 user manual Network Convergece of 802.1w 208 A50010-Y3-C150-2-7619

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

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.

ROOT

3. Forwarding

Switch A

3.Negotiate between Switch A and Switch B

(Traffic Blocking)

Switch B

3.Negotiate between Switch A and Switch C

(Traffic Blocking)

Switch C

Switch D

Fig. 8.18 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.

ROOT

Switch A

4. Forwarding state 4. Forwarding state

Switch B

Switch C

4. Block to make Forwarding state of Switch A

Switch D

Fig. 8.19 Network Convergece of 802.1w (3)

208 A50010-Y3-C150-2-7619