Siemens S323, S223 user manual Send Link Down Message, Normal Node RM Node

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

Normal Node

2. Send Link

Down Message

Fig. 8.36 Ring Protection

2. Send Link

Down Message

S

P

RM Node

1.Secondary port of RM node is changed as unblocking state

When a Link Failure is recovered, a temporary loop may occur. To rectify this condition, ERP sends a “link up” message to the RM. The RM will logically block the protected VLANs on its secondary port and generate a “RM link up” packet to make sure that all transit nodes are properly reconfigured. This completes fault restoration and the ring is back in normal state.

2. Nodes detecting Link Failure	2. Nodes detecting Link Failure
send Link Down message	send Link Down message
Normal Node	Normal Node

1.Link Failure recover blocks the port recovered from Link Failure

S

P

Normal Node RM Node

Fig. 8.37 Link Failure Recovery

266 A50010-Y3-C150-2-7619