Specifications

Management Guide CLI

TigerAccess™ EE

SMC7824M/VSW 291

Fig. 8.29 shows an example of ERP operation when a link failure occurs.

3. Nodes detecting Link Failure

send Link Down message

Node A

Node B

2. Link Failure

Node C RM Node

Primary

Secondary

1. Secondary port of RM node is

blocking in Normal state

Unused Link for Traffic

Fig. 8.29 ERP Operation in case of Linnk Failure

After RM node receives Link Down messages from other nodes, it unblocks its secondary

port for traffic transmission with Node B directly connected to the secondary port. RM

node sends RM Link Down messages and informs the other nodes that its secondary port

begins forwarding the traffic.

Fig. 8.30 shows an example of a ring protection after a link failure.

Node A

Node B

Node C

RM Node

Sends RM Link Down Ack to both

ports and unblocks secondary port.

RM Link Down

Fig. 8.30 Ring Protection