Fig. 8.31 Link Failure Recovery; Fig. 8.32 Ring Recovery - SMC Networks 7824M/VSW - annexe 1 Manual

CLI
292
If Node A and Node B detect the link failure being recovered, they send Link Up message
to RM node. But these nodes keep the blocking status of the link recovered ports.
Fig. 8.31 shows an example of a Link Failure Recovery operation.
2. Nodes adjacent to old failure
send Link Up message to RM node
Node A
1. Link Failure recovered
Node C
Fig. 8.31 Link Failure Recovery
After RM node receives Link Up message, it blocks its own secondary port. RM node
sends RM Link UP message that informs other nodes the blocking status of secondary
port. If the nodes receives RM Link Up message, they unblocks the ports which are de-
tected a Link Failure recovery. The Ethernet ring is back to normal state.
Fig. 8.32 shows an example of a Ring Recovery operation.
Node A
2. Unblock the port
recovered from Link
Failure
RM Link Up
Node C
Fig. 8.32 Ring Recovery
Node B
S
P
RM Node
Node B
RM Link Up
S
P
RM Node
1. Sends RM Link Up Ack to both
ports and blocks secondary port
Management Guide
TigerAccess™ EE
SMC7824M/VSW