Alcatel-Lucent OmniSwitch AOS Release 7 Manual page 199

Configuring ERP
If a link or node failure occurs in the ring shown in the above illustration, the ring transitions as follows
into the protection mode:
•
Nodes adjacent to the failure detect and report the failure using the R-APS (SF) message.
•
The R-APS (SF) message triggers the RPL owner to unblock the RPL.
•
All nodes in the ring flush all the dynamic MAC addresses learned on their ring ports.
•
The ring is now operating in the protection mode, as shown below:
When the failed link shown in the above illustration recovers, the ring transitions as follows back to the
idle mode:
•
Nodes adjacent to the recovered link initiate an R-APS (NR) message and start the Guard Timer.
OmniSwitch AOS Release 7 Network Configuration Guide
Normal Mode
Protection Mode
March 2011
ERP Overview
page 9-5