Configuring ERP ERP Overview
OmniSwitch AOS Release 6 Network Configuration Guide September 2009 page 14-5
Normal Mode
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:
Protection Mode
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.
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