User’s Manual of IGS-604HPT-M12
351
4.20 Ring
ITU-T G.8032 Ethernet Ring protection switching (ERPS) is a link layer protocol applied on Ethernet loop protection to
provide sub-50ms protection and recovery switching for Ethernet traffic in a ring topology.
ERPS provides a faster redundant recovery than Spanning Tree topology. The action is similar to STP or RSTP, but the
algorithms between them are not the same. In the Ring topology, every switch should be enabled with Ring function and two
ports should be assigned as the member ports in the ERPS. Only one switch in the Ring group would be set as the RPL owner
switch that one port would be blocked, called owner port, and PRL neighbour switch has one port that one port would be
blocked, called neighbour port that connect to owner port directly and this link is called the Ring Protection Link or RPL.
Each switch will send ETH-CCM message to check the link status in the ring group. When the failure of network connection
occurs, the nodes will block the failed link and report the signal failure message; the RPL owner switch will automatically
unblock the PRL to recover from the failure.
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