GS-4210-Series (V2) User Manual

User’s Manual of GS-4210 Series
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4.6 Ring
Use the Maintenance menu items to display and configure basic configurations of The Wall-mount Managed Switch. Under
maintenance, the following topics are provided to back up, upgrade, save and restore the configuration. This section has the
following items:
■ Ring Wizard
You can quickly buld an ERPS ring by wizard.
■ ERPS You can configure ERPS ring in detail.
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 neighbor switch has one port that one port would be blocked, called neighbor port that connect to owner
port directly and this link is called the Ring Protection Link or RPL. Each switch will sends ETH-CCM message to check the
link status in the ring group. When the failure of network connection occurs, the nodes block the failed link and report the signal
failure message, the RPL owner switch will automatically unblocks the PRL to recover from the failure.