D-Link DGS-6600-48TS Configuration Guide - Page 182

Volume 3-Layer 2 Configurations / Chapter 19-Ethernet Ring Protection Switching (ERPS) Chapter Overview Chapter 19 Ethernet Ring Protection Switching (ERPS) Chapter Overview The following topics are included in this chapter, please go to the topic for more detailed information: • Chapter Overview • An Introduction to ERPS • Multiple Ethernet Ring Topology • Multiple ERP instances • Multi-Ring/ladder network • Topology Change Propagation • Configuration Example • ERPS Configuration Example • Relationship with other modules • Link Monitor module • FDB module • VLAN module • Spanning Tree module • LoopBack Detection (LBD) module • LACP module • Multicast Filter Mode • Port Security module • 802.1x module • Traffic Segmentation module An Introduction to ERPS ERPS is designed for loop avoidance of ring topology and replacing the other loop protection protocol, such as STP (Spanning-Tree Protocol), and it has lower convergence time than other protocols. To achieve fault-tolerance requirement of carrier-grade networks, ERPS provides faster protection switching performance that the switch completion time for link failure shall be less than 50 ms. An Ethernet ring or ERP instance, depicted in the diagram below, is a collection of ring nodes forming a closed loop whereby each ring node is connected to two adjacent ring nodes via ring links which are bounded by ring ports. For each ERP instance, it has one identifier, called Ring-ID or instance-id, and Node ID of each ring node is its MAC Address. For each ERP instance, there are two traffic channels, R-APS (Ring-Automatic Protection Switching) controlled channel and service protected channel. R-APS controlled channel is used to transmit and receive R-APS messages which belong to certain VLAN, called R-APS controlled DGS-6600 Configuration Guide 182