Raisecom
ISCOM2600G-HI (A) Series Configuration Guide
4 Ring network protection
Raisecom Proprietary and Confidential
Copyright © Raisecom Technology Co., Ltd.
4 Ring network protection
This chapter describes basic principles and configuration procedures for ring network
protection, including the following section:
G.8032
ELPS (G.8031)
4.1 G.8032
4.1.1 Introduction
G.8032 Ethernet Ring Protection Switching (ERPS) is an APS protocol based on the ITU-T
G.8032 recommendation. It is a link-layer protocol specially used in Ethernet rings. Generally,
ERPS can avoid broadcast storm caused by data loopback in Ethernet rings. When a
link/device on the Ethernet ring fails, traffic can be quickly switched to the backup link to
ensure restoring services quickly.
G.8032 uses the control VLAN on the ring network to transmit ring network control
information. Meanwhile, combining with the topology feature of the ring network, it
discovers network fault quickly and enable the backup link to restore service fast.
4.1.2 Preparing for configurations
Scenario
With development of Ethernet to telecom-grade network, voice and video multicast services
bring higher requirements on Ethernet redundant protection and fault-recovery time. The
fault-recovery time of current STP system is in second level that cannot meet requirements.
By defining different roles for nodes on a ring, G.8032 can block a loopback to avoid
broadcast storm in normal condition. Therefore, the traffic can be quickly switched to the
protection line when working lines or nodes on the ring fail. This helps eliminate the loop,
perform protection switching, and automatically recover from faults. In addition, the
switching time is shorter than 50ms.
The ISCOM2600G-HI series switch supports the single ring, intersecting ring, and tangent
ring.
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