АМАТЕК AN-SGM28P24-400 [143/322] Tenth chapters

142 / 322

Tenth chapters

ERPS configuration

10.1 ERPS overview

ERPS (Ethernet Ring Protection Switching) is a ring network protection protocol

developed by ITU, also known as G.8032。It is a link layer protocol specially used in Ethernet ring

network. It can prevent the broadcast storm caused by the data loop when the Ethernet loop is

complete, and can quickly recover the communication between the nodes on the Ethernet ring

when a link is disconnected. The ERPS protocol provides a fast Ethernet ring protection

mechanism, which can quickly restore network transmission when the ring network fails, thus

ensuring high availability and high reliability of the switch under the condition of the ring network

topology。

10.2 Introduction of ERPS Technology

10.2.1 ERPS ring

ERPS rings are based on the minimization of rings, each ring must be the smallest ring,

divided into the main ring and the sub ring: the main ring is a closed ring; the ring is a non closed

ring or a closed ring; and all of them need to be configured by command。

Each ERPS ring (whether the main ring or ring) has five states: (1) Idle state: ring of each

physical link is connected to the state; (2) Protection state: the state of one or multiple physical

links open loop network; (3) Manual switch hand: change ring state; (4) Forced switch state: the

forced change ring state; (5) Pending state: intermediate state in suspense.。

10.2.2 ERPS node

The two layer switching device that joins the ERPS ring is called a node. Each node

cannot be more than two ports to join the same ERPS ring, one port is RPL port, and the other is

common ring port。

For the overall situation, the role of the nodes are divided into two types as follows: (1) the