SNR S2989G-24TX-UPS — обзор протокола MRPP для защиты Ethernet-колец [412/553]

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S2989G-24TX Operation Manual

Chapter 7 Reliability Configuration

7-13

7.2

MRPP

7.2.1

Introduction to MRPP

MRPP (Multi-layer Ring Protection Protocol), is a link layer protocol applied on

Ethernet loop protection. It can avoid broadcast storm caused by data loop on Ethernet

ring, and restore communication among every node on ring network when the Ethernet

ring has a break link. MRPP is the expansion of EAPS (Ethernet link automatic protection

protocol).

MRPP protocol is similar to STP protocol on function, MRPP has below characters,

compare to STP protocol:

<1> MRPP specifically uses to Ethernet ring topology

<2> fast convergence, less than 1 s. ideally it can reach 100-50 ms.

7.2.1.1 Conception Introduction

SWITCH A SWITCH B

SWITCH F

Master

Node

SWITCH E

Ring 1 Ring 2

SWITCH G

SWITCH C

SWITCH D

Master Node

SWITCH H

Figure 7-6 MRPP Sketch Map

1. Control VLAN

Control VLAN is a virtual VLAN, only used to identify MRPP protocol packet

transferred in the link. To avoid confusion with other configured VLAN, avoids configuring

control VLAN ID to be the same with other configured VLAN ID. The different MRPP ring

should configure the different control VLAN ID.

2. Ethernet Ring (MRPP Ring)

Ring linked Ethernet network topology.

Each MRPP ring has two states.

Health state: The whole ring net work physical link is connected.

Break state: one or a few physical link break in ring network