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AR500, AR510, and AR530 V200R007 CLI-based Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring transparent bridge, MAC table, link aggregation, VLANs, STP/RSTP/MSTP, and so on.The document provides the configuration procedures and configuration examples to illustrate the service configuration methods and application scenario.
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Introduction to SEP

Introduction to SEP

Definition

The Smart Ethernet Protection (SEP) protocol is a ring network protocol specially used for the Ethernet link layer. A SEP segment consists of interconnected Layer 2 switching devices configured with the same SEP segment ID and control VLAN ID. A SEP segment is the basic unit for SEP.

Purpose

Generally, redundant links are used on an Ethernet switching network to provide link backup and enhance network reliability. The use of redundant links, however, may produce loops, causing broadcast storms and rendering the MAC address table unstable. As a result, communication quality deteriorates, and services may even be interrupted. To solve the loop problem, Huawei datacom devices support the following ring network protocols:
  • STP/RSTP/MSTP

    STP, RSTP, and MSTP are standard protocols for breaking loops on Ethernet networks. They are mature and widely used. Huawei devices running STP, RSTP, or MSTP can communicate with non-Huawei devices. Networks running these protocols converge slowly (in seconds), failing to meet transmission requirements of some real-time services. The convergence time is affected by the network topology.

Huawei developed SEP to overcome the disadvantages of the preceding ring network protocols. SEP has the following advantages:
  • Applies to diverse complex networks and supports all topologies and network topology query. For example, a network running SEP can connect to a network running STP, RSTP, or MSTP.

    Network topology display helps locate blocked interfaces quickly. When a fault occurs, SEP can quickly locate the fault, improving network maintainability.

  • Allows selectively interface blocking, which effectively implements traffic load balancing.
  • Prevents traffic from being switched back after link recovery, which improves network stability.
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Updated: 2019-05-25

Document ID: EDOC1000097279

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