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Configuration Guide - Ethernet Switching

S7700 and S9700 V200R012C00

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, VLAN aggregation, MUX VLAN, VLAN termination, Voice VLAN, VLAN mapping, QinQ, GVRP, VCMP, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, HVRP, and Layer 2 protocol transparent transmission.
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Overview of STP/RSTP

Overview of STP/RSTP

Definition

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 making the MAC address table unstable. As a result, network communication may encounter quality deterioration or even interruption. STP solves this problem.

Devices running STP exchange STP bridge protocol data units (BPDUs) to discover loops on the network and block some ports to prune the network into a loop-free tree network. This ensures packet processing capabilities of switches are not affected by infinite looping of packets.

STP network convergence is slow. In response, IEEE released 802.1w in 2001, which introduces RSTP. RSTP achieves faster convergence than STP.

Purpose

After a spanning tree protocol is configured on an Ethernet switching network, the protocol calculates the network topology to implement the following functions:

  • Loop prevention: The spanning tree protocol blocks redundant links to prevent potential loops on the network.
  • Link redundancy: If an active link fails and a redundant link exists, the spanning tree protocol activates the redundant link to ensure network connectivity.
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Updated: 2019-01-18

Document ID: EDOC1100038843

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