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AR100-S, AR110-S, AR120-S, AR150-S, AR160-S, AR200-S, AR1200-S, AR2200-S, and AR3200-S V200R009 CLI-based Configuration Guide - Ethernet Switching

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Overview of MSTP

Overview of MSTP

This section describes definition and purpose of MSTP.

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 rendering the MAC address table unstable. As a result, the communication quality deteriorates, and the communication service may even be interrupted. The Spanning Tree Protocol (STP) is introduced to solve this problem.

STP refers to STP defined in IEEE 802.1D, the Rapid Spanning Tree Protocol (RSTP) defined in IEEE 802.1w, and the Multiple Spanning Tree Protocol (MSTP) defined in IEEE 802.1s.

MSTP is compatible with RSTP and STP, and RSTP is compatible with STP. Table 12-1 shows the comparison between STP, RSTP, and MSTP.

Table 12-1  Comparison between STP, RSTP, and MSTP

Spanning Tree Protocol

Characteristics

Usage Scenario

STP

  • In an STP region, a loop-free tree is generated. Broadcast storms are prevented and redundancy is achieved.
  • Route convergence is slow.

STP or RSTP is used in a scenario where all VLANs share one spanning tree. In this situation, users or services do not need to be differentiated.

RSTP

  • In an RSTP region, a loop-free tree is generated. Broadcast storms are prevented and redundancy is achieved.
  • RSTP allows fast convergence of the network topology.

MSTP

  • In an MSTP region, multiple loop-free trees are generated. Therefore, broadcast storms are prevented and redundancy is achieved.
  • MSTP achieves fast convergence of the network topology.
  • MSTP implements load balancing among VLANs. Traffic in different VLANs is transmitted along different paths.

MSTP is used in a scenario where traffic in different VLANs is forwarded through different spanning trees that are independent of each other to implement load balancing. In this situation, users or services are distinguished by using VLANs.

NOTE:

The AR111-S, AR121-S and AR151-S2 only support one loop-free tree.

Purpose

After a spanning tree protocol is configured on an Ethernet switching network, it calculates the network topology and implements the following functions to remove network loops:

  • Loop cut-off: The potential loops on the network are cut off by blocking redundant links.
  • Link redundancy: When an active path becomes faulty, a redundant link can be activated to ensure network connectivity.
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Updated: 2019-05-17

Document ID: EDOC1000174108

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