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S9300, S9300E, and S9300X V200R012C00 Configuration Guide - Ethernet Switching

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, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, HVRP, and Layer 2 protocol transparent transmission.
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Overview of VBST

Overview of VBST

Definition

VBST, a Huawei spanning tree protocol, constructs a spanning tree in each VLAN so that traffic from different VLANs is forwarded through different spanning trees. VBST is equivalent to STP or RSTP running in each VLAN. Spanning trees in different VLANs are independent of each other.

Purpose

Currently, there are three standard spanning tree protocols: Spanning Tree Protocol (STP), Rapid Spanning Tree Protocol (RSTP), and Multiple Spanning Tree Protocol (MSTP). STP and RSTP cannot implement VLAN-based load balancing, because all the VLANs on a LAN share a spanning tree and packets in all VLANs are forwarded along this spanning tree. In addition, the blocked link does not carry any traffic, which wastes bandwidth and may cause a failure to forward packets from some VLANs. In real-world situations, MSTP is preferred because it is compatible with STP and RSTP, ensures fast convergence, and provides multiple paths to load balance traffic.

On enterprise networks, enterprise users need functions that are easy to use and maintain, whereas the configuration of MSTP multi-instance and multi-process are complex and has high requirements for engineers' skills.

To address this issue, Huawei develops VBST. VBST constructs a spanning tree in each VLAN so that traffic from different VLANs is load balanced along different spanning trees. In addition, VBST is easy to configure and maintain.

Benefits

VBST brings in the following benefits:
  • Eliminates loops.
  • Implements link multiplexing and load balancing, and therefore improves link use efficiency.
  • Reduces configuration and maintenance costs.

Comparisons Between VBST and Standard Spanning Tree Protocols

Table 15-1 lists the comparisons between VBST and STP/RSTP/MSTP.

Table 15-1  Comparisons between VBST and STP/RSTP/MSTP

Spanning Tree Protocol

Similarity

Difference

Convergence Speed

Traffic Forwarding

Usage Scenario

Complexity

VBST

Forms a loop-free tree topology to prevent broadcast storms and implement link backup.

RSTP/MSTP/VBST provides faster convergence than STP.

A spanning tree is formed in each VLAN, so that traffic from different VLANs is forwarded through different spanning trees that are independent of each other.

  • Service traffic needs to be differentiated and load balanced.
  • VBST interworks with PVST, PVST+, and Rapid PVST+.

Medium

MSTP

Provides mappings between MSTIs and VLANs so that traffic from different VLANs is forwarded through different spanning trees that are independent of each other.

Service traffic needs to be differentiated and load balanced.

High

RSTP

Maps all VLANs to one spanning tree, so traffic from all VLANs is forwarded through the same spanning tree.

Service traffic does not need to be differentiated.

Low

STP

Slowest

Low

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Updated: 2019-01-18

Document ID: EDOC1100038290

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