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Configuration Guide - Ethernet Switching

S1720, S2700, S5700, and S6720 V200R012(C00 and C20)

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, and Layer 2 protocol transparent transmission.
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Setting the Network Diameter

Setting the Network Diameter


Any two terminals on a switching network are connected through a specific path along which multiple devices are located. The network diameter is the maximum number of devices between any two terminals. A larger network diameter indicates a larger network scale.

An improper network diameter may cause slow network convergence and affect communication. Setting a proper network diameter according to the network scale helps speed up network convergence.

The switch calculates the Forward Delay, Hello time, and Max-Age based on the configured network diameter. It is recommended that you set the network diameter to configure timers.


  1. Run system-view

    The system view is displayed.

  2. Run stp vlan { vlan-id1 [ to vlan-id2 ] } &<1-10> bridge-diameter diameter

    A network diameter is set.

    By default, the network diameter is 7.

    • Rapid Spanning Tree Protocol (RSTP) uses a single spanning tree instance on the entire network. As a result, performance deteriorate when the network scale grows. Therefore, the network diameter cannot be larger than 7.

    • It is recommended that all devices on a ring network use the same network diameter.

Updated: 2018-12-24

Document ID: EDOC1100038339

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