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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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Setting the VBST Timeout Interval

Setting the VBST Timeout Interval


The timeout interval of the switch is calculated through the following formula:
  • Timeout interval = Hello time x 3 x Timer factor

On a network running VBST, when the network topology becomes stable, the non-root-bridge switch forwards BPDUs sent by the root bridge to neighboring switches at an interval of Hello time to check whether links are faulty. If the switch does not receive any BPDU from the upstream device within the timeout interval, the switch considers that the upstream device fails and recalculates the spanning tree.

Sometimes, the switch may not receive BPDUs in a long time from the upstream device because the upstream device is very busy. In this case, the device should not recalculate its spanning tree. Therefore, you can set a long timeout interval for the device on a stable network to reduce waste of network resources.


  1. Run system-view

    The system view is displayed.

  2. Run stp timer-factor factor

    The timeout interval for the switch to wait for BPDUs from the upstream device is set.

    By default, the timeout interval is 9 times the value of Hello time.

Updated: 2019-01-18

Document ID: EDOC1100038290

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