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Configuration Guide - Ethernet Switching

CloudEngine 8800, 7800, 6800, and 5800 V200R003C00

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, MUX VLAN, 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 Maximum Number of Hops of VBST

Setting the Maximum Number of Hops of VBST

Context

On the Layer 2 network running VBST, switches send BPDUs to exchange information. A BPDU contains a time to live (TTL) field that indicates the number of remaining hops of the BPDU.
  • The TTL of a BPDU sent by the root switch is the maximum number of hops of VBST.

  • The TTL of a BPDU sent by a non-root switch is calculated according to the following formula: TTL = Maximum number of hosts - Number of hops from the root switch to the non-root switch

  • If the TTL of the BPDU received by the switch is 0, the switch discards the BPDU.

The maximum number of hops of a spanning tree determines the network scale of the spanning tree. You can set the maximum number of hops to determine the network scale of a spanning tree.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run stp max-hops hop

    The maximum number of hops of VBST is set.

    By default, the maximum number of hops of VBST is 20.

  3. Run commit

    The configuration is committed.

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Updated: 2019-05-08

Document ID: EDOC1100004351

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