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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 Maximum Number of Hops in an MST Region

Setting the Maximum Number of Hops in an MST Region

Context

To communicate with each other on a Layer 2 network running MSTP, switches exchange MST BPDUs. MST BPDUs have a field that indicates the number of remaining hops.
  • The number of remaining hops in a BPDU sent by the root bridge equals the maximum number of hops.

  • The number of remaining hops in a BPDU sent by a non-root bridge equals the maximum number of hops minus the number of hops from the non-root bridge to the root bridge.

  • If a switch receives a BPDU in which the number of remaining hops is 0, the switch will discard the BPDU.

The maximum number of hops of a spanning tree in an MST region determines the network scale. The stp max-hops command can be used to set the maximum number of hops in an MST region so that the network scale of a spanning tree can be controlled.

Procedure

  1. Run system-view

    The system view is displayed.

  2. (Optional) Run stp process process-id

    The MSTP process view is displayed.

    NOTE:

    Skip this step if you perform configurations in the MSTP process 0.

  3. Run stp max-hops hop

    The maximum number of hops in an MST region is set.

    By default, the maximum number of hops of the spanning tree in an MST region is 20.

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Updated: 2019-01-18

Document ID: EDOC1100038290

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