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AR100-S, AR110-S, AR120-S, AR150-S, AR160-S, AR200-S, AR1200-S, AR2200-S, and AR3200-S V200R009 CLI-based Configuration Guide - Ethernet Switching

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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

Switching devices on a Layer 2 network running MSTP communicate with each other by exchanging MST BPDUs. An MST BPDU has a field that indicates the number of remaining hops.
  • The number of remaining hops in a BPDU sent by the root switching device equals the maximum number of hops.

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

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

Therefore, 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 domain so that the network scale of a spanning tree can be controlled.

Procedure

  1. Run system-view

    The system view is displayed.

  2. 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: 2019-05-17

Document ID: EDOC1000174108

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