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Fat AP and Cloud AP V200R010C00 Command Reference

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
stp max-hops

stp max-hops

Function

The stp max-hops command sets the maximum hops of a spanning tree in an MST region.

The undo stp max-hops command restores the default value of the maximum hops of a spanning tree.

By default, the maximum hops in an MST region is 20.

Format

stp max-hops hop

undo stp max-hops

Parameters

Parameter Description Value
hop Specifies the maximum hops. The value ranges from 1 to 40.

Views

System view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

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.

Precautions

In an MST region, the maximum number of hops set on the root switching device in a CIST or an MSTI is the maximum number of hops in the CIST or MSTI.

Example

# Set the maximum hops in the MST region to 35.

<Huawei> system-view
[Huawei] stp max-hops 35
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Updated: 2019-11-21

Document ID: EDOC1100064352

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