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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).
display stp topology-change

display stp topology-change

Function

The display stp topology-change command displays the statistics about MSTP topology changes.

Format

display stp [ instance instance-id ] topology-change

Parameters

Parameter Description Value
instance instance-id

Displays statistics about the topology changes of a specified STP instance.

If this parameter is not specified, the statistics about the topology changes of a CIST instance are displayed.

The value is an integer ranging from 0 to 4094. Value 0 refers to CIST.

Views

All views

Default Level

1: Monitoring level

Usage Guidelines

Usage Scenario

On a Layer 2 network running MSTP, a device clears ARP entries and MAC entries after receiving topology change packets. If a device receives too many topology change packets, the device will frequently clear ARP entries and MAC entries, causing high CPU usage. As a result, network traffic is instable.

The display stp topology-change command can be used to display the statistics about MSTP topology changes. If the statistics increase, network flapping occurs.

Example

# Display statistics about MSTP topology changes.

<Huawei> display stp topology-change
 CIST topology change information                                               
   Number of topology changes             :173
   Time since last topology change        :0 days 0h:1m:15s
   Topology change initiator(notified)    :GigabitEthernet0/0/1
   Topology change last received from     :5489-9876-b7d7
   Number of generated topologychange traps :   1
   Number of suppressed topologychange traps:   0
Table 6-27  Description of the display stp topology-change command output

Item

Description

Number of topology changes

Total number of topology changes since MSTP initialization.

Time since last topology change

Time since the last topology change

Topology change initiator(notified)

Interface that initiates a topology change because the interface status changes to detected

Topology change last received from

Source bridge MAC address contained in a topology change packet

Number of generated topologychange traps

Total number of generated topology-change traps.

Number of suppressed topologychange traps

Total number of suppressed topology-change traps.

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Updated: 2019-11-21

Document ID: EDOC1100064352

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