tc-protection threshold

Function

The tc-protection threshold command sets the maximum number of topology change notification messages that can be processed during the topology change protection interval.

The undo tc-protection threshold command restores the default maximum number of topology change notification messages that can be processed during the topology change protection interval.

By default, an ERPS ring processes three topology change notification messages during the topology change protection interval.

Format

tc-protection threshold threshold-value

undo tc-protection threshold

Parameters

Parameter	Description	Value
threshold-value	Specifies the maximum number of TC BPDUs that a device processes within a specified period.	The value is an integer ranging from 1 to 255.

Parameter

Description

Value

threshold-value

Specifies the maximum number of TC BPDUs that a device processes within a specified period.

The value is an integer ranging from 1 to 255.

Views

ERPS ring view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
erps	write

Usage Guidelines

Usage Scenario

After a device on an ERPS ring network receives topology change notification messages, the device updates MAC and ARP entries. However, frequent updates will cause a high CPU usage.
To prevent frequent MAC and ARP entry updates, run the tc-protection threshold command to set the maximum number of topology change notification messages that can be processed during the topology change protection interval specified in the tc-protection interval command. Then, during the topology change protection interval, the device processes only the specified maximum number of topology change notification messages. If there are excess messages, the device processes all the excess messages for once after the topology change protection interval elapses. For example, if the time is set to 10 seconds and the maximum number is set to 5, when a device receives topology change notification messages, the device processes only the first 5 topology change notification messages within 10 seconds and processes the subsequent topology change notification messages only after the time elapses. This prevents the device from frequently deleting MAC and ARP entries.

Prerequisites

ERPSv2 has been specified using the version v2 command.

Example

# Specify the maximum number of topology change notification messages that ERPS ring 5 can process during the topology change protection interval to 5.

<HUAWEI> system-view
[~HUAWEI] erps ring 5
[*HUAWEI-erps-ring5] tc-protection threshold 5