metric-delay suppress

Function

The metric-delay suppress command configures suppression parameters for delay information advertisement.

The undo metric-delay suppress command restores the default configuration.

By default, the suppression of delay information advertisement is enabled.

Format

metric-delay suppress timer time-value percent-threshold percent-value absolute-threshold absolute-value

undo metric-delay suppress

Parameters

Parameter	Description	Value
percent-threshold percent-value	Specifies a threshold over which delay information advertisement is suppressed.	The value is an integer ranging from 0 to 100, in percentage. The default value is 10.The value 0 indicates that delay information advertisement is not suppressed based on this parameter.
absolute-threshold absolute-value	Specifies an absolute value threshold over which delay information advertisement is suppressed.	The value is an integer ranging from 0 to 10000, in microseconds. The default value is 1000.The value 0 indicates that delay information advertisement is not suppressed based on this parameter.
timer time-value	Specifies a timeout period for the delay suppression timer.	The value is an integer ranging from 0 to 600, in seconds. The default value is 120. The value 0 indicates that the delay suppression timer is not started.

Parameter

Description

Value

percent-threshold percent-value

Specifies a threshold over which delay information advertisement is suppressed.

The value is an integer ranging from 0 to 100, in percentage. The default value is 10.The value 0 indicates that delay information advertisement is not suppressed based on this parameter.

absolute-threshold absolute-value

Specifies an absolute value threshold over which delay information advertisement is suppressed.

The value is an integer ranging from 0 to 10000, in microseconds. The default value is 1000.The value 0 indicates that delay information advertisement is not suppressed based on this parameter.

timer time-value

Specifies a timeout period for the delay suppression timer.

The value is an integer ranging from 0 to 600, in seconds. The default value is 120.

The value 0 indicates that the delay suppression timer is not started.

Views

OSPF view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
ospf	write

Usage Guidelines

Usage Scenario

When the delay jitter is large, routes change frequently during delay-based path computation. As a result, route information is repeatedly flooded and reported. To solve the preceding problem, run the metric-delay suppress timer command to suppress the advertisement of delay information. Suppression is performed in accordance with the following rules:

If the difference between two consecutively received delay values is within the ranges specified by percent-value and absolute-value, the system considers that no delay change occurs and will not suppress the advertisement of delay information.
The system advertises and reports a delay value only when the timeout period for the delay suppression timer specified by timer-value expires and uses the delay values reported in two consecutive periods for delay suppression calculation.

Prerequisites

The opaque capability has been enabled using the opaque-capability enable command.

Precautions

Delay information advertisement takes effect only if the metric-delay advertisement enable command is run in an IS-IS process and an interface in the IS-IS process is bound to a TWAMP Light test session.

If the delay advertisement function configured using the metric-delay advertisement enable command does not take effect, the metric-delay suppress command can be run, but the delay advertisement function does not take effect.

The value of the delay suppression timer cannot be less than the delay measurement interval.

Example

# Enable suppression of delay information advertisement for OSPF routes.

<HUAWEI> system-view
Enter system view, return user view with return command.
[~HUAWEI] ospf
[*HUAWEI-ospf-1] opaque-capability enable
[*HUAWEI-ospf-1] metric-delay suppress timer 100 percent-threshold 20 absolute-threshold 30