isis suppress-flapping peer hold-down

Function

The isis suppress-flapping peer hold-down command configures the Hold-down mode and sets duration for this mode.

The undo isis suppress-flapping peer hold-down command cancels the Hold-down mode.

By default, the Hold-down mode is disabled, and the Hold-max-cost mode is enabled.

Format

isis suppress-flapping peer hold-down interval

undo isis suppress-flapping peer hold-down [ interval ]

Parameters

Parameter	Description	Value
interval	Specifies the duration of the Hold-down mode.	The value is an integer ranging from 1 to 600, in seconds.

Views

Ethernet interface view, Ethernet sub-interface view, Eth-Trunk interface view, Eth-Trunk sub-interface view, Tunnel interface view, Loopback interface view, Dialer interface view, VLANIF interface view, Virtual-Template interface view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
isis	write

Usage Guidelines

Usage Scenario

Flapping suppression works in either Hold-down or Hold-max-cost mode.

Hold-down mode: In the case of frequent flooding and topology changes during neighbor relationship establishment, interfaces prevent neighbor relationship reestablishment during Hold-down suppression, which minimizes LSDB synchronization attempts and packet exchanges.
Hold-max-cost mode: If the traffic forwarding path changes frequently, interfaces use the maximum value (16777214 for the wide mode and 63 for the narrow mode) as the cost of the flapping link during Hold-max-cost suppression, which prevents traffic from passing through the flapping link.

Flapping suppression can also work first in Hold-down mode and then in Hold-max-cost mode.

By default, the Hold-max-cost mode takes effect. To configure the Hold-down mode and set duration for this mode, run the isis suppress-flapping peer hold-down interval command.

Prerequisites

IS-IS neighbor relationship flapping suppression must have been enabled globally before you configure the Hold-down mode and set duration for this mode. By default, the function is enabled. If it is disabled, run the undo suppress-flapping peer disable command to enable it before you configure the Hold-down mode and set duration for this mode.

Example

# Configure the Hold-down mode and set its duration to 200s on GigabitEthernet 0/0/0.

<sysname> system-view

[sysname] interface GigabitEthernet0/0/0

[sysname-GigabitEthernet0/0/0] isis suppress-flapping peer hold-down 200