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Command Reference

CloudEngine 8800, 7800, 6800, and 5800 V200R002C50

This document describes all the configuration commands of the device, including the command function, syntax, parameters, views, default level, usage guidelines, examples, and related commands.
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ospfv3 suppress-flapping peer hold-down

ospfv3 suppress-flapping peer hold-down

Function

The ospfv3 suppress-flapping peer hold-down command configures the Hold-down mode and sets duration for this mode.

The undo ospfv3 suppress-flapping peer hold-down command cancels the Hold-down mode.

By default, the Hold-down mode is disabled.

Format

ospfv3 suppress-flapping peer hold-down interval [ instance instance-id ]

undo ospfv3 suppress-flapping peer hold-down [ interval ] [ instance instance-id ]

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.
instance instance-id Specifies the ID of the instance to which an interface belongs.

The value is an integer ranging from 0 to 255. The default value is 0.

Views

Interface view

Default Level

2: Configuration level

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 65535 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 ospfv3 suppress-flapping peer hold-down interval command.

Prerequisites

OSPFv3 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 10GE1/0/1.

<HUAWEI> system-view
[~HUAWEI] ospfv3
[*HUAWEI-ospfv3-1] router-id 10.1.1.1
[*HUAWEI-ospfv3-1] quit
[*HUAWEI] interface 10ge 1/0/1
[*HUAWEI-10GE1/0/1] undo portswitch
[*HUAWEI-10GE1/0/1] ipv6 enable
[*HUAWEI-10GE1/0/1] ospfv3 suppress-flapping peer hold-down 200

# Configure the Hold-down mode and set its duration to 200s on VLANIF100.

<HUAWEI> system-view
[~HUAWEI] ospfv3
[*HUAWEI-ospfv3-1] router-id 10.1.1.1
[*HUAWEI-ospfv3-1] quit
[*HUAWEI] interface vlanif 100
[*HUAWEI-Vlanif100] ipv6 enable
[*HUAWEI-Vlanif100] ospfv3 suppress-flapping peer hold-down 200
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Updated: 2019-03-21

Document ID: EDOC1000166501

Views: 52512

Downloads: 339

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