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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-max-cost disable

ospfv3 suppress-flapping peer hold-max-cost disable

Function

The ospfv3 suppress-flapping peer hold-max-cost disable command disables the Hold-max-cost mode.

The undo ospfv3 suppress-flapping peer hold-max-cost disable command enables the Hold-max-cost mode.

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

Format

ospfv3 suppress-flapping peer hold-max-cost disable [ instance instance-id ]

undo ospfv3 suppress-flapping peer hold-max-cost disable [ instance instance-id ]

Parameters

Parameter Description Value
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.

NOTE:
The Hold-max-cost mode can prevent a device from being isolated from the network. If a device on a key path is isolated from the network due to OSPFv3 neighbor relationship flapping, the network is separated into two isolated parts. To prevent this problem, use the Hold-max-cost mode on the key path.

Prerequisites

OSPFv3 neighbor relationship flapping suppression must have been enabled globally before you configure duration for the Hold-max-cost 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 duration for the Hold-max-cost mode.

Precautions

The Hold-max-cost mode takes effect only unidirectionally. If a remote device does not support OSPFv3 neighbor relationship flapping suppression, bidirectional traffic between the local and remote devices may travel along different paths.

Example

# Disable the Hold-max-cost mode 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-max-cost disable

# Disable the Hold-max-cost mode 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-max-cost disable
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Updated: 2019-03-21

Document ID: EDOC1000166501

Views: 42738

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