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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 timer hello

ospfv3 timer hello

Function

The ospfv3 timer hello command specifies the interval for sending Hello packets on the interface instance.

The undo ospfv3 timer hello command restores the default interval.

By default, for the interface of the P2P and broadcast type, the interval for sending Hello packets is 10 seconds. For the interface of the P2MP and NBMA type, the interval for sending Hello packets is 30 seconds.

Format

ospfv3 timer hello interval [ conservative ] [ instance instance-id ]

undo ospfv3 timer hello [ interval [ conservative ] ] [ instance instance-id ]

Parameters

Parameter Description Value
interval Indicates the interval for an interface to send the Hello packets. The value is an integer ranging from 1 to 65535, in seconds.
conservative Indicates the conservative mode of the dead timer. If the conservative mode is configured, the value configured for the dead timer using the ospfv3 timer dead command takes effect even when the value is less than 10s. -
instance instance-id Specifies the interface instance ID. 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

Hello packets are periodically exchanged by OSPFv3 interfaces to establish and maintain neighbor relationships. A Hello packet contains information about timers, DRs, BDRs, and known neighbors.

The smaller the interval value, the faster a network topology change can be detected, and the larger the route cost. Ensure that the parameters of this interface and the adjacent routers are consistent.

To speed up OSPFv3 convergence in the case of a link failure, Configuring BFD for OSPFv3 is recommended. If the remote end does not support BFD for OSPFv3 or you do not want to configure BFD for OSPFv3, specify conservative when you run the ospfv3 timer hello command. If the conservative mode is configured, the value configured for the dead timer using the ospfv3 timer dead command takes effect even when the value is less than 10s; if the value configured for the dead timer is greater than 10s, services may be affected.

Prerequisites

Before running this command on an interface, run the ospfv3 area command on the interface to enable OSPFv3.

Precautions

The command cannot be run on a null interface.

If the configured interval (X) at which Hello packets are sent is less than 10s, the valid interval (Y) is calculated using the formula: Y = X/2 + X mod 2, in which mod indicates a modulo operation. The valid interval prevents neighbor flapping and improves network reliability.

If hello interval is set but a dead interval is not set using the ospfv3 timer dead command, the dead interval of an OSPFv3 neighbor is four times the value of hello interval. If the dead interval of an OSPFv3 neighbor is shorter than 10s, the session may be closed. Therefore, if hello interval is shorter than or equal to 2s, the actual dead interval of an OSPFv3 neighbor is not shorter than 10s. If conservative is specified, the dead interval of an OSPFv3 neighbor is still four times the value of hello interval in this case.

Example

# Set the interval for sending Hello packets on VLANIF10 to 20 seconds.

<HUAWEI> system-view
[~HUAWEI] ospfv3
[*HUAWEI-ospfv3-1] router-id 10.1.1.1
[*HUAWEI-ospfv3-1] quit
[*HUAWEI] interface vlanif 10
[*HUAWEI-Vlanif10] ipv6 enable
[*HUAWEI-Vlanif10] ospfv3 1 area 1
[*HUAWEI-Vlanif10] ospfv3 timer hello 20

# Set the interval for sending Hello packets on 10GE1/0/1 to 20 seconds.

<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 1 area 1
[*HUAWEI-10GE1/0/1] ospfv3 timer hello 20
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Updated: 2019-03-21

Document ID: EDOC1000166501

Views: 51107

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