ospf timer hello multi-area

Function

The ospf timer hello multi-area command configures the interval at which a multi-area adjacency interface sends Hello packets.

The undo ospf timer hello multi-area command restores the default interval at which a multi-area adjacency interface sends Hello packets.

By default, a P2P multi-area adjacency interface sends Hello packets at an interval of 10s.

Format

ospf timer hello interval multi-area { area-id | area-id }

undo ospf timer hello multi-area { area-id | area-id }

Parameters

Parameter	Description	Value
interval	Specifies the interval at which the multi-area adjacency interface sends Hello packets.	The value is an integer ranging from 1 to 65535, in seconds. Setting a value that is larger than 20 for the interval is recommended. If the interval is less than 20s, adjacencies may be interrupted.
area-id	Specifies the ID of an OSPF area.	The value can be a decimal integer ranging from 0 to 4294967295 or in the format of an IP address.

Parameter

Description

Value

interval

Specifies the interval at which the multi-area adjacency interface sends Hello packets.

The value is an integer ranging from 1 to 65535, in seconds.

Setting a value that is larger than 20 for the interval is recommended. If the interval is less than 20s, adjacencies may be interrupted.

area-id

Specifies the ID of an OSPF area.

The value can be a decimal integer ranging from 0 to 4294967295 or in the format of an IP address.

Views

100GE interface view, 10GE interface view, 25GE sub-interface view, 25GE interface view, 400GE interface view, 40GE interface view, 50GE sub-interface view, 50GE interface view, Eth-Trunk interface view, FlexE interface view, GE optical interface view, GE electrical interface view, GMPLS-UNI interface view, Global VE sub-interface view, Tunnel interface view, VBDIF interface view, VE sub-interface view, VLANIF interface view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
ospf	write

Usage Guidelines

Usage Scenario

OSPF interfaces use Hello packets to establish and maintain adjacencies. A Hello packet includes information about the designated router (DR), backup designated router (BDR), timers, and known neighbors.

To set the interval at which Hello packets are sent, run the ospf timer hello multi-area command. The hello interval value will be added to Hello packets. A smaller hello interval value indicates a larger route cost and a higher speed in detecting topology changes. Ensure that parameters on the interface and those on its neighbor are the same.

Prerequisites

The ospf enable multi-area command has been run.

Precautions

The ospf timer hello multi-area command does not apply to null interfaces.

Example

# Configure the interval at which multi-area adjacency interface sends Hello packets to 20s.

<HUAWEI> system-view
[~HUAWEI] ospf 1
[*HUAWEI-ospf-1] area 0
[*HUAWEI-ospf-1-area-0.0.0.0] quit
[*HUAWEI-ospf-1] area 1
[*HUAWEI-ospf-1-area-0.0.0.1] quit
[*HUAWEI-ospf-1] quit
[*HUAWEI] interface GigabitEthernet0/1/0
[*HUAWEI-GigabitEthernet0/1/0] ospf enable 1 area 0
[*HUAWEI-GigabitEthernet0/1/0] ospf enable multi-area 1
[*HUAWEI-GigabitEthernet0/1/0] ospf timer hello 20 multi-area 1