hello-option override-interval (IPv4)

Function

The hello-option override-interval command sets the interval for overriding the prune action in a Hello message.

The undo hello-option override-interval command restores the default interval.

By default, the interval for overriding the prune action in a Hello message is 2500 ms.

Format

hello-option override-interval interval

undo hello-option override-interval

Parameters

Parameter	Description	Value
interval	Specifies set the interval for overriding the prune action in a Hello message.	The value ranges from 1 to 65535, in milliseconds.

Parameter

Description

Value

interval

Specifies set the interval for overriding the prune action in a Hello message.

The value ranges from 1 to 65535, in milliseconds.

Views

VPN instance PIM view, PIM view of a public network instance

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
pim	write

Usage Guidelines

Usage Scenario

Hello messages sent by Routers carry lan-delay and override-interval. override-interval refers to the period during which a downstream Router overrides the prune action. When the values of override-interval on all Routers on the same link are different, the maximum value of these values is used.

If a Router receives a Prune message from the upstream interface, it indicates that other downstream Routers still exist in the LAN. If the Router still needs to receive multicast data, it must send a Join message to the upstream interface in the override-interval period.

The value of PPT is obtained by the value of lan-delay plus the value of override-interval. When receiving a Prune message from a downstream interface, the Router does not perform the prune action until the PPT times out. If the Router receives a Join message from the downstream interface in PPT, the interface cancels the Prune action.

Prerequisites

The multicast routing-enable command is run in the public network instance view or VPN instance view.

Configuration Impact

If the hello-option override-interval command is run more than once, the latest configuration overrides the previous one.

Example

# In the public network instance, set the interval for overriding the prune action in a Hello message to 2000 ms.

<HUAWEI> system-view
[~HUAWEI] multicast routing-enable
[*HUAWEI] pim
[*HUAWEI-pim] hello-option override-interval 2000