pim hello-option lan-delay

Function

The pim hello-option lan-delay command sets the delay in transmitting Prune messages on a shared network segment.

The undo pim hello-option lan-delay command restores the default setting.

By default, a PIM interface delays sending Prune messages on the shared network segment for 500 milliseconds.

Format

pim hello-option lan-delay interval

undo pim hello-option lan-delay

Parameters

Parameter	Description	Value
lan-delay interval	Specifies the delay in sending Prune messages on the shared network segment.	The value is an integer that ranges from 1 to 32767, in milliseconds.

Parameter

Description

Value

lan-delay interval

Specifies the delay in sending Prune messages on the shared network segment.

The value is an integer that ranges from 1 to 32767, in milliseconds.

Views

100ge sub-interface view, 100GE interface view, 10GE sub-interface view, 10GE interface view, 200GE sub-interface view, 25GE sub-interface view, 25GE interface view, 400GE sub-interface view, 400GE interface view, 40GE sub-interface view, 40GE interface view, 50GE sub-interface view, 50GE interface view, Eth-Trunk sub-interface view, Eth-Trunk interface view, FlexE interface view, GE optical interface view, GE sub-interface view, GE interface view, GE electrical interface view, Global VE sub-interface view, Loopback interface view, PW-VE sub-interface view, Tunnel interface view, VBDIF interface view, VE sub-interface view, VLANIF interface view, Virtual template view

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. lan-delay indicates the delay in transmitting messages in the LAN. When the values of lan-delay 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.

When receiving a Prune message from a downstream interface, the Router does not perform the prune action immediately until the Prune-Pending Timer (PPT) times out. The PPT equals the value of the lan-delay plus the override-interval. If the Router receives a Join message from the downstream interface in PPT, the Router 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 pim hello-option lan-delay command is run more than once, the latest configuration overrides the previous one.

Example

# Set GE 0/1/0 to delay sending Prune messages on the shared network segment for 200 milliseconds.

<HUAWEI> system-view
[~HUAWEI] multicast routing-enable
[*HUAWEI] interface GigabitEthernet 0/1/0
[*HUAWEI-GigabitEthernet0/1/0] undo portswitch
[*HUAWEI-GigabitEthernet0/1/0] pim hello-option lan-delay 200