ipv6 nd ns retrans-timer

Function

The ipv6 nd ns retrans-timer command sets the interval for sending NS messages.

The undo ipv6 nd ns retrans-timer command restores the default setting.

By default, the interval for sending NS messages is 1000 milliseconds.

Format

ipv6 nd ns retrans-timer interval

undo ipv6 nd ns retrans-timer

Parameters

Parameter	Description	Value
interval	Specifies the interval for sending NS messages.	The value is an integer ranging from 1000 to 4294967295, in milliseconds.

Parameter

Description

Value

interval

Specifies the interval for sending NS messages.

The value is an integer ranging from 1000 to 4294967295, 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, PW-VE sub-interface view, PW-VE interface view, VBDIF interface view, VE sub-interface view, VLANIF interface view, Management interface view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
nd	write

Usage Guidelines

Usage Scenario

The interval for sending NS messages provides the following functions:

Controlling the interval for a local Router to probe the reachability of neighbors
Controlling the interval for a local Router to perform DAD
Being a parameter field in an RA message to notify the hosts of the interval for sending NS messages

Prerequisites

Before running the ipv6 nd ns retrans-timer command to set the interval for sending NS messages, you need to run the ipv6 enable command in the interface view to enable the IPv6 function on the interface.

Configuration Impact

Frequently sending NS messages results in the high CPU usage, which affects the system performance. Therefore, you are recommended to set the interval for sending NS messages to a longer value. The default interval, 1000 milliseconds, is recommended.

The ipv6 nd ns retrans-timer command is circular in nature. That is, if the intervals set two times are different, the latest setting takes effect.

Precautions

Commonly, the interval for sending NS message is the same as that for sending RA messages. In the following cases, however, the interval for sending NS messages is of the default value 1000 milliseconds whereas the interval for sending NA messages is 0 milliseconds.

The interval for sending NS messages is not set, that is, the default value is used.
The undo ipv6 nd ns retrans-timer command is run to restore the default setting.
After a host receives an RA message with the interval for sending NA messages being 0 milliseconds from a Router, it uses the default interval, 1000 milliseconds for sending NS messages, consistent with that on the Router.

Example

# Set the interval for sending NS messages to 10000 milliseconds on GE 0/1/1.

<HUAWEI> system-view
[~HUAWEI] interface GigabitEthernet 0/1/1
[~HUAWEI-GigabitEthernet0/1/1] ipv6 enable
[*HUAWEI-GigabitEthernet0/1/1] ipv6 nd ns retrans-timer 10000