ipv6 nd nud attempts

Function

The ipv6 nd nud attempts command sets the number of probe retransmissions for ND entries in the PROBE state.

The undo ipv6 nd nud attempts command restores the default configuration.

By default, the number of probe retransmissions for ND entries in the PROBE state is 3.

Format

ipv6 nd nud attempts attempts

undo ipv6 nd nud attempts

undo ipv6 nd nud attempts attempts

Parameters

Parameter	Description	Value
attempts	Specifies the number of probe retransmissions for ND entries in the PROBE state.	The value is an integer ranging from 1 to 10.

Parameter

Description

Value

attempts

Specifies the number of probe retransmissions for ND entries in the PROBE state.

The value is an integer ranging from 1 to 10.

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

If an ND entry is in the PROBE state, the neighbor is no longer known to be reachable. The device sends unicast NS messages to detect the validity of the ND entry. If a response is received from the neighbor, the ND entry enters the REACH state, indicating that the neighbor is known to have been reachable. If no response is received from the neighbor, the ND entry is deleted.

You are advised to run the ipv6 nd nud attempts command to set the number of probe retransmissions for ND entries in the PROBE state to a larger value in the following situations:

The link reliability on the network is poor, and packet loss may occur during packet transmission.
The peer device is busy processing services and cannot process NS messages in time.
This prevents ND entries from being mistakenly deleted, hence negatively affecting packet forwarding efficiency if no response is received from the neighbor within the specified period (calculated as Default number of probe retransmissions x Default interval of probe retransmissions).

Prerequisites

IPv6 has been enabled using the ipv6 enable command.

Example

# Set the number of probe retransmissions for ND entries in the PROBE state on GE 0/1/1 to 5.

<HUAWEI> system-view
[~HUAWEI] interface GigabitEthernet 0/1/1
[~HUAWEI-GigabitEthernet0/1/1] ipv6 enable
[*HUAWEI-GigabitEthernet0/1/1] ipv6 nd nud attempts 5