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NE20E-S2 V800R010C10SPC500 Configuration Guide - IP Services 01

This is NE20E-S2 V800R010C10SPC500 Configuration Guide - IP Services
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Configuring Duplicate Address Detection

Configuring Duplicate Address Detection

Duplicate address detection is a process in which a device checks whether the address to be used for an interface has been used by another interface.

Usage Scenario

Before configuring an IPv6 unicast address for an interface, check all the interfaces on the local link and ensure that the IPv6 unicast address is unique and is not used by another interface.

Pre-configuration Tasks

Before configuring duplicate address detection, complete the following tasks:

  • Connect interfaces and configure physical parameters for the interfaces to ensure that the physical status of the interfaces is Up.

  • Configure link layer protocol parameters for the interfaces to ensure that the link layer protocol status of the interfaces is Up.

  • Configure IPv6 addresses for interfaces.

Configuration Procedures

Perform one or more of the following configurations as required.

Setting the Number of Duplicate Address Detection Attempts

A device can send NS messages to detect whether the IPv6 address to be configured has been used by another device. Therefore, the number of duplicate address detection attempts refers to the number of times NS messages are sent. Duplicate address detection is implemented using NS and NA messages. Duplicate address detection is implemented in a similar way as gratuitous ARP in IPv4.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. Run ipv6 nd dad attempts value

    The number of duplicate address detection attempts is set.

  4. Run commit

    The configuration is committed.

Setting the Duplicate Address Detection Interval

A device can send NS messages to detect whether its neighbors are reachable. Therefore, you can set the NS message transmission interval to control the neighbor reachability detection frequency. Frequent sending of NS messages can immediately determine whether neighbors are reachable. It, however, degrades the performance of the device. Therefore, it is recommended that the interval not be set too short.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. Run ipv6 nd ns retrans-timer interval

    The neighbor reachability detection interval is specified.

  4. Run commit

    The configuration is committed.

Verifying the Configuration of Duplicate Address Detection

After configuring duplicate address detection, verify the configuration.

Prerequisites

Duplicate address detection has been configured.

Procedure

  1. Run the display ipv6 interface [ interface-type interface-number | brief ] command to check duplicate address detection configurations.

Example

Run the display ipv6 interface command. The command output shows the number of duplicate address detection attempts on an interface.

<HUAWEI> display ipv6 interface gigabitethernet 0/1/0
GigabitEthernet0/1/0 current state : UP
IPv6 protocol current state : UP
link-local address is FE80::200:1FF:FE04:5D00
  Global unicast address(es):
2001::1, subnet is 2001::/64
  Joined group address(es):
    FF02::1:FF00:1
    FF02::1:FF04:5D00
    FF02::2
    FF02::1
  MTU is 1500 bytes
  ND DAD is enabled, number of DAD attempts: 2
  ND reachable time is 1200000 milliseconds
  ND retransmit interval is 1000 milliseconds
  Hosts use stateless autoconfig for addresses
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Updated: 2019-01-02

Document ID: EDOC1100055376

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