IPv6 First-Hop Security Configuration Guide, Cisco IOS XE Release 3S
IPv6 Neighbor Discovery Multicast Suppress
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IPv6 Neighbor Discovery Multicast Suppress

IPv6 Neighbor Discovery Multicast Suppress

Some deployment environments, such as large wireless networks, have scarce bandwidth and rely on proxy features to reduce the amount of control traffic exchanged between nodes on the link. IPv6 Neighbor Discovery (ND) Multicast Suppress is one of the proxy features used in such situations. The IPv6 ND Multicast Suppress feature is an IPv6 snooping feature that runs on a switch or a wireless controller and is used to reduce the amount of control traffic necessary for proper link operations.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

Restrictions for IPv6 Neighbor Discovery Multicast Suppress

  • The IPv6 ND Multicast Suppress feature is not supported on Etherchannel ports.

Information About IPv6 Neighbor Discovery Multicast Suppress

IPv6 DAD Proxy

The IPv6 Duplicate Address Detection (DAD) Proxy feature provides host-to-host connectivity in LANs where direct communication between hosts is not possible. This process raises an issue with IPv6 DAD, especially with link-local addresses, which are auto-assigned by hosts using the IPv6 stateless address autoconfiguration ND protocol.

When a host needs to verify that its address is unique, it enables the DAD procedure. However, when the two hosts cannot communicate with each other, this procedure cannot detect a duplicate address. If the DAD procedure cannot run, there is the slight possibility that two hosts will assign the same link-local address, which will cause both hosts to fail when they try to reach the DHCPv6 server. The IPv6 DAD Proxy feature responds on behalf of the address’s owner when an address is already in use.

The following figure provides an overview of the IPv6 DAD Proxy feature:

Figure 1. IPv6 DAD Proxy

How to Configure IPv6 Neighbor Discovery Multicast Suppress

Configuring IPv6 DAD Proxy on an Interface

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    interface type number

    4.    ipv6 nd dad-proxy

    5.    exit


DETAILED STEPS
      Command or Action Purpose
    Step 1 enable


    Example:
    Device> enable 
     

    Enables privileged EXEC mode.

    • Enter your password if prompted.
     
    Step 2 configure terminal


    Example:
    Device# configure terminal 
     

    Enters global configuration mode.

     
    Step 3 interface type number


    Example:
    Device(config)# interface GigabitEthernet 0/0/1
     

    Specifies an interface type and number, and enters interface configuration mode.

     
    Step 4 ipv6 nd dad-proxy


    Example:
    Device(config-if)# ipv6 nd dad-proxy
     

    Enables the IPv6 ND DAD Proxy feature on the interface.

     
    Step 5 exit


    Example:
    Device(config-if)# exit
     

    Exits interface configuration mode.

     

    Configuration Examples for IPv6 Neighbor Discovery Multicast Suppress

    Example: Configuring IPv6 Neighbor Discovery DAD Proxy on an Interface

    Device(config)# interface Ethernet 0/0
    Device(config-if)# ipv6 nd dad-proxy
          

    Additional References for IPv6 Neighbor Discovery Multicast Suppress

    Related Documents

    Related Topic

    Document Title

    IPv6 addressing and connectivity

    IPv6 Configuration Guide

    Cisco IOS commands

    Cisco IOS Master Commands List, All Releases

    IPv6 commands

    Cisco IOS IPv6 Command Reference

    Cisco IOS IPv6 features

    Cisco IOS IPv6 Feature Mapping

    MIBs

    MIB

    MIBs Link

    To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

    http:/​/​www.cisco.com/​go/​mibs

    Technical Assistance

    Description

    Link

    The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

    http:/​/​www.cisco.com/​cisco/​web/​support/​index.html

    Feature Information for IPv6 Neighbor Discovery Multicast Suppress

    The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

    Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

    Table 1 Feature Information for IPv6 Neighbor Discovery Multicast Suppress

    Feature Name

    Releases

    Feature Information

    IPv6 Neighbor Discovery Multicast Suppress

    15.1(2)SG

    Cisco IOS XE Release 3.8S

    Cisco IOS XE Release 3SE

    Cisco IOS XE Release 3.9S

    The IPv6 ND Multicast Suppress feature is an IPv6 snooping feature that runs on a switch or a wireless controller and is used to reduce the amount of control traffic necessary for proper link operations.

    The following commands were introduced or modified: ipv6 nd dad-proxy, ipv6 nd suppress attach-policy, ipv6 nd suppress policy, mode dad-proxy, mode md-proxy.