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

IPv6 Neighbor Discovery (ND) Multicast Suppress suppresses the ND multicast Neighbor Solicit (NS) messages, by either dropping it (and responding to solicitations on behalf of the targets) or converting it into unicast traffic. The conversion of multicast traffic into unicast traffic is performed by replacing a Layer-2 Multicast Destination MAC with a Layer- 2 Unicast Destination MAC. This requires the knowledge of addresses on the link and their binding to the Layer-2. The multicast messages suppressed are Neighbor Solicitation (NS) messages.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and 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.

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.

Information About IPv6 Neighbor Discovery Multicast Suppress

Overview of IPv6 Neighbor Discovery Multicast Suppress

The IPv6 Neighbor Discovery (ND) multicast suppress feature stops the ND multicast Neighbor Solicit (NS) messages by dropping them (and responding to solicitations on behalf of the targets) or by converting them into unicast traffic. This feature reduces the amount of control traffic necessary for proper link operations.

When an address is inserted into the binding table, an address resolution request sent to a multicast address is intercepted, and the device either responds on behalf of the address owner or converts the request into a unicast message and forwards it to its destination.

The following figure provides an overview of this feature:



How to Configure IPv6 Neighbor Discovery Multicast Suppress

Configuring IPv6 Neighbor Discovery Multicast Suppress on an Interface

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    ipv6 nd suppress policy policy-name

    4.    [no] mode mc-proxy

    5.    [no] mode full-proxy

    6.    end


DETAILED STEPS
     Command or ActionPurpose
    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 ipv6 nd suppress policy policy-name


    Example:
    Device (config)# ipv6 nd suppress policy policy1
    Device (config-nd-suppress)# 
     

    Specifies a name for the Neighbor Discovery (ND) suppress policy to be configured.

     
    Step 4[no] mode mc-proxy


    Example:
    Device (config-nd-suppress)# mode mc-proxy
     

    Specifies if the ND suppress must proxy all multicast Neighbor Solicitation (NS) messages.

     
    Step 5[no] mode full-proxy


    Example:
    Device (config-nd-suppress)# mode full-proxy
     

    Specifies if the ND suppress must proxy both unicast and multicast NS messages.

     
    Step 6end


    Example:
    Device (config-nd-suppress)# end
     

    Exits the ND suppress mode and returns to privileged EXEC mode.

     

    Configuration Examples for IPv6 Neighbor Discovery Multicast Suppress

    Example: Configuring IPv6 Neighbor Discovery Suppress on an Interface

    Device> enable
    Device(config)# interface Ethernet 0/0
    Device(config-if)# ipv6 nd suppress attach-policy policy1
          

    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 with DAD Proxy

    Cisco IOS XE Release 3.8S

    Cisco IOS XE Release 3SE

    Cisco IOS XE Release 3.9S

    IPv6 Duplicate Address Detection (DAD) Proxy feature responds to the DAD queries on behalf of a node that owns the queried address. It is useful in environments where nodes cannot communicate directly on the link.

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