IPv6 Source Specific Multicast Mapping

Source-specific multicast (SSM) SSM mapping for IPv6 supports both static and dynamic Domain Name System (DNS) mapping for MLD version 1 receivers. This feature allows deployment of IPv6 SSM with hosts that are incapable of providing MLD version 2 support in their TCP/IP host stack and their IP multicast receiving application.

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 at the end of this module.

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 Source Specific Multicast Mapping

SSM mapping for IPv6 supports both static and dynamic Domain Name System (DNS) mapping for MLD version 1 receivers. This feature allows deployment of IPv6 SSM with hosts that are incapable of providing MLD version 2 support in their TCP/IP host stack and their IP multicast receiving application.

SSM mapping allows the device to look up the source of a multicast MLD version 1 report either in the running configuration of the device or from a DNS server. The device can then initiate an (S, G) join toward the source.

How to Configure IPv6 Source Specific Multicast Mapping

Configuring IPv6 SSM

When the SSM mapping feature is enabled, DNS-based SSM mapping is automatically enabled, which means that the device will look up the source of a multicast MLD version 1 report from a DNS server.

You can configure either DNS-based or static SSM mapping, depending on your device configuration. If you choose to use static SSM mapping, you can configure multiple static SSM mappings. If multiple static SSM mappings are configured, the source addresses of all matching access lists will be used.

Before You Begin


Note

To use DNS-based SSM mapping, the device needs to find at least one correctly configured DNS server to which the device can be directly attached.

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    ipv6 mld [vrf vrf-name] ssm-map enable

    4.    no ipv6 mld [vrf vrf-name] ssm-map query dns

    5.    ipv6 mld [vrf vrf-name] ssm-map static access-list source-address

    6.    end

    7.    show ipv6 mld [vrf vrf-name] ssm-map [source-address]


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 mld [vrf vrf-name] ssm-map enable


    Example: 
    Device(config)# ipv6 mld ssm-map enable
     

    Enables the SSM mapping feature for groups in the configured SSM range.

     
    Step 4 no ipv6 mld [vrf vrf-name] ssm-map query dns


    Example: 
    Device(config)# no ipv6 mld ssm-map query dns
     

    Disables DNS-based SSM mapping.

     
    Step 5 ipv6 mld [vrf vrf-name] ssm-map static access-list source-address


    Example: 
    Device(config)# ipv6 mld ssm-map static SSM_MAP_ACL_2 2001:DB8:1::1
     

    Configures static SSM mappings.

     
    Step 6 end


    Example: 
    Device(config-if)# end
     

    Returns to privileged EXEC mode.

     
    Step 7 show ipv6 mld [vrf vrf-name] ssm-map [source-address]


    Example: 
    Device# show ipv6 mld ssm-map
     

    Displays SSM mapping information.

     

    Configuration Examples for IPv6 Source Specific Multicast Mapping

    Example: IPv6 SSM Mapping

    Device# show ipv6 mld ssm-map 2001:DB8::1

 Group address  : 2001:DB8::1
 Group mode ssm : TRUE
 Database       : STATIC
 Source list    : 2001:DB8::2
                  2001:DB8::3

Device# show ipv6 mld ssm-map 2001:DB8::2

 Group address  : 2001:DB8::2
 Group mode ssm : TRUE
 Database       : DNS
 Source list    : 2001:DB8::3
                  2001:DB8::1

    Additional References

    Related Documents

    Related Topic

    Document Title

    IPv6 addressing and connectivity

    IPv6 Configuration Guide

    Cisco IOS commands

    Cisco IOS Master Commands List, All Releases

    IP multicast commands

    Cisco IOS IP Multicast Command Reference

    IPv6 commands

    Cisco IOS IPv6 Command Reference

    Cisco IOS IPv6 features

    Cisco IOS IPv6 Feature Mapping

    Standards and RFCs

    Standard/RFC

    Title

    RFCs for IPv6

    IPv6 RFCs

    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 Source Specific Multicast Mapping

    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 Source Specific Multicast Mapping

    Feature Name

    Releases

    Feature Information

    IPv6 Source Specific Multicast Mapping

    12.2(33)SRA

    12.2(18)SXE

    12.4(2)T

    Cisco IOS XE Release 2.1

    15.0(1)S

    This feature allows deployment of IPv6 SSM with hosts that are incapable of providing MLD version 2 support in their TCP/IP host stack and their IP multicast receiving application.

    The following commands were introduced or modified: ipv6 mld ssm-map enable, ipv6 mld ssm-map query dns, ipv6 mld ssm-map static, show ipv6 mld ssm-map.