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.

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 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

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 https://cfnng.cisco.com/. An account on Cisco.com is not required.