Understanding Mld Snooping - Cisco 3032 Software Configuration Manual

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Configuring IPv6 MLD Snooping

You can use Multicast Listener Discovery (MLD) snooping to enable efficient distribution of IP

Version 6 (IPv6) multicast data to clients and routers in a switched network on the switch. Unless

otherwise noted, the term switch refers to a standalone switch and to a switch stack.

To use IPv6, you must configure the dual IPv4 and IPv6 Switch Database Management (SDM) template

on the switch. You select the template by entering the sdm prefer dual-ipv4-and-ipv6 {default |

routing | vlan} global configuration command.

For related information, see these chapters:

For complete syntax and usage information for the commands used in this chapter, see the command

reference for this release or the Cisco IOS documentation referenced in the procedures.

This chapter includes these sections:

Understanding MLD Snooping

In IP Version 4 (IPv4), Layer 2 switches can use Internet Group Management Protocol (IGMP) snooping

to limit the flooding of multicast traffic by dynamically configuring Layer 2 interfaces so that multicast

traffic is forwarded to only those interfaces associated with IP multicast devices. In IPv6, MLD snooping

performs a similar function. With MLD snooping, IPv6 multicast data is selectively forwarded to a list

of ports that want to receive the data, instead of being flooded to all ports in a VLAN. This list is

constructed by snooping IPv6 multicast control packets.

MLD is a protocol used by IPv6 multicast routers to discover the presence of multicast listeners (nodes

wishing to receive IPv6 multicast packets) on the links that are directly attached to the routers and to

discover which multicast packets are of interest to neighboring nodes. MLD is derived from IGMP;

MLD Version 1 (MLDv1) is equivalent to IGMPv2, and MLD Version 2 (MLDv2) is equivalent to

For more information about SDM templates, see

For information about IPv6 on the switch, see

"Understanding MLD Snooping" section on page 25-1

"Configuring IPv6 MLD Snooping" section on page 25-5

"Displaying MLD Snooping Information" section on page 25-11

Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide

C H A P T E R

Chapter 8, "Configuring SDM Templates."

Chapter 39, "Configuring IPv6 Unicast Routing."

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