Cisco Catalyst 4500 Series, Software Configuration Manual

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C H A P T E R
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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
29
Configuring IPv6 Multicast Listener Discovery
Snooping
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 Catalyst 4500 series switch.
This chapter includes these sections:
•
About MLD Snooping, page 29-1
•
Configuring IPv6 MLD Snooping, page 29-5
•
Displaying MLD Snooping Information, page 29-10
Note
For complete syntax and usage information for the switch commands used in this chapter, see the
Cisco IOS Command Reference Guides for the Catalyst 4500 Series Switch .
If a command is not in the Cisco Catalyst 4500 Series Switch Command Reference , you can locate it in
the Cisco IOS Master Command List, All Releases .
About 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.