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OmniSwitch 6800/6850/9000 Network Configuration Guide June 2006 page 28-1

28 Configuring IP Multicast

Switching

IP Multicast Switching is a one-to-many communication technique employed by emerging applications,

such as video distribution, news feeds, conferencing, netcasting, and resource discovery (OSPF, RIP2, and

BOOTP). Unlike unicast, which sends one packet per destination, multicast sends one packet to all devices

in any subnetwork that has at least one device requesting the multicast traffic. Multicast switching also

requires much less bandwidth than unicast techniques and broadcast techniques, since the source hosts

only send one data stream to the ports on which destination hosts that request it are attached.

Destination hosts signal their intent to receive a specific IP multicast stream by sending a request to do so

to a nearby switch by using Internet Group Management Protocol (IGMP). This is referred to as IGMP

Snooping. Destination hosts signal their intent to receive a specific IPv6 multicast stream by sending a

request to do so to a nearby switch by using Multicast listener discovery protocol (MLD). This is referred

to as MLD Snooping. The switch then learns on which ports multicast group subscribers are attached and

can intelligently deliver traffic only to the respective ports. Alcatel’s implementation of IGMP snooping is

called IP Multicast Switching (IPMS) and MLD snooping is called IP Multicast Switching version 6

(IPMSv6). IPMS/IPMSv6 allows switches to efficiently deliver multicast traffic in hardware at wire speed.

Note. IPMSv6 is only supported on the OmniSwitch 6850 and OmniSwitch 9000 switches for this release.

In This Chapter

This chapter describes the basic components of IPMS and how to configure them through the Command

Line Interface (CLI). CLI commands are used in the configuration examples; for more details about the

syntax of commands, see the OmniSwitch CLI Reference Guide.

Configuration procedures described in this chapter include:

• Enabling and disabling IP Multicast Switching and Routing on page 28-8.

• Configuring and removing an IGMP static neighbor on page 28-9.

• Configuring and removing an IGMP static querier on page 28-10.

• Configuring and removing an IGMP static group on page 28-11.

• Modifying IPMS parameters beginning on page 28-12.

• Enabling and disabling IPv6 Multicast Switching and Routing on page 28-21.

• Configuring and removing an MLD static neighbor on page 28-22.

• Configuring and removing an MLD static querier on page 28-23.

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