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Chapter 39 Multicast
XMG1915 Series User’s Guide
222
CHAPTER 39
Multicast
39.1 Multicast Overview
This chapter shows you how to configure various multicast features.
Traditionally, IP packets are transmitted in one of either two ways
– Unicast (one sender to one recipient)
or Broadcast (one sender to everybody on the network). Multicast delivers IP packets to just a group of
hosts on the network.
IGMP (Internet Group Management Protocol) is a network-layer protocol used to establish membership
in a multicast group
– it is not used to carry user data. Refer to RFC 1112, RFC 2236 and RFC 3376 for
information on IGMP versions 1, 2 and 3 respectively.
39.1.1 What You Can Do – IPv4 Multicast
• Use the IPv4 Multicast Status screen (Section 39.2 on page 223) to view IPv4 multicast group
information.
• Use the IGMP Snooping screen (Section 39.3 on page 224) to enable IGMP snooping to forward group
multicast traffic only to ports that are members of that group.
• Use the IGMP Snooping VLAN screen (Section 39.4 on page 226) to perform IGMP snooping on VLANs.
39.1.2 What You Need to Know
Read on for concepts on Multicasting that can help you configure the screens in this chapter.
IP Multicast Addresses
In IPv4, a multicast address allows a device to send packets to a specific group of hosts (multicast
group) in a different subnetwork. A multicast IP address represents a traffic receiving group, not
individual receiving devices. IP addresses in the Class D range (224.0.0.0 to 239.255.255.255) are used for
IP multicasting. Certain IP multicast numbers are reserved by IANA for special purposes (see the IANA
website for more information).
IGMP Filtering
With the IGMP filtering feature, you can control which IGMP groups a subscriber on a port can join. This
allows you to control the distribution of multicast services (such as content information distribution)
based on service plans and types of subscription.
You can set the Switch to filter the multicast group join reports on a per-port basis by configuring an
IGMP filtering profile and associating the profile to a port.
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