GS1920 Series User’s Guide
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CHAPTER 24
Multicast
24.1 Multicast Overview
This chapter shows you how to configure various multicast features.
Traditionally, IP packets are transmitted in one of either two ways - Unicast (1 sender to 1 recipient)
or Broadcast (1 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.
24.1.1 What You Can Do
•Use the Multicast Setup screen (Section 24.2 on page 188) to display the links to the
configuration screens where you can configure IPv4 or IPv6 multicast settings.
•Use the IPv4 Multicast Status screen (Section 24.3 on page 188) to view multicast group
information.
•Use the IGMP Snooping screen (Section 24.3.1 on page 189) to enable IGMP snooping to
forward group multicast traffic only to ports that are members of that group.
•Use the IPv6 Multicast Status screen (Section 24.4 on page 194) to view multicast group
information,
•Use the MLD Snooping-proxy screen (Section 24.4.1 on page 195) to enable the upstream port
to report group changes to a connected multicast router and forward MLD messages to other
upstream ports.
•Use the MVR screens (Section 24.5 on page 202) to create multicast VLANs and select the
receiver port(s) and a source port for each multicast VLAN.
24.1.2 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).
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