ONU User’s Guide
131
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H A P T E R
1 9
Multicast
19.1 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.
19.1.1 What You Can Do in the Multicast Screens
• The
Multicast Status
screen lets you view multicast group information (
• The
Multicast Setting
screen lets you configure various multicast settings, such as IGMP
snooping, host timeout, leave timeout, and so on (
• The
IGMP Snooping VLAN
screen lets you configure the ONU to automatically locate
VLANS connected to its network (
• The
IGMP Filtering Profile
screen lets you specify a range of multicast groups that
clients connected to the ONU are able to join (
).
• The
MVR
screen lets you create multicast VLANs and select the receiver port(s) and a
source port for each multicast VLAN (
• The
Group Configuration
screen lets you configure MVR IP multicast group address(es)
(
19.1.2 What You Need to Know About the Multicast Screens
The following terms and concepts may help as you read through 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 web site for more information).
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