Multicast; Multic A St; Multicast Overview; What You Can Do - ZyXEL Communications GS1920v2 Series User Manual

24.1 Multic a st O ve rvie w
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 Wha t Yo u C a n Do
• Use the
Multic a st Se tup
screens where you can configure IPv4 or IPv6 multicast settings.
• Use the
IPv4 Multic a st Sta tus
• Use the
IG MP Sno o ping
group multicast traffic only to ports that are members of that group.
• Use the
IPv6 Multic a st Sta tus
• Use the
ML D Sno o ping - pro xy
report group changes to a connected multicast router and forward MLD messages to other upstream
ports.
• Use the
MVR
port(s) and a source port for each multicast VLAN.
24.1.2 Wha t Yo u Ne e d to Kno w
Read on for concepts on Multicasting that can help you configure the screens in this chapter.
IP Multic a st Addre sse s
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).
Chapter 24 Multicast
screen (Section 24.2 on page
screen (Section 24.3 on page
screen (Section 24.3.1 on page
screen (Section 24.4 on page
screen (Section 24.4.1 on page
screens (Section 24.5 on page
GS1920v2 Series User's Guide
C
HA PTER
205) to display the links to the configuration
205) to view multicast group information.
206) to enable IGMP snooping to forward
211) to view multicast group information,
211) to enable the upstream port to
218) to create multicast VLANs and select the receiver
201

Multic a st

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