User`s guide

NetAtlas Enterprise Ethernet Switch Manager User’s Guide
Chapter 18 Multicast Configuration 154
CHAPTER 18
Multicast Configuration
This chapter shows you how to configure multicast settings and MVR (Multicast VLAN
Registration) groups. This feature is not available on all models.
18.1 Overview
Refer to Section 6.3 on page 61for more background information on IGMP and IP multicast
addresses.
18.1.1 IGMP Snooping
A switch can passively snoop on IGMP Query, Report and Leave (IGMP version 2) packets
transferred between IP multicast routers/switches and IP multicast hosts to learn the IP
multicast group membership. It checks IGMP packets passing through it, picks out the group
registration information, and configures multicasting accordingly. IGMP snooping allows the
switch to learn multicast groups without you having to manually configure them.
The switch forwards multicast traffic destined for multicast groups (that it has learned from
IGMP snooping or that you have manually configured) to ports that are members of that
group. IGMP snooping generates no additional network traffic, allowing you to significantly
reduce multicast traffic passing through your switch.
18.2 Multicast Setting
To configure multicast settings, click Configuration, Multicast Configuration. The
Multicast Setting screen displays.