Igmp; Figure 81 Advanced: Igmp; Table 61 Advanced: Igmp - ZyXEL Communications ZyXEL Prestige 794M User Manual

Prestige 794M User's Guide

12.3 IGMP

A Prestige 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
Prestige to learn multicast groups without you having to manually configure them.
The Prestige can also forward 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. The Prestige discards multicast traffic destined for multicast groups that it does
not know. IGMP snooping generates no additional network traffic, allowing you to
significantly reduce multicast traffic passing through your Prestige.
Click Configuration, Advanced and IGMP to display the screen as shown.

Figure 81 Advanced: IGMP

The following table describes the labels in this screen.

Table 61 Advanced: IGMP

LABEL
IGMP Forwarding
IGMP Snooping
Apply
115
DESCRIPTION
Activate this feature to set the Prestige to forward IGMP packets.
Activate this feature to set the Prestige to learn multicast group memberships.
Click Apply to save the changes.
Chapter 12 Device Management