ZyXEL Communications P-871H Series, User Manual

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P-871H Series User’s Guide
Chapter 5 Basic Setting 37
5.4 IGMP Snooping
A layer-2 device 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 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. 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.
5.5 Switch Setup Screen
Click Basic Setting and then Switch Setup in the navigation panel to display the screen as
shown. The VLAN setup screens change depending on whether you choose 802.1Q or Port
Based
in the VLAN Type field in this screen. Refer to the chapter on VLAN.