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Dimension ES-4024 Ethernet Switch
Basic Setting 6-5
Note that VLAN is unidirectional; it only governs outgoing traffic.
See the VLAN chapter for information on port-based and 802.1Q tagged VLANs.
6.5 IGMP Snooping
IGMP (Internet Group Multicast 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 2236 for information IGMP version 2 and RFC 1112 for
IGMP version 1.
A layer-2 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.
Without IGMP snooping, multicast traffic is treated in the same manner as broadcast traffic, that is, it is forwarded
to all ports. With IGMP snooping, group multicast traffic is only forwarded 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.
6.6 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.
Figure 6-3 Basic Setting: Switch Setup