Igmp Snooping - ZyXEL Communications GS-4012F/4024 User Manual

IGMP
IGMP (Internet Group Multicast Protocol) is a session-layer protocol used to establish
membership in a multicast group - it is not used to carry user data.

IGMP Snooping

The switch supports IGMP snooping enabling group multicast traffic to be only forwarded to
ports that are members of that group; thus allowing you to significantly reduce multicast
traffic passing through your switch.
IP Multicast
With IP multicast, the switch delivers IP packets to a group of hosts on the network - not
everybody. In addition, the switch can send packets to Ethernet devices that are not VLAN-
aware by untagging (removing the VLAN tags) IP multicast packets.
Multicast VLAN Registration (MVR)
Multicast VLAN Registration (MVR) is designed for applications (such as Media-on-Demand
(MoD)) using multicast traffic across a network. MVR allows one single multicast VLAN to
be shared among different subscriber VLANs on the network.
This improves bandwidth utilization by reducing multicast traffic in the subscriber VLANs
and simplifies multicast group management.
RIP
RIP (Routing Information Protocol allows a routing device to exchange routing information
with other routers.
OSPF
OSPF (Open Shortest Path First) is a link-state protocol designed to distribute routing
information within an autonomous system (AS). An autonomous system is a collection of
networks using a common routing protocol to exchange routing information. OSPF is best
suited for large networks.
DVMRP
DVMRP (Distance Vector Multicast Routing Protocol) is a protocol used for routing multicast
data within an autonomous system (AS). DVMRP provides multicast forwarding capability to
a layer 3 switch that runs both the IPv4 protocol (with IP Multicast support) and the IGMP
protocol.
Chapter 1 Getting to Know Your Switch
GS-4012F/4024 User's Guide
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