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4.4.11 IGMP Snooping
The Internet Group Management Protocol (IGMP) is a communications protocol used to manage
the membership of Internet Protocol multicast groups. IGMP is used by IP hosts and adjacent
multicast routers to establish multicast group memberships. It can be used more efficiently when
supporting activities, such as online streaming video and gaming.
IGMP Snooping is the process of listening to IGMP traffic. IGMP snooping, as implied by the name,
is a feature that allows the switch to “listen in” on the IGMP conversation between hosts and
routers by processing the layer 3 packets that IGMP packets sent in a multicast network.
When IGMP snooping is enabled in a switch, it analyses all the IGMP packets between hosts
connected to the switch and multicast routers in the network. When a switch receives an IGMP
report for a given multicast group from a host, the switch adds the host's port number to the
multicast list for that group. When the switch hears an IGMP Leave, it removes the host's port from
the table entry.
IGMP snooping can reduce multicast traffic from streaming and make other bandwidth intensive IP
applications run more effectively. A switch using IGMP snooping will only forward multicast traffic
to the hosts in that traffic. This reduction of multicast traffic reduces the packet processing at the
switch (at the cost of needing additional memory to handle the multicast tables) and also
decreases the workload at the end hosts since their network cards (or operating system) will not
receive and filter all the multicast traffic generated in the network.
Select the folder
IGMP Snooping
from the
Switch Management
menu and then the following
screen page appears.
1. IGMP Configuration:
To enable or disable IGMP, Unregistered IPMC Flooding and set up
router ports.
2. IGMP VLANID Configuration:
To set up the ability of IGMP snooping and querying with VLAN.
3. IGMP Settings:
To set up the Query interval, response interval of IGMP snooping and enable
or disable Immediate leave.
4. IPMC Segment:
To create, edit or delete IPMC segment.
5. IPMC Profile:
To create, edit or delete IPMC profile.
6. IGMP Filtering:
To enable or disable IGMP filter and configure each port‟s IGMP filter.
Summary of Contents for FOS-3126-PLUS SERIES
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