Target Port: Select the preferred target port for mirroring.
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 other bandwidth intensive IP
applications 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.
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