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Chapter 4
Web Configuration & Operation
Groups:
Group ID
Port Members:
Ports that belong to this group.
4.10.4 MVR SFM Information
VLAN ID:
VLAN ID of the group.
Group:
The group address.
Port:
Switch port number.
Mode:
Indicate the filtering mode maintained per (VLAN ID, port number, Group Address) basis. It can be either Include
or Exclude.
Source Address:
The source IP Address. Currently, the system limits the total number of source IP addresses for filtering
to be 128. When there is no source filtering address, "None" is shown in the Source Address field.
Type:
Indicate the Type. It can be either Allow or Deny.
Hardware Filter/Switch:
Indicate whether data plane destined to the specific group address from the source IPv4/IPv6
address could be handled by chip or not.
4.11 IPMC
The “IPMC” menu includes IGMP Snooping and MLD Snooping sub menu. Select the appropriate menu to set up detailed
configurations.
4.11.1 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.
Summary of Contents for GSW-3208M2
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