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DWS-1008 User’s Manual
D-Link Systems, Inc.
Configuring and Managing IGMP Snooping
Configuring and Managing
IGMP Snooping
Internet Group Management Protocol (IGMP) snooping controls multicast traffic on a
DWS-1008 switch by forwarding packets for a multicast group only on the ports that are
connected to members of the group. A multicast group is a set of IP hosts that receive traffic
addressed to a specific Class D IP address, the group address.
The switch listens for multicast packets and maintains a table of multicast groups, as well as
their sources and receivers, based on the traffic. IGMP snooping is enabled by default.
You can configure IGMP snooping parameters and enable or disable the feature on an
individual VLAN basis. The current software version supports IGMP versions 1 and 2.
Disabling or Reenabling IGMP Snooping
IGMP snooping is enabled by default. To disable or reenable the feature, use the following
command:
set igmp
{
enable
|
disable
} [
vlan
vlan-id
]
If you do not specify a VLAN ID, the change is applied to all VLANs on the switch.
Disabling or Reenabling Proxy Reporting
Proxy reporting reduces multicast overhead by sending only one report for each active
group to the multicast routers, instead of sending a separate report from each multicast
receiver. For example, if the switch receives reports from three receivers for multicast group
237.255.255.255, the switch sends only one report for the group to the routers. One report
is sufficient to cause the routers to continue sending data for the group. Proxy reporting is
enabled by default.
To disable or reenable proxy reporting, use the following command:
set igmp proxy-report
{
enable
|
disable
} [
vlan
vlan-id
]
Enabling the Pseudo-Querier
The IGMP pseudo-querier enables IGMP snooping to operate in a VLAN that does not have
a multicast router to send IGMP general queries to clients.
Summary of Contents for DWS-1008
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