Igmp Snooping - Tripp Lite NGI-S04C2 Owner's Manual

4.4.2.

IGMP Snooping

Introduction
The IGMP snooping is for multicast traffic. The Switch can passively snoop on IGMP
packets transferred between IP multicast routers/switches and IP multicast hosts to learn
the IP multicast group membership. It checks IGMP packets passing through it, picks out
the group registration information, and configures multicasting accordingly. IGMP
snooping allows the Switch to learn multicast groups without you having to manually
configure them.
The Switch can passively snoop on IGMP packets transferred between IP multicast
routers/switches and IP multicast hosts to learn the IP multicast group membership. It
checks IGMP packets passing through it, picks out the group registration information,
and configures multicasting accordingly. IGMP snooping allows the Switch to learn
multicast groups without you having to manually configure them.
The Switch forwards multicast traffic destined for multicast groups (that it has learned
from IGMP snooping or that you have manually configured) to ports that are members of
that group. IGMP snooping generates no additional network traffic, allowing you to
significantly reduce multicast traffic passing through your Switch.
The Switch can perform IGMP snooping on up to 4094 VLANs. You can configure the
Switch to automatically learn multicast group membership of any VLANs. The Switch
then performs IGMP snooping on the first VLANs that send IGMP packets. Alternatively,
you can specify the VLANs that IGMP snooping should be performed on. This is referred
to as fixed mode. In fixed mode the Switch does not learn multicast group membership of
any VLANs other than those explicitly added as an IGMP snooping VLAN.
IGMP Snooping VLAN State
Users can enable/disable the IGMP Snooping on the Switch. Users also can
enable/disable the IGMP Snooping on a specific VLAN. If the IGMP Snooping on the
Switch is disabled, the IGMP Snooping is disabled on all VLANs even some of the
VLAN IGMP Snooping are enabled.
Default Settings
If received packets are not received after 400 seconds, all multicast entries will be
deleted.
The default global IGMP snooping state is disabled.
The default VLAN IGMP snooping state is disabled for all VLANs.
The unknown multicast packets will be dropped.
Notices: There are a global state and per VLAN states. When the global state is disabled,
the IGMP snooping on the Switch is disabled even per VLAN states are enabled. When
the global state is enabled, user must enable per VLAN states to enable the IGMP
Snooping on the specific VLAN.
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