Igmp Snooping - Tripp Lite NGI-M08POE8-L2 Owner's Manual

6.2 IGMP Snooping

6.2.1 IGMP Snooping
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 report suppression:
This feature enables the Layer 2 device to forward only the first IGMP report for a multicast
group to its directly connected Layer 3 device. Other reports for the same group in the same
query interval are discarded. Use this feature to reduce multicast traffic.
Configurations:
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.
The default port Immediate Leave state is disabled for all ports.
The default port Querier Mode state is auto for all ports.
The IGMP snooping Report Suppression is disabled.
Notices There are a global state and per VLAN states. When the global state is disabled, the
77