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Multicast advanced configuration
IGMP snooping configuration
A host uses IGMP to inform a router when it joins or leaves an Internet Multicast group. IGMP
snooping allows the switch to "listen in" on the IGMP conversation between hosts and routers by
processing the layer 3 IGMP packets sent in a multicast network.
When IGMP snooping is enabled on the BSG, it analyses all the IGMP packets between hosts
connected to the BSG and multicast routers in the network. When the BSG hears an IGMP report
from a host for a given multicast group, it adds the host's port number to the multicast list for that
group. When an IGMP leave is received from a host, the BSG removes the host's port from the
table entry.
Prerequisites to IGMP snooping advanced configuration
•
You must disable Dynamic Multicast Learning before you can enable IGMP Snooping (see
VLAN basic settings configuration parameters (page
IGMP snooping configuration navigation
•
IGMP snooping basic settings configuration parameters (page 154)
•
IGMP snooping timer configuration parameters (page 155)
•
IGMP snooping interface configuration parameters (page 156)
•
IGMP snooping VLAN router ports mapping information (page 157)
•
IGMP snooping multicast forwarding group information (page 158)
IGMP snooping basic settings configuration parameters
The following section describes the parameters for configuration of the IGMP snooping basic
settings located at Configuration,
NN47928-500
NN47928-500
Multicast, IGMP Snooping, Basic Settings tab
111)).
.
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