3Com 7757 Configuration Manual page 431

Enabling IGMP Snooping
Configuring the Version
of IGMP Snooping
Table 336 IGMP Snooping configuration tasks
Operation
Configure timers
Enable IGMP fast leave
Configure IGMP Snooping
filter
Configure to limit the number
of multicast groups on a port
Configure IGMP Snooping
querier
Configure suppression on
IGMP host report messages
Configure simulated joining
Configure multicast VLAN
You can use the command here to enable IGMP Snooping so that it can establish
and maintain MAC multicast group forwarding tables at layer 2.
Table 337 Enable IGMP Snooping
Operation
Enter system view
Enable IGMP Snooping
globally
Enter VLAN view
Enable IGMP Snooping on the
VLAN
c
CAUTION:
Although both Layer 2 and Layer 3 multicast protocols can run on the same
■
switch simultaneously, they cannot run simultaneously on a VLAN or its
corresponding VLAN interface.
Before configuring IGMP Snooping in VLAN view, you must enable IGMP
■
Snooping globally in system view. Otherwise, the IGMP Snooping feature
cannot be enabled in VLAN view.
With the development of multicast technologies, IGMPv3 has found increasingly
wide application. In IGMPv3, a host can not only join a specific multicast group but
also explicitly specify to receive or reject the information from a specific multicast
source. Working with PIM-SSM, IGMPv3 enables hosts to join specific multicast
sources and groups directly, greatly simplifying multicast routing protocols and
optimizing the network topology.
IGMP Snooping Configuration
Description Related section
Optional "Configuring Timers" on page 432
Optional "Enabling IGMP Fast Leave for a Port or
All Ports" on page 432
Optional "Configuring IGMP Snooping Filtering
ACLs" on page 433
Optional "Configuring to Limit Number of
Multicast Groups on a Port" on page 434
Optional "Configuring IGMP Snooping Querier"
on page 434
Optional "Configuring Suppression on IGMP Host
Report Messages" on page 435
Optional "Configuring IGMP Snooping Simulated
Joining" on page 436
Optional "Configuring Multicast VLAN" on page
437
Command
system-view
igmp-snooping enable
vlan vlan-id
igmp-snooping enable
431
Description
-
Required
IGMP Snooping is disabled
globally.
-
Required
By default, IGMP Snooping is
disabled on the VLAN.