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IGMP Snooping 321
Note that:
■ You cannot set the isolate VLAN as a multicast VLAN.
■ One user port can belong to only one multicast VLAN.
■ The port connected to a user end can only be set as a hybrid port.
■ A multicast member port must belong to the same multicast VLAN with the router
port. Or else, it cannot receive multicast packets.
■ When setting a multicast VLAN ID on the router port, you must define the port as
a trunk port or a tag-carried hybrid port, or else no multicast member port in this
multicast VLAN can receive multicast packets.
■ If a multicast member port needs to receive multicast packets forwarded by the
router port but the router port does not belong to any multicast VLAN, you should
remove the multicast member port from its multicast VLAN, or else it cannot
receive multicast packets.
Displaying and
Debugging IGMP
Snooping
Execute
display command in any view to display the running of the IGMP Snooping
configuration, and to verify the effect of the configuration. Execute
reset command
in user view to reset the IGMP Snooping statistic information. Execute
debugging
command in user view to debug IGMP Snooping configuration.
Enable multicast VLAN service-type multicast Required
Exit the VLAN view quit —
Enter the view of the Ethernet
port connected to the Layer 3
switch
interface interface-type
interface-num
—
Define the port as a trunk or
hybrid port
port link-type { trunk |
hybrid }
—
Set the VLAN IDs allowed for
the Ethernet
port hybrid vlan vlan-id-list {
tagged | untagged }
The multicast VLAN must be
included and set as tagged.
port trunk pvid vlan vlan-id
Enter the view of the Ethernet
port connected to a user
device
interface interface-type
interface-num
interface-type and
interface-num are the interface
type and interface number.
Define the port as a hybrid
port
port link-type hybrid Required
Set the VLAN IDs whose
packets are allowed to pass the
port
port hybrid vlan vlan-id-list {
tagged | untagged }
Required
The multicast VLAN must be
included and set as untagged.
Table 318 Configure multicast VLAN on Layer 2 switch (continued)
Operation Command Description
Table 319 Displaying and debugging IGMP Snooping
Operation Command
Display the information about
current IGMP Snooping
configuration
display igmp-snooping configuration
Display IGMP Snooping statistics of
received and sent messages
display igmp-snooping statistics
Display IP/MAC multicast group
information in the VLAN
display igmp-snooping group [ vlan vlanid ]
Reset the IGMP Snooping statistic
information
reset igmp-snooping statistics