Displaying And Maintaining Multicast Vlan; Multicast Vlan Configuration Example - 3Com Switch 4800G 24-Port Configuration Manual

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HAPTER ULTICAST
Displaying and
Maintaining Multicast
VLAN
Multicast VLAN
Configuration
Example
VLAN C
ONFIGURATION
To do...
Configure a specific VLAN as
a multicast VLAN
Configure sub-VLANs for a
specific multicast VLAN
n
The VLAN to be configured as the multicast VLAN and the VLANs to be
■
configured as sub-VLANs of the multicast VLAN must exist.
The number of sub-VLANs of the multicast VLAN must not exceed the
■
system-defined limit (an Switch 4800G supports a maximum of one multicast
VLAN and 127 sub-VLANs).
c
CAUTION:
You cannot configure any multicast VLAN or a sub-VLAN of a multicast VLAN
■
on a device with IP multicast routing or routing enabled.
After a VLAN is configured into a multicast VLAN, IGMP Snooping must be
■
enabled in the VLAN before the multicast VLAN feature can be implemented,
while it is not necessary to enable IGMP Snooping in the sub-VLANs of the
multicast VLAN.
To do...
Display information about a
multicast VLAN and its
sub-VLANs
Network requirements
Router A connects to a multicast source through GigabitEthernet 1/0/2 and to
■
Switch A, through GigabitEthernet 1/0/1.
IGMP is required on Router A, and IGMP Snooping is required on Switch A.
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Router A is the IGMP querier.
Switch A's GigabitEthernet 1/0/1 belongs to VLAN 1024, GigabitEthernet 1/0/2
■
through GigabitEthernet 1/0/4 belong to VLAN 11 through VLAN 13
respectively, and Host A through Host C are attached to GigabitEthernet 1/0/2
through GigabitEthernet 1/0/4 of Switch A.
Configure the multicast VLAN feature so that Router A just sends multicast
■
data to VLAN 1024 rather than to each VLAN when the three hosts attached to
Switch A need the multicast data.
Use the command...
multicast-vlan vlan-id
enable
multicast-vlan vlan-id
subvlan vlan-list
Use the command...
display multicast-vlan
[ vlan-id ]
Remarks
Required
Disabled by default
Required
No sub-VLAN by default.
Remarks
Available in any view