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MULTICAST VLAN CONFIGURATION
Introduction to
Multicast VLAN
As shown in Figure 180, in the traditional multicast programs-on-demand mode,
when hosts that belong to different VLANs, Host A, Host B and Host C require
multicast programs on demand service, Router A needs to forward a separate
copy of the multicast data in each VLAN. This results in not only waste of network
bandwidth but also extra burden on the Layer 3 device.
Figure 180 Before and after multicast VLAN is enabled on the Layer 2 device
To solve this problem, you can enable the multicast VLAN feature on Switch A,
namely configure the VLANs to which these hosts belong as sub-VLANs of a
multicast VLAN on the Layer 2 device and enable Layer 2 multicast in the multicast
VLAN. After this configuration, Router A replicates the multicast data only within
the multicast VLAN instead of forwarding a separate copy of the multicast data to
each VLAN. This saves the network bandwidth and lessens the burden of the Layer
3 device.
Configuring Multicast
VLAN
Follow these steps to configure a multicast VLAN:
Multicast packet transmission
without Multicast VLAN
Source
Router A
Multicast packets
Multicast packet transmission
when Multicast VLAN runs
Source
Router A
Switch A
Host A
Receiver
Host B
Receiver
Host C
Receiver
VLAN 30
VLAN 20
VLAN 10
Switch A
Host A
Receiver
Host B
Receiver
Host C
Receiver
VLAN 30
VLAN 20
VLAN 10
To do… Use the command… Remarks
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