
IES-1248-51V User’s Guide
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CHAPTER 22
Multicast VLAN
This chapter describes the Multicast VLAN screens.
22.1 Multicast VLAN Overview
Multicast VLAN allows one single multicast VLAN to be shared among different
subscriber VLANs on the network. This improves bandwidth utilization by reducing
multicast traffic in the subscriber VLANs and simplifies multicast group
management.
When the IES-1248-51V forwards traffic to a subscriber port, it tries to forward
traffic to a normal PVC with the same VLAN ID. If this PVC does not exist, the IES-
1248-51V uses the super channel instead. This applies to all downstream traffic,
not just multicast traffic.
It is suggested to use a super channel for multicast VLAN. If a normal PVC is used
and the multicast VLAN ID is not the same as the PVC’s VID, the IES-1248-51V
does not forward traffic to this PVC even if the subscriber’s port has joined the
multicast VLAN.
Since the IES-1248-51V might change the subscriber’s VLAN ID to the multicast
VLAN ID, both the subscriber’s port and the Ethernet port should join the multicast
VLAN.
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