Zyxel VES-1624FT-55A [153/312] Multicast vlan overview

Zyxel VES-1624FT-55A [153/312] Multicast vlan overview
VES-1624FT-55A User’s Guide
153
CHAPTER 23
Multicast VLAN
This chapter describes the Multicast VLAN screens.
23.1 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 IP DSLAM 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 IP DSLAM 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 IP DSLAM does not forward traffic
to this PVC even if the subscriber’s port has joined the multicast VLAN.
Since the IP DSLAM might change the subscribers VLAN ID to the multicast VLAN ID,
both the subscribers port and the Ethernet port should join the multicast VLAN.
23.2 MVLAN Status Screen
Use this screen to look at a summary of all multicast VLAN on the IP DSLAM. To open this
screen, click Advanced Application > Multicast VLAN.
Figure 78 MVLAN Status

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