Chapter 12 Multicast Vlan Configuration; Multicast Vlan Introduction; Multicast Vlan Configuration; Multicast Vlan Configuration Task List - Digitalchina Networks DCS-3950 series Manual

Chapter 12 Multicast VLAN

12.1 Multicast VLAN Introduction

Based on the current multicast program ordering method, when users in different
VLANs order programs, each VLAN will copy a multicast stream within itself. This method
will waste lots of bandwidth. So by configuring multicast VLAN, we add the ports of a
switch to a multicast VLAN, after enabling the IGMP Snooping function, we can make
users in different VLANs share a same multicast VLAN, and limit the transmission of
multicast stream within only one multicast VLAN. Thus, bandwidth will be saved. Since the
multicast VLAN and user VLAN are completely isolated, both the security and the
bandwidth can be guaranteed. After we configure the multicast VLAN, we can ensure that
the multicast information stream can be sent to users without a stop.

12.2 Multicast VLAN Configuration

12.2.1 Multicast VLAN Configuration Task List

1. Start multicast VLAN function
2. Configure IGMP Snooping
1．Start multicast VLAN function
Command
VLAN configuration mode
multicast-vlan
no multicast-vlan
multicast-vlan association <vlan-list>
no multicast-vlan association <vlan-list>
2. Configure IGMP Snooping
Command
Global configuration mode
ip igmp snooping vlan <vlan-id>
no ip igmp snooping vlan <vlan-id>
DCS-3950 series Ethernet switch manual
Configuration
Explanation
Configure a VLAN to start the multicast
VLAN function. The ' no multicast-vlan'
command will disable the multicast VLAN
function of the VLAN.
Associate a multicst VLAN to other VLANs.
The ' no multicast-vlan association
<vlan-list>' command will delete the
associated VLANs of the multicast VLAN.
Explanation
Start the IGMP Snooping function of the
multicast vlan. 'no ip igmp snooping vlan
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