Manual

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Москва, Новозаводская ул., 18, стр. 1
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Chapter 30 Multicast VLAN
30.1 Introductions to Multicast VLAN
Based on current multicast order method, when orders from users in different VLAN, each
VLAN will copy a multicast traffic in this VLAN, which is a great waste of the bandwidth. By
configuration of the multicast VLAN, we add the switch port to the multicast VLAN, with the
IGMP Snooping/MLD Snooping functions enabled, users from different VLAN will share the
same multicast VLAN. The multicast traffic only exists within a multicast VLAN, so the
bandwidth is saved. As the multicast VLAN is absolutely separated from the user VLAN,
security and bandwidth concerns can be met at the same time, after the multicast VLAN is
configured, the multicast traffic will be continuously sent to the users.
30.2 Multicast VLAN Configuration Task List
Enable the multicast VLAN function
Configure the IGMP Snooping
Configure the MLD Snooping
1. Enable the multicast VLAN function
Command
Explanation
VLAN configuration mode
multicast-vlan
no multicast-vlan
Configure a VLAN and enable the multicast
VLAN on it. The “no multicast-vlan”
command disables the multicast function on
the VLAN.
multicast-vlan association <vlan-list>
no multicast-vlan association <vlan-list>
Associate a multicast VLAN with several
VLANs. The “no" form of this command
deletes the related VLANs associated with the
multicast VLAN.
2. Configure the IGMP Snooping
Command
Explanation
Global Mode
ip igmp snooping vlan <vlan-id>
no ip igmp snooping vlan <vlan-id>
Enable the IGMP Snooping function on the
multicast VLAN. The "no” form of this
command disables the IGMP Snooping on the
multicast VLAN.