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Chapter 36 Multicast VLAN
36.1 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.
36.2 Multicast VLAN Configuration
Task List
1. Enable the multicast VLAN function
2. Configure the IGMP Snooping
3. Configure the MLD Snooping
1. Enable the multicast VLAN function
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.
multicast-vlan association interface
(ethernet | port-channel|) IFNAME out-tag
<tag-id>
Associate the specified port with the multicast
VLAN, so the associated ports are able to
receive the multicast flow. The no command
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