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NE40E V800R010C10SPC500 Configuration Guide - IP Multicast 01

This is NE40E V800R010C10SPC500 Configuration Guide - IP Multicast
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Associating a Multicast VLAN with Specified User VLANs

Associating a Multicast VLAN with Specified User VLANs

If users in different VLANs are interested in data from the same multicast source, create a multicast VLAN on a Device and associate this multicast VLAN with the user VLANs. Then, the Device uses the multicast VLAN to manage the multicast source and multicast group members, simplifying multicast management and improving bandwidth usage.


The multicast VLAN function involves two concepts: multicast VLAN and user VLAN.

  • A multicast VLAN is a VLAN to which router interfaces connected to multicast sources belong. A multicast VLAN is used to aggregate multicast flows.

  • A user VLAN is a VLAN to which user hosts belong. A user VLAN is used to receive data from a multicast VLAN.


  1. Run system-view

    The system view is displayed.

  2. Run vlan vlan-id

    A multicast VLAN is created, and the multicast VLAN view is displayed.

  3. Run igmp-snooping enable

    Internet Group Management Protocol (IGMP) snooping is enabled for the multicast VLAN.

  4. Run multicast-vlan enable

    The multicast VLAN function is enabled.

  5. Run multicast-vlan user-vlan { { vlan-id1 [ to vlan-id2 ] } &<1-10> }

    The multicast VLAN is associated with the specified user VLANs.

    A multicast VLAN can be associated with multiple user VLANs, but a user VLAN can be associated with only one multicast VLAN.

  6. (Optional) Run multicast-vlan igmp-querier-election user-vlan { vlan-id1 [ to vlan-id2 ] } &<1-10>

    Querier election is enabled for the user VLANs.

    If two routers are connected to the same user VLAN and the multicast VLAN function is enabled, the user VLAN will receive two copies of identical multicast data from the two routers, consuming bandwidth resources. To resolve this issue, run the multicast-vlan igmp-querier-election user-vlan command to enable the querier election function for user VLANs. With this function enabled, a router that does not win a querier election will delete forwarding entries and will not create forwarding entries after receiving Report messages from user VLANs. As a result, the router will not send multicast data to the user VLAN.

    Before enabling querier election, ensure that the igmp-snooping send-query source-address command has been run on each router to configure a source IP address for the IGMP Query messages to be sent by the querier.

  7. Run port isolate-state exclude multicast

    Multicast traffic and packets are not isolated in the VLAN.

  8. Run commit

    The configuration is committed.

Updated: 2019-01-03

Document ID: EDOC1100055017

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