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S600-E V200R012C00 Configuration Guide - IP Multicast

This document describes the configurations of IP multicast, including IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN replication, controllable multicast, multicast network management.
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Enabling IGMP Snooping

Enabling IGMP Snooping


Other IGMP snooping functions can be configured only after IGMP snooping is enabled globally. Other IGMP snooping functions take effect in a VLAN only after IGMP snooping is enabled in the VLAN.

By default, IGMP snooping is disabled globally on the switch.


  1. Run system-view

    The system view is displayed.

  2. Run igmp-snooping enable

    IGMP snooping is enabled globally.

  3. Run vlan vlan-id

    The VLAN view is displayed.

  4. (Optional) Run l2-multicast forwarding-mode { ip | mac }

    The multicast forwarding mode in the VLAN is set to IP address-based or MAC address-based forwarding.

    By default, multicast flows are forwarded based on IP addresses.

    • Configure the forwarding mode of multicast flows in the VLAN before IGMP snooping is enabled in the VLAN. Enable IGMP snooping in the VLAN for the configuration to take effect.

    • After the multicast data forwarding mode is set to MAC address-based forwarding in a VLAN using this command, the VLAN cannot be configured as a multicast VLAN.

    • If the device forwards multicast data packets based on MAC addresses, do not use a group address on the network if the group address maps to the same multicast MAC address as a multicast IP address reserved for a protocol. Otherwise, the protocol that uses this multicast IP address cannot run normally. For example, OSPF uses to send protocol packets. This multicast IP address maps to multicast MAC address 01-00-5E-00-00-05. If multicast data packets are forwarded based on MAC addresses and use multicast IP address (also mapping to 01-00-5E-00-00-05), the OSPF protocol cannot run normally.

  5. (Optional) Run l2-multicast router-port-discard

    The switch is disabled from forwarding multicast data to router ports in a VLAN.


    Before disabling the switch from forwarding multicast data to router ports in a VLAN, disable IGMP snooping in the VLAN. After setting the forwarding mode, enable IGMP snooping in the VLAN for the configuration to take effect.

  6. Run igmp-snooping enable

    IGMP snooping is enabled in the VLAN.

    Run the igmp-snooping enable [ vlan { vlan-id1 [ to vlan-id2 ] } &<1-10> ] command in the system view to enable IGMP snooping in multiple VLANs.

    IGMP snooping cannot be used with N:1 (N > 1) VLAN mapping.

Updated: 2018-09-01

Document ID: EDOC1100037948

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