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Configuration Guide - IP Multicast

S7700 and S9700 V200R013C00

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, IPv4 PIM, IPv6 PIM, MSDP, multicast VPN, layer 3 multicast CAC, IPv4 multicast route management, IPv6 multicast route management, IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN replication, layer 2 multicast CAC, multicast network management.
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Enabling MLD Snooping

Enabling MLD Snooping

Context

Global MLD snooping must be enabled before other MLD snooping configurations can be performed. Enabling MLD snooping in a VLAN is required for other MLD snooping configurations to take effect in the VLAN. If MLD snooping is disabled in a VLAN, other MLD snooping configurations can be performed but do not take effect until MLD snooping is enabled in the VLAN.

By default, MLD snooping is disabled globally.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run mld-snooping enable

    MLD 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, the IP address-based forwarding mode is used.

    NOTE:
    • Set the multicast forwarding mode before enabling MLD snooping in the VLAN. The specified multicast forwarding mode takes effect only after MLD snooping is enabled.

    • A VLAN cannot be configured as a multicast VLAN after MAC address-based forwarding is configured in the VLAN using this command.

    • If the switch forwards multicast data packets based on MAC addresses, do not use a group address that maps to the same multicast MAC address as a multicast IP address reserved for a protocol. Otherwise, the protocol that uses the multicast IP address cannot run normally. For example, OSPF uses FF02::5 to send protocol packets. This multicast IP address maps to multicast MAC address 33-33-00-00-00-05. If multicast data packets are forwarded based on MAC addresses and use multicast IP address FF13::5 (also mapping to 33-33-00-00-00-05), the OSPF protocol cannot run normally.

    • If the VLANIF interface corresponding to a VLAN is bound to a VPN instance, only the MAC address-based forwarding mode can be used in this VLAN. To use the IP address-based forwarding mode, configure this VLAN as a user VLAN and another VLAN as a multicast VLAN. In this way, multicast flows can be replicated to the user VLAN from the multicast VLAN.

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

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

    NOTE:

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

  6. Run mld-snooping enable

    MLD snooping is enabled in the VLAN.

    To enable MLD snooping in multiple VLANs, run mld-snooping enable [ vlan { vlan-id1 [ to vlan-id2 ] } &<1-10> ] command in the system view.

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

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Updated: 2019-04-08

Document ID: EDOC1100065742

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