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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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Configuring MLD On-Demand

Configuring MLD On-Demand

Context

In a standard Multicast Listener Discovery (MLD) working process, a querier periodically sends Query messages and receives Multicast Listener Report and Done messages from the receiver hosts to learn information about group members. If group members on a network seldom change, you can configure MLD on-demand on the querier. After MLD on-demand is configured on the querier, the querier does not send Query messages, reducing MLD packets exchanged between the querier and receiver hosts. The querier maintains group membership according to requirements of receiver hosts without actively sending Query messages.

After MLD on-demand is configured, the switch:

  • Does not send MLD Query messages through the interface.
  • Generates MLD group entries that will never age out after receiving Multicast Listener Report messages.
  • Deletes MLD group entries immediately when receiving Multicast Listener Done messages.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. (Optional) On an Ethernet interface, run undo portswitch

    The interface is switched to Layer 3 mode.

    By default, an Ethernet interface works in Layer 2 mode.

  4. Run mld on-demand

    MLD on-demand is enabled on the interface. The interface then does not send MLD Query messages and MLD group entries on the interface are never aged.

    By default, a querier does not maintain group memberships according to requirements of group members, and dynamic entries are aged out when the aging time expires.

    NOTE:

    If dynamic MLD entries have been generated on the querier, run the reset mld group command to clear these dynamic MLD entries before running the mld on-demand command.

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Updated: 2019-04-08

Document ID: EDOC1100065742

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