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Configuration Guide - IP Multicast

CloudEngine 12800 and 12800E V200R005C10

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, PIM (IPv4), PIM (IPv6), MSDP, multicast VPN, multicast route management (IPv4), multicast route management (IPv6), IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN, multicast network management.
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Configuring the Host Tracking Function

Configuring the Host Tracking Function


On a network running IGMPv3, IGMPv3 hosts in a VLAN receive multicast traffic through multicast groups. When an IGMPv3 host leaves a multicast group, the IGMP querier sends a Group-Specific Query message to the host. If the querier does not receive any response from the host within the specified time, it considers that the host has left the multicast group and deletes the corresponding forwarding entry. While the IGMP querier waits for a response from the host, the multicast device continues to forward multicast traffic to the host. This delays the switching of multicast programs and wastes bandwidth.

You can configure the host tracking function to address this problem. After this function is enabled, the IGMP querier will create an entry when a host joins a group. Upon receipt of a Leave message sent by a host, the IGMP querier considers that the host has left the multicast group and stops sending Group-Specific Query messages.

Before configuring host tracking in a VLAN, ensure that IGMP snooping can process IGMPv3 messages in the VLAN. Host tracking applies only to scenarios where multicast hosts and multicast devices are both running IGMPv3.


  1. Run system-view

    The system view is displayed.

  2. Run vlan vlan-id

    The VLAN view is displayed.

  3. Run igmp snooping explicit-tracking

    The host tracking function is enabled in the VLAN.

    By default, host tracking is disabled in a VLAN.

  4. Run commit

    The configuration is committed.

Updated: 2019-04-20

Document ID: EDOC1100074724

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