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Configuration Guide - IP Multicast

CloudEngine 8800, 7800, 6800, and 5800 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 IGMP Host Tracking

Configuring IGMP Host Tracking

Context

When an IGMPv3 host leaves a multicast group on a network running IGMPv3, an IGMP querier sends a Group-Specific Query message to the multicast group address. 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. 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.

Host tracking supports only IGMPv3, and can be configured only on interfaces connected to only IGMPv3 capable hosts.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. 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.

    The mode switching function takes effect when the interface only has attribute configurations (for example, shutdown and description configurations). Alternatively, if configuration information supported by both Layer 2 and Layer 3 interfaces exists (for example, mode lacp and lacp system-id configurations), no configuration that is not supported after the working mode of the interface is switched can exist. If unsupported configurations exist on the interface, delete the configurations first and then run the undo portswitch command.

    NOTE:

    If many Ethernet interfaces need to be switched to Layer 3 mode, run the undo portswitch batch interface-type { interface-number1 [ to interface-number2 ] } &<1-10> command in the system view to switch these interfaces to Layer 3 mode in batches.

  4. Run igmp explicit-tracking

    The host tracking function is enabled on the interface.

    By default, host tracking is disabled on an interface.

  5. Run commit

    The configuration is committed.

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Updated: 2019-04-20

Document ID: EDOC1100075361

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