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CLI-based Configuration Guide - IP Multicast

AR100, AR120, AR160, AR1200, AR2200, AR3200, and AR3600 V300R003

This document provides the basic concepts, configuration procedures, and configuration examples of the interfaces supported by the device.
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Configuring IGMP Limit

Configuring IGMP Limit

Pre-configuration Tasks

Configuring Basic IGMP Functions

Context

As defined in multicast protocols, group members can join or leave a group anytime, anywhere, and the number of members in a group is unlimited. If too many users stream videos at the same time, a large amount of bandwidth is consumed, degrading the forwarding performance of the multicast device. The IGMP limit function solves this problem by restricting the number of multicast groups allowed in the system, in a virtual private network (VPN) instance, and on an interface. This allows users who have joined multicast groups to stream high-quality videos. When the router receives an IGMP Report message and needs to create a new IGMP entry, it checks whether the number of IGMP entries exceeds the limit. If not, the router creates the IGMP entry and forwards multicast data to the multicast group.

The global IGMP limit restricts the number of entries on all interfaces. The IGMP limit configured in a VPN instance restricts the number of IGMP entries in the VPN instance. The IGMP limit configured on an interface restricts the number of IGMP entries on the interface.

The router counts IGMP entries as follows:
  • Counts each (*, G) entry as one entry.
  • Counts each (S, G) entry as one entry.
  • Counts each (*, G) entry established with IGMP SSM mapping as one entry but does not count (S, G) entries converted from (*, G) entries.
NOTE:

To apply global, VPN-based, and interface-based IGMP limits together on a switch, you are advised to set the IGMP limit values following this rule: global IGMP limit value > IGMP limit value in a VPN instance > IGMP limit value on an interface.

Procedure

  • Configuring the global IGMP limit
    1. Run system-view

      The system view is displayed.

    2. Run igmp global limit number

      The maximum number of IGMP entries allowed in the system is configured.

  • Configuring the IGMP limit in a VPN instance
    1. Run system-view

      The system view is displayed.

    2. Run igmp [ vpn-instance vpn-instance-name ]

      The IGMP view of a public or VPN instance is displayed.

    3. Run limit number

      The maximum number of IGMP entries allowed in the public or VPN instance is configured.

  • Configuring the IGMP limit on an interface
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. Run igmp limit number [ except { acl-number | acl-name acl-name } ]

      The maximum number of IGMP entries allowed on the interface is configured.

      If except is not specified in the command, the configured limit value limits the number of dynamic (*, G) and (S, G) entries.

      Before specifying except, configure the associated ACL. The interface then filters the received IGMP Report messages according to the ACL. The IGMP limit does not apply to the entries allowed by the ACL.

Verifying the Configuration

  • Run the display igmp [ vpn-instance vpn-instance-name | all-instance ] interface [ interface-type interface-number | up | down ] [ verbose ] command to check the IGMP configuration and running status on an interface.

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Updated: 2019-03-06

Document ID: EDOC1100069332

Views: 18434

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