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Configuration Guide - IP Multicast

CloudEngine 8800, 7800, 6800, and 5800 V200R005C00

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 SSM Mapping

Configuring IGMP SSM Mapping

Pre-configuration Tasks

Enabling IGMP

Context

The source-specific multicast (SSM) model allows IGMPv3 hosts to specify the multicast sources which they want to receive data from. However, some hosts can only run IGMPv1 or IGMPv2. To enable these hosts to use the SSM service, configure IGMP SSM mapping on the switch. IGMP SSM mapping is implemented based on static SSM mapping entries on the switch. The switch converts (*, G) information in IGMPv1 and IGMPv2 Report messages to (S, G) information according to static SSM mapping entries to provide the SSM service for IGMPv1 and IGMPv2 hosts. By default, SSM group addresses range from 232.0.0.0 to 232.255.255.255. You can expand this range if required. For details, see (Optional) Configuring an SSM Group Policy.

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. For a Layer 3 sub-interface, run the following commands to configure termination of single-tagged packets on it.
    1. Run quit

      Return to the system view.

    2. Run interface interface-type interface-number.subinterface-number

      The Layer 3 sub-interface view is displayed.

      The subinterface-number parameter must specify a Layer 3 sub-interface number on an Ethernet interface that has been switched to the Layer 3 mode.

    3. Run dot1q termination vid vid

      Termination of Dot1q packets is configured on the Layer 3 sub-interface.

      By default, the termination of Dot1q packets is not configured on a Layer 3 sub-interface.

  5. Run igmp ssm-mapping enable

    IGMP SSM mapping is enabled on the interface.

    By default, IGMP SSM mapping is disabled on an interface.

    Enable IGMPv3 on switch interfaces to ensure that hosts running any IGMP version on a network segment can obtain the SSM service.

  6. Run quit

    Return to the system view.

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

    The IGMP view is displayed.

  8. Run ssm-mapping group-address { group-mask | group-mask-length } source-address

    An SSM mapping rule is configured to map a group address to a multicast source.

    By default, no SSM mapping rule is configured.

  9. Run commit

    The configuration is committed.

Verifying the Configuration

Run the following commands in any view to check the configured mapping entries and whether IGMP SSM mapping is enabled on the interface.

  • Run the display igmp [ vpn-instance vpn-instance-name | all-instance ] group [ group-address | interface interface-type interface-number ]* ssm-mapping [ verbose ] command to check information about group memberships established with IGMP SSM mapping.
  • Run the display igmp [ vpn-instance vpn-instance-name | all-instance ] ssm-mapping { group [ group-address ] | interface [ interface-type interface-number ] } command to check SSM mapping entries configured and whether IGMP SSM mapping is enabled on an interface.
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Updated: 2019-04-20

Document ID: EDOC1100039595

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