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Configuring IGMP (Required)

The Internet Group Management Protocol (IGMP) manages the membership of hosts and routers in multicast groups. IGMP is an integral part of IP and must be enabled on all routers and hosts that need to receive IP mulitcasts. IGMP is automatically enabled on all broadcast interfaces when you configure PIM or DVMRP.

For more information on IGMP, see JUNOS Multicast Protocols Configuration Guide.

By default, the Services Router runs IGMPv2. However, you might still want to set the IGMP version explicitly on an interface, or all interfaces. Routers running different versions of IGMP negotiate the lowest common version of IGMP supported by hosts on their subnet. One host running IGMPv1 forces the Services Router to use that version and lose features important to other hosts.

To explicitly configure the IGMP version, perform these steps on each Services Router in the network:

  1. Navigate to the top of the configuration hierarchy in either the J-Web or CLI configuration editor.
  2. Perform the configuration tasks described in Table 49.
  3. If you are finished configuring the router, commit the configuration.
  4. Go on to one of the following procedures:

Table 49: Explicitly Configuring the IGMP version

Task

J-Web Configuration Editor

CLI Configuration Editor

Navigate to the Interface level in the configuration hierarchy.
  1. In the J-Web interface, select Configuration>View and Edit>Edit Configuration.
  2. Next to Protocols, click Configure or Edit.
  3. Next to Igmp, click Configure or Edit.
  4. Next to Interface, click Add new entry.

From the [edit] hierarchy level, enter

edit protocols igmp

Set the IGMP version. By default, the Services Router uses IGMPv2, but this version can be changed through negotiation with hosts unless explicitly configured.
  1. In the Interface name box, type the name of the interface, or all.
  2. In the Version box, type the version number: 1, 2, or 3.
  3. Click OK.
  1. Set the interface value to the interface name, or all. For example:

    set igmp interface all

  2. Set the version value to 1, 2, or 3. For example:

    set igmp interface all version 2

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