Multicast (IGMP and PIM-DM)

For more information on configuring interfaces, see “Enable Bridge Mode on an IP Interface” on page 150.

Multicast (IGMP and PIM-DM)

The device can act as an IP multicast router, supporting IGMP and PIM-DM multicast protocols.

•IGMP — Internet Group Management Protocol, used by hosts to define multicast group membership. Multicast groups are identified by special IP addresses.

IGMP must be enabled on all IP interfaces that are directly connected to clients using multicast traffic.

•PIM-DM — Protocol Independent Multicast-Dense Mode routing protocol, used for multicast routing between remote sites. PIM-DM is also used to support site-to-site NBX conference calls.

PIM-DM must be enabled on all IP interfaces that multicast data will travel through to/from the multicast clients. This includes the GRE and IP interfaces.

Note Firewall rules must be established to allow PIM-DM and IGMP to be passed through the firewall between each set of security zone pairs that the multicast traffic must traverse. This includes between virtual zones such as a VPN zone, and this-device.

IGMP Setup

Internet Group Management Protocol (IGMP) is used by hosts to join or leave multicast groups.

You can manage and configure IGMP routing from the IGMP Setup page (Network > Configuration > IGMP). From this page you can:

•View the current IGMP configuration for the device and the current state of IGMP for each IP interface.

•Configure the global IGMP setup parameters for the device.

•Edit the IGMP configuration for an IP interface.

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