Dynamic IGMP Configuration Overview

The Internet Group Management Protocol (IGMP) is a host to router signaling protocol for IPv4 used to support IP multicasting. This protocol manages the membership of hosts and routers in multicast groups. IP hosts use IGMP to report their multicast group memberships to any immediately neighboring multicast routers. Multicast routers use IGMP to learn, for each of their attached physical networks, which groups have members.

Subscriber access supports the configuration of IGMP within the dynamic profiles hierarchy. By specifying IGMP statements within a dynamic profile, you can dynamically apply IGMP configuration when a subscriber connects to an interface using a particular access technology (DHCP), enabling the subscriber to access a carrier (multicast) network.

Dynamic IGMP consists of a subset of the full range of IGMP capabilities available for static IGMP configuration, applied to dynamic interfaces by means of a dynamic profile. For detailed information about static IGMP configuration, see Configuring IGMP. Much of the static configuration documentation is directly applicable to dynamic IGMP. Note that the following statements that appear in the dynamic IGMP CLI hierarchy are configurable, but have no effect: accounting, group-threshold, log-interval, and no-accounting. These statements are not needed at a subscriber level , where typically no more than tens of joins are expected.

Refer to the Multicast Protocols User Guide for a comprehensive understanding of Junos OS support for multicast protocols.