Switch Features 79
Internet Group Management Protocol
The Internet Group Management Protocol (IGMP) is used by IPv4 systems
(hosts and routers) to report their IP multicast group memberships to any
neighboring multicast routers. PowerConnect 7000 Series switches perform
the “multicast router part” of the IGMP protocol, which means it collects the
membership information needed by the active multicast router.
IGMP Proxy
The IGMP Proxy feature allows the switch to act as a proxy for hosts by
sending IGMP host messages on behalf of the hosts that the switch
discovered through standard IGMP router interfaces.
Protocol Independent Multicast—Dense Mode
Protocol Independent Multicast (PIM) is a standard multicast routing
protocol that provides scalable inter-domain multicast routing across the
Internet, independent of the mechanisms provided by any particular unicast
routing protocol. The Protocol Independent Multicast-Dense Mode (PIM-
DM) protocol uses an existing Unicast routing table and a Join/Prune/Graft
mechanism to build a tree. PIM-DM creates source-based shortest-path
distribution trees, making use of reverse path forwarding (RPF).
Protocol Independent Multicast—Sparse Mode
Protocol Independent Multicast-Sparse Mode (PIM-SM) is used to efficiently
route multicast traffic to multicast groups that may span wide area networks,
and where bandwidth is a constraint. PIM-SM uses shared trees by default
and implements source-based trees for efficiency. This data threshold rate is
used to toggle between trees.
Protocol Independent Multicast—Source Specific Multicast
Protocol Independent Multicast—Source Specific Multicast (PIM-SSM) is a
subset of PIM-SM and is used for one-to-many multicast routing
applications, such as audio or video broadcasts. PIM-SSM does not use shared
trees.
Protocol Independent Multicast IPv6 Support
PIM-DM and PIM-SM support IPv6 routes.
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