Multicast Routing Overview - Cisco 7604 Configuration Manual

Configuring Multicast Routing
This chapter describes how to configure multicast routing. This chapter includes the following sections:
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Multicast Routing Overview

The FWSM supports both Stub Multicast Routing and PIM multicast routing. However, you cannot
configure both concurrently on a single FWSM.
Only the UDP transport layer is supported for multicast routing.
Note
Stub multicast routing provides dynamic host registration and facilitates multicast routing. When
configured for Stub Multicast Routing, the FWSM acts as an IGMP proxy agent. Instead of fully
participating in multicast routing, the FWSM forwards IGMP messages to an upstream multicast router,
which sets up delivery of the multicast data. When configured for Stub Multicast Routing, the FWSM
cannot be configured for PIM.
The FWSM supports both PIM-SM and bi-directional PIM. PIM-SM is a multicast routing protocol that
uses the underlying unicast routing information base or a separate multicast-capable routing information
base. It builds unidirectional shared trees rooted at a single Rendezvous Point per multicast group and
optionally creates shortest-path trees per multicast source.
Bi-directional PIM is a variant of PIM-SM that builds bi-directional shared trees connecting multicast
sources and receivers. Bi-directional trees are built using a DF election process operating on each link
of the multicast topology. With the assistance of the DF, multicast data is forwarded from sources to the
Rendezvous Point, and therefore along the shared tree to receivers, without requiring source-specific
state. The DF election takes place during Rendezvous Point discovery and provides a default route to the
Rendezvous Point.
Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM
OL-20748-01
Multicast Routing Overview, page 9-1
Enabling Multicast Routing, page 9-2
Configuring IGMP Features, page 9-2
Configuring Stub Multicast Routing, page 9-5
Configuring a Static Multicast Route, page 9-6
Configuring PIM Features, page 9-6
For More Information About Multicast Routing, page 9-8
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