Cisco 7604 Configuration Guide - Page 185
Configuring Multicast Routing, Multicast Routing Overview
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9 C H A P T E R Configuring Multicast Routing This chapter describes how to configure multicast routing. This chapter includes the following sections: • 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 Multicast Routing Overview The FWSM supports both Stub Multicast Routing and PIM multicast routing. However, you cannot configure both concurrently on a single FWSM. Note Only the UDP transport layer is supported for multicast routing. 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. OL-20748-01 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM 9-1
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