24-2
Cisco ASA 5500 Series Configuration Guide using ASDM
OL-20339-01
Chapter 24 Configuring Multicast Routing
Licensing Requirements for Multicast Routing
Stub Multicast Routing
Stub multicast routing provides dynamic host registration and facilitates multicast routing. When
configured for stub multicast routing, the adaptive security appliance acts as an IGMP proxy agent.
Instead of fully participating in multicast routing, the adaptive security appliance forwards IGMP
messages to an upstream multicast router, which sets up delivery of the multicast data. When configured
for stub multicast routing, the adaptive security appliance cannot be configured for PIM.
The adaptive security appliance 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.
PIM Multicast Routing
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.
Note If the adaptive security appliance is the PIM RP, use the untranslated outside address of the adaptive
security appliance as the RP address.
Multicast Group Concept
Multicast is based on the concept of a group. An arbitrary group of receivers expresses an interest in
receiving a particular data stream. This group does not have any physical or geographical
boundaries—the hosts can be located anywhere on the Internet. Hosts that are interested in receiving data
flowing to a particular group must join the group using IGMP. Hosts must be a member of the group to
receive the data stream. For information about how to configure multicast groups, see the “Configuring
a Multicast Group” section on page 24-14.
Multicast Addresses
Multicast addresses specify an arbitrary group of IP hosts that have joined the group and want to receive
traffic sent to this group.
Licensing Requirements for Multicast Routing
Model License Requirement
All models Base License.
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