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Cisco ASA Series CLI Configuration Guide
Chapter 1 Configuring Multicast Routing
Information About Multicast Routing
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Multicast Group Concept, page 1-2
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Stub Multicast Routing
Stub multicast routing provides dynamic host registration and facilitates multicast routing. When
configured for stub multicast routing, the ASA acts as an IGMP proxy agent. Instead of fully
participating in multicast routing, the ASA forwards IGMP messages to an upstream multicast router,
which sets up delivery of the multicast data. When configured for stub multicast routing, the ASA cannot
be configured for PIM.
The ASA supports both PIM-SM and bidirectional 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 ASA is the PIM RP, use the untranslated outside address of the ASA 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.
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.
Clustering
Multicast routing supports clustering. In Layer 2 clustering, the master unit sends all multicast routing
packets and data packets until fast-path forwarding is established. After fast-path forwarding is
established, slave units may forward multicast data packets. All data flows are full flows. Stub
forwarding flows are also supported. Because only one unit receives multicast packets in Layer 2
Summary of Contents for 5505 - ASA Firewall Edition Bundle
Page 28: ...Glossary GL 24 Cisco ASA Series CLI Configuration Guide ...
Page 61: ...P A R T 1 Getting Started with the ASA ...
Page 62: ......
Page 219: ...P A R T 2 Configuring High Availability and Scalability ...
Page 220: ......
Page 403: ...P A R T 2 Configuring Interfaces ...
Page 404: ......
Page 499: ...P A R T 2 Configuring Basic Settings ...
Page 500: ......
Page 533: ...P A R T 2 Configuring Objects and Access Lists ...
Page 534: ......
Page 601: ...P A R T 2 Configuring IP Routing ...
Page 602: ......
Page 745: ...P A R T 2 Configuring Network Address Translation ...
Page 746: ......
Page 845: ...P A R T 2 Configuring AAA Servers and the Local Database ...
Page 846: ......
Page 981: ...P A R T 2 Configuring Access Control ...
Page 982: ......
Page 1061: ...P A R T 2 Configuring Service Policies Using the Modular Policy Framework ...
Page 1062: ......
Page 1093: ...P A R T 2 Configuring Application Inspection ...
Page 1094: ......
Page 1191: ...P A R T 2 Configuring Unified Communications ...
Page 1192: ......
Page 1333: ...P A R T 2 Configuring Connection Settings and QoS ...
Page 1334: ......
Page 1379: ...P A R T 2 Configuring Advanced Network Protection ...
Page 1380: ......
Page 1475: ...P A R T 2 Configuring Modules ...
Page 1476: ......
Page 1549: ...P A R T 2 Configuring VPN ...
Page 1550: ......
Page 1965: ...P A R T 2 Configuring Logging SNMP and Smart Call Home ...
Page 1966: ......
Page 2059: ...P A R T 2 System Administration ...
Page 2060: ......
Page 2098: ...1 8 Cisco ASA Series CLI Configuration Guide Chapter 1 Troubleshooting Viewing the Coredump ...
Page 2099: ...P A R T 2 Reference ...
Page 2100: ......