•
Enabling PIM on an interface also enables IGMP operation on that interface. (To participate in IP
multicasting, the multicast hosts, routers, and multilayer device must have IGMP operating. )
If you enable PIM on multiple interfaces, when most of these interfaces are not on the outgoing interface
list, and IGMP snooping is disabled, the outgoing interface might not be able to sustain line rate for
multicast traffic because of the extra replication.
Related Topics
Configuring Basic IP Multicast Routing, on page 290
Information About Basic IP Multicast Routing, on page 288
IP Multicast Routing Protocols, on page 22
Restrictions for Basic IP Multicast Routing
The following are the restrictions for IP multicast routing:
•
IP multicast routing is not supported on switches running the LAN base feature set.
•
High-availability support for Layer 3 multicast routing is not supported.
•
You cannot have a device stack containing a mix of Catalyst 3850 and Catalyst 3650 devices.
Information About Basic IP Multicast Routing
IP multicasting is an efficient way to use network resources, especially for bandwidth-intensive services such
as audio and video. IP multicast routing enables a host (source) to send packets to a group of hosts (receivers)
anywhere within the IP network by using a special form of IP address called the IP multicast group address.
The sending host inserts the multicast group address into the IP destination address field of the packet, and
IP multicast routers and multilayer devices forward incoming IP multicast packets out all interfaces that lead
to members of the multicast group. Any host, regardless of whether it is a member of a group, can send to a
group. However, only the members of a group receive the message.
For complete syntax and usage information for the commands used in this chapter, see the IP Multicast
Command Reference, Cisco IOS XE Release 3SE (Catalyst 3850 Switches). For information on configuring
the Multicast Source Discovery Protocol (MSDP), see the Catalyst 3850 Routing Configuration Guide.
Note
Related Topics
Configuring Basic IP Multicast Routing, on page 290
Prerequisites for Basic IP Multicast Routing, on page 287
Multicast Forwarding Information Base Overview
The device uses the Multicast Forwarding Information Base (MFIB) architecture and the Multicast Routing
Information Base (MRIB) for IP multicast.
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3.6E (Catalyst 3850 Switches)
288 OL-32598-01
Configuring Basic IP Multicast Routing
Restrictions for Basic IP Multicast Routing
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