Cisco Systems 3560 Manual Do Utilizador

This chapter describes how to configure IP multicast routing on the Catalyst 3560 switch. IP multicasting 
is a more 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 switches 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.

To use the IP multicast routing features, the switch must be running the IP services image (formerly 
known as the enhanced multilayer image [EMI]). To use the PIM stub routing feature, theswitch  can be 
running the IP base image.

For complete syntax and usage information for the commands used in this chapter, see the Cisco IOS IP 
Command Reference, Volume 3 of 3: Multicast, Release 12.2 from the Cisco.com page under 
Documentation > Cisco IOS Software > 12.2 Mainline > Command References.

This chapter consists of these sections:

For information on configuring the Multicast Source Discovery Protocol (MSDP), see