Cisco 3750G - Catalyst Integrated Wireless LAN Controller, Руководство по настройке

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C H A P T E R
40-1
Catalyst 3750 Switch Software Configuration Guide
OL-8550-02
40
Configuring IP Multicast Routing
This chapter describes how to configure IP multicast routing on the Catalyst 3750 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 sent to a group. However, only the members of a group receive the message.
To use this feature, the stack master must be running the IP services image (formerly known as the
enhanced multilayer image [EMI]). Unless otherwise noted, the term
switch refers to a standalone switch
and to a switch stack.
Note
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 .
This chapter consists of these sections:
• Understanding Cisco’s Implementation of IP Multicast Routing, page 40-2
•
Multicast Routing and Switch Stacks, page 40-8
• Configuring IP Multicast Routing, page 40-9
•
Configuring Advanced PIM Features, page 40-24
• Configuring Optional IGMP Features, page 40-28
•
Configuring Optional Multicast Routing Features, page 40-33
• Configuring Basic DVMRP Interoperability Features, page 40-38
•
Configuring Advanced DVMRP Interoperability Features, page 40-43
• Monitoring and Maintaining IP Multicast Routing, page 40-51
For information on configuring the Multicast Source Discovery Protocol (MSDP), see Chapter 41,
“Configuring MSDP.”