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Configuring Multicast Services
This chapter describes how to configure multicast services, including Cisco Group Management
Protocol (CGMP), Internet Group Management Protocol (IGMP) snooping, and GARP Multicast
Registration Protocol (GMRP) on the Catalyst enterprise LAN switches.
For complete syntax and usage information for the commands used in this chapter, refer to the Command
Note
Reference—Catalyst 4000 Family, Catalyst 2948G, and Catalyst 2980G Switches.
This chapter consists of these sections:
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Understanding How Multicasting Works
These sections describe how multicasting works on the Catalyst enterprise LAN switches:
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Understanding Multicasting and Multicast Services Operation
CGMP, IGMP snooping, and GMRP manage multicast traffic in switches by allowing directed switching
of IP multicast traffic.
Switches can use CGMP, IGMP snooping, or GMRP to dynamically configure switch ports so that IP
multicast traffic is forwarded only to those ports associated with IP multicast hosts.
Note
For more information on IP multicast and IGMP, refer to RFC 1112. GMRP is described in IEEE 802.1p.
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Understanding How Multicasting Works, page 15-1
Configuring CGMP, page 15-4
Configuring GMRP, page 15-8
Configuring Multicast Router Ports and Group Entries, page 15-16
Understanding Multicasting and Multicast Services Operation, page 15-1
Joining a Multicast Group, page 15-2
Leaving a Multicast Group, page 15-2
Understanding GMRP Operation, page 15-3
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
C H A P T E R
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15-1
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