Cisco WS-C2960-24TC-L Software Guide - Page 285
Configuring Multicast Services, Understanding How Multicasting Works - rfc
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15 C H A P T E R 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. Note For complete syntax and usage information for the commands used in this chapter, refer to the Catalyst 4500 Series, Catalyst 2948G, and Catalyst 2980G Switches Command Reference. This chapter consists of these sections: • Understanding How Multicasting Works, page 15-1 • Configuring CGMP, page 15-4 • Configuring GMRP, page 15-9 • Configuring Multicast Router Ports and Group Entries, page 15-15 • Filtering IGMP Traffic, page 15-17 Understanding How Multicasting Works The following sections describe how multicasting works on the Catalyst enterprise LAN switches. 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 ports that are associated with IP multicast hosts. Note For more information on IP multicast and IGMP, see RFC 1112. GMRP is described in IEEE 802.1p. CGMP and IGMP software components run on the Cisco router and the switch. A CGMP/IGMP-capable IP multicast router sees all IGMP packets and can inform the switch when specific hosts join or leave IP multicast groups. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 15-1
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