CHAPTER
21-1
Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
78-14064-04
21
Configuring IGMP Snooping
This chapter describes how to configure Internet Group Management Protocol (IGMP) snooping on the
Cisco 7600 series routers.
Note For complete syntax and usage information for the commands used in this chapter, refer to the
Cisco 7600 Series Router Cisco IOS Command Reference publication.
This chapter consists of these sections:
• Understanding How IGMP Snooping Works, page 21-1
• Default IGMP Snooping Configuration, page 21-6
• IGMP Snooping and IGMP Snooping Querier Configuration Guidelines and Restrictions, page 21-6
• Enabling the IGMP Snooping Querier, page 21-7
• Configuring IGMP Snooping, page 21-8
Note • To support Cisco Group Management Protocol (CGMP) client devices, configure the Multilayer
Switch Feature Card (MSFC) as a CGMP server. Refer to the Cisco IOS IP and IP Routing
Configuration Guide, Release 12.1, “IP Multicast,” “Configuring IP Multicast Routing,” at
this URL:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_c/ipcprt3/1cdmulti.htm
• For more information on IP multicast and IGMP, refer to RFC 1112 and RFC 2236.
Understanding How IGMP Snooping Works
These sections describe IGMP snooping:
• IGMP Snooping Overview, page 21-2
• Joining a Multicast Group, page 21-2
• Leaving a Multicast Group, page 21-4
• Understanding IGMP Version 3 Support, page 21-6
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