McDewey

Multicast in a Campus Network: CGMP and IGMP Snooping

Contents Introduction Before You Begin Conventions Prerequisites Components Used Background Information Multicast Address Internet Group Management Protocol IGMPv1 IGMPv2 IGMPv3 Interoperability Between IGMPv1 and IGMPv2 Interoperability Between IGMPv1/IGMPv2 and IGMPv3 IGMP on a Router Practical Example on a Router Cisco Group Management Protocol CGMP Frames and Message Types Learning Router Ports Joining a Group with CGMP Leaving a Group With CGMP CGMP and Source-Only Network Configuring Cisco Routers and Switches to Enable CGMP Practical Example of CGMP Use and Debug Command and Output IGMP Snooping IGMP Snooping Overview Learning the Router Port Joining a Group With IGMP Snooping IGMP / CGMP Interaction Multicast Source-Only Network Limitations Configuration of IGMP Snooping on Cisco Switches Practical Example of IGMP Snooping Related Information Introduction The purpose of Cisco Group Management Protocol (CGMP) and Internet Group Management Protocol (IGMP) snooping is to restrain multicast traffic in a switched network. By default, a LAN switch floods multicast traffic within the broadcast domain, and this can consume a lot of