2
Multimedia Traffic Control with IP
Multicast (IGMP)
Contents
Overview
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
IGMP General Operation and Features
. . . . . . . . . . . . . . . . . . . . . . . . . 2-3
IGMP Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
IGMP Operating Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Basic Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Enhancements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Number of IP Multicast Addresses Allowed . . . . . . . . . . . . . . . . . . 2-6
Number of Multicast Filters Allowed . . . . . . . . . . . . . . . . . . . . . . . 2-6
CLI: Configuring and Displaying IGMP
. . . . . . . . . . . . . . . . . . . . . . . . . 2-7
How IGMP Operates
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Operation With or Without IP Addressing . . . . . . . . . . . . . . . . . . . . . . 2-13
Automatic Fast-Leave IGMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
Forced Fast-Leave IGMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
Configuring Delayed Group Flush . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
IGMP Proxy Forwarding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
How IGMP Proxy Forwarding Works . . . . . . . . . . . . . . . . . . . . . . 2-19
CLI Commands for IGMP Proxy Configuration . . . . . . . . . . . . . . 2-21
VLAN Context Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22
IGMP Proxy Show Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
Operating Notes for IGMP Proxy Forwarding . . . . . . . . . . . . . . . 2-24
Using the Switch as Querier
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26
Excluding Well-Known or Reserved
Multicast Addresses from IP Multicast Filtering
. . . . . . . . . . . . . . . 2-27
2-1
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