Chapter 1 About this guide........................................................................... 18
Applicable products..................................................................................................................................18
Switch prompts used in this guide........................................................................................................... 18
Chapter 2 Multimedia traffic control with IP multicast (IGMP)...................19
Overview of IGMP....................................................................................................................................19
Enabling IGMP.........................................................................................................................................19
Configuring and displaying IGMP (CLI)................................................................................................... 19
show ip igmp vlan .........................................................................................................................19
Viewing the current IGMP configuration........................................................................................20
show ip igmp statistics.................................................................................................................. 21
show ip igmp vlan vid.................................................................................................................... 21
show ip igmp groups..................................................................................................................... 22
show ip igmp vlan group............................................................................................................... 22
ip igmp...........................................................................................................................................23
vlan ip igmp................................................................................................................................... 23
vlan ip igmp querier.......................................................................................................................24
ip igmp querier interval..................................................................................................................24
ip igmp static-group.......................................................................................................................25
ip igmp fastleave...................................................................................................................................... 25
ip igmp forcedfastleave............................................................................................................................ 25
igmp fastlearn ...............................................................................................................................26
show igmp delayed-flush...............................................................................................................26
Preventing unjoined multicast traffic..............................................................................................26
Configuring IGMP proxy (CLI)..................................................................................................................26
Adding or leaving a multicast domain........................................................................................... 27
Informs the VLAN which IGMP proxy domains to use with joins on the VLAN............................. 28
Viewing the IGMP proxy data........................................................................................................28
IGMP general operation and features......................................................................................................29
Options..........................................................................................................................................29
Number of IP multicast addresses allowed................................................................................... 30
How IGMP operates.................................................................................................................................30
Operation with or without IP addressing....................................................................................... 31
Automatic fast-leave IGMP........................................................................................................... 32
Default (enabled) IGMP operation solves the "delayed leave" problem....................................... 33
Forced fast-leave IGMP................................................................................................................ 33
Fast learn...................................................................................................................................... 34
Unjoined multicast traffic............................................................................................................... 34
IGMP proxy forwarding................................................................................................................. 36
How IGMP proxy forwarding works.................................................................................... 37
Operating notes for IGMP proxy forwarding.......................................................................38
About using the switch as querier............................................................................................................ 39
Well-known or reserved multicast addresses excluded from IP multicast filtering...................................40
IP multicast filters.....................................................................................................................................40
Reserved addresses excluded from IP multicast (IGMP) filtering.................................................41
Multicast ARP support...................................................................................................................41
IGMPv3.................................................................................................................................................... 41
IGMPv3 commands.......................................................................................................................42
igmp lookup-mode..............................................................................................................42
Contents
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