Multicast and Routing Guide K/KA/KB.15.15

Contents
1 Multimedia Traffic Control with IP Multicast (IGMP).......................................15
Overview..............................................................................................................................15
Enabling IGMP......................................................................................................................15
Configuring and displaying IGMP (CLI).....................................................................................15
Viewing IGMP configuration for VLANs................................................................................15
Viewing the current IGMP configuration................................................................................15
Viewing IGMP high level statistics for all VLANs on the switch..................................................17
Viewing IGMP historical counters for a VLAN........................................................................17
Viewing IGMP group address information.............................................................................17
Viewing IGMP group information for a VLAN with a filtered address........................................18
Enabling or disabling IGMP on a VLAN...............................................................................18
Configuring per-port IGMP traffic filters.................................................................................19
Configuring the querier function...........................................................................................19
Configuring the querier interval............................................................................................20
Configuring static multicast groups.......................................................................................20
Configuring fast-leave IGMP.....................................................................................................20
Configuring forced fast-leave IGMP...........................................................................................20
Configuring fast learn.........................................................................................................21
Configuring delayed group flush..........................................................................................21
Preventing unjoined multicast traffic......................................................................................21
Configuring IGMP proxy (CLI)..................................................................................................22
Adding or leaving a multicast domain..................................................................................22
Informs the VLAN which IGMP proxy domains to use with joins on the VLAN.............................23
Viewing the IGMP proxy data..............................................................................................23
IGMP general operation and features........................................................................................24
Enhancements...................................................................................................................25
Number of IP multicast addresses allowed.............................................................................25
How IGMP operates...............................................................................................................25
Operation with or without IP addressing................................................................................26
Automatic fast-leave IGMP..................................................................................................27
Default (enabled) IGMP operation solves the "delayed leave" problem......................................28
Forced fast-leave IGMP.......................................................................................................29
Fast learn..........................................................................................................................29
Unjoined multicast traffic.....................................................................................................29
IGMP proxy forwarding......................................................................................................31
How IGMP proxy forwarding works.................................................................................32
Operating notes for IGMP proxy forwarding.....................................................................32
About using the switch as querier..............................................................................................34
Well-known or reserved multicast addresses excluded from IP multicast filtering...............................35
IP multicast filters....................................................................................................................35
Reserved addresses excluded from IP multicast (IGMP) filtering.................................................35
Multicast ARP support.........................................................................................................35
2 PIM-DM (Dense Mode)..............................................................................37
Overview..............................................................................................................................37
Global and PIM configuration contexts......................................................................................37
Enabling or disabling IP multicast routing..............................................................................37
Enabling or disabling PIM at the global level; placing the CLI in the PIM context........................37
Setting the interval in seconds between successive state-refresh messages originated by the routing
switch...............................................................................................................................37
Enabling and disabling PIM SNMP traps..............................................................................37
PIM VLAN (interface) configuration context................................................................................39
Contents 3