12-6
Multimedia Traffic Control with IP Multicast (IGMP)
CLI: Configuring and Displaying IGMP
■ Querier Capability: The switch performs this function for IGMP on
VLANs having an IP address when there is no other device in the VLAN
acting as querier. See “Querier Operation” on page 12-18.
Notes Whenever IGMP is enabled, the switch generates an Event Log message
indicating whether querier functionality is enabled.
IP multicast traffic groups are identified by IP addresses in the range of
224.0.0.0 to 239.255.255.255. Also, incoming IGMP packets intended for
reserved, or “well-known” multicast addresses automatically flood through all
ports (except the port on which the packets entered the switch). For more on
this topic, see “Excluding Well-Known or Reserved Multicast Addresses from
IP Multicast Filtering” on page 12-19.
For more information, refer to “How IGMP Operates” on page 12-11.
CLI: Configuring and Displaying IGMP
IGMP Commands Used in This Section
show ip igmp configuration page 12-7
ip igmp page 12-8
high-priority-forward page 12-9
auto <[ethernet] <port-list> page 12-9
blocked <[ethernet] <port-list> page 12-9
forward <[ethernet] <port-list> page 12-9
querier page 12-10
show ip igmp See “Internet Group Management Protocol (IGMP)
Status” on page B-19.
!Software.book Page 6 Thursday, October 10, 2002 6:10 PM
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