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Multimedia Traffic Control with IP Multicast (IGMP)
IGMP Operating Features
Not e If you configure an individual port as blocked, but that port has either a
forward configured on another VLAN or belongs to another VLAN that is
connected to a router, blocking will not occur.
Querier: In the default state (enabled), eliminates the need for a multicast
router. In most cases, HP recommends that you leave this parameter in
the default “enabled” state even if you have a multicast router performing
the querier function in your multicast group. Refer to
“Querier Operation”
on page 12-20.
IP Addressing: You can configure IGMP on a VLAN regardless of whether
the VLAN has an IP address. The limitation imposed by a lack of an IP
address on a VLAN is that the switch cannot operate as a querier on that
VLAN. Refer to
“IGMP Operates With or Without IP Addressing” on page
12-15.
Fast-Leave IGMP: This automatic feature improves performance by
accelerating blocking on a port where a client has left a multicast group
and the switch does not detect any other end nodes on the port. Refer to
“Fast-Leave IGMP” on page 12-16.
Forced Fast-Leave IGMP: Enables you to configure IGMP to speed up
the process of blocking unnecessary IGMP traffic to a switch port con-
nected to multiple end nodes. Refer to
“Forced Fast-Leave IGMP” on page
12-18.
Not e Whenever IGMP is enabled, the switch generates an Event Log message
indicating whether querier functionality is enabled.
For more information, refer to “More on IGMP Operation” on page 12-10.
CLI: Configuring and Displaying IGMP
IGMP Commands Page
show ip igmp configuration
ip igmp
high-priority-forward
auto <[ethernet] <port-list>
blocked <[ethernet] <port-list>
forward <[ethernet] <port-list>
querier
show ip igmp
12-6
12-7
12-8
12-8
12-8
12-8
12-9
See “Internet Group Mulitcast Protocol (IGMP)
Status” on page
B-18
12-5