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Multimedia Traffic Control with IP Multicast (IGMP)

IGMP Operating Features

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.

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

12-6

ip igmp

12-7

high-priority-forward

12-8

auto <[ethernet] <port-list>

12-8

blocked <[ethernet] <port-list>

12-8

forward <[ethernet] <port-list>

12-8

querier

12-9

show ip igmp

See “Internet Group Mulitcast Protocol (IGMP)

 

Status” on page B-18

 

 

12-5