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12-4

Multimedia Traffic Control with IP Multicast (IGMP)

General Operation and Features

Note IGMP configuration on the Switches 2650 and 6108 operates at the VLAN

context level. If you are not using VLANs, then configure IGMP in VLAN 1 (the

default VLAN) context.

IGMP Terms

■ IGMP Device: A switch or router running IGMP traffic control

features.

■ IGMP Host: An end-node device running an IGMP (multipoint, or

multicast communication) application.

■ Querier: A required IGMP device that facilitates the IGMP protocol

and traffic flow on a given LAN. This device tracks which ports are

connected to devices (IGMP clients) that belong to specific multicast

groups, and triggers updates of this information. A querier uses data

received from the queries to determine whether to forward or block

multicast traffic on specific ports. When the switch has an IP address

on a given VLAN, it automatically operates as a Querier for that VLAN

if it does not detect a multicast router or another switch functioning

as a Querier. When enabled (the default state), the switch’s querier

function 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. For more information, see “How

IGMP Operates” on page 12-11.

!Software.book Page 4 Thursday, October 10, 2002 6:10 PM

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