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Multimedia Traffic Control with IP Multicast (IGMP)

IGMP General Operation and Features

Note IGMP configuration on the switches covered in this guide 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,

ProCurve 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 2-12.

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ProCurve 2900 Betriebsanweisung Seite 28