Operation Manual

SFX SERIES USER’S GUIDE
Rev 2.2 44
Figure 2- 19 Edit PID Definition Page
IGMP
The Internet Group Management Protocol (IGMP V1 – RFC 1112 and IGMP V2 – RFC 2236) is an Internet Protocol
that provides the means for a computer to report its multicast group membership to adjacent routers, allowing it to
“tune-in” to multicast transmissions destined for that group.
IP Multicasting allows a host receiver to send content to one or more other computers that have identified themselves
as being interested in receiving that content, known as a multicast group. Multicasting can be used for such
applications as broadcasting streaming media, sending course content in distance learning applications, or delivering
financial information to branch offices in enterprise applications.
IGMP operates in networks where the receiver is directly connected to the subnet. The receiver issues IGMP queries
and receives IGMP membership reports directly.
When the IGMP submenu item is selected under Data Delivery, the IGMP page is displayed for a selected Ethernet
network interface. A sample page is shown in Figure 2- 20 for the Net1 (eth0) Ethernet interface.
Aside from the Common Menu Items, the following menu items are available:
Menu Item Description
Show IGMP
<interface>
Selecting this button will always return you back to the IGMP Attributes Page for the selected
Ethernet network interface, as shown in Figure 2- 20.
Edit <interface> Selecting this button will enter the IGMP Edit page, as shown in Figure 2- 21 for the selected
Ethernet network interface.
Restore Defaults
<interface>
Selecting this button will enter the IGMP Edit page, but with factory default values inserted into
the edit fields automatically. You can then edit these values in the same manner used when the
Edit IGMP buttons were pressed. The following default values are inserted:
IGMP Disabled (pass all multicast packets out the network interface)
IGMP version: 2
Robustness Variable = 2.