Comtech EF Data VMS v3.12.x Vipersat - Manual (Page 265)

Chapter 4 - Configuring Network Modems 4-47
MN/22156, rev 12 Network
Note: If the IGMP feature (FAST code) has not been purchased for this
modem, the IGMP menu item will not be displayed.
Selecting one of the IGMP (Internet Group Management Protocol) Version
radio buttons (V1, V2, V3) in the IGMP dialog shown in figure 4-30 enables the
receive portion of a modem unit to use the modem as an IGMP server. The
transmit portion of the terminal utilizes the modem as an IGMP client. The
IGMP feature configures the unit to report an interest to join a Multicast group
on an IGMP server. IGMP is used to regulate multicast traffic on a LAN
segment to prevent information of no interest from consuming bandwidth on the
LAN.
Figure 4-30 Internet Group Management dialog, CDM-840
Last Member Query Interval
This parameter is the maximum response time (delay), in seconds, that is
allowed for a multicast client to answer on a group-specific query.
Query Interval
The IGMP protocol requests that a server periodically publish to users on the
LAN the multicast IP Addresses that it can service. The IGMP Query Interval
NOTE