Comtech EF Data CDM-570 - Manual (Page 301)

CDM-570/570L Satellite Modem with Optional IP Module Revision 12
Ethernet IP Module - CLI and Telnet Operation MN/CDM570L.IOM
14–31
14.2.6.1 IGMP Information Page
Activate the IGMP Information page from the Protocol Configuration page. Use this page to
view the IGMP clients that are actively listening to content being provided by the IP Module. It
also allows you to determine how the Ethernet Interface is configured either to receive requests to
join IGMP groups or announce groups for others to join.
Figure 14-20. IGMP Information page
The IGMP Information page contains the following options/fields:
Selection Entry Description
IGMP [RO] Read-only showing IGMP status ([Enabled] or [Disabled]).
View IGMP Table V This table reports the content that clients have subscribed to the IP Module
using the IGMP protocol. This helps determine which services are being
used and the minimum time before a service is terminated.
Modem as Server:
IGMP query period Q 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 period
defines the time interval (in seconds) between each of these queries for
membership.
Modem as Server:
IGMP max. response time R The IGMP max response time defines the time interval (in seconds) that the
IP Module should wait before it assumes that no parties are interested in the
content published via an IGMP query. This option is expressed in seconds,
and the max response time that is accepted by the IP Module is 25 seconds.
Modem as Server:
Number of missed
responses before leaving
IGMP group
M Defines the number of membership queries that go unanswered from LAN
clients before the Ethernet Interface no longer forwards data for that IGMP
group.
For example, for an IP Module that has the IGMP query period set to 60
seconds and the number of missed responses is set to 3: If a client joins an
IGMP group, then the service to that group will not be discontinued until no
clients respond to a query from the IP Module for a period of 60*3 = 180
seconds.