Comtech EF Data CDD-562L - Manual (Page 127)

CDD-562L/564 Demodulator with IP Module Revision 2
CDD-56X CLI and Telnet Operation MN/CDD564L.IOM
8–23
8.2.5.1 IGMP Information page
Access 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
demodulator. This page also helps to determine how the Ethernet Interface is configured, either to
receive requests to join IGMP groups or to announce groups for others to join. This page contains
the following unique selections/fields:
Selection Entry Description
IGMP [RO] Shows IGMP status as [Enabled] or [Disabled].
View IGMP Table V Reports the content that clients have subscribed to the demodulator
using the IGMP protocol. This Allows user to determine which
services are being used and the minimum time before a service will
be terminated.
CDM-IP as Server: IGMP query
period
Q 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.
CDM-IP as Server: IGMP max.
response time R Defines the time interval (in seconds) that the demodulator 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 demodulator is
25 seconds.
CDM-IP 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 will no longer forward
data for that IGMP group.
For example, consider a demodulator that has the IGMP query
period set to 60 seconds, and the number of missed responses 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
demodulator for a period of 60*3 = 180 seconds.