Comtech EF Data CDM-625A - Manual (Page 263)

CDM-625A Advanced Satellite Modem MN-CDM625A
Ethernet-based Remote Product Management Revision 3
7–33
7.5.4.3.3.2 Configuration | Routing | IGMP
This page permits use of Internet Group Management Protocol (IGMP) with configured multicast
routes.
IGMP, when enabled, responds to IGMP queries for the configured multicast routes on the
transmit side and generates IGMP queries on the receive side. If there are no active IGMP
receivers on the LAN, it will stop forwarding the multicast traffic (received from the satellite) to
the LAN.
Figure 7-16. Configuration | Routing | IGMP page
IGMP Multicast Router
• Version – Use the drop-down list to select IGMPv1, IGMPv2, or IGMPv3.
• Last Member Query Interval – This is the maximum response time inserted into group-
specific queries that are set in response to Leave Group messages, and it is also the amount
of time between group-specific query messages. This value may be tuned to modify the
"leave latency" of the network; a reduced value results in reduced time to detect the loss of
the last member of a group.
Enter a value, in seconds, from 1 to 25 (default = 1 second).
• Query Interval – This is the interval between general queries sent by the modem. By varying
the query interval, a modem administrator may tune the number of IGMP messages on the
subnet; note that larger numbers cause the IGMP queries to be sent less often.
Enter a value, in seconds, from 1 to 18000 (default = 125 seconds)
• Query Response Interval – This is the maximum response time inserted into the periodic
general queries. By varying the Query Response Interval, a modem administrator may tune