Configuration | Routing | Igmp - Comtech EF Data CDM-625A Installation And Operation Manual

Advanced satellite modem (18 kbps – 25 mbps)

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CDM-625A Advanced Satellite Modem

Ethernet-based Remote Product Management

7.5.4.3.3.2 Configuration | Routing | IGMP

This page permits use of Internet Group Management Protocol (IGMP) with configured multicast

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

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)

Figure 7-16. Configuration | Routing | IGMP page

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