WSF_COMM_PROTOCOL_IGMP

routing_protocol WSF_COMM_PROTOCOL_IGMP

protocol <name> WSF_COMM_PROTOCOL_IGMP

   join_multicast_group <address>

   leave_multicast_group <address>

   level_0_multicast

   level_1_multicast

   level_2_multicast

   join_delay <random-time-reference>

   leave_delay <random-time-reference>

end_protocol

Overview

WSF_COMM_PROTOCOL_IGMP is an emulation of basic multicasting capabilities provided in AFSIM. This protocol is not a routing protocol, and will not determine the correct path or the capability to send to any given destination or group, so it must be used with another routing protocol enabled for successful usage (such as the legacy protocol).

The multicast protocol allows comms to join multicast groups designated by an address in the appropriate range (224.0.0.0 to 239.255.255.255). Any subsequent transmission to an address will then be carried appropriately by any other multicast enabled routers to the appropriate destinations, limiting the number of messages spawned in the process.

Note that sending multicast not only requires this protocol available from the sender, but also the recipient, as well as any potential other comms who may route multicast messages. Other non-multicast enabled comms will simply “discard” the message, as they will not be able to resolve the address to an appropriate destination.

Commands

join_multicast_group <address>

Adds this comm to the multicast group specified. Any messages sent to this address will attempt carrying the message to this comm, assuming no routing failures.

leave_multicast_group <address>

Removes this comm from the specified multicast group. Specifically intended to allow removal of indicated multicast group specification from derived comms.

level_0_multicast

Indicates that this multicast protocol instance is of type 0, indicating no actual multicast support.

level_1_multicast

Indicates that this multicast protocol instance is of type 1, indicating that this comm is capable of sending multicast messages, but cannot receive them.

level_2_multicast

Indicates that this multicast protocol instance is of type 2, indicating that this comm has full multicast capabilities, and can both send and receive multicast messages.

This is the default setting for this protocol.

join_delay <random-time-reference>

Specifies the time required to join a multicast group, for more advanced modeling of network characteristics. This may also affect how other protocols who use multicast (such as OSPF) function, due to delayed propogation of multicast group data amongst routers. Future plans of script capabilities in joining and leaving multicast groups will be affected by this value.

Default constant 0 script

leave_delay <random-time-reference>

Specifies the time required to leave a multicast group, for more advanced modeling of network characteristics. This may also affect how other protocols who use multicast (such as OSPF) function, due to delayed propagation of multicast group data amongst routers. Future plans of script capabilities in joining and leaving multicast groups will be affected by this value.