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30.2.4 The internal variablesClass mrtObjectprotocols_mask-wkgroupswkgroupsAn array of handles of protocol instances active at the node at which this protocol operatesindexed by incoming interface.Class variable—defines the mask used to identify well known groups.Class array variable—array of allocated well known groups addresses, indexed by the groupname. wkgroups(Allocd) is a special variable indicating the highest currently allocated wellknown group.McastProtocolstatus_type_SimulatormultiSim_MrtHandle_takes values “up” or “down”, to indicate the status of execution of the protocol instance.contains the type (class name) of protocol executed by this instance, e.g., DM, or ST.1 if multicast simulation is enabled, 0 otherwise.handle to the centralised multicast simulation object.Nodeswitch_multiclassifier_replicator_Agents_outLink_inLink_Link and SimpleLinkiif_head_NetworkInterfaceifacenum_handle for classifier that looks at the high bit of the destination address in each packet to determinewhether it is a multicast packet (bit = 1) or a unicast packet (bit = 0).handle to classifier that performs the 〈s, g, iif〉 match.array indexed by 〈s, g〉 of handles that replicate a multicast packet on to the required links.array indexed by multicast group of the list of agents at the local node that listen to the specificgroup.Cached list of outgoing interfaces at this node.Cached list of incoming interfaces at this node.handle for the NetworkInterface object placed on this link.first object on the link, a no-op connector. However, this object contains the instance variable,link_, that points to the container Link object.Class variable—holds the next available interface number.30.3 Commands at a glanceFollowing is a list of commands used for multicast simulations:set ns [new Simulator -mcast on]This turns the multicast flag on for the the given simulation, at the time of creation of the simulator object.ns_ multicastThis like the command above turns the multicast flag on.ns_ multicast?This returns true if multicast flag has been turned on for the simulation and returns false if multicast is not turned on.271