The ns Manual (formerly ns Notes and Documentation)1 - NM Lab at ...
The ns Manual (formerly ns Notes and Documentation)1 - NM Lab at ... The ns Manual (formerly ns Notes and Documentation)1 - NM Lab at ...
sessionFunction_ The algorithm used to generate session messages. Default is SRM/sessionsessionDelay_ The basic interval of session messages. Slight random variation is added to this interval to avoid globalsynchronization of session messages. User may want to adjust this variable according to their specific simulation.Default value is 1.0.C1_, C2_ The parameters which control the request timer. Refer to [8] for detail. The default value is C1_ = C2_ = 2.0.D1_, D2_ The parameters which control the repair timer. Refer to [8] for detail. The default value is D1_ = D2_ = 1.0.requestBackoffLimit_ The maximum number of exponential backoffs. Default value is 5.State Variables are:stats_ An array containing multiple statistics needed by adaptive SRM agent. Including: duplicate requests and repairs incurrent request/repair period, average number of duplicate requests and repairs, request and repair delay in currentrequest/repair period, average request and repair delay.SRM/ADAPTIVE OBJECTS SRM/Adaptive objects are a subclass of the SRM objects that implement the adaptive SRMreliable multicast transport protocol. They inherit all of the SRM object functionalities. State Variables are:(Refer to the SRM paper by Sally et al [Fall, K., Floyd, S., and Henderson, T., Ns Simulator Tests for Reno FullTCP. URLftp://ftp.ee.lbl.gov/papers/fulltcp.ps. July 1997.] for more detail.)pdistance_ This variable is used to pass the distance estimate provided by the remote agent in a request or repair message.D1_, D2_ The same as that in SRM agents, except that they are initialized to log10(group size) when generating the firstrepair.MinC1_, MaxC1_, MinC2_, MaxC2_ The minimum/maximum values of C1_ and C2_. Default initial values are definedin [8]. These values define the dynamic range of C1_ and C2_.MinD1_, MaxD1_, MinD2_, MaxD2_ The minimum/maximum values of D1_ and D2_. Default initial values are definedin [8]. These values define the dynamic range of D1_ and D2_.AveDups Higher bound for average duplicates.AveDelay Higher bound for average delay.eps AveDups -dups determines the lower bound of the number of duplicates, when we should adjust parameters to decreasedelay.36.9 Commands at a glanceThe following is a list of commands to create/manipulate srm agents in simulations:set srm0 [new Agent/SRM]This creates an instance of the SRM agent. In addition to the base class, two extensions of the srm agent have beenimplemented. They are Agent/SRM/Fixed and Agent/SRM/Adaptive. See section 36.7 for details about these extensions.ns_ attach-agent This attaches the srm agent instance to the given .321
set grp [Node allocaddr]$srm set dst_ $grpThis assigns the srm agent to a multicast group represented by the mcast address .Configuration parameters for srm agent may be set as follows:$srm set fid_ $srm set tg_ .. etcFor all possible parameters and their default values please lookup ns/tcl/mcast/srm.tcl and ns/tcl/mcast/srm-adaptive.tcl.set exp [new Application/Traffic/Exponential]$exp attach-agent $srmThis command attaches a traffic generator (an exponential one in this example), to the srm agent.$srm start; $exp startThese commands start the srm agent and traffic generator. Note that the srm agent and traffic generator have to be startedseparately. Alternatively, the traffic generator may be started through the agent as follows:$srm start-source.See ns/tcl/ex/srm.tcl for a simple example of setting up a SRM agent.322
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set grp [Node allocaddr]$srm set dst_ $grpThis assig<strong>ns</strong> the srm agent to a multicast group represented by the mcast address .Configur<strong>at</strong>ion parameters for srm agent may be set as follows:$srm set fid_ $srm set tg_ .. etcFor all possible parameters <strong>and</strong> their default values please lookup <strong>ns</strong>/tcl/mcast/srm.tcl <strong>and</strong> <strong>ns</strong>/tcl/mcast/srm-adaptive.tcl.set exp [new Applic<strong>at</strong>ion/Traffic/Exponential]$exp <strong>at</strong>tach-agent $srmThis comm<strong>and</strong> <strong>at</strong>taches a traffic gener<strong>at</strong>or (an exponential one in this example), to the srm agent.$srm start; $exp start<strong>The</strong>se comm<strong>and</strong>s start the srm agent <strong>and</strong> traffic gener<strong>at</strong>or. Note th<strong>at</strong> the srm agent <strong>and</strong> traffic gener<strong>at</strong>or have to be startedsepar<strong>at</strong>ely. Altern<strong>at</strong>ively, the traffic gener<strong>at</strong>or may be started through the agent as follows:$srm start-source.See <strong>ns</strong>/tcl/ex/srm.tcl for a simple example of setting up a SRM agent.322
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