Re: Route Computation

[Yuri Pryadkin <yuri@who.isi.edu>]

David Lapsley <david@melbourneit.com.au> writes:

> Hi All,
> 
> I am having a lot of trouble trying to work out how
> routes are computed in ns. Specifically, how the
> connection is made between a node's classifier_
> and the appropriate queue (e.g. DropTail). I had thought
> this was done in the "compute-routes" function in
> ~ns-2/tcl/lib/ns-route.tcl, but then I had a look at
> the simulator startup function, "run" and the appropriate
> line was commented out! 
> 
> Any tips or pointers would be greatly appreciated.
> 
> Thanks in advance,
> David.
> 
> PS: here is an the start of Simulator run...
> 
> Simulator instproc run {} {
> 	#$self compute-routes
> 
> 	$self check-node-num
> 	$self rtmodel-configure			;# in case there are any
> 	[$self get-routelogic] configure

The previous line does just what you are looking for (see
tcl/lib/ns-route.tcl)

In the simplest case it calls Agent/rtProto/Static::init-all {}
(tcl/rtglib/route-proto.tcl) 

And only then, the method Simulator::compute-routes is called.

BTW, you can use a tcl debugger to trace the whole sequence.

  -Yuri

> 	$self instvar scheduler_ Node_ link_ started_ 
> 	
> 	set started_ 1
> 	
> 	#
> 	# Reset every node, which resets every agent.
> 	#
> 	foreach nn [array names Node_] {
> 		$Node_($nn) reset
> 
> --
> David Lapsley, Research Engineer
> Melbourne Information Technologies Australia Pty. Ltd.
> 3/207 Bouverie Street, Carlton, Vic. 3053, Australia
> Telephone: +61 3 9344 9386, Facsimile: +61 3 9347 9473