Re: multiple flow id's in CBQ

[Kevin Fall <kfall@ee.lbl.gov>]

>
> From:  Malin Flodin <malin@cdt.luth.se>
> To:    ns-users@mash.CS.Berkeley.EDU
> Subject: multiple flow id's in CBQ
> Date:  Sat, 02 May 1998 00:07:46 +0200
>
> Hi!
> 
> I have a question concerning CBQ.
> How do I during simulation add and delete
> classes while maintaining a default class
> handling all remaining traffic? I.e. how do I
> create a class that maps to all flowids except
> from those corresponding to the other classes?
> 
> As an example,
>   class A - flow id 10-20
>   class B - flow id 35-38
>   class C - all flow id's not covered by A or B
> 
> And later on, is it possible to delete class B and
> have it's traffic become handled by class C?
> 
> Thanks in advance.
> 
> Malin Flodin
> 

Something like this (assuming all the classes have been
inserted into the cbq link)...

	set cl [$cbqlink classifier]
	set slotnum [$cl findslot $classC]
	$cl set default_ $slotnum

Note that the function "findslot" is new, and you will probably
have to grab a "current snapshot" version of the simulator
(or the file classifier.cc at least) in order to get that
functionality.

In order to re-direct traffic from B to the default,
you basically have to do something like this:

	set xslot [$cl del-hash $src $dst $fid]
	$cl clear $xslot

and in order to re-install it, something like:

	set nslot [$cl installNext $classC]
	$cl set-hash auto $src $dst $fid $nslot

I would recommend you look at the web page:

	http://www-nrg.ee.lbl.gov/floyd/end2end-paper.html

which has pointers to simulation scripts that will be rather
close to what you're looking for I think...

- K