Re: [ns] How can I get links used bandwith??

[kunchanl <kunchanl@pollux.usc.edu>]

I remember it seems there were some discussion on this
(i.e. calculating the BW on the fly) in the past. You
might want to check the archive to see if anybody
post his code. But in general, I think you need
to use QueueMonitor (or modify it a bit).

Kun-chan Lan

On Fri, 3 Aug 2001, Juha Villanen wrote:

> Hi,
> 
> I'm just wondering that is it somehow possible to trace the used
> bandwith on a link. I'm implementing a routing protocol(QOSPF) that
> needs to know all the time the links available bandwith. So how should I
> do it. When a new packet goes to the link, is it possible to log its
> length and somehow the time, when the next packet will come to the
> link???...Because if I know these parameters, then when a new packet
> arrives to the link, I can calculate the bandwith used. My
> treshold-based route-calculations then are triggered if a certain amount
> change in bandwith occurs. If this kind of logging of bandwith everytime
> when a new packet arrives to the link is possible, then is it too heavy
> solution?? I mean, when there are a lot of packets arriving in a big
> network, is this kind of solution too slow?....I'm not an expert in ns
> so I dont know very well the implementation of links/queues! If there is
> a queue installed, i suppose then this logging of bandwith have to be
> done in a different way, because the packets are not given straight to
> the link, but to the queue-object!??? So do I have to implement my
> "bandwith monitor" to the queue-object or can I implement it for example
> in transport agent??
> 
> I would be very pleased to have some help with this problem, please
> advice,
> 
> Juha Villanen
> Helsinki university of technology
>