Re: [ns] Documentation on CBQLink and CBQ Objects

[Carlos Alberto Kamienski <cak@cin.ufpe.br>]

> Hi Carlos,
> Thanks very much for your prompt reply.
> Yet again, I have two straight forward questions whose answers are dicey in
> my mind just now;
> (1) If I have a link between n0 and n1 with CBQ,
>       n0---------n1
> Where is the CBQ implemented, is it at the output of n0 or at the imput of n1?

At the link between n0 and n1 (that represents the output of n0)

> (2) If cbqlink is not implemented between n0 and n1, can one still implement 
> CBQ in the link?

As CBQ is implemented at the link, there is no another way of implementing
it.

Carlos

> 
> At 14:53 13/11/00 -0300, you wrote:
> >> I want packets from n0 and n1 to be queued in different queues at n2 before
> >> being forwarded to n3. Since NS do not implement CBQ as object of the node,
> >> I have problem in  managing CBQ in n2. The question is, for me to implement
> >> multiple Queue in n2 only, must I install cbqlink in the 3 links? Does NS
> >> allow you to define a procedure that enable you to install multiple queues
> >> in a node?
> >
> >NS implements queues within link objects. So, in order to get the effect
> >of having multiple queues in node n2, you just need to set a CBQ link
> >between nodes n2 and n3.
> >
> >> I have the ./ns test-suite-cbq.tcl. The script confuse me in terms of how
> >> the events are related to the topology or nodes for the simulation.
> >
> >Take a look in the following simple script:
> >http://www.cin.ufpe.br/~cak/ns/cbq_example.tcl
> >
> >> 
> >> I also have problem with implementation of CBQ using TCP as transport
> agent.
> >
> >If use set a CBQ duplex-link you need to configure CBQ queues in both
> >directions, i.e., link n2-n3 and n3-n2. 
> >Since TCP agents have acks flowing in the opposite direction of the flow,
> >you need either to configure a CBQ as a simplex-link or (if you choose
> >to use a duplex-link) to configure CBQ in both directions.
> >
> >Carlos
> >
> >> 
> >> I will appreciate your help on this and thanks so much for your help so
> far.
> >> I will be grateful to anybody that can help on this.
> >> 
> >>  
> >> At 10:05 09/11/00 -0500, John Mehringer wrote:
> >> >Links to ns documentation can be found at the following link.
> >> >
> >> >http://www.isi.edu/nsnam/ns/index.html
> >> >
> >> > - John
> >> >
> >> >Titus Awotula wrote:
> >> >
> >> >> Hi All,
> >> >> I will be grateful if anybody can send me a link or information on the
> >> >> documentation on the use of CBQlink and CBQ Objects in NS.
> >> >> Please it is urgent.
> >> >> Titus Awotula, MSc AMIEE
> >> >> Dept. of Electronic & Electrical Engineering
> >> >> Loughborough University
> >> >> Loughborough.
> >> >> Leicestershire LE11 3TU
> >> >> Tel: Office (01509) 228117
> >> >>      Home   (01509) 558102
> >> >> Fax: (01509) 227014
> >> >
> >> >
> >> >
> >> Titus Awotula, MSc AMIEE
> >> Dept. of Electronic & Electrical Engineering
> >> Loughborough University
> >> Loughborough.
> >> Leicestershire LE11 3TU
> >> Tel: Office (01509) 228117
> >>      Home   (01509) 558102  
> >> Fax: (01509) 227014
> >> 
> >
> >
> >
> Titus Awotula, MSc AMIEE
> Dept. of Electronic & Electrical Engineering
> Loughborough University
> Loughborough.
> Leicestershire LE11 3TU
> Tel: Office (01509) 228117
>      Home   (01509) 558102  
> Fax: (01509) 227014
>