[ns] MNS 2.0 and queueing disciplines

[Alfonso Nardo]

Dear NS users and Bo Peng
you are right, te_db is used to take trace of the resource avaiability during
simulation. Trigger update
has some strange behaviour. I had to change in "routing-nochange" the time
to recall the function. According  to the simulation that I'm running, I
get an error since routing-nochange is called at a negative value of $time.


I'm having some problems, too. My work is centred on the rerouing mechanisms.
As a matter of fact I can't use all queueing disciplines. Droptail seems
to be the only one working. CBQ gives error when you tear down and up a
link but the problem doesn't rely on MNS 2.0.
DRR, RED, SFQ and FQ work  fine only with some rerouting mechanism. and
I don't understand why!!! Have you got any idea regarding it?

I look forward to hearing from you soon,

Alfonso Nardo.


>Dear all,
>
>I am doing simulation about routing in MPLS/IP network by MNS2.0. What
> I
>am
>trying to do is to find out the mechanism of control part of routing and
>evaluate the performance. I use the constraint-routing approach and DV
>algorithm. I have got some good results and seen clearly the route is chosen
>by
>the available resource and dynamic re-compute the new route when resource
>changed by release the path.But there is still something I do not understand,
>like the trigger update mechanism and frequence and the relationship between
>the TE_DB(I have read the the MNS code and it seems use this as the resource
>database).
>
>So if someone is also doing the MPLS simulation or interested in this,
>I
>wish we
>can talk about this and try to finger something out together. I think we
>can
>benifit each other by discussing it.
>
>I am looking forward to hear from you soon.
>
>Cheers,
>
>Bo Peng
>


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