dumbbell topology

[madhu-dora]

hi everyone,
                I m currently working on dumbbell topology. I ve created the topology using PointToPointDumbbellHelper class with three leaves. We have to pass a PointToPointHelper for the leaves link and i specified the delay for the channel. But if i want to specify 3 different delays for 3 channel, then how should i do it. Someone please help me?

[John Abraham]

there is  no way to do that currently, if it would be better if you made the topology without the dumbbell helper. The dumbbell helper helps you quickly create topologies, where the right-set of leaves share the same characteristics and the left-set of leaves shares another set of characteristics. Within the right-set of leaves there is no way to set individual characteristics for each leaf, using the dumbbell helpers.

src/netanim/examples/dumbbell-animation.cc

On Fri, Jul 6, 2012 at 1:35 AM, madhu-dora <madh...@gmail.com> wrote:

hi everyone,
                I m currently working on dumbbell topology. I ve created the topology using PointToPointDumbbellHelper class with three leaves. We have to pass a PointToPointHelper for the leaves link and i specified the delay for the channel. But if i want to specify 3 different delays for 3 channel, then how should i do it. Someone please help me?

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[madhu-dora]

Thanks John.

                    Actually I thought of another way. In that I m getting stuck with the usage of Config::Set. That I can't understand how to give The Path to match the attributes. Till the device list I can get it. What about the rest of the path. I thought i can extract each and every node from the left side of dumbbell topology and set the delay attribute for it.

and I gave Config::Set("NodeList/i/DeviceList/0/ns3::PointToPointChannel/Delay", TimeValue(Milliseconds(i*10))); Will this work?

                     

[John Abraham]

i typically don,t use config::set because it never indicates if there was an error.

src/netanim/model/animation-interface.cc (StartAnimation) retrieves the p2p channel. after getting the Ptr to the channel you can use SetAttribute.

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[madhu-dora]

hey,
    I saw that example. But i don't know how to set a Delay attribute to a Channel object. We can do that only if we have PointToPointChannel object. I don'tknow how to retrieve a PointToPointChannel object from a Channel object. Sorry i got stuck with issue so long.

[John Abraham]

#include "ns3/point-to-point-channel.h"

#include "ns3/point-to-point-net-device.h"

Ptr <PointToPointChannel> pChannel  = DynamicCast<PointToPointChannel> (channel);

NS_ASSERT (pChannel);

pChannel->SetAttribute ("Delay", TimeValue (MilliSeconds (20)));

But i still feel, the right way to do it is , by constructing the links one by one, or in some for loop , by using PointToPointHelper.

On Sun, Jul 8, 2012 at 10:43 PM, madhu-dora <madh...@gmail.com> wrote:

hey,
    I saw that example. But i don't know how to set a Delay attribute to a Channel object. We can do that only if we have PointToPointChannel object. I don'tknow how to retrieve a PointToPointChannel object from a Channel object. Sorry i got stuck with issue so long.

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[madhu-dora]

thanx john....... you helped me a lot....:)

[Sameer Shaikh]

Hi madhu
Can u send me documentation report or file of dumbbell topilogy
Bz my project on that topic..
So please send me file..on my email id
samee...@gmail.com
Thanks for fast reply

[Sameer Shaikh]

Hi john
Can u send me right link
Where i can download whole information abt dumbbell topology..
So please send link..
Thanks for fast reply..