switch in ns3

[salma subh]

Hi all :) 

How i can create a switch in ns3 ? 

i want to create topology like this :

    node    AP...............switch......server

[Tommaso Pecorella]

Hi,

it depends on what you mean by "switch". I'll assume you're talking about IEEE 802.3, a.k.a. Ethernet.

Ethernet... not that fast, not so obvious. There are a LOT of Ethernet standards. See http://en.wikipedia.org/wiki/IEEE_802.3

Now, in ns-3 the coma module implements a very basic 802.3, as is the bus topology one. It's half duplex and a lot of devices can be connected to it.

It's functionally similar to a star topology with an hub.

In order to have a switch (which is far more complex), one should have:

1) a modified CSMA module (either half duplex or full duplex), and

2) a switch module, able to:

  a) port / MAC address learning

  b) internal frame buffering

  c) memory management

Point 1 is easy to do. Point 2 is a bit more difficult.

As a consequence, I'd say that you can't have a switch in ns-3 out-of-the-box. However you can implement this functionality. With a bit o knowledge of course.

Cheers,

T.

[salma subh]

Thanks Tommaso for your replay :)

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