Implementation of Switched Ethernet in ns-2

Hello everyone ,

I have to simulate a LAN with Ethernet switches in a multi hop setup. I was wondering if ns-2.33 release had the libraries and required support for switches which do not use the CSMA/CD protocol which is implemented in the legacy Ethernet.
I have come across this question a couple of times on ns user forums ( dated 2004, 2006 ) but were not answered.

My configuration is :
ns2 version : ns-2.33
Operating sys : Ubuntu 8.04 – The Hardy Heron

It would be appreciated if you any one could help me out with this

Regards,

Mayank Sharma