Hi Karthik,
Did you check below already
System Landscape Directory (SLD)
Registering Third-Party Systems in the System Landscape Directory (SLD)
http://www.sdn.sap.com/irj/scn/index?rid=/library/uuid/10fc1a87-0e19-2f10-08ba-de46d0cfb676
Hope this helps
Thanks
Prakhar