I have a network of 7 computers and I have connected 3 (nonnetwork) printers on one compuer which is also a part of this network all priners are shared with network and I can print any where from the network.
I want to make that printer automatically default printer on my network which is on
Like if a laser printer is on it should be default printer on my network or if my hp printer is on then it should be my default printer.
If there is any software of hardware available please let me know
Thanks and regards
Suhail

If there is any software of hardware available please let me know

I'm not familiar with any products of this type and I think developing a product of this type would be a challenge due to these factors:

The "default" printer is set at the computer level by the operating system of each computer and not at the network level. There isn't a mechanism at the network level for setting a default printer.
Applications prepare a print job using information provided by a specific print driver that is selected when the print job is initiated. Any device or intermediary mechanism in the network that could reroute print jobs to only online printers would have to also translate the job prepared for the printer the user selected to be usable by the printer that actually received the job.

More information about the issue you are trying to address may yield a different approach.