The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
And to add to Marvin's post, there are limits to have many 6800ia you can connect, both in total and as stacks. I forget the number of stacks, but I believe the total 6800ia supported are 21 (for example, 7 stacks of 3). This would provide you 1,008 gig ports.