I don't have a lot of experience with these setups; however Matt does and used 
GNS3 for his preparation, so he may be able to help you more.

If you are using real switches then you should only need one NIC per router 
interface (Ethernet that is). 

R1 = 2 
R2 = 2
R4 = 2
R5 = 2
R6 = 2
R7 = 2
R8 = 2
R9 = 2
B1 = 1
B2 = 1
B3 = 1
-------
   = 19

The best way to do this would be to purchase a bunch of multiport NIC's along 
with some USB NIC's too. 

Don't forget to follow Tyson's blog on setting this up as well

http://blog.ipexpert.com/2010/07/05/gns3-on-ubuntu-910-the-ipexpert-way/ 

HTH


Thank you,
 
Steve Di Bias
Network Engineer - Information Systems
Valley Health System - Las Vegas
Office - 702- 369-7594
Cell - 702-241-1801
[email protected] 

-----Original Message-----
From: [email protected] 
[mailto:[email protected]] On Behalf Of [email protected]
Sent: Tuesday, June 14, 2011 11:06 AM
To: [email protected]
Subject: [OSL | CCIE_RS] lab with gns3

I just got the end to end R$S

Looking to set my lab up this week. I have 2 3550 and 2 3560 with gns3  
using ubuntu Laptop

I think I am going to use usb nic how many do I need for the lab. Monoprice  
brand

I thought I was going to use a breakout switch however I don't have 3750  
and I here there are some bugs with that setup"

Let me know your experience and suggestions

thanks
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