This post will be about my Juniper test lab. To set up this lab I used the tutorial on this site. I am using a Ubuntu system for this with a i7 processor in it, the processor load is always below 30% when firing up 7 virtual Juniper devices. It took me a while to set it up with the right JunOS, some JunOS releases didn’t work properly. The JunOS version I am using in my virtual-lab environment is :

Juniper1:

juniper@Juniper1> show version
Hostname: Juniper1
Model: olive
JUNOS Base OS boot [8.4R4.2]
JUNOS Base OS Software Suite [8.4R4.2]
JUNOS Kernel Software Suite [8.4R4.2]
JUNOS Crypto Software Suite [8.4R4.2]
JUNOS Packet Forwarding Engine Support (M/T Common) [8.4R4.2]
JUNOS Packet Forwarding Engine Support (M20/M40) [8.4R4.2]
JUNOS Online Documentation [8.4R4.2]
JUNOS Routing Software Suite [8.4R4.2]
    

Below the drawing of the lab I built, I took the lab setup from the Juniper JNCIP study guide.

After installing it I used an intelligent script which I found on this site. This script makes it possible to start all routers with one simple command, with this script you can also stop and start 1 router a time.