How to run juniper Router on GNS3 1.1 using VirtualBox:
This article is about the installation and configuration of juniper router on gns3 1.1. There are some ways for using Juniper router on GNS3, here i will discus one of them i.e. using VM junOS on GNS3.
In this method we used a virtual machine of JunOS Olive (Juniper Image) for gns3 simulation. We need a JunOS Olive image VM (.ova file) which you can download from this link. Once you have download this, you need to create a virtual machine using this .ova file in your virtual box and then you can use that VM in GNS3 for simulating juniper router.
1. Simply double click on this .ova file that you have downloaded from above link or open this file using virtual-box and then click on import. You can change default setting before importing, for example you can change the RAM, VM name, Network adapter etc
Then type the name for new clone or VM and select the checkbox "reinitialize the MAC address of all network cards"
2. Now launch Gns3 and open the Edit\preferences, goto virtualbox setting and create a new VM on gns3 by clicking on New. select the junOS VM from menu that we have created in step-1 and click on finish and then on OK.
For using multiple juniper router you need to create multiple router VM in gns3 using above method. For simulating three juniper router you need three VirtualBox VMs in Gns3.
You can also change it PC symbol to router from change symbol.