The alternatives that you mention include the cluster images, and the images of the actual VIRL devices themselves. It is expected that complex software needs to be tuned to your environment, as there is no way for them to plan in advance a turnkey solution for all environments. It is not easily usable as GNS3, almost useless and very in consistence. So lets install them:. That means you have to be very careful with the permissions. The nice thing about IOSv is, that it automatically formats unformatted disks for use as a flash drive. 
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In this receipt I use mtools to work with dos formatted disk images. This is very useful if you want to run the images directly within the hypervisor iowv as ESXior an alternative system such as Unetlab.
To the comment above about Cisco removing the node license. Luckily, the filesystem on the VIRL host VM is not going to change between simulations, and all of the nodes have a built-in method of communicating with the host. While this solution works, it requires much more down-time between labs.
So lets install them:. However, someone pointed out to me that there was a much easier way to do this: It is expected iosg complex software needs to be tuned to your environment, as there is no way for them to plan in advance a turnkey solution for all environments. VIRL is a pretty complex software package with lots of individual components. After setting the VM to eight cores, I noticed quite a big difference, and my other VMs did not appear to suffer from it.
The kbps is fine for proving something works, but if you want to do load testing, you need to get a proper license. Unetlab is most popular or the latest version of GNS3 would be my choices based on feedback from the industry.
The overall responsiveness and time to boot the nodes is improved, but not as much as I expected. All newly created IOSv router will now start with this config. The cluster images are designed to harness multiple physical computers to allow you to create larger and faster simulations. They were released as part of VIRL not too long ago, and have been making improvements with time.
I then read another tweak about assigning proper affinity to the VM. There is a snapshot system built in to the web interface, but it is not very intuitive at this point in time. So our just created ioxv disk image is iosf DOS formatted and ready to use. I then allocated it properly as two quad-core CPUs matching realityand this was where I saw the biggest performance increase with regards to both boot ipsv and overall responsiveness.
Juniper, Brocade, Arista switches and routers. Now we need to determine, where GNS3 has stored our disk image. I also configured the memory so that it could not overcommit. If you stop the simulation completely, the next time you start it, everything is rebuilt from scratch.
My Experiences With Cisco’s VIRL
However, placing other EXEC-mode commands at the end of the configurations before the end linesuch as do term len 0may save you some extra steps when you start labbing.
Not enough for a lot of the INE labs. What are they for? Iodv, you have the option of extracting the current running configurations when the nodes are stopped, but this does not include anything saved on the virtual flash disks.
How to install
Sounds like setting up a solid VIRL environment is a welcome challenge for anyone coming from the virtualization side and looking to bust their silo in The nice thing about IOSv is, that it automatically formats unformatted disks for use as a flash drive. However, as this post demonstrates, extra tweaks are needed to tune VIRL to your system.
This may be improved quite a bit in newer generation CPUs. This does not need to be done on the IOSv routers, though.
INE Blog | iosv
You will get a popup like this:. Excellent article, really informative. I am using flash cards for labs so I am frequently changing kosv configuration.
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