VIRL is a complete network simulation platform for testing, training, and learning.
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Riverbed Modeler (discontinued)
Score 6.0 out of 10
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Riverbed Modeler provided a comprehensive development environment to model and analyze communication networks and distributed systems. The application has been sunsetted, and is no longer available.
Cisco VIRL/CML is obviously very well suited if you want to lab practically any Cisco based network platform. It does a fantastic job of supporting almost all feature sets in a production appliance. It may not be the best option if you require a very multi-vendor intensive solution for labbing purposes.
Riverbed Modeler is well suited for wireless, wired, ZigBee, and Cisco networks. All these scenarios are efficiently designed and simulated using Riverbed Modeler, as all the devices are available in its object pallet, so we just need to drag and drop for the best scenario design in the given dimensions. The simulation results are around 95% accurate. However, it is not suited for data security, as data encryption algorithms are not available in Riverbed Modeler.
Better support for multi-vendor labs. Since Cisco VIRLs uses KVM as its hypervisor, not all vendor images will be fully supported in the Cisco VIRL/CML environment. For these particular use cases, it's sometimes better to use GNS3 or EVE-NG.
Since there are several free offerings out there that allow you to emulate network appliances (especially Cisco IOS based devices), I would love to see Cisco offer more cost-effective alternatives to engineers over their current pricing model.
Riverbed Modeler needs to improve the scenarios of LAN MAN WAN, as the available scenarios under all of these follow a simple area structure that's not connected to the ISP when it comes to simulation. This generates dummy traffic.
Riverbed Modeler also needs to work on the selection of result sets so that, as with most designed networks, we can select any result parameter to show. All the parameters are displayed, whether they are relevant or not. It needs to display only relevant result parameters to select.
The back-end TCP/IP model needs more clarity to expose the structure to some changes.
Cisco VIRL is a great network environment emulation tool when it comes to Cisco devices. However, I have run into some issues when trying to integrate other vendors virtual images into the Cisco VIRL/CML environment. For those specific use cases, I have had better luck with other emulation platforms like EVE-NG.
Cisco VIRL/CML provides a similar emulation environment to GNS3 and EVE-NG but I would argue that it's the best when it specifically comes to Cisco network appliances. This is because you will have access to latest Cisco virtual images with the best support in regards to current feature sets. If you run into any issues, you can also get support from Cisco. The same can't be said about free emulation programs like GNS3 or EVE-NG. However, when it comes to multi-vendor labbing, I have found better success with EVE-NG.
The only thing comparable to OPNET is Packet Tracer, which is basic and very limited. Packet Tracer in terms of tool comparison between the two is like OPNET's stone-age relative.
It has allowed me to avoid mistakes when implementing changes on Cisco devices
It has allowed me to better plan new network change implementations
It has allowed me to be more confident in my network designs by providing me with a predictive model where I can gauge the effect that certain changes and new technology features will have on my network
It comes with a costly paid license, but simulating the network before actual deployment saves a lot of costs, in case after deployment we feel performance is not good and we need to change. This would waste a lot of money, but Riverbed saves this money.
Its OPNET GURU academic edition is available free of cost, but with limited functionality, which is good for students in maximum case. This will degrade our sale of Riverbed Modeler.
A one-time investment in Modeler saves a lot of cost regarding networks, topology, designing, and provides a lifetime license with updates.
