Posted by: Raj Perumal
ASA, Cisco, NBAR, netflow, nsel, QOS, router
Hi folks! So more and more these days we require QoS for our networks. When you have QoS needs and you need to decide on a Cisco router or a Cisco ASA firewall what should you use?
Well both devices support QoS, but I would lean towards using the router. Why? With the router it seems you have much more capabilities for troubleshooting and figuring out what’s going on in a QoS scenario. A router for example supports NBAR and an ASA does not. The netflow logging is also different in an ASA as it’s not quite the same as a router. It uses someting called NSEL.
I think because QoS can be a trial and error process while you try and tweak it to work the best in your environment, it helps to have all the tools at your disposable and using a router seems to meet this goal. An ASA is great, but in my opinion is more security focused and not ideal in a scenario where you need full QoS capability.