The musings of an IT Consultant

Oct 31 2010   9:14PM GMT

When using QoS: Router or ASA?

Raj Perumal Raj Perumal Profile: Raj Perumal

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.

-RP

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