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QoS when is auto qos no longer enough

venturas05
Level 1
Level 1

I am still new to QoS and my role as Network Admin. We have 4 cores, 16 distribution, and 200+ access layer switches. I have been reading through all the QoS books and looking to configure advanced QoS on my switches. The guy I replaced came by today and told me that he has always been told to stick to auto QoS and leave it be. My question is when is Auto QoS no longer enough? Since taking over I have done some research on our switches and most of them have middle to large buffer misses and failures which I see as a result of poorly configured QoS. He informed me that he was always told to configure QoS only on VoIP ports and only on access layer switches. Is this correct? It doesn't seem so to me. I just want to know before I pure more hours into designing an advanced QoS plan for my network. I have a mixture of switches so I have to develop a plan for around 10 - 12 different flavors of cisco access, distribution, and core layer switches.

Thank you for any advice you can offer.

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