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Catalyst switches qos and avaya voip phones

I am totally new to VoIP. But I have several Avaya phones that will be connecting to the 2960 switch and 3750x. They are both layer 2 switches. my core is a layer 3 3750x.

After doing some research on QoS configuration on the Catalyst switches. I am not sure where to go from here.

So my plan is to configure data vlan10 and voice vlan20 for my switch port. As the Avaya phones marked its traffic to cos5 or dscp 46 (I am not sure which one), I will configure mls qos trust dscp on my switch port. But then after that, I see some people use "auto qos voip trust". Some do "auto qos voip cisco-phone". Do I need to use that command on my switch ports where the phones are connected to? What if I don't, will qos still work? What if I just use "auto qos voip"

What's the difference between autoqos with and w/out cisco-phone?

I also have the PCs connected to the phones.

Thank you in advance for your inputs
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leblanc
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leblanc
1 Solution
 
Craig BeckCommented:
Here you go pitachip... this is a great link which should answer your question :-)

https://supportforums.cisco.com/thread/2037725
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