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Webcast-Catalyst9k
New Member

QoS for Vlans on a Catalayst Switch

How do you set up QoS for a Voice Vlan. I am setting up a data and a voice vlan. At peak times, I want to give priority to traffic on my voice vlan. How do I set this up. Are their sample configs??

2 ACCEPTED SOLUTIONS

Accepted Solutions

Re: QoS for Vlans on a Catalayst Switch

Hello oliver,

which switch/IOS are you using.. the newer models of the hardware supports a feature called auto-qos.. this will automatically give priority to voice traffic, with just a single command.. simple to configure too.. this is ideal for scenarios, where the IP phone connects to the switch, and the PC connects to the IP Phone...

have a look at this URL:

http://cisco.com/en/US/products/ps6613/products_qanda_item0900aecd8020a589.shtml

Hope this helps.. all the best..

Raj

Re: QoS for Vlans on a Catalayst Switch

Hello Oliver,

Yes.. you can use auto-qos for non-cisco IP phones as well... it will work.. you will have to give the command "auto qos voip trust

" for your NEC phone port... if you give "auto qos voip cisco-phone" , only cisco phones can connect to these ports !!!!

Hope this helps.. all the best.. rate replies if found useful...

Regards

Raj

8 REPLIES

Re: QoS for Vlans on a Catalayst Switch

Hello oliver,

which switch/IOS are you using.. the newer models of the hardware supports a feature called auto-qos.. this will automatically give priority to voice traffic, with just a single command.. simple to configure too.. this is ideal for scenarios, where the IP phone connects to the switch, and the PC connects to the IP Phone...

have a look at this URL:

http://cisco.com/en/US/products/ps6613/products_qanda_item0900aecd8020a589.shtml

Hope this helps.. all the best..

Raj

New Member

What commands are we to set

What commands are we to set on uplink/trunk ports for auto QoS?

Bronze

i need use mls qos trust cos

i need use mls qos trust cos to not rewrite the CoS when packet go out via trunk interface

New Member

I used "auto qos trust" on

I used "auto qos trust" on uplinks? Whats the difference?

New Member

Re: QoS for Vlans on a Catalayst Switch

One new Catalayst 6509 in the Core and 4 new 4510R for access. Customer will be using an NEC IP pbx and ip phones. Will auto work with other vendors phone???

Re: QoS for Vlans on a Catalayst Switch

Hello Oliver,

Yes.. you can use auto-qos for non-cisco IP phones as well... it will work.. you will have to give the command "auto qos voip trust

" for your NEC phone port... if you give "auto qos voip cisco-phone" , only cisco phones can connect to these ports !!!!

Hope this helps.. all the best.. rate replies if found useful...

Regards

Raj

New Member

Re: QoS for Vlans on a Catalayst Switch

Okay, one more question. I have a customer that has several locations with Catalayst 3560 switch connected via 10gb MAN and NEC PBX connected via 10/100 ports. They are getting alot of echo when dialing. Will the 3560's support echo cancellation??? and will we have to put some other device in front to support echo cancellation??

Re: QoS for Vlans on a Catalayst Switch

Hello oliver,

3560's will not support echo cancellation... echo cancellation is normally done on voice gateways or on PBX systems... switches can do qos to just put the packets onto the wire with a preference... the packets still are only IP based on switches... it is ur voice gateway or pbx where the analog signals are being transformed.. so it is logical to do it there...

Refer to this link.. might be useful..

http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080149a1f.shtml

Hope this helps.. all the best.

Raj

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