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QoSBeginner

Unanswered Question
Jun 5th, 2012
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Hello, Im a QoS begginer and id like to know about a recommendation from the experts.


I have to configure QoS for VoIP in a Switch Cisco 4507, this switch is the network´s CORE.


Please tell me what is the best and easy way to configure QoS in Cisco 4507, maybe you could suggest some doc to read.. but please i need an easy one in order to understand..


Thanks a lot for your answer.


Atte. Melissa

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melissaguerrero Tue, 06/05/2012 - 12:26
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Hello, thanks for your answer, im trying to priorotize the voice packets just inside LAN.


any other suggestion??


thanks again.

siddhartham Tue, 06/05/2012 - 12:48
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You can also use AutoQos if you don't want to manullay configure on all your LAN switches


http://www.cisco.com/en/US/technologies/tk543/tk879/technologies_white_paper0900aecd800a8561_ps6613_Products_White_Paper.html


You just need the below commands to configure autoqos (IP CEF needs to enabled on the switch)


under the interface that the phones are connected to


auto qos trust voip


Your phones should mark the voice packets with DSCP 46 (EF) and Voice signaling with DSCP 26 ( Cisco recommended values)

melissaguerrero Tue, 06/05/2012 - 12:57
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Could you confirm if this option works with non Cisco ip phones?


we have siemens ip phones


thanks again.

siddhartham Tue, 06/05/2012 - 13:40
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Yes we use it with Avaya. Can your phones mark the packets ?

melissaguerrero Tue, 06/05/2012 - 13:47
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Yes, the phones mark the packets


Please confirm if switches core and edge must have qos configured or only one of them?

Vivek Ganapathi Tue, 06/05/2012 - 19:03
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It is always suggested to mark the traffic as close to the source as possible. I believe your IP phones are connected to the edge switches. Though your phones mark the packets & send to the edge switch, the edge switch would wack off the marking & reset it to the DSCP 0.


You need to configure your edge switches for QoS & trust the markings you would be receiving from your IP Phones. Preserve the markings on the trunk uplinks to the CORE.


I am not sure if your phones are capable of marking (siemens), but it does then it's good as you just need to trust the markings. If not, then you can manually set the CoS value on the interfaces.


Hope this helps.

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