06-05-2012 07:09 AM - edited 03-07-2019 07:04 AM
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
06-05-2012 12:22 PM
Below is a document which explains QoS in detail. Are you trying to priorotize the packets just inside your LAN or is it between 2 sites?
http://www.cisco.com/en/US/products/hw/switches/ps5023/products_tech_note09186a0080883f9e.shtml
06-05-2012 12:26 PM
Hello, thanks for your answer, im trying to priorotize the voice packets just inside LAN.
any other suggestion??
thanks again.
06-05-2012 12:48 PM
You can also use AutoQos if you don't want to manullay configure on all your LAN switches
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)
06-05-2012 12:57 PM
Could you confirm if this option works with non Cisco ip phones?
we have siemens ip phones
thanks again.
06-05-2012 01:40 PM
Yes we use it with Avaya. Can your phones mark the packets ?
06-05-2012 01:47 PM
Yes, the phones mark the packets
Please confirm if switches core and edge must have qos configured or only one of them?
06-05-2012 07:03 PM
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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