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QOS guidlines

I want to implement QOS for VOIP traffic between Branch Office IP phones and Headoffice PABX.

Basic network diagram is as follows

Nortel IP PHONES (Branch Office)

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L2 ordinary Switch

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Cisco 1841

|

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-----MPLS WAN-----

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|

Cisco 1841

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Cisco ASA

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Cisco 3560 (with multiple VLANs)

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NORTEL PABX (Headoffice)

Regards,

Muhammad

1 REPLY

Re: QOS guidlines

Muhammad,

You might run into some limitations depending on the switch the Branch site is connected to. As far as the rest of the setup, you can apply QoS for the remainder of the network which will cover most of your environment. High level you will want input policies configured on your Branch 1841 and the HQ 3560 (assuming 3560 is L3 image). On these input policies you will classify the Voice Signaling and Voice RTP to a DSCP value, 46 for voice and 24 for signaling. From there output queueing can be configured on the 3560, ASA and 1841 WAN interfaces. That is the high level basics. The documents you want to work with are the QoS SRND and the ASA configuration guide (since ASA isnt covered in the SRND). Here are the documents.

http://www.cisco.com/application/pdf/en/us/guest/netsol/ns432/c649/ccmigration_09186a008049b062.pdf

http://www.cisco.com/en/US/products/ps6120/products_configuration_guide_chapter09186a008054ed1f.html

Understand the QoS SRND is from a Cisco standpoint but does cover industry VoIP protocols such as H323 and SIP.

Please rate any helpful posts

Thanks

Fred

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