voice-video traffic classification

[AmitLohumi]

Hi All,

A simple query.

With Cisco ios NBAR, when we say 'match protocol rtp video' , do we also match the audio embedded in the video stream ? .. or does that audio get matched only with the 'match protocol rtp audio' statement ?

Also, is the 'match protocol rtp audio' statement sufficient to match all voice traffic from IP phones on the LAN ?

Regards,

Amit

[sekuzmin]

Hi Amit,

Please read following document http://www.cisco.com/en/US/docs/ios/qos/command/reference/qos_m1.html#wp1038481

As you see, system can differentiate video and video media traffic by payload-type value.

Answering to your questions:

"match protocol rtp audio" - matches RTP traffic with payload-type values in the range of 0 to 23. These payload-type values are reserved for audio traffic.

"match protocol rtp video" - matches RTP traffic with payload-type values in the range of 24 to 33. These payload-type values are reserved for video traffic.

If on your LAN network is used some specific payload-type values, which are not matching with reserved ones, you can use following command and define exact values

"match protocol rtp payload-type " - Specifies matching by a specific payload-type value, providing more granularity than is available with the audio or video keywords.