Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

video and voice qos

If we have voice and video and data in the wan. Do we assign both video and voice into PQ or leave video into CBWFQ with data?

New Member

Re: video and voice qos

well I think that it depends on ur WAN connection speed and what u need to do exaclty. but most commonly only ur voice (and time sensitive data) is placed in the PQ. sure video is time sensitive but it is not as important as voice.

I think you have to refere to a design guide for this. try SRND


Re: video and voice qos

It depends, but usually voice and video will be in the PQ.

The criterion for video conferencing traffic to be placed into a priority queue is a DSCP value of 34, or a PHB value of AF41. However, due to the larger packet sizes of video traffic, these packets should be placed in the priority queue only on WAN links that are faster than 768 Kbps. Link speeds below this value require packet fragmentation, but packets placed in the priority queue are not fragmented, thus smaller voice packets could be queued behind larger video packets. For links speeds of 768 Kbps or lower, video conferencing traffic should be placed in a separate class-based weighted fair queue (CBWFQ).

Please rate helpful posts.