QoS markings

[burleyman]

I need to set the QoS markings for IP Surveillance cameras because we cannot set the markings on the cameras being used. What I would like to know is it best to set the markings with CoS values, DSCP values or IP Precedence values?

So for the camera policy map which would be best?

policy-map pm_IP-CAMERA
  class cm_IP-CAMERA
   set cos 5

or

policy-map pm_IP-CAMERA
class cm_IP-CAMERA
set dscp 40

or

policy-map pm_IP-CAMERA
class cm_IP-CAMERA
set dscp cs5

or

policy-map pm_IP-CAMERA
class cm_IP-CAMERA
set ip-precedence 5

Thanks,

Mike

[Jonathan Schulenberg]

DSCP is a superset of IP Precedence so that distinction is easy. CoS is a header of the 802.1q encapsulation so it's only relevant on trunk ports. The most common approach these days would be "set dscp". As for the marking value: that depends on your larger QoS design.

[burleyman]

Thanks for the reply. That was the way I ended up going.

policy-map pm_IP-CAMERA
class cm_IP-CAMERA
set dscp cs5

Thanks

[Dennis Mink]

It also depends on how this traffic is going to flow, 

If your IP camera video traffic is going to cross a WAN than you might want to talk to your provider to see if the support IP precedence or DSCP or both.

If that doesnt apply and the traffic remains local, DSCP is the go