by olivier | Feb 27, 2010 | IOS, Lab, QOS, Written Theory
Here are the default values for the mapping until you decide to change it
First let’s see the CoS-to-DSCP mapping
- CoS 0 => DSCP 0
- CoS 1 => DSCP 8
- CoS 2 => DSCP 16
- CoS 3 => DSCP 24
- CoS 4 => DSCP 32
- CoS 5 => DSCP 40
- CoS 6 => DSCP 48
- CoS 7 => DSCP 56
After let see the reverse side with the DSCP-to-CoS mapping
- DSCP 0 => CoS 0
- DSCP 8,10 => CoS 1
- DSCP 16,18 => CoS 2
- DSCP 24,26 => CoS 3
- DSCP 32,34 => CoS 4
- DSCP 40,46 => CoS 5
- DSCP 48 => CoS 6
- DSCP 56 => CoS 7
by olivier | Feb 27, 2010 | IOS, Lab, QOS, Written Theory
Here are the default CoS assignement for the queue unless you modify the standard
- CoS value 0,1 => Queue 1
- CoS value 2,3 => Queue 2
- CoS value 4,5 => Queue 3
- CoS value 6,7 => Queue 4
by olivier | Feb 27, 2010 | IOS, Lab, QOS, Written Theory
Just as a reminder , CoS marking (Layer 2) doesn’t “survive” to Layer 3 as the route processor will remark it.
It is why the most of the time a Cos to DSCP rewriting policy must be applied on the input direction of the interface.
