Chapter 21
| Class of Service Commands
Priority Commands (Layer 3 and 4)
– 528 –
qos map dscp-queue
This command maps DSCP values in incoming packets to per-hop behavior for
priority processing. Use the
no
form to restore the default settings.
Syntax
qos map dscp-queue
dscp-queue
from
dscp0 ... dscp7
no qos map dscp-queue
dscp0 ... dscp7
dscp-queue - Per-hop behavior, or the priority used for this router hop.
(Range: 0-7)
dscp - DSCP value in ingress packets. (Range: 0-63)
D
EFAULT
S
ETTING
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
◆
Enter a value for the per-hop behavior, followed by the keyword “from” and
then up to eight DSCP values separated by spaces.
◆
This map is only used when the QoS mapping mode is set to “DSCP” by the qos
map trust-mode command, and the ingress packet type is IPv4.
◆
Two QoS domains can have different DSCP definitions, so the DSCP-to-Queue/
map can be used to modify one set of DSCP values to match the definition of
another domain. This map should be applied at the receiving port at the
boundary of a QoS administrative domain.
Table 110: Default Mapping of DSCP/CFI Values to Queue
ingress-
dscp10
ingress-
dscp1
0123456789
0 0,0 0,1 0,0 0,3 0,0 0,1 0,0 0,3 1,0 1,1
1 1,0 1,3 1,0 1,1 1,0 1,3 2,0 2,1 2,0 2,3
2 2,0 2,1 2,0 2,3 3,0 3,1 3,0 3,3 3.0 3,1
3 3,0 3,3 4,0 4,1 4,0 4,3 4,0 4,1 4.0 4,3
4 5,0 5,1 5,0 5,3 5,0 5,1 6,0 5,3 6,0 6,1
5 6,0 6,3 6,0 6,1 6,0 6,3 7,0 7,1 7.0 7,3
6 7,0 7,1 7,0 7,3
The ingress DSCP is composed of ingress-dscp10 (most significant digit in the left column) and
ingress-dscp1 (least significant digit in the top row (in other words, ingress-dscp = ingress-dscp10
* 10 + ingress-dscp1); and the corresponding dscp is shown at the intersecting cell in the table.
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