Configuring The Dscp Trust State On A Port Bordering Another Qos Domain - Cisco WS-C3560-48PS-S Software Configuration Manual

Chapter 28 Configuring QoS

Configuring the DSCP Trust State on a Port Bordering Another QoS Domain

If you are administering two separate QoS domains between which you want to implement QoS features
for IP traffic, you can configure the switch ports bordering the domains to a DSCP-trusted state as shown
in Figure
stage of QoS. If the two domains use different DSCP values, you can configure the
DSCP-to-DSCP-mutation map to translate a set of DSCP values to match the definition in the other
domain.
Figure 28-12 DSCP-Trusted State on a Port Bordering Another QoS Domain
QoS Domain 1
Beginning in privileged EXEC mode, follow these steps to configure the DSCP-trusted state on a port
and modify the DSCP-to-DSCP-mutation map. To ensure a consistent mapping strategy across both QoS
domains, you must perform this procedure on the ports in both domains:
Command
Step 1 configure terminal
Step 2 mls qos map dscp-mutation
dscp-mutation-name in-dscp to out-dscp
Step 3
interface interface-id
Step 4 mls qos trust dscp
78-16156-01
28-12. Then the receiving port accepts the DSCP-trusted value and avoids the classification
IP traffic
Set interface to the DSCP-trusted state.
Configure the DSCP-to-DSCP-mutation map.
Purpose
Enter global configuration mode.
Modify the DSCP-to-DSCP-mutation map.
The default DSCP-to-DSCP-mutation map is a null map, which maps
an incoming DSCP value to the same DSCP value.
•
•
•
The DSCP range is 0 to 63.
Specify the port to be trusted, and enter interface configuration mode.
Valid interfaces include physical ports.
Configure the ingress port as a DSCP-trusted port. By default, the port
is not trusted.
QoS Domain 2
For dscp-mutation-name, enter the mutation map name. You can
create more than one map by specifying a new name.
For in-dscp, enter up to eight DSCP values separated by spaces.
Then enter the to keyword.
For out-dscp, enter a single DSCP value.
Catalyst 3560 Switch Software Configuration Guide
Configuring Standard QoS
28-35