Reference Guide

484 Quality of Service
The following is an example of the CLI commands:
DSCP Rewrite
Use the DSCP Rewrite page to rewrite the DSCP tags for incoming traffic,
when different DSCP values are used in the incoming and outgoing domains.
Changing the DSCP value used in one domain to the DSCP value used in the
other domain preserves the priority of traffic used in the first domain.
As an example, assume that there are three levels of service: Silver, Gold, and
Platinum. The DSCP incoming values used to mark these levels are 10, 20,
and 30 respectively. If this traffic is forwarded to another service provider that
has the same three levels of service, but uses DSCP values 16, 24, and 48, the
values set in the DSCP Rewrite page are used to change the incoming values
to the outgoing values.
These settings are active globally when the system is in QoS Basic mode.
To map DSCP In values to DSCP Out values:
1
Click Quality of Service > QoS Basic Mode > DSCP Rewrite in the tree
view to display the
DSCP Rewrite page.
2 For each DSCP In value (DSCP value of the incoming packet) that needs
to be rewritten to an alternative value, set a
DSCP Out value.
qos dscp-mutation
no qos dscp-mutation
Applies the DSCP Mutation map to
system DSCP trusted ports.
Use the no form of this command to
restore the trusted port with no
DSCP mutation.
console(config)# qos trust dscp
console(config)# qos dscp-mutation
Table 22-8. Global Settings CLI Commands (continued)
CLI Command Description