Chapter 9
| Class of Service
Layer 3/4 Priority Settings
– 249 –
Parameters
These parameters are displayed:
◆ Port – Port identifier. (Range: 1-28/52)
â—† Trust Mode
â–
CoS – Maps layer 3/4 priorities using Class of Service values. (This is the
default setting.)
â–
DSCP – Maps layer 3/4 priorities using Differentiated Services Code Point
values.
Web Interface
To configure the trust mode:
1. Click Traffic, Priority, Trust Mode.
2. Set the trust mode for any port.
3. Click Apply.
Figure 140: Setting the Trust Mode
Mapping
Ingress DSCP Values
to Internal DSCP
Values
Use the Traffic > Priority > DSCP to DSCP page to map DSCP values in incoming
packets to per-hop behavior and drop precedence values for internal priority
processing.
The DSCP is six bits wide, allowing coding for up to 64 different forwarding
behaviors. The DSCP replaces the ToS bits, but it retains backward compatibility
with the three precedence bits so that non-DSCP compliant, ToS-enabled devices,
will not conflict with the DSCP mapping. Based on network policies, different kinds
of traffic can be marked for different kinds of forwarding.
Command Usage
â—† Enter per-hop behavior and drop precedence for any of the DSCP values 0 - 63.
â—† This map is only used when the priority mapping mode is set to DSCP (see
page 248), and the ingress packet type is IPv4. Any attempt to configure the
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