User manual

C HAPTER 11 | Class of Service
Layer 3/4 Priority Settings
– 133 –
ES-2000 Series
PARAMETERS
These parameters are displayed:
◆ Interface – Specifies a port or trunk.
◆ Trust Mode
■
DSCP – Maps layer 3/4 priorities using Differentiated Services Code
Point values. (This is the default setting.)
■
CoS – Maps layer 3/4 priorities using Class of Service values.
WEB INTERFACE
To configure the trust mode:
1. Click Traffic, Priority, Trust Mode.
2. Select the interface type to display (Port or Trunk).
3. Set the trust mode.
4. Click Apply.
Figure 71: Setting the Trust Mode
MAPPING INGRESS
DSCP VALUES TO
INTERNAL DSCP
V
ALUES
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
◆ Enter per-hop behavior and drop precedence for any of the DSCP
values 0 - 63.