LevelOne GEL-5261, User Manual

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Chapter 9
| Class of Service
Layer 3/4 Priority Settings
Web Interface
To map CoS/CFI values to Queue precedence:
1.
Click Traffic, Priority, CoS to Queue.
2.
Set the Queue for any of the CoS/CFI combinations.
3.
Click Apply.
Figure 127: Configuring CoS to Queue Mapping
Mapping
DSCP Priorities to Per-
hop Behavior
Use the Traffic > Priority > DSCP to Queue page to map DSCP values in incoming
packets to per-hop behavior for 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 for any of the DSCP values 0 - 63.
◆ This map is only used when the priority mapping mode is set to DSCP (see
page 214 ), and the ingress packet type is IPv4. Any attempt to configure the
DSCP-to-Queue map will not be accepted by the switch, unless the trust mode
has been set to DSCP.
◆
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. The mutation map should be applied at the receiving port at
the boundary of a QoS administrative domain.