ECS4660-28F_Management Guide-R03

Table Of Contents
C
HAPTER
10
| Class of Service
Layer 3/4 Priority Settings
– 316 –
3. Select a port.
Figure 141: Showing DSCP to DSCP Internal Mapping
MAPPING
COSPRIORITIES
TO INTERNAL
DSCP VALUES
Use the Traffic > Priority > CoS to DSCP page to maps CoS/CFI values in
incoming packets to per-hop behavior and drop precedence values for
priority processing.
CLI REFERENCES
"qos map cos-dscp" on page 1393
COMMAND USAGE
The default mapping of CoS to PHB values is shown in Table 18 on
page 317.
Enter up to eight CoS/CFI paired values, per-hop behavior and drop
precedence.
If a packet arrives with a 802.1Q header but it is not an IP packet, then
the CoS/CFI-to-PHB/Drop Precedence mapping table is used to generate
priority and drop precedence values for internal processing. Note that
priority tags in the original packet are not modified by this command.
The internal DSCP consists of three bits for per-hop behavior (PHB)
which determines the queue to which a packet is sent; and two bits for
drop precedence (namely color) which is used to control traffic
congestion.
PARAMETERS
These parameters are displayed:
Port – Specifies a port.
CoS – CoS value in ingress packets. (Range: 0-7)