Class of Service
123
Instruction Manual - NXA-ENET8-POE+
Perform these steps to map DSCP values to internal PHB/drop precedence:
1.
Click
Traffic
>
Priority
>
DSCP to DSCP
.
2.
Select
Configure
from the Action list.
3.
Select the port to configure.
4.
Set the PHB and drop precedence for any DSCP value.
5.
Click
Apply
.
Perform these steps to show the DSCP to internal PHB/drop precedence map:
1.
Click
Traffic
>
Priority
>
DSCP to DSCP
.
2.
Select
Show
from the Action list.
Mapping CoS Priorities 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.
Command Usage
The default mapping of CoS to PHB values is shown in the Default Mapping of CoS/CFI to Internal PHB/Drop Precedence
table below.
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.
The following table lists the options on this page:
FIG. 136
Configuring DSCP to DSCP Internal Mapping
FIG. 137
Showing DSCP to DSCP Internal Mapping
Traffic - Priority (CoS to DSCP) Options
Port
Specifies a port.
(Range: 1-10/26/28/52)
CoS
CoS value in ingress packets. (Range: 0-7)
CFI
Canonical Format Indicator. Set to this parameter to "0" to indicate that the MAC address
information carried in the frame is in canonical format. (Range: 0-1)
PHB
Per-hop behavior, or the priority used for this router hop. (Range: 0-7)
Drop Precedence
Drop precedence used in controlling traffic congestion. (Range: 0 - Green, 3 - Yellow, 1 - Red)