METRODATA LTD
WCM1100 / WCM3100 / WCM-Serial / LHM1000 / LVM2000 User Manual
76-02-082 Rev N
61 of 169
5.2.9 Priority Management
This configuration menu provides the configuration for the WCM QOS support. The
priority management menu is as below:
Metrodata WCM3100 "WCM Node A" Alarms: Major
PRIORITY MANAGEMENT
DSCP->C-Tag Mapping <menu>
Queue Priorities <menu>
VLAN Override <menu>
Scheduling Mode Weighted Round-Robin
First CAPITAL - select item
<escape> - exit menu
5.2.9.1 DSCP->C-Tag Mapping
The WCM allows priority to sourced from the IP DSCP marker. DSCP is a 6 bit control,
and as such has a range of 0 to 63. When DSCP is used to source a tag priority there are
only 3 bits used thus a translation is required.
As there are only four levels of queue supported in the WCM, the DSCP to PCP mapping
only actually sets the top 2 bits of the PCB, with the third (LSB) coming from the port
default setting. This means that the DSCP values may be allocated to four priority levels
The menu is shown below:
Metrodata WCM1100 "" Alarms: Major
PRIORITY TRANS
pcp 6/7 DSCP 48-63
pcp 4/5 DSCP 32-47
pcp 2/3 DSCP 16-31
pcp 0/1 DSCP 0-15
Restore Defaults
First CAPITAL - select item
<escape> - exit menu
