Technical data

RackSwitch G8124 Command Reference
Chapter 4: Configuration Commands
 163BMD00076, January 2009
Quality of Service Configuration
Quality of Service (QoS) commands configure the 802.1p priority value and DiffServ Code
Point value of incoming packets. This allows you to differentiate between various types of traf-
fic, and provide different priority levels.
802.1p Configuration
This feature gives the switch the capability to filter IP packets based on the 802.1p bits in the
packet's VLAN header. The 802.1p bits specify the priority that you should give to the packets
while forwarding them. The packets with a higher (non-zero) priority are given forwarding
preference over packets with numerically lower priority value.
DSCP Configuration
These commands map the DiffServ Code Point (DSCP) value of incoming packets to a Class
of Service queue (COSq).
Table 4-50 802.1p Configuration Commands
Command Syntax and Usage
qos transmit-queue mapping {<priority (0-7)>} {<queue (0-7)>}
Maps the 802.1p priority value to a Class of Service queue (COSq) number. Enter the 802.1p
priority value (0-7), followed by the Class of Service queue (0-7) that handles the matching traffic.
Command mode: Global configuration
show qos transmit-queue
Displays the current 802.1p parameters.
Command mode: All except User EXEC
Table 4-51 DSCP Configuration Commands
Command Syntax and Usage
qos dscp transmit-queue {<DSCP value 0-63>} {<queue number (0-7)>}
Maps the DiffServ Code point value to a Class of Service queue number. Enter the DSCP value,
followed by the corresponding COS queue number.
Command mode: Global configuration
[no] qos dscp enable
Globally turns DSCP mapping on or off.
Command mode: Global configuration
show qos dscp
Displays the current DSCP parameters.
Command mode: All except User EXEC