Reference Guide
OS10(config-pmap-c-qos)# set qos-group 3
OS10(config-pmap-c-qos)# set color yellow
Modify packet elds
You can modify the value of CoS or DSCP elds.
1 Create a QoS type class-map to match a trac ow
OS10(config)# class-map cmap-dscp-3
OS10(config-cmap-qos)# match ip dscp 3
2 Modify the policy-map to update the DSCP eld.
OS10(config)# policy-map modify-dscp
OS10(config-pmap-qos)# class cmap-dscp-3
OS10(config-pmap-c-qos)# set qos-group 3
OS10(config-pmap-c-qos)# set dscp 10
Shaping trac
You can congure to shape the rate of egress trac. When you enable rate shaping, the system buers all trac exceeding the specied
rate till buer memory is exhausted. The rate shaping mechanism uses all buers reserved for an interface or queue and then shared buer
memory, till it reaches the congured threshold.
Congure trac shaping
1 Enter the policy-map type as queuing and congure a policy-map name in CONFIGURATION mode.
policy-map type queuing policy-map-name
2 Enter a class name to apply to the shape rate in POLICY-MAP-QUEUEING mode—up to 32 characters.
class class-name
3 (Optional) If you need rate shaping on a specic queue, match the corresponding qos-group in the class-map. If you do not congure
the match qos-group command, rate shaping applies to all queues.
match qos-group queue-number
4 Enter a minimum and maximum shape rate value in POLICY-MAP-QUEUEING-CLASS mode.
shape {min {kbps | mbps | pps}min-value} {max {kbps | mbps | pps}max-value}
• 0 to 40000000—kilobits per second kilobits per second—kbps
• 0 to 40000 — megabits per second—mbps
• 1 to 268000000 — in packets per second (pps)
Bandwidth allocation
You can allocate relative bandwidth to limit large ows and prioritize smaller ows. Allocate the relative amount of bandwidth to nonpriority
queues when priorities queues are consuming maximum link bandwidth.
Each egress queue of an interface can be scheduled as per Weighted Decit Round Robin (WDRR) or by strict-priority (SP), which are
mutually exclusive. If the bandwidth percent command is present, you cannot congure the priority command as it is used to
assign bandwidth to a queue.
1 Create a class-map of type queuing and congure a name for the class-map in CONFIGURATION mode.
class-map type queuing class-map-name
2 Apply the match criteria for the QoS group in CLASS-MAP mode.
qos-group queue-number
3 Return to the CONFIGURATION mode.
exit
4 Create a policy-map of type queuing and congure a policy-map name in CONFIGURATION mode.
policy-map type queuing policy-map-name
570
Quality of service