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classify the data stream. Different classes of data streams will be processed with
different policies.
3． Configure a policy map.
After data steam classification, a policy map can be created to associate with the class
map created earlier and enter class mode. Then different policies (such as bandwidth
limit, priority degrading, assigning new DSCP value) can be applied to different data
streams. You can also define a policy set that can be use in a policy map by several
classes.
4． Apply QoS to the ports
Configure the trust mode for ports or bind policies to ports. A policy will only take effect
on a port when it is bound to that port.
5． Configure queue out method and weight
Configure queue out to PQ or WRR, set the proportion of the 8 egress queues
bandwidth and mapping from internal priority to egress queue.
6． Configure QoS mapping
Configure the mapping from CoS to DSCP, DSCP to CoS, DSCP to DSCP mutation,
IP precedence to DSCP, and policed DSCP.
1. Enable QoS
Command Explanation
Global Mode
mls qos
no mls qos
Enable/disable QoS function.
2. Configure class map.
Command Explanation
Global Mode
class-map <class-map-name>
no class-map <class-map-name>
Create a class map and enter class
map mode; the “no class-map
<class-map-name>” command
deletes the specified class map.
match {access-group <acl-index-or-name>
| ip dscp <dscp-list>| ip precedence
<ip-precedence-list>| vlan <vlan-list>}
no match {access-group | ip dscp | ip
precedence | vlan }
Set matching criterion (classify data
stream by ACL, DSCP, VLAN or
priority, etc) for the class map; the “no
match {access-group | ip dscp | ip
precedence | vlan }” command
deletes specified matching criterion.
3. Configure a policy map.
Command Explanation