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9.1.4 QoS Example
Scenario 1:
Enable QoS function, change the queue out weight of port ethernet 1/1 to
1:1:2:2:4:4:8:8, and set the port in trust QoS mode without changing DSCP value, and
set the default QoS value of the port to 5.
The configuration steps are listed below:
SWITCH# CONFIG
Switch(Config)#mls qos
Switch(Config)#interface ethernet 1/1
Switch(Config-Ethernet1/1)#queue bandwidth1 1 2 2 4 4 8 8
Switch(Config-Ethernet1/1)#mls qos trust cos pass-through dscp
Switch(Config-Ethernet1/1)#mls qos cos 5
Configuration result:
When QoS enabled in Global Mode, the egress queue bandwidth proportion of port
ethernet 1/1 is 1:1:2:2:4:4:8:8. When packets have CoS value coming in through port
ethernet 1/1, it will be map to the queue out according to the CoS value, CoS value 0 to 7
correspond to queue out 1, 2, 3, 4, 5, 6, 7, 8, respectively. If the incoming packet has no
CoS value, it is default to 5 and will be put in queue 6. All passing packets would not have
their DSCP values changed.
Scenario 2:
In port ethernet 1/2, set the bandwidth for packets from segment 192.168.1.0 to 10
Mb/s, with a burst value of 4 MB, all packets exceed this bandwidth setting will be
dropped.
The configuration steps are listed below:
SWITCH#CONFIG
Switch(Config)#access-list 1 permit 192.168.1.0 0.0.0.255
Switch(Config)#mls qos
Switch(Config)#class-map c1
Switch(Config-ClassMap)#match access-group 1
Switch(Config-ClassMap)# exit
Switch(Config)#policy-map p1
