Qos Troubleshooting - Planet Networking & Communication WGSW-50040 Configuration Manual

As shown in the figure, inside the block is a QoS domain, Switch1 classifies different traffics and assigns
different IP precedences. For example, set CoS precedence for packets from segment 192.168.1.0 to 5 on
port ethernet1/1. The port connecting to switch2 is a trunk port. In Switch2, set port ethernet 1/1 that
connecting to swtich1 to trust CoS precedence. Thus inside the QoS domain, packets of different priorities will
go to different queues and get different bandwidth.
The configuration steps are listed below:
QoS configuration in SwitchA:
Switch#config
Switch(config)#access-list 1 permit 192.168.1.0 0.0.0.255
Switch(config)#class-map c1
Switch(Config-ClassMap-c1)#match access-group 1
Switch(Config-ClassMap-c1)#exit
Switch(config)#policy-map p1
Switch(Config-PolicyMap-p1)#class c1
Switch(Config-PolicyMap-p1-Class-c1)# set ip precedence 5
Switch(Config-PolicyMap-p1-Class-c1)#exit
Switch(Config-PolicyMap-p1)#exit
Switch(config)#interface ethernet 1/1
Switch(Config-If-Ethernet1/1)#service-policy input p1
QoS configuration in Switch2:
Switch#config
Switch(config)#mls qos
Switch(config)#interface ethernet 1/1
Switch(Config-If-Ethernet1/1)#mls qos trust cos

13.4 QoS Troubleshooting

 trust cos and EXP can be used with other trust or Policy Map.
 trust dscp can be used with other trust or Policy Map. This configuration takes effect to IPv4 and IPv6
packets.
 trust exp, trust dscp and trust cos may be configured at the same time, the priority is:
EXP>DSCP>COS.
 If the dynamic VLAN (mac vlan/voice vlan/ip subnet vlan/protocol vlan) is configured, then the packet
COS value equals COS value of the dynamic VLAN.
 Policy map can only be bound to ingress direction, egress is not supported yet.
 At present, it is not recommended to use policy map on VLAN or VLAN's port.
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