Configuration procedure
# Create advanced ACL 3000, and configure a rule to match packets whose source port number is not 21.
<DeviceA> system-view [DeviceA] acl number 3000 [DeviceA-acl-adv-3000] rule 0 permit tcp source-port neq 21 [DeviceA-acl-adv-3000] quit
# Create a class named classifier_1, and use ACL 3000 as the match criterion in the class.
[DeviceA] traffic classifier classifier_1 [DeviceA-classifier-classifier_1] if-match acl 3000 [DeviceA-classifier-classifier_1] quit
# Create a behavior named behavior_1, and configure the traffic filtering action to drop packets.
[DeviceA] traffic behavior behavior_1 [DeviceA-behavior-behavior_1] filter deny [DeviceA-behavior-behavior_1] quit
# Create a policy named policy, and associate class classifier_1 with behavior behavior_1 in the policy.
[DeviceA] qos policy policy [DeviceA-qospolicy-policy] classifier classifier_1 behavior behavior_1 [DeviceA-qospolicy-policy] quit
# Apply the policy named policy to the incoming traffic of Ethernet 1/1.
[DeviceA] interface ethernet 1/1 [DeviceA-Ethernet1/1] qos apply policy policy inbound