31 
Configuring traffic filtering 
You can filter in or filter out traffic of a class by associating the class with a traffic filtering action. For 
example, you can filter packets sourced from an IP address according to network status. 
Configuration procedure 
To configure traffic filtering: 
 
1.  Enter system view. 
system-view
  N/A 
2.  Create a traffic class and 
enter traffic class view. 
traffic classifier
 classifier-name 
[ 
operator 
{ 
and
 | 
or
 } ]
 
By default, no traffic class 
exists.  
3.  Configure match criteria. 
if-match 
[
 not 
]
 
match-criteria
 
By default, no match criterion 
is configured.  
4.  Return to system view. 
quit 
N/A 
5.  Create a traffic behavior 
and enter traffic behavior 
view. 
traffic behavior 
behavior-name 
By default, no traffic behavior 
exists.  
6.  Configure the traffic 
filtering action. 
filter 
{ 
deny
 | 
permit
 }
 
By default, no traffic filtering 
action is configured. 
7.  Return to system view. 
quit 
N/A 
8.  Create a QoS policy and 
enter QoS policy view. 
qos policy
 policy-name
 
By default, no QoS policy 
exists.  
9.  Associate the traffic class 
with the traffic behavior in 
the QoS policy. 
classifier
 classifier-name 
behavior 
behavior-name
 
By default, a traffic class is not 
associated with a traffic 
behavior.  
10.  Return to system view. 
quit 
N/A 
11.  Apply the QoS policy to 
an interface. 
Applying the QoS policy to an interface 
By default, no QoS policy is 
applied to an interface.  
12.  (Optional.) Display the 
traffic filtering 
configuration. 
display traffic behavior 
{ 
system-defined
 | 
user-defined
 } 
[ behavior-name ] [ 
slot
 slot-number ]
 
Available in any view. 
 
Configuration example 
Network requirements 
As shown in Figure 7, configure traffic filtering on GigabitEthernet 1/0/1 to deny the incoming packets 
with a source port number other than 21.