How to call an ACL on an interface of an AR router

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Run the traffic-filter command in the interface view to configure an ACL-based packet filtering function.

Other related questions:
When modify the ACL of NAT configuration on AR router, whether the network will be broken?
AR router access control list ACL and interface address are associated, the NAT must be disabled by using command "undo NAT outbound acl-number" and then the ACL configuration can be can modified, it will lead network be broken.

What is the call prefix of the AR router
A call prefix, an important attribute of the call service, defines a call number rule and describes the call number distribution and routing plans in an exchange office. A call prefix identifies the service attribute (basic service or supplementary service; intra-office call, national long-distance call, or international long-distance call) of a dialing plan and determines the range of dialed number length. Call prefixes can also be used to control call permissions. A PBX checks the validity of a dialed number and connects or rejects the call based on the call prefix. A call can be connected correctly only if the call matches the correct call prefix. Therefore, a correct call prefix configuration is the key to the call service. A call must match at least one call prefix.

What is the call route of the AR router
A call route binds an inter-office call prefix to a trunk group so that calls with the specified call prefix are transmitted on the specified trunk line.

How to classify the interfaces of AR routers
For AR routers: Interfaces of a device are used to exchange data and interwork with other devices and can be classified into physical interfaces and logical interfaces, in which: 1. Physical interfaces are real interfaces supported by components and can be further classified into management interfaces and service interfaces. - Management interfaces: Management interfaces are used to support the configuration and management operations performed by users. Users can use management interfaces to log in to devices and perform configuration and management operations. Management interfaces do not transfer service data. - Service interfaces: Service interfaces are used to transfer service data and can be classified into LAN interfaces and WAN interfaces. LAN interfaces can be used by routers to exchange data with network devices in the LAN. WAN interfaces can be used by routers to exchange data with devices in the external networks which are far away from the routers. 2. Logical interfaces can implement data exchange but do not exist physically and must be established by configurations. Logical interfaces transfer service data.

Is the network disconnected after the ACL in the NAT configuration of the AR router is modified
To modify an ACL that is associated with the IP address of an outbound interface, you must first run the undo nat outbound acl-number command to disassociate the ACL from the IP address, resulting in network interruption.

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