Configuring a Basic ACL Rule

Procedure

1. Run system-view

   The system view is displayed.

2. Run acl { name basic-acl-name { basic | [ basic ] number basic-acl-number } | [ number ] basic-acl-number } [ match-order { config | auto } ]

   The basic ACL view is displayed.

3. Run rule [ rule-id ] [ name rule-name ] { deny | permit } [ fragment-type { fragment | non-fragment | non-subseq | fragment-subseq | fragment-spe-first } | source { source-ip-address { source-wildcard | 0 | src-netmask } | any } | time-range time-name | [ vpn-instance vpn-instance-name | vpn-instance-any ] ] ^*

   A rule is configured for the basic ACL.

   • Adding new rules to an ACL will not affect the existing rules.

   • When an existing rule is edited and the edited contents conflict with the original contents, the edited contents take effect.

   

   When you configure a basic ACL:

   • If a source IP address is specified by configuring source, the system filters only packets with this specified source IP address.

   • If all source IP addresses are specified by configuring any, the system does not check packets' source IP addresses and considers that all packets have matched the rule and directly takes an action (deny or permit) on the packets.

   • If a validity period is specified by configuring time-range, the time range name specified by time-name must already exist. Otherwise, the rule configuration fails.

4. (Optional) Run rule rule-id description destext

   The description for an ACL rule is configured.

   The description of an ACL rule can contain the functions of the ACL rule. Configuring a description for an ACL rule is recommended to prevent misuse of the rule in the following situations:

   • A large number of ACLs are configured, and their functions are difficult to identify.
   • An ACL is used at a long interval, and its function may be left forgotten.

5. Run commit

   The configuration is committed.