Explains monitoring techniques for IPv4 ACLs, offering methods to observe ACL activity, assess effectiveness, and troubleshoot operations to maintain robust network security.
You can monitor IPv4 ACLs by displaying the ACLs configured on the switch and those applied to interfaces and VLANs .
When you use the ip access-group interface configuration command to apply ACLs to a Layer 2 or 3 interface, you can display the access groups on the interface. You can also display the MAC ACLs applied to a Layer 2 interface. You can use the privileged EXEC commands as described in this table to display this information.
| Command | Purpose |
|---|---|
| show access-lists [ number | name ] |
Displays the contents of one or all current IP and MAC address access lists or a specific access list (numbered or named). |
| show ip access-lists [ number | name ] |
Displays the contents of all current IP access lists or a specific IP access list (numbered or named). |
| show ip interface interface-id |
Displays detailed configuration and status of an interface. If IP is enabled on the interface and ACLs have been applied by using the ip access-group interface configuration command, the access groups are included in the display. |
| show running-config [ interface interface-id ] |
Displays the contents of the configuration file for the switch or the specified interface, including all configured MAC and IP access lists and which access groups are applied to an interface. |