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In today’s networking environment, it is important for IT admins to be able to configure and control access to their network using Access Control Lists (ACLs). ACLs allow admins to define which traffic is allowed to pass through a router or switch, as well as which traffic is blocked. A major challenge for admins is to be able to determine which interfaces an ACL is applied to. Fortunately, Cisco makes it easy to determine which interfaces an ACL is applied to using the show access-lists command.
The show access-lists command is a Cisco IOS command that displays the current Access Control Lists (ACLs) applied to an interface. The command will display the contents of the ACL, including all the entries and their associated actions. This command is useful for IT administrators who need to quickly see which interfaces an ACL is applied to.
When using the show access-lists command, it is important to note that the command must be run from an interface that the ACL is applied to. For example, if the ACL is applied to an interface on a router, the show access-lists command must be run from that interface. The same holds true for switches, as the command must be run from the interface on which the ACL is applied.
Once the command has been run, the output will show all the entries in the ACL and the associated action for each entry. Entries that allow traffic through the interface will have an “accept” action and entries that block traffic will have a “deny” action. This allows admins to quickly see which traffic is being allowed or blocked on a given interface.
In addition to displaying the entries in an ACL, the show access-lists command can also be used to display information about the configuration of the interface. This includes the IP address, subnet mask, and any other settings that are applied to the interface. This allows admins to quickly see all the settings applied to an interface and confirm that the ACL is applied correctly.
The show access-lists command is a valuable tool for IT admins who need to quickly determine which interfaces an ACL is applied to and the entries within the ACL. By using the command, admins can quickly determine which traffic is allowed to pass through a router or switch and which traffic is blocked. This helps to ensure that the network is secure and that only traffic that is allowed is able to pass through the network.
