One or more access control entries (ACEs) make up an access control list (ACL), which together form the network traffic profile. Cisco IOS XR Software software features like traffic filtering, priority or custom queueing, and dynamic access control can then refer to this profile.
Only the source IP address of a packet can be evaluated using standard access control lists (ACLs). Standard access lists aren't as powerful as extended access lists, and they can't distinguish between different forms of IP traffic, but they use less CPU. Multiple statements can be included in an ACL.
Named or Numbered Access Lists, A name or a number must be assigned to each access list. Because you can select a meaningful name that is simpler to recall and associate with a task, named access lists are more handy than numbered access lists.
There are also changes in configuration between numbered and named ACLs. The most significant distinction is that the global command used by named ACLs puts the user in a named IP access list sub mode, where matching and actions permit or deny logic can be specified.
To configure an extended named ACL, enter the ip access-list extended command. The options at the ACL configuration level and the syntax for the ip access-group command are the same for numbered and named ACLs and are described in Extended numbered ACL configuration and Extended numbered ACL configuration.
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