ACLs Filtering Locally Generated Traffic

ACLs filter incoming or transient traffic. They do not filter any traffic that is generated by the local router:

If you want to filter traffic that is generated by the router, it's best to use Control Plane Policing (CoPP) (CoPP).

Links:

https://forum.networklessons.com/t/standard-access-list-example-on-cisco-router/889/70?u=lagapidis

https://forum.networklessons.com/t/standard-access-list-example-on-cisco-router/889/22?u=lagapides