VACL

VACL is an acronym for VLAN Access Control Lists where VLAN stands for Virtual Local Area Network. Specifically created to filter and move VLAN traffic. May be used like a SPAN port or network tap it is a way to replicate computer network data that is coming and going from a computer or a network of computers. This is useful if you want to monitor that traffic to determine the health of the application(s) running on those computer(s) or health of the network itself.

VACL or VACL Ports can be much more discriminating of the traffic they forward than a standard SPAN port. They may be set to only forward specific types or specific VLANS to the monitoring port. However, they forward all traffic that matches the criteria as they do not have the functionality to select from ingress or egress traffic like SPAN ports.