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An Access Control List (ACL) is a group of Access Control Rules. Access Control Rules are used to describe how to forward (route) packets, as opposed to where to forward them. The how can be to forward the packet with a specific priority(0-7), forward the traffic with an un-changed priority, or filter packets (drop).
ACLs provide the mechanism to prioritize traffic flows through the router and the network. This traffic flow management is commonly referred to as Quality of Service (QoS). See Chapter 25:�80-Series QoS for more information on QoS.
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