13-1
13 ACL Overview
In order to filter traffic, network devices use sets of rules, called access control lists (ACLs), to identify
and handle packets.
When configuring ACLs, go to these chapters for information you are interested in:
z ACL Overview
z IPv4 ACL Configuration
z IPv6 ACL Configuration
z ACL Application for Packet Filtering
Unless otherwise stated, ACLs refer to both IPv4 ACLs and IPv6 ACLs throughout this document.
Introduction to ACL
Introduction
As network scale and network traffic are increasingly growing, network security and bandwidth
allocation become more and more critical to network management. Packet filtering can be used to
efficiently prevent illegal users from accessing networks and to control network traffic and save
network resources. Access control lists (ACL) are often used to filter packets with configured matching
rules.
ACLs are sets of rules (or sets of permit or deny statements) that decide what packets can pass and
what should be rejected based on matching criteria such as source MAC address, destination MAC
address, source IP address, destination IP address, and port number.
Application of ACLs on the Switch
The switch supports two ACL application modes:
z Hardware-based application: An ACL is assigned to a piece of hardware. For example, an ACL
can be referenced by QoS for traffic classification. Note that when an ACL is referenced to
implement QoS, the actions defined in the ACL rules, deny or permit, do not take effect; actions to
be taken on packets matching the ACL depend on the traffic behavior definition in QoS. For details
about traffic behavior, refer to the QoS part in this manual.
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