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Configuring acls, Overview, Applications on the switch – H3C Technologies H3C S6300 Series Switches User Manual

Page 11: Acl categories, Numbering and naming acls

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Configuring ACLs

Overview

An access control list (ACL) is a set of rules (or permit or deny statements) for identifying traffic based on

criteria such as source IP address, destination IP address, and port number.
ACLs are primarily used for packet filtering. "

Configuring packet filtering with ACLs

" provides an

example. You can use ACLs in QoS, security, routing, and other feature modules for identifying traffic.

The packet drop or forwarding decisions varies with the modules that use ACLs.

Applications on the switch

An ACL is implemented in hardware or software, depending on the module that uses it. If the module is

implemented in hardware (for example, the packet filter or QoS module), the ACL is applied to hardware

to process traffic. If the module is implemented in software (for example, the routing module or the user
interface access control module such as Telnet, or SNMP), the ACL is applied to software to process

traffic.
The user interface access control module denies packets that do not match any ACL. Some modules (QoS

for example) ignore the permit or deny action in ACL rules and do not base their drop or forwarding
decisions on the action set in ACL rules. See the specified module for information about ACL application.

ACL categories

Category

ACL number

IP version

Match criteria

Basic ACLs

2000 to 2999

IPv4

Source IPv4 address.

IPv6

Source IPv6 address.

Advanced ACLs 3000 to 3999

IPv4

Source IPv4 address, destination IPv4 address,
packet priority, protocol number, and other

Layer 3 and Layer 4 header fields.

IPv6

Source IPv6 address, destination IPv6 address,
packet priority, protocol number, and other
Layer 3 and Layer 4 header fields.

Ethernet frame
header ACLs

4000 to 4999

IPv4 and IPv6

Layer 2 header fields, such as source and

destination MAC addresses, 802.1p priority,
and link layer protocol type.

Numbering and naming ACLs

Each ACL category has a unique range of ACL numbers. When creating an ACL, you must assign it a

number. In addition, you can assign the ACL a name for ease of identification. After creating an ACL with

a name, you cannot rename it or delete its name.