H3C Technologies H3C S12500 Series Switches - Manual (Page 10)

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Configuring ACL
In this document, EB cards refer to the interface cards suffixed with EB, EC1 cards refer to the interface
cards suffixed with EC1, EC2 cards refer to the interface cards suffixed with EC2, and EF cards refer to
the cards suffixed with EF.
ACL 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. Unless otherwise stated,
ACLs refer to both IPv4 and IPv6 ACLs throughout this document.
ACLs are primarily used for packet filtering. "
Configuring packet filtering with ACLs " provides an
example. You can use ACLs in QoS, firewall, routing, and other feature modules for identifying traffic.
The packet drop or forwarding decisions varies with the modules that use ACLs.
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, protocols over IPv4, and other
Layer 3 and Layer 4 header fields
IPv6
Source IPv6 address, destination IPv6 address,
packet priority, protocols over IPv6, and other
Layer 3 and Layer 4 header fields
Ethernet frame
header ACLs
4000 to 4999 N/A
Layer 2 header fields, such as source and
destination MAC addresses, 802.1p priority,
and link layer protocol type
User-defined
ACLs
5000 to 5999 IPv4 and IPv6
User specified matching patterns in protocol
headers
ACL numbering and naming
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 the ease of identification. After creating an ACL
with a name, you cannot rename it or delete its name.
For an Ethernet frame header, or user-defined ACL, the ACL number and name must be globally unique.
For an IPv4 basic or advanced ACLs, its ACL number and name must be unique among all IPv4 ACLs,
and for an IPv6 basic or advanced ACL, among all IPv6 ACLs. You can assign an IPv4 ACL the same
number and name as an IPv6 ACL.