H3C Technologies H3C SR8800 - Manual (Page 10)

1
Configuring ACLs
NOTE:
•
Unless otherwise stated, ACLs refer to both IPv4 and IPv6 ACLs throughout this document.
• In this documentation, SPC cards refer to the cards prefixed with SPC, for example, SPC-GT48L. SPE
cards refer to the cards prefixed with SPE, for example, SPE-1020-E-II.
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.
ACLs are primarily used for packet filtering. A packet filter drops packets that match a deny rule and
permits packets that match a permit rule. ACLs are also used by many modules, for example, QoS and
IP routing, for traffic identification.
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,
protocols over IPv4, and other Layer 3 and Layer
4 header fields
IPv6
Source IPv6 address, destination IPv6 address,
protocols over IPv6, 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
User-defined
ACLs
5000 to 5999 IPv4 and IPv6
User specified matching patterns in protocol (for
example, IP and MPLS) 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 for identification. 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 ACL, its ACL number and name must be unique among all IPv4 ACLs, and