Configuring Acls; Overview; Acl Categories; Match Order - HP 830 Series Configuration Manual
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- Installation manual (58 pages)
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Configuring ACLs
Unless otherwise stated, ACLs refer to both IPv4 and IPv6 ACLs throughout this document.
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 essentially 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 traffic identification,
for example, QoS and IP routing.
ACL categories
Category
Basic ACLs
Advanced ACLs
Ethernet frame
header ACLs
Match order
The rules in an ACL are sorted in a specific order. When a packet matches a rule, the device stops the
match process and performs the action defined in the rule. If an ACL contains overlapping or conflicting
rules, the matching result and action to take depend on the rule order.
The following ACL match orders are available:
•
Config—Sorts ACL rules in ascending order of rule ID. A rule with a lower ID is matched before a
rule with a higher ID.
Auto—Sorts ACL rules in depth-first order. Depth-first ordering makes sure any subset of a rule is
•
always matched before the rule.
uses to sort rules for each type of ACL.
Table 134 Depth-first match for ACLs
ACL category
IPv4 basic ACL
ACL number
IP version
IPv4
2000 to 2999
IPv6
IPv4
3000 to 3999
IPv6
IPv4 and
4000 to 4999
IPv6
Table 134
Sequence of tie breakers
1.
More 0s in the source IP address wildcard (more 0s means a narrower IP
address range).
2.
Smaller rule ID.
Match criteria
Source IPv4 address.
Source IPv6 address.
Source/destination IPv4 address, protocols over
IPv4, and other Layer 3 and Layer 4 header fields.
Source/destination IPv6 address, protocols over
IPv6, and other Layer 3 and Layer 4 header fields.
Layer 2 header fields, such as source and destination
MAC addresses, 802.1p priority, and link layer
protocol type.
lists the sequence of tie breakers that depth-first ordering
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