Numbering And Naming Acls; Match Order - HP FlexFabric 5700 series Configuration Manual

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.
For an IPv4 basic or advanced ACLs, its ACL number and name must be unique in IPv4. For an IPv6 basic
or advanced ACL, its ACL number and name must be unique in IPv6.

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. If you use this method, check the rules and their order carefully.
NOTE:
The match order of user-defined ACLs can only be config.
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 1 Sort ACL rules in depth-first order
ACL category
IPv4 basic ACL
IPv4 advanced ACL
IPv6 basic ACL
IPv6 advanced ACL
Ethernet frame
header ACL
Table 1 lists the sequence of tie breakers that depth-first ordering
Sequence of tie breakers
1. More 0s in the source IPv4 address wildcard (more 0s means a narrower IPv4
address range).
2. Rule configured earlier.
1. Specific protocol number.
2. More 0s in the source IPv4 address wildcard mask.
3. More 0s in the destination IPv4 address wildcard.
4. Narrower TCP/UDP service port number range.
5. Rule configured earlier.
1. Longer prefix for the source IPv6 address (a longer prefix means a narrower
IPv6 address range).
2. Rule configured earlier.
1. Specific protocol number.
2. Longer prefix for the source IPv6 address.
3. Longer prefix for the destination IPv6 address.
4. Narrower TCP/UDP service port number range.
5. Rule configured earlier.
1. More 1s in the source MAC address mask (more 1s means a smaller MAC
address).
2. More 1s in the destination MAC address mask.
3. Rule configured earlier.
2