HP A6600 Configuration Manual page 8

auto—Sorts ACL rules in depth-first order. Depth-first ordering ensures that any subset of a rule is always

matched before the rule.
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
NOTE:
A wildcard mask, also called an "inverse mask," is a 32-bit binary and represented in dotted decimal
notation. In contrast to a network mask, the 0 bits in a wildcard mask represent 'do care' bits, and the 1
bits represent 'don't care' bits. If the 'do care' bits in an IP address are identical to the 'do care' bits in an
IP address criterion, the IP address matches the criterion. All 'don't care' bits are ignored. The 0s and 1s
in a wildcard mask can be noncontiguous. For example, 0.255.0.255 is a valid wildcard mask.
Table 1 lists the sequence of tiebreakers that depth-first ordering uses to sort
Sequence of tie breakers
1. VPN instance
2. More 0s in the source IP address wildcard (more 0s means a narrower IP
address range)
3. Smaller rule ID
1. VPN instance
2. Specific protocol type rather than IP (IP represents any protocol over IP)
3. More 0s in the source IP address wildcard mask
4. More 0s in the destination IP address wildcard
5. Narrower TCP/UDP service port number range
6. Smaller ID
1. Longer prefix for the source IP address (a longer prefix means a narrower
IP address range)
2. Smaller ID
1. Specific protocol type rather than IP (IP represents any protocol over
IPv6)
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. Smaller ID
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. Smaller ID
2