R3303-HP HSR6800 Routers ACL and QoS Configuration Guide

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• auto—Sorts ACL rules in depth-first order. Depth-first ordering makes sure that any subset of a rule
is always matched before the rule. Table 1 lists the
sequence of tie breakers that depth-first ordering
uses to sort rules for each type of ACL.
Table 1 Sorting ACL rules in depth-first order
ACL cate
g
or
y
Se
q
uence of tie breakers
IPv4 basic ACL
1. VPN instance
2. More 0s in the source IP address wildcard (more 0s means a narrower IP
address range)
3. Rule configured earlier
IPv4 advanced ACL
4. VPN instance
5. Specific protocol number
6. More 0s in the source IP address wildcard mask
7. More 0s in the destination IP address wildcard
8. Narrower TCP/UDP service port number range
9. Rule configured earlier
IPv6 basic ACL
10. VPN instance
11. Longer prefix for the source IP address (a longer prefix means a narrower IP
address range)
12. Rule configured earlier
IPv6 advanced ACL
13. VPN instance
14. Specific protocol number
15. Longer prefix for the source IPv6 address
16. Longer prefix for the destination IPv6 address
17. Narrower TCP/UDP service port number range
18. Rule configured earlier
Ethernet frame header ACL
19. More 1s in the source MAC address mask (more 1s means a smaller MAC
address)
20. More 1s in the destination MAC address mask
21. Rule configured earlier
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.
Rule comments and rule range remarks
Add a comment about an ACL rule to make it easy to understand. The rule comment appears below the
rule statement.
In addition, add a rule range remark to indicate the start or end of a range of rules created for the same
purpose.
Rule numbering
ACL rules can be manually numbered or automatically numbered. This section describes how automatic
ACL rule numbering works.