Acl Rule Numbering - H3C S5820X Series Configuration Manual

ACL category
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.

ACL rule numbering

What is the ACL rule numbering step
If you do not assign an ID for the rule you are creating, the system automatically assigns it a rule ID. The
rule numbering step sets the increment by which the system automatically numbers rules. For example, the
default ACL rule numbering step is 5. If you do not assign IDs to rules you are creating, they are
numbered 0, 5, 10, 15, and so on. The wider the numbering step, the more rules you can insert between
two rules.
By introducing a gap between rules rather than contiguously numbering rules, you have the flexibility of
inserting rules in an ACL. This feature is important for a config order ACL, where ACL rules are matched
in ascending order of rule ID.
Automatic rule numbering and renumbering
The ID automatically assigned to an ACL rule takes the nearest higher multiple of the numbering step to
the current highest rule ID, starting with 0.
For example, if the numbering step is 5 (the default), and there are five ACL rules numbered 0, 5, 9, 10,
and 12, the newly defined rule will be numbered 15. If the ACL does not contain any rule, the first rule will
be numbered 0.
Sequence of tie breakers
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
3