H3C S5120-EI series Configuration Manual

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H3C S5120-EI series Configuration Manual Manual pdf 12 page image

2basic or advanced ACL, its ACL number and name must be unique among all IPv6 ACLs. You can assignan IPv4 ACL and an IPv6 ACL the same number and name.Match orderThe rules in an ACL are sorted in a specific order. When a packet matches a rule, the device stops thematch process and performs the action defined in the rule. If an ACL contains overlapping or conflictingrules, 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 arule with a higher ID. If you use this approach, carefully check the rules and their order.• auto—Sorts ACL rules in depth-first order. Depth-first ordering guarantees that any subset of a ruleis always matched before the rule. Table 1 lists the sequence of tie breakers that depth-first orderinguses to sort rules for each type of ACL.Table 1 Sort ACL rules in depth-first orderACL category Sequence of tie breakersIPv4 basic ACL1. More 0s in the source IP address wildcard (more 0s means a narrower IPaddress range)2. Rule configured earlierIPv4 advanced ACL3. Specific protocol type rather than IP (IP represents any protocol over IP)4. More 0s in the source IP address wildcard mask5. More 0s in the destination IP address wildcard6. Narrower TCP/UDP service port number range7. Rule configured earlierIPv6 basic ACL8. Longer prefix for the source IP address (a longer prefix means a narrower IPaddress range)9. Rule configured earlierIPv6 advanced ACL10. Specific protocol type rather than IP (IP represents any protocol over IPv6)11. Longer prefix for the source IPv6 address12. Longer prefix for the destination IPv6 address13. Narrower TCP/UDP service port number range14. Rule configured earlierEthernet frame header ACL15. More 1s in the source MAC address mask (more 1s means a smaller MACaddress)16. More 1s in the destination MAC address mask17. Rule configured earlierA wildcard mask, also called an inverse mask, is a 32-bit binary and represented in dotted decimalnotation. In contrast to a network mask, the 0 bits in a wildcard mask represent "do care" bits, and the1 bits represent "don’t care" bits. If the "do care" bits in an IP address are identical to the "do care" bitsin an IP address criterion, the IP address matches the criterion. All "don’t care" bits are ignored. The 0sand 1s in a wildcard mask can be noncontiguous. For example, 0.255.0.255 is a valid wildcard maskACL rule comments and rule range remarksYou can add a comment about an ACL rule to make it easy to understand. The rule comment appearsbelow the rule statement.