H3C S5820X Series Configuration Manual

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Contents

H3C S5820X Series Configuration Manual Manual pdf 15 page image

3ACL category Sequence of tie breakersIPv4 advanced ACL1. VPN instance2. Specific protocol type rather than IP (IP represents any protocol over IP)3. More 0s in the source IP address wildcard mask4. More 0s in the destination IP address wildcard5. Narrower TCP/UDP service port number range6. Smaller IDIPv6 basic ACL1. Longer prefix for the source IP address (a longer prefix means a narrower IPaddress range)2. Smaller IDIPv6 advanced ACL1. Specific protocol type rather than IP (IP represents any protocol over IPv6)2. Longer prefix for the source IPv6 address3. Longer prefix for the destination IPv6 address4. Narrower TCP/UDP service port number range5. Smaller IDEthernet frame header ACL1. More 1s in the source MAC address mask (more 1s means a smaller MACaddress)2. More 1s in the destination MAC address mask3. Smaller IDNOTE:A 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 the 1bits represent 'don’t care' bits. If the 'do care' bits in an IP address are identical to the 'do care' bits in anIP address criterion, the IP address matches the criterion. All 'don’t care' bits are ignored. The 0s and 1sin a wildcard mask can be noncontiguous. For example, 0.255.0.255 is a valid wildcard mask.ACL rule numberingWhat is the ACL rule numbering stepIf you do not assign an ID for the rule you are creating, the system automatically assigns it a rule ID. Therule numbering step sets the increment by which the system automatically numbers rules. For example, thedefault ACL rule numbering step is 5. If you do not assign IDs to rules you are creating, they arenumbered 0, 5, 10, 15, and so on. The wider the numbering step, the more rules you can insert betweentwo rules.By introducing a gap between rules rather than contiguously numbering rules, you have the flexibility ofinserting rules in an ACL. This feature is important for a config order ACL, where ACL rules are matchedin ascending order of rule ID.Automatic rule numbering and renumberingThe ID automatically assigned to an ACL rule takes the nearest higher multiple of the numbering step tothe 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 willbe numbered 0.