HP 6125XLG R2306-HP 6125XLG Blade Switch Layer 3 - IP Services Command Referen - Page 60
nbns-list, Specifies the offset to match the option, in the range of 0 to 254 bytes. If
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offset offset: Specifies the offset to match the option, in the range of 0 to 254 bytes. If the offset argument is not specified, the server matches the entire option with the rule. length length: Matches the specified length of the option, in the range of 1 to 128 bytes. The specified length must be the same as the hex-string length. Usage guidelines You can configure multiple match rules for a DHCP the user class. The DHCP server matches DHCP requests against the match rules. A DHCP client matches the DHCP user class as long as it matches one of the specified rules. The match operation follows these guidelines: • If only the option-code argument is specified in the rule, packets containing the option match the rule. • If only the option-code and hex-string arguments are specified in the rule, packets that have the specified hex string in the specified option match the rule. • If the option-code, hex-string, offset and length arguments are specified in the rule, packets match the rule as long as their content from offset+1 bit to offset+length bit in the specified option is the same as the specified hex string. • If the option-code, hex-string, and mask arguments are specified in the rule, the DHCP server ANDs the content from the first bit to the mask-1 bit in the specified option with the mask, and then compares the result with the result of the AND operation between hex-string and mask. If the two results are the same, the received packet matches the rule. The option-code specified by different if-match option commands can be the same. Examples # Specify that packets containing Option 82 match the DHCP user class contain-option82. system-view [Sysname] dhcp server class contain-option82 [Sysname-dhcp-class-contain-option82] if-match option 82 # Specify that packets containing Option 82 whose first three bytes is 0x13ae92 match the DHCP user class exam. system-view [Sysname] dhcp server class exam [Sysname-dhcp-class-exam] if-match option 82 hex 13ae92 offset 0 length 3 # Specify that packets containing Option 82 whose highest bit of the fourth byte is 1 match the DHCP user class exam. system-view [Sysname] dhcp class exam [Sysname-dhcp-class-exam] if-match option 82 hex 00000080 mask 00000080 Related commands dhcp class nbns-list Use nbns-list to specify WINS server addresses in a DHCP address pool. Use undo nbns-list to remove the specified WINS server addresses. 52