HP 6120XG HP ProCurve Series 6120 Blade Switches IPv6 Configuration Guide - Page 133
Example., four IPv6-based stations to access the switch. In this mask, all bits except
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IPv6 Management Security Features Authorized IP Managers for IPv6 Example. Figure 6-3 shows an example in which a mask that authorizes switch access to four management stations is applied to the IPv6 address: 2001:DB8:0000:0000:244:17FF:FEB6:D37D. The mask is: FFFF:FFFF:FFFF:FFF8:FFFF:FFFF:FFFF:FFFC. 1st 2nd 3rd 4th 5th 6th 7th 8th Manager- or Operator-Level Access Block Block Block Block Block Block Block Block IPv6 Mask FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFC The "F" value in the first 124 bits of the IPv6 Address 2001 DB8 0000 0000 244 17FF FEB6 D37D mask specifies that only the exact value of each corresponding bit in an authorized IPv6 address is allowed. However, the "C" value in the last four bits of the mask allows four possible combinations (D37C, D37D, D37E, and D37F) in the last block of an authorized IPv6 address. Figure 6-3. Example: Mask for Configuring Four Authorized IPv6 Manager Stations Last block in Mask: FFFC Last block in IPv6 Address: D37D Bit Numbers Bit Bit Bit 15 14 13 Bit Value F FFFC: Last Block in Mask Bit Bit Bit Bit Bit 12 11 10 9 8 F Bit Bit Bit Bit Bit Bit Bit Bit 7 65 4 3 2 1 0 F C D37D: Last Block in IPv6 Address Bit Setting: = 1 (On) = 0 (Off) Figure 6-4. Example: How a Mask Determines Four Authorized IPv6 Manager Addresses As shown in Figure 6-4, if you use a mask of FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFC with an IPv6 address, you can authorize four IPv6-based stations to access the switch. In this mask, all bits except the last two are set to 1 ("on"); the binary equivalent of hexadecimal C is 1100. Therefore, this mask requires the first corresponding 126 bits in an authorized IPv6 address to be the same as in the specified IPv6 address: 2001:DB8:0000:0000:244:17FF:FEB6:D37C. However, the last two bits are set 6-8