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QID:AN668 IPv6 address using EUI-64 format

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QID:AN668 IPv6 address using EUI-64 format
tmcmahon33 Offline
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#1
10-04-2023, 04:15 PM (This post was last modified: 10-04-2023, 04:17 PM by tmcmahon33.)
The answer provided is the following:
2001:DB8:D8D2:1009:10A0:ABFF:FECC:1 eui-64
(Not sure where 10 is coming from?)

Possible correction?
Shouldn't the answer use the MAC address that is shown in the Exhibit:
2001:DB8:D8D2:1009:12A0:ABFF:FECC:1 eui-64
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help_desk Offline
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#2
01-13-2024, 02:18 PM (This post was last modified: 01-13-2024, 02:19 PM by help_desk.)
(10-04-2023, 04:15 PM)tmcmahon33 Wrote: The answer provided is the following:
2001:DB8:D8D2:1009:10A0:ABFF:FECC:1 eui-64
(Not sure where 10 is coming from?)

Possible correction?
Shouldn't the answer use the MAC address that is shown in the Exhibit:
2001:DB8:D8D2:1009:12A0:ABFF:FECC:1 eui-64
On the R2 LAN interface, the command "ipv6 address 2001:db8:d8d2:1009::/64 eui-64" is utilized to instruct the router to automatically assign an IPv6 address for this interface. R2 derives the IPv6 address from the MAC address of LAN interface 12A0.ABDD.0002 by inserting FFFE between the two halves, resulting in a 64-bit address 2001:DB8:D8D2:1009:12A0:ABFF:FEdd:0002.

To modify the universal/local (U/L) flag (bit 7) in the OUI portion of the address, we note that 12 (in hex) is equivalent to 0001 0010 (in binary). Flipping the 7th bit yields 0001 0000, which is 10 in hex. Therefore, the modified EUI-64 IPv6 address becomes 2001:DB8:D8D2:1009:10A0:ABFF:FECC:1.
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