![]() The right-most column lists that MAC address for each case, which you should see in the various mac-address address commands in the configuration examples. All you have to do to figure out what MAC address to use is to remove the FFFE, and then invert that 7 th bit. In that form, those last 16 hex digits make it obvious where the FFFE sits. The table lists the unabbreviated last 16 hex digits of the IPv6 address from table 1. Table 3 then shows some help in seeing the MAC address needed to make the router calculate the desired IPv6 address. With the eui-64 parameter, the router completes the last part of the IPv6 address. You should have configured the prefix in the ipv6 address prefix/prefix-length eui-64 command, not the entire IPv6 address from the table. Table 2 re-lists the IPv6 addresses you should see by the end of the lab, along with the prefix value. Finally, the 7th bit counting from the left, started at 1, is inverted (if it was 1 it would be come 0 and vise versa) this results in 78.1234. Then, the 16-byte string ‘FF FE’ is placed between them this results in 78.1234. For example, if the MAC address 1234.5678.1234 was used, this first split would result in 1234.56 and 78.1234. The EUI-64 process takes the MAC address (12 hex digits), inserts FFFE in the middle, and inverts the 7 th bit. Note that non-Ethernet interfaces like serial interfaces do not have MAC addresses, so when building an IPv6 address for a serial interface, IOS borrows the MAC address from lowest numbered Ethernet interface on the device. This lab uses a configured MAC address so that the address value is more obvious. Cisco devices use a MAC address from a couple of sources: either the MAC address assigned to the interface by the manufacturer, or the address configured with the mac-address command. The EUI-64 process uses as input the MAC address of the interface. Assume all router interfaces shown in the lab are up and working.įigure 1: EUI-64 IPv6 Addressing Topology Initial ConfigurationĮxamples 1, 2, 3, and 4 show the beginning configuration state of R1, R2, R3, and R4.Use the mac-address command to configure each interface’s MAC address, so that the resulting IPv6 address will match table 1.Use EUI-64 addressing on all router interfaces.In this lab, configure all router interfaces using the modified EUI-64 feature to create the IPv6 addresses listed in the table. ![]() Then it combines the 64-bit prefix configured on the ipv6 address interface subcommand, with this EUI-64 calculated 64-bit value, to create the interface IPv6 address. With this feature, the router creates the EUI-64 value by taking the interface MAC address (48 bits, or 12 hex digits), inverts the 7 th bit, and inserts hex FFFE into the middle. ![]() Routers can be configured with full IPv6 unicast addresses on their interfaces, but they can also be configured using the modified EUI-64 address assignment feature.
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