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Configuring ipv6 on a cisco router interface with a IPv6 address in EUI-format


Description : This lab demonstrates the steps required to configure ipv6 address on a cisco router interface in EUI-64 format.

Instructions

1. Enter into privileged mode on router R1.
2. Enter into global configuration mode.
3. Enter the command "ipv6 unicast-routing" that enables the forwarding of IPv6 unicast datagrams globally on the router.
4. Assign a IPv6 address to the interface in EUI-format and exit.
5. Issue the appropriate show command to verify the configuration.

R1>enable
R1#configure terminal
R1(config)#ipv6 unicast-routing
R1(config)#interface serial 0
R1(config-if)#ipv6 address 3001:ac56:0:1/64 eui-64
R1(config-if)#exit
R1(config)#exit
R1#show ipv6 interface s0

Note: In EUI-64 format, the remaining 64 bits are automatically generated using MAC address but MAC addresses are 6 bytes (48 bits) in length, so for a host to automatically decide on a value to use in the 8-byte (64-bit) interface ID field IPv6 fills in 2 more bytes. To do so, IPv6 separates the MAC address into two 3-byte halves, and inserts hex FFFE in between the halves, to form the interface ID field, as well as setting 1 special bit to binary 1.

This format, called the EUI-64 format and this is termed as stateless autoconfiguration which is the mechanism that allows nodes on a network to configure their IPv6 addresses themselves without any intermediary device, such as a DHCP server.

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