Eui-64 keyword

Q: How deeply does Acing the CCNA Exam: Volume 1 Fundamentals and Protocols cover eui-64 keyword?

Explains command syntax and the three conversion steps, but does not extend into implementation internals.

As explained in Acing the CCNA Exam: Volume 1 Fundamentals and Protocols

An EUI-64 interface identifier is a 64-bit IPv6 interface identifier derived using the Extended Unique Identifier format.

The eui-64 keyword tells Cisco IOS to generate an IPv6 interface identifier automatically. Place it after a /64 prefix in the ipv6 address command. IOS derives the 64-bit host portion from the interface’s 48-bit MAC address. section 20.4.2 section 20.6

Convert the MAC address into the Modified EUI-64 identifier in three steps:

Divide the 48-bit MAC address into two halves. section 20.4.2
Insert the reserved 16-bit value fffe between the halves. section 20.4.2
Invert the seventh bit, which is the third bit of the second hexadecimal digit. section 20.4.2
Combine the resulting identifier with the configured /64 prefix to form the complete IPv6 address. section 20.4.2 section 20.6

Cisco IOS configuration

R1(config)# interface g0/2 R1(config-if)# ipv6 address 2001:db8:0:2::/64 eui-64 R1(config-if)# no shutdown For MAC address 0060.2f62.b803, IOS creates interface identifier 0260:2fff:fe62:b803 and address 2001:db8:0:2:260:2fff:fe62:b803. section 20.4.2

How Acing the CCNA Exam: Volume 1 Fundamentals and Protocols covers it

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Related concepts

interface identifierproduces · An interface identifier is the portion of an IPv6 address that identifies a specific network interface within its address prefix.
mac addressuses · A MAC address is a link-layer identifier assigned to a network interface for communication over a local network link.
stateless address autoconfigurationused by · Stateless Address Autoconfiguration is an IPv6 mechanism by which a host generates its own address and obtains network configuration without a centralized address-assignment server.
ipv6 address autoconfigused by · ipv6 address autoconfig is a Cisco IOS interface command that enables an interface to obtain an IPv6 prefix through router discovery and generate an address automatically.
link-local addressproduces · An IPv6 link-local address is an IPv6 unicast address valid only for communication between devices on the same local network segment.

This explainer was generated by Manning's knowledge graph from the text of Acing the CCNA Exam: Volume 1 Fundamentals and Protocols. The section links point to the parts of the book it draws on.