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EUI-64 in the CCNP exam

notaciscoguy
Level 1
Level 1

so I am studying to take the ensld 300-420 exam and am using the official cert guide 2nd ed. as my primary resource. moving through the IPv6 section it states that for eui-64 addresses you just split the mac in half and insert FFFE. this is a pain because I used to teach networking and half of my textbooks make this exact statement, while the other half also state that you have to flip the 7th bit... so my question is what is the official answer that cisco wants? is their official cert guide wrong? (not a surprise since it looks like Odom made an intern write his last CCNA guide from memory), or is the exam itself wrong?

1 Accepted Solution

Accepted Solutions

Harold Ritter
Cisco Employee
Cisco Employee

Hi @notaciscoguy ,

The right answer should be the one where you insert the FFFE value and invert the 7th bit (universal bit) as stated in RFC4291 appendix A.

https://datatracker.ietf.org/doc/html/rfc4291#appendix-A

Regards,

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

View solution in original post

1 Reply 1

Harold Ritter
Cisco Employee
Cisco Employee

Hi @notaciscoguy ,

The right answer should be the one where you insert the FFFE value and invert the 7th bit (universal bit) as stated in RFC4291 appendix A.

https://datatracker.ietf.org/doc/html/rfc4291#appendix-A

Regards,

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México