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SLAAC not using EUI-64

Pedro Matias
Level 1
Level 1

I have configured 2 /64 subnets, each consisting of one router and one VPCS. The only command I inserted in the VPCS was ip auto. For some reason, they didn't configure themselves using EUI-64. The global unicast address looks like it almost used EUI-64. However, in both of them the first 8 bits of the suffix should be 0x02, but they are 0x20. Why did this happen?

1 Accepted Solution

Accepted Solutions

Harold Ritter
Cisco Employee
Cisco Employee

Hi @Pedro Matias ,

You are absolutely right. The EUI-64 is incorrectly generated for the SLAAC prefixes. The link local address EUI-64 is correctly generated though. It is looks like a bug in the VPC code. This should not prevent these addresses from working though.

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 @Pedro Matias ,

You are absolutely right. The EUI-64 is incorrectly generated for the SLAAC prefixes. The link local address EUI-64 is correctly generated though. It is looks like a bug in the VPC code. This should not prevent these addresses from working though.

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