SLAAC

[jonk34567]

#int fa 0/0

# ipv6 add autoconfig 

#no shut 

is the above command enough to configure ipv6 address ?

[Harold Ritter]

This command will enable IPv6 on the router interface, but as a client. This means that you need to have another router present on that interface to send router advertisement. If you want the router to act as a router on thath interface and to send a router advertisement, you would rather use the "ipv6 addres <ipv6 address>" on that interface.

Regards,

[jonk34567]

" ipv6 add autoconfig " this command allow our router to recieve only the Network portion of the ipv6 address. so how the host portion of the ipv6 address will be configured ?

[Harold Ritter]

Hi,

In IOS, when doing SLAAC, the last 64 bits are assigned using the EUI-64 algorithm.

Please refer to the following document for more information about EUI-64.

https://supportforums.cisco.com/t5/network-infrastructure-documents/understanding-ipv6-eui-64-bit-address/ta-p/3116953

Regards,

[jonk34567]

Does that Happen automatically or do we need to issue any additional command so the host portion of the address will be issued by eui-64 algorithm ?

[Harold Ritter · Accepted solution]

Hi,

This is the default behavior. No additional command is required.

Regards,