How a eui-64 ipv6 address is calculated?

[weifeng.l]

How a eui-64 ipv6 address is calculated if prefix length is longer or shorter than 64?

[Harold Ritter · Accepted solution]

If the prefix length is longer than 64,the prefix bits have precedence over the interface ID.

If the prefix length is shorter than 64, the portion between the prefix bits and the interface ID is padded with zeroes.

Hope this helps,

[deilert]

this may help you

http://cisco.com/en/US/products/sw/iosswrel/ios_abcs_ios_the_abcs_ip_version_60900aecd800c0dce.html

[weifeng.l]

Thanks every one! I have a test on cisco3640,you are right!