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New Member

How a eui-64 ipv6 address is calculated?

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

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: How a eui-64 ipv6 address is calculated?

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,

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
3 REPLIES
Cisco Employee

Re: How a eui-64 ipv6 address is calculated?

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,

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
Silver

Re: How a eui-64 ipv6 address is calculated?

New Member

Re: How a eui-64 ipv6 address is calculated?

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

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