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How a eui-64 ipv6 address is calculated?

weifeng.l
Level 1
Level 1

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

1 Accepted Solution

Accepted Solutions

Harold Ritter
Spotlight
Spotlight

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,

Regards,
Harold Ritter, CCIE #4168 (EI, SP)

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3 Replies 3

Harold Ritter
Spotlight
Spotlight

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,

Regards,
Harold Ritter, CCIE #4168 (EI, SP)

weifeng.l
Level 1
Level 1

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