ipv6 eui-64

Unanswered Question
Aug 16th, 2007

I'm taking the CCIE R&S in november and still unclear on when to use and not use the eui-64 command when configuring ipv6 ip addresses.

I found this statement on the cisco website: "Addresses with a prefix of 2000::/3 (001) through E000::/3 (111) are REQUIRED to have 64-bit interface identifiers in the EUI-64 format..."

but the configuration examples do not use the eui-64 command for ipv6 addresses within this range.

Could someone clarify this?

I have this problem too.
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royalblues Fri, 08/17/2007 - 04:45

Specifying the ipv6 address ipv6-prefix/prefix-length command with the eui-64 keyword configures site-local and global IPv6

addresses with an interface identifier (ID) in the low-order 64 bits of the IPv6 address.

Only the 64-bit network prefix for the address needs to be specified; the last 64 bits are automatically computed

from the interface ID.

Narayan

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Posted August 16, 2007 at 11:12 AM
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