What's the purpose when we config ipv6 address for an interface with 128bit mask

What's the purpose when we config ipv6 address for an interface with 128bit mask?
Thanks

If you configure a loopback-interface you can use a /128 there.
"Normal" interfaces should always use /64 (RFC 4291) while on router-to-router-links you can use a /127 (RFC 6164).
Don't stop after you've improved your network! Improve the world by lending money to the working poor:
http://www.kiva.org/invitedby/karsteni

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