The first address is an IPv4 compatible IPv6 address and can therefore not be configured on an interface.
It could be used as a next hop address for a route going over an IPv6 in IPv4 tunnel as follow:
ipv6 route ::/0 ::10.1.1.1
Hope this helps,
Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
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