en
conf t

ipv6 unicast-routing

int g0/0
 ipv6 address 2001:1::1/64
 no shut
exit

int g0/1
 ipv6 address 2001:2::1/64
 no shut
exit

ipv6 route 2001:3::0/64 2001:2::2

do show ipv6 route

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Configure R2 yourself