The following configura tion exists on a router on one end of an IPv6 tunnel. Which type of tunnel is created by this configuration?（）
interface loopback 1
ip address 1.1.1.1 255.255.255.255
interface tunnel 2
ipv6 address 2000::1::/64
tunnel source loopback 1
tunnel destina tion 2.2.2.2
tunnel mode ipv6ip
ipv6 eigrp 1