ipv6 over ipv4 tunneling:

cisco(config)# interface tunnel test
cisco(config-if)# tunnel description test
cisco(config-if)# tunnel source interface-id
cisco(config-if)# tunnel destination A.B.C.D
cisco(config-if)# ipv6 address X:X:X:X::X/X
cisco(config-if)# tunnel mode ipv6ip
cisco(config-if)# ipv6 enable

ipv6 over ipv6 tunneling:

cisco(config)# interface tunnel test
cisco(config-if)# tunnel description test
cisco(config-if)# tunnel source interface-id
cisco(config-if)# tunnel destination A:B:C:D:E:F:G:H
cisco(config-if)# ipv6 address A:B:C:D:E:F:G:H/X
cisco(config-if)# tunnel mode ipv6ip
cisco(config-if)# ipv6 enable

ipv6 route configuration:

cisco(config)# ipv6 route

MTU configuration:

cisco(config-if)# ipv6 mtu VALUE MTU (bytes)

ipv6 ping:

# ping6 -c 1 2001:660:7303:7001::1

ipv6 traceroute:

# traceroute6 www.bugrakeskin.com

ipv6 tracepath:

# tracepath6 www.bugrakeskin.com