For example, the IPv6 prefix is 2001::/64 and the embedded IPv4 address is 192.168.1.1. In 
the  ISATAP  address,  the  IPv4  address  is  denoted  as  the  hexadecimal  numeral  of 
C0A8:0101. Therefore, its corresponding ISATAP address is as follows: 
2001::0000:5EFE:C0A8:0101 
33.2   IPv6 Tunnel Configuration 
33.2.1    Configuring Manual IPv6 Tunnels 
This section explains how to configure manual tunnels. 
To  configure  a  manual  tunnel,  configure  an  IPv6  address  on  the  tunnel  interface  and 
manually  configure  the  source  interfaceand  destination  interfaceIPv4  addresses  of  the 
tunnel. Then, configure the hosts or routers at the two ends of the tunnel to ensure that they 
support the dual stacks (the IPv6 and IPv4 protocol stacks). 
Be sure not to configure a manual tunnel with a same address as tunnel 
source and tunnel destination addresses on a switch. 
Brief steps 
config terminal 
interface tunnel tunnel-num 
tunnel mode ipv6ip 
ipv6 enable 
tunnel source {ip-address | type num} 
tunnel destination ip-address 
end 
Detailed steps 
Specify a tunnel interface number to create a tunnel 
interface and enter the interface configuration mode. 
Enable the IPv6 function of the interface. You can also 
configure the IPv6 address to directly enable the IPv6 
function of the interface.