no ipv6 nd suppress-ra
# Configure the 6to4 tunnel interface
interface Tunnel 1
tunnel mode ipv6ip 6to4
ipv6 enable
tunnel source FastEthernet 0/1
# Configure the route to the tunnel
ipv6 route 2002::/16 Tunnel 1
# Configure the route to the 6to4 relay router to access 6bone
ipv6 route ::/0 2002:c058:6301::1
ISP 6to4 Relay Router configuration
# Connect the interfaces of the IPv4 network
interface FastEthernet 0/1
no switchport
ip address 192.88.99.1 255.255.255.0
# Configure the 6to4 tunnel interface
interface Tunnel 1
tunnel mode ipv6ip 6to4
ipv6 enable
tunnel source FastEthernet 0/1
# Configure the route to the tunnel
ipv6 route 2002::/16 Tunnel 1