generic v6 tunneling

[IPSix Developer]

1)With ref to section 3.3 of RFC 2473 :

"The tunnel exit-point node, which decapsulates the tunnel packets, and the destination node, which receives the resulting original packets can be the same node".

Does it mean tunnel exit-point IPv6 address and original packets destination IPv6 address are same? If they are
same, how do we configure the route for the destination V6 address at the tunnel entry point?

2)With ref to section 7.1(a) of RFC 2473:

When the IPv6 packet size is larger than IPv6 min link MTU, the ICMPv6 pkt too big msg is sent with MTU as 
max(tunnel MTU, IPv6 min link MTU) . 

If the furthur received packets' size is larger than IPv6 min link MTU, again TOO BIG message will be sent and a looping will occur? how to avoid this?