But, why would you do a VRF and then decide you wanted to route from that VRF to your global routing instance? And why on earth would you want to NAT between two interfaces in different VRF's.
Well, I did end up needing to and this article was very helpful.
ip vrf MyVRF
exit
interface
(no switchport) ! make routed port
ip vrf forwarding MyVRF ! associate interface with MyVRF
ip address A.B.C.D M.M.M.M
interface
switchport
switchport trunk encapsulation dot1q
(switchport nonegotiate)
switchport mode trunk
vlan 10
name WAN-VLAN
interface Vlan10
ip vrf forwarding MyVRF
ip addr E.F.G.H M.M.M.M
ip nat enable
! now the VRF-aware NAT config:
interface
ip nat enable
interface Vlan10
ip nat enable
ip access-list standard LAN-to-NAT
permit
ip nat source list LAN-to-NAT interface Vlan10 vrf MyVRF overload
! finally the def. route
ip route vrf MyVRF 0.0.0.0 0.0.0.0