Internet Connectivity for Multi - vrfs

Hi all,
Some help needed with the scenario below;
Am currently migrating our legacy IP network to MPLS.we have been able to migrate 3 seperate networks into their respective vrfs and currently only left with the internet segment which used to connect to these 3 networks via a Cisco 535 firewall.
Problem is, i have created an internet vrf and intend to export a default route within the internet vrf into the other vrfs.Which should work fine for traffic leaving these networks to the internet.
Problem is : how to handle traffic comming from the internet to these respective vrfs without having to import those routes into the internet vrf?
Why do i want this ? Currently inter-vrf traffic is via a FWSM only and would like to keep it that way. No leaking of routes from one vrf to the other.If i do import the 3 vrfs into the internet vrf, it will leak one vrf route to the other !
Any help ?

Well,
one way would be to create a VLAN subinterface per VRF in the PIX. This way all traffic to the internet would be directed towards the firewall and there you could easily control/block inter-VRF traffic.
Or you create one internet interface in the FWSM and control access there.
Regards, Martin

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