There is no such migration document available, till my awareness is. Although Vivek Alwayns book is a good place to start understanding the nitty grities.
No you dont need to migrate your network to ATM or FR as its already on IP.
Here is a high level summary of the migration steps to be followed:
1) Migrate the Core for Label Switching.
2) Enable all service including Internet, Central Hosted Service Like Mail, Telephony etc onto a dual connected scenario. That is each service will have two links one for VRF and other into Global Table.
3) Start migrating customers one at a time,
when you put them in VRF they acces all the services as is through VRF and who are left over they access through global table.
This requires each VPN/Customer to be migrated at a time. Hope this method suits you, as its very subjective.
Also you can read through these previous post,
1)MPLS: Redistribute from VRF to Global
2)best internet access method over MPLS?
All this would you a fair idea of all hte high level tasks involved. Then you have to start working out everything into miute details, considering all the services you want to deploy.
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