Hi Davis,
There’s a lot of things that could be wrong. Here’s a simple checklist you can use:
Here’s what you should check and in what order:
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Make sure your PE/P routers have established LDP neighbor adjacencies using loopback interfaces as the transport addresses.
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Make sure the VRF is created on both PE routers.
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Make sure you use the correct RD for each VRF.
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Make sure you have the correct import/export route-targets.
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Check if you see routes in the VRF routing table on the PE routers.
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Check if you have an IBGP neighbor adjacency between the PE routers for the VPN address-family.
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Make sure that extended communities are sent between the PE routers.
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Make sure you see VPN routes on each PE router.
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Make sure you see routes on both CE routers.
These are basically all the things you should check.
Rene