I've tested and running in some places dual-stacked over MPLS L3VPN (6*V*PE)... I haven't seen any problems with 6VPE via my ASR9k's as of yet... just thought I'd let you know in case you could go with 6VPE rather than 6PE and avoid your issues. Just a thought. Sorry I don't have info about 6PE and punting issues. -Aaron