1 - yes, in fact I dont have CE, all the machines is direct connected in PE1 in sub interface Fast, and in the another side of VRF I have the server which is diretced connnected to the Pe2 in fast too. but the routing is OK.
2 - If I use Serial ou even I put a CE with 2 Fast Interface link this : MAchines-->Fa(CE)Fa-->Pe1---MPLS CORE-->Pe2-->server
It works fine, seems link Fast Issue (arp, something like that).
Iam sure some kind of logs of the ICMP packets would help to see if the server is receiving the echo request and what is the return ICMP error messages on both of the PEs ? It is not an issue with MPLS as pointed earlier.
A wild idea will be there is some kind of NAT based restriction (D-NAT) and you have run out of IP pools :).
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