[c-nsp] Very basic MPLS VPN issue

[selamat pagi]

Setup
CE (loopback 3 on R3 vrf BLUE )   -   PE1 R3 -    MPLS    -- PE2 R4 -- CE
(loopback4 on R4 vrf BLUE

*ping between lo 3 and lo 4 does not work. *
both lo are in vrf BLUE

- vrf routing table show routes / vpnv4 BGP neigbor is up

R3#sh ip route vrf BLUE
!
     3.0.0.0/32 is subnetted, 1 subnets
C       3.3.3.3 is directly connected, Loopback3
     4.0.0.0/32 is subnetted, 1 subnets
B       4.4.4.4 [200/0] via 150.1.4.4, 00:07:27


R3#sh ip bgp vpnv4 all su
!
Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down
State/PfxRcd
150.1.4.4       4   100      15      16        5    0    0 00:09:52



Such a simple setup, but I just cannot figure out what's wrong.
 Any feedback is highly welcome :-)

cheers, keti

Configuration / sh outputs
------------------------------------
R3
ip vrf BLUE
 rd 1:100
 route-target export 1:100
 route-target import 1:100
!
interface Loopback3
 ip vrf forwarding BLUE
 ip address 3.3.3.3 255.255.255.255
router bgp 100
 no synchronization
 bgp log-neighbor-changes
 neighbor 150.1.4.4 remote-as 100
 neighbor 150.1.4.4 update-source Loopback0
 no auto-summary
 !
 address-family vpnv4
 neighbor 150.1.4.4 activate
 neighbor 150.1.4.4 send-community both
 exit-address-family
 !
 address-family ipv4 vrf BLUE
 redistribute connected
 no auto-summary
 no synchronization
 exit-address-family


R4

ip vrf BLUE
 rd 1:100
 route-target export 1:100
 route-target import 1:100

interface Loopback4
 ip vrf forwarding BLUE
 ip address 4.4.4.4 255.255.255.255

router bgp 100
 no synchronization
 bgp log-neighbor-changes
 neighbor 150.1.3.3 remote-as 100
 neighbor 150.1.3.3 update-source Loopback0
 no auto-summary
 !
 address-family vpnv4
 neighbor 150.1.3.3 activate
 neighbor 150.1.3.3 send-community both
 exit-address-family
 !
 address-family ipv4 vrf BLUE
 redistribute connected
 no auto-summary
 no synchronization
 exit-address-family
!


R3#sh ip cef vrf BLUE 4.4.4.4 det
4.4.4.4/32, version 2, epoch 0, cached adjacency to Serial2/0
0 packets, 0 bytes
  tag information set
    local tag: VPN-route-head
    fast tag rewrite with
        Recursive rewrite via 150.1.4.4/32, tags imposed {19}
  via 150.1.4.4, 0 dependencies, recursive
    next hop 150.1.13.1, Serial2/0 via 150.1.4.4/32
    valid cached adjacency
    tag rewrite with
        Recursive rewrite via 150.1.4.4/32, tags imposed {19}


R3#sh mpls forwarding-table
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop
tag    tag or VC   or Tunnel Id      switched   interface
16     Untagged    150.1.24.0/24     0          Se2/0      point2point
17     Untagged    150.1.4.4/32      0          Se2/0      point2point
18     Untagged    150.1.12.0/24     0          Se2/0      point2point
19     Aggregate   3.3.3.3/32[V]     0
R3#
R4#sh mpls forwarding-table
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop
tag    tag or VC   or Tunnel Id      switched   interface
16     Untagged    150.1.3.3/32      0          Se2/0.1    point2point
17     Untagged    150.1.13.0/24     0          Se2/0.1    point2point
18     Untagged    150.1.12.0/24     0          Se2/0.1    point2point
19     Aggregate   4.4.4.4/32[V]     0
R4#

R4#sh ip cef vrf BLUE 3.3.3.3
3.3.3.3/32, version 2, epoch 0, cached adjacency to Serial2/0.1
0 packets, 0 bytes
  tag information set
    local tag: VPN-route-head
    fast tag rewrite with
        Recursive rewrite via 150.1.3.3/32, tags imposed {19}
  via 150.1.3.3, 0 dependencies, recursive
    next hop 150.1.24.2, Serial2/0.1 via 150.1.3.3/32
    valid cached adjacency
    tag rewrite with
        Recursive rewrite via 150.1.