Multi-hop MP-eBGP connection

Hi All,

i have a Topology as below
                       |---ebgp---|
Site 1 |---- R7 --- R2 ---- R6 ----R9 ----| Site 2
               |----- MP-ebgp ----------|

Red color is AS 1
Green color is AS 2

the result that i had configured, it can see the site 2 route from site 1
howeve , it can not be pingable. i don't know the result why?
may someone have any advise or suggestion on it ?

here is the configruation that i copied on one side

R7

----
router bgp 27
 address-family ipv4
  neighbor 8.8.0.2 activate
  neighbor 8.8.0.2 send-community
  neighbor 8.8.0.2 next-hop-self
 exit-address-family
 !
 address-family vpnv4
  neighbor 8.8.0.2 activate
  neighbor 8.8.0.2 send-community extended
  neighbor 8.8.0.2 next-hop-self
  neighbor 8.8.0.9 activate
  neighbor 8.8.0.9 send-community extended
  neighbor 8.8.0.9 next-hop-unchanged
 exit-address-family
R2
----
router bgp 27
 neighbor 8.8.26.6 remote-as 69
 !
 address-family ipv4
  neighbor 8.8.0.7 activate
  neighbor 8.8.0.7 send-community
  neighbor 8.8.0.7 next-hop-self
  neighbor 8.8.0.7 send-label
  neighbor 8.8.26.6 activate
  neighbor 8.8.26.6 send-community both
  neighbor 8.8.26.6 send-label
 exit-address-family
 !
 address-family vpnv4
  neighbor 8.8.0.7 activate
  neighbor 8.8.0.7 send-community extended
  neighbor 8.8.0.7 next-hop-self
 exit-address-family
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