PC-CE-PE-P-PE-CE-PC组网环境下，路由可以学习到，但是无法ping通

需求：VPN1内的PC_6 ping PC_8，但是不通，在PE上查看路由已经通过MPBGP学习到了，请各位大神帮忙看下配置是否有遗漏，组网以及配置在附件里，多谢

<H3C>ping  8.0.0.2

Ping 8.0.0.2 (8.0.0.2): 56 data bytes, press CTRL_C to break

Request time out

Request time out

[6850_3_PE]display ip routing-table vpn-instance vpn1

1.0.0.0/24         O_ASE2  150 1           3.0.0.1         GE1/0/1

6.0.0.0/24         BGP     255 0           15.15.15.15     GE1/0/3

8.0.0.0/24         BGP     255 2           15.15.15.15     GE1/0/3

PE上关键配置如下：

#

ip vpn-instance vpn1

 route-distinguisher 100:1

 vpn-target 110:1 import-extcommunity

 vpn-target 110:1 export-extcommunity

#

ip vpn-instance vpn2

 route-distinguisher 200:1

 vpn-target 210:1 import-extcommunity

 vpn-target 220:1 export-extcommunity

#

 irf mac-address persistent timer

 irf auto-update enable

 undo irf link-delay

 irf member 1 priority 1

#

ospf 1 vpn-instance vpn1

 import-route direct

 import-route bgp 100

 domain-id 0.0.0.1

 vpn-instance-capability simple

 area 0.0.0.0

  network 3.0.0.0 0.0.0.255

#

ospf 2 vpn-instance vpn2

 area 0.0.0.0

  network 2.0.0.0 0.0.0.255

#

rip 1

 network 4.0.0.0 0.0.0.255

 network 13.13.13.13 0.0.0.0

#

 mpls lsr-id 13.13.13.13

#

mpls ldp

#

interface LoopBack0

 ip address 13.13.13.13 255.255.255.255

 rip 1 enable

#

interface GigabitEthernet1/0/1

 port link-mode route

 combo enable fiber

 ip binding vpn-instance vpn1

 ip address 3.0.0.2 255.255.255.0

#

interface GigabitEthernet1/0/2

 port link-mode route

 combo enable fiber

 shutdown

 ip binding vpn-instance vpn2

 ip address 2.0.0.2 255.255.255.0

#

interface GigabitEthernet1/0/3

 port link-mode route

 combo enable fiber

 ip address 4.0.0.1 255.255.255.0

 rip 1 enable

 mpls enable

 mpls ldp enable

#

bgp 100

 peer 15.15.15.15 as-number 100

 peer 15.15.15.15 connect-interface LoopBack0

 #

 address-family ipv4 unicast

  import-route rip 1

  peer 15.15.15.15 enable

 #

 address-family vpnv4

  peer 15.15.15.15 enable

 #

 ip vpn-instance vpn1

  #

  address-family ipv4 unicast

   import-route ospf 1

   network 3.0.0.0 255.255.255.0

#