拓扑如下：

这里只放PE和ASBR的配置，CE配置较为简单，由于AS100和AS200的ASBR和PE配置相似，这里只放AS100内的PE和ASBR配置

PE1：

#
 sysname PE1
#
ip vpn-instance PE1
 route-distinguisher 2:2
 vpn-target 1:1 import-extcommunity
 vpn-target 1:1 export-extcommunity
#
ospf 1
 area 0.0.0.0
  network 2.2.2.2 0.0.0.0
  network 10.0.23.2 0.0.0.0
#
ospf 2 vpn-instance PE1
 import-route bgp
 area 0.0.0.0
  network 10.0.12.2 0.0.0.0
#
 mpls lsr-id 2.2.2.2
#
vlan 1
#
mpls ldp
#
interface LoopBack0
 ip address 2.2.2.2 255.255.255.255
#
interface GigabitEthernet0/0
 port link-mode route
 combo enable copper
 ip binding vpn-instance PE1
 ip address 10.0.12.2 255.255.255.0
#
interface GigabitEthernet0/1
 port link-mode route
 combo enable copper
 ip address 10.0.23.2 255.255.255.0
 mpls enable
 mpls ldp enable
#
bgp 100
 peer 3.3.3.3 as-number 100
 peer 3.3.3.3 connect-interface LoopBack0
 #
 address-family vpnv4
  peer 3.3.3.3 enable
 #
 ip vpn-instance PE1
  #
  address-family ipv4 unicast
   import-route ospf 2
#
return

ASBR1：

#
 sysname ASBR1
#
ospf 1
 area 0.0.0.0
  network 3.3.3.3 0.0.0.0
  network 10.0.23.3 0.0.0.0
#
 mpls lsr-id 3.3.3.3
#
vlan 1
#
mpls ldp
#
interface LoopBack0
 ip address 3.3.3.3 255.255.255.255
#
interface GigabitEthernet0/0
 port link-mode route
 combo enable copper
 ip address 10.0.23.3 255.255.255.0
 mpls enable
 mpls ldp enable
#
interface GigabitEthernet0/1
 port link-mode route
 combo enable copper
 ip address 10.0.34.3 255.255.255.0
 mpls enable
#
bgp 100
 peer 2.2.2.2 as-number 100
 peer 2.2.2.2 connect-interface LoopBack0
 peer 10.0.34.4 as-number 200
 #
 address-family vpnv4
  undo policy vpn-target
  peer 2.2.2.2 enable
  peer 10.0.34.4 enable
#
return

结果是，两端CE可以通过OSPF协议收到对方的路由信息，由于PE上是吧BGP引入OSPF中，应该产生LSA 5，但是由于机制则会产生LSA 3，为了保证两端CE OSPF的连续性