VRF-VRF解决方案技术上最简单的，没有在“AS内部的MPLS-×××”上作任何扩展，完全应用已有技术实现 。
ASBR对等体间，通过划分子接口方式，每个子接口分别绑定一个VRF，保证域间传播路由的私有性。
ASBR对等体间，只运行普通BGP，不运行LDP，交互IPV4路由。
每个PE-ASBR路由器都把对方PE-ASBR路由器当做CE路由器看待。
比较适合运用在AS域间交互×××(VRF)数量较少的情况。但是扩展性较差。
实验拓扑图：
1.路由器R1上lo0:1.1.1.1/32,路由器R2上lo0:2.2.2.2/32，路由器R3上lo0:3.3.3.3/32，路由器R4上lo0:4.4.4.4/32，路由器R5上lo0:5.5.5.5/32，路由器R6上lo0:6.6.6.6/32。
2.R5和R6是CE路由器，R1，R2，R3，R4是PE路由器，省去了P路由器，不影响实验。R1和R2之间IGP：OSPF，bgp为MBGP, R2和R3之间是EBGP，R3和R4之间，IGP是OSPF，bgp为MBGP，
3.一下为R1-R6的配置文件：
R1：
hostname R1
!
!
ip vrf r5
rd 1:1
route-target export 1:1
route-target import 1:1
interface Loopback0
ip address 1.1.1.1 255.255.255.255
!
interface FastEthernet0/0
ip address 12.1.1.1 255.255.255.0
speed auto
duplex auto
mpls ip
!
interface FastEthernet0/1
ip vrf forwarding r5
ip address 15.1.1.1 255.255.255.0
speed auto
duplex auto
!
router ospf 2 vrf r5
redistribute bgp 12 subnets
network 0.0.0.0 255.255.255.255 area 0
!
router ospf 1
network 0.0.0.0 255.255.255.255 area 0
!
router bgp 12
bgp log-neighbor-changes
no bgp default ipv4-unicast
neighbor 2.2.2.2 remote-as 12
neighbor 2.2.2.2 update-source Loopback0
!
address-family ipv4
exit-address-family
!
address-family ***v4
neighbor 2.2.2.2 activate
neighbor 2.2.2.2 send-community extended
exit-address-family
!
address-family ipv4 vrf r5
redistribute ospf 2 match internal external 1 external 2
exit-address-family
!
路由器R2：
hostname R2
!
ip vrf r5
rd 1:1
route-target export 1:1
route-target import 1:1
!
interface Loopback0
ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
ip address 12.1.1.2 255.255.255.0
speed auto
duplex auto
mpls ip
!
interface FastEthernet0/1
ip vrf forwarding r5
ip address 23.1.1.2 255.255.255.0
speed auto
duplex auto
!
router ospf 1
network 2.2.2.2 0.0.0.0 area 0
network 12.1.1.0 0.0.0.255 area 0
!
router bgp 12
bgp log-neighbor-changes
no bgp default ipv4-unicast
neighbor 1.1.1.1 remote-as 12
neighbor 1.1.1.1 update-source Loopback0
neighbor 23.1.1.3 remote-as 34
!
address-family ipv4
exit-address-family
!
address-family ***v4
neighbor 1.1.1.1 activate
neighbor 1.1.1.1 send-community extended
exit-address-family
!
address-family ipv4 vrf r5
neighbor 23.1.1.3 remote-as 34
neighbor 23.1.1.3 activate
exit-address-family
!
路由器R3：
!
hostname R3
!
ip vrf r6
rd 2:2
route-target export 2:2
route-target import 2:2
!
interface Loopback0
ip address 3.3.3.3 255.255.255.255
!
interface FastEthernet0/0
ip address 34.1.1.3 255.255.255.0
speed auto
duplex auto
mpls ip
!
interface FastEthernet0/1
ip vrf forwarding r6
ip address 23.1.1.3 255.255.255.0
speed auto
duplex auto
!
router ospf 1
network 3.3.3.3 0.0.0.0 area 0
network 34.1.1.0 0.0.0.255 area 0
!
router bgp 34
bgp log-neighbor-changes
no bgp default ipv4-unicast
neighbor 4.4.4.4 remote-as 34
neighbor 4.4.4.4 update-source Loopback0
neighbor 23.1.1.2 remote-as 12
!
address-family ipv4
exit-address-family
!
address-family ***v4
neighbor 4.4.4.4 activate
neighbor 4.4.4.4 send-community extended
exit-address-family
!
address-family ipv4 vrf r6
neighbor 23.1.1.2 remote-as 12
neighbor 23.1.1.2 activate
exit-address-family
路由器R4：
!
hostname R4
!
!
ip vrf r6
rd 2:2
route-target export 2:2
route-target import 2:2
!
interface Loopback0
ip address 4.4.4.4 255.255.255.255
!
interface FastEthernet0/0
ip address 34.1.1.4 255.255.255.0
speed auto
duplex auto
mpls ip
!
interface FastEthernet0/1
ip vrf forwarding r6
ip address 46.1.1.4 255.255.255.0
speed auto
duplex auto
!
router ospf 2 vrf r6
redistribute bgp 34 subnets
network 0.0.0.0 255.255.255.255 area 0
!
router ospf 1
network 4.4.4.4 0.0.0.0 area 0
network 0.0.0.0 255.255.255.255 area 0
!
router bgp 34
bgp log-neighbor-changes
no bgp default ipv4-unicast
neighbor 3.3.3.3 remote-as 34
neighbor 3.3.3.3 update-source Loopback0
!
address-family ipv4
exit-address-family
!
address-family ***v4
neighbor 3.3.3.3 activate
neighbor 3.3.3.3 send-community extended
exit-address-family
!
address-family ipv4 vrf r6
redistribute ospf 2 match internal external 1 external 2
exit-address-family
!
路由器R5：
!
hostname R5
!
interface Loopback0
ip address 5.5.5.5 255.255.255.255
!
interface FastEthernet0/0
no ip address
shutdown
speed auto
duplex auto
!
interface FastEthernet0/1
ip address 15.1.1.5 255.255.255.0
speed auto
duplex auto
!
router ospf 2
network 0.0.0.0 255.255.255.255 area 0
!
路由器R6：
!
hostname R6
!
interface Loopback0
ip address 6.6.6.6 255.255.255.255
!
interface FastEthernet0/0
no ip address
shutdown
speed auto
duplex auto
!
interface FastEthernet0/1
ip address 46.1.1.6 255.255.255.0
speed auto
duplex auto
!
router ospf 2
network 0.0.0.0 255.255.255.255 area 0
!