华为设备配置OSPF伪连接

1. 在CE1、AR6、CE2上配置普通OSPF，发布各接口的网段地址
   [CE1-GigabitEthernet0/0/0]ip add 10.1.1.4 24
   [CE1-GigabitEthernet0/0/1]ip add 40.1.1.4 24
   [CE1]ospf 1
   [CE1-ospf-1]area 0
   [CE1-ospf-1-area-0.0.0.0]network 10.1.1.0 0.0.0.255
   [CE1-ospf-1-area-0.0.0.0]network 40.1.1.0 0.0.0.255
   [AR6-GigabitEthernet0/0/1]ip add 40.1.1.6 24
   [AR6-GigabitEthernet0/0/2]ip add 50.1.1.6 24
   [AR6]ospf 1
   [AR6-ospf-1]area 0
   [AR6-ospf-1-area-0.0.0.0]network 40.1.1.0 0.0.0.255
   [AR6-ospf-1-area-0.0.0.0]network 50.1.1.0 0.0.0.255
   [CE2-GigabitEthernet0/0/0]ip add 10.2.1.5 24
   [CE2-GigabitEthernet0/0/1]ip add 50.1.1.5 24
   [CE2]ospf 1
   [CE2-ospf-1]area 0
   [CE2-ospf-1-area-0.0.0.0]network 10.2.1.0 0.0.0.255
   [CE2-ospf-1-area-0.0.0.0]network 50.1.1.0 0.0.0.255
2. 在PE、P上配置骨干网的基本BGP/MPLS IP VPN，包括：配置骨干网的IGP；配置骨干网的MPLS和LDP；在PE之间建立MP-IBGP对等体关系
   [PE1-LoopBack1]ip add 1.1.1.1 32
   [PE1-LoopBack10]ip add 5.5.5.5 32
   [PE1-GigabitEthernet0/0/0]ip add 20.1.1.1 24
   [PE1]mpls lsr-id 1.1.1.1
   [PE1]mpls
   [PE1]mpls ldp
   [PE1-GigabitEthernet0/0/0]mpls
   [PE1-GigabitEthernet0/0/0]mpls ldp
   [PE1]ospf 1 router-id 1.1.1.1
   [PE1-ospf-1]area 0
   [PE1-ospf-1-area-0.0.0.0]network 1.1.1.1 0.0.0.0
   [PE1-ospf-1-area-0.0.0.0]network 20.1.1.0 0.0.0.255
   [PE1]bgp 100
   [PE1-bgp]peer 3.3.3.3 as-number 100
   [PE1-bgp]peer 3.3.3.3 connect-interface LoopBack 1
   [PE1-bgp]ipv4-family vpnv4
   [PE1-bgp-af-vpnv4]peer 3.3.3.3 enable
   [P-LoopBack1]ip add 2.2.2.2 32
   [P]mpls lsr-id 2.2.2.2
   [P]mpls
   [P]mpls ldp
   [P-GigabitEthernet0/0/0]ip add 20.1.1.2 24
   [P-GigabitEthernet0/0/0]mpls
   [P-GigabitEthernet0/0/0]mpls ldp
   [P-GigabitEthernet0/0/1]ip add 30.1.1.2 24
   [P-GigabitEthernet0/0/1]mpls
   [P-GigabitEthernet0/0/1]mpls ldp
   [P]ospf 1 router-id 2.2.2.2
   [P-ospf-1]area 0
   [P-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0
   [P-ospf-1-area-0.0.0.0]network 30.1.1.0 0.0.0.255
   [P-ospf-1-area-0.0.0.0]network 20.1.1.0 0.0.0.255
   [PE2-LoopBack1]ip add 3.3.3.3 32
   [PE2-LoopBack10]ip add 6.6.6.6 32
   [PE2]mpls lsr-id 3.3.3.3
   [PE2]mpls
   [PE2]mpls ldp
   [PE2-GigabitEthernet0/0/0]ip add 30.1.1.3 24
   [PE2-GigabitEthernet0/0/0]mpls
   [PE2-GigabitEthernet0/0/0]mpls ldp
   [PE2]ospf 1 router-id 3.3.3.3
   [PE2-ospf-1]area 0
   [PE2-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0
   [PE2-ospf-1-area-0.0.0.0]network 30.1.1.0 0.0.0.255
   [PE2]bgp 100
   [PE2-bgp]peer 1.1.1.1 as-number 100
   [PE2-bgp]peer 1.1.1.1 connect-interface LoopBack 1
   [PE2-bgp]ipv4-family vpnv4
   [PE2-bgp-af-vpnv4]peer 1.1.1.1 enable
3. 配置PE与CE的连接：PE与CE间运行OSPF
   [PE1]ip vpn-instance vpn1
   [PE1-vpn-instance-vpn1]ipv4-family
   [PE1-vpn-instance-vpn1-af-ipv4]route-distinguisher 100:1
   [PE1-vpn-instance-vpn1-af-ipv4]vpn-target 1:1
   [PE1-GigabitEthernet0/0/1]ip binding vpn-instance vpn1
   [PE1-GigabitEthernet0/0/1]ip add 10.1.1.1 24
   [PE1]ospf 100 router-id 5.5.5.5 vpn-instance vpn1
   [PE1-ospf-100]domain-id 10
   [PE1-ospf-100]import-route bgp
   [PE1-ospf-100]area 0
   [PE1-ospf-100-area-0.0.0.0]network 10.1.1.0 0.0.0.255
   [PE1]bgp 100
   [PE1-bgp]ipv4-family vpn-instance vpn1
   [PE1-bgp-vpn1]import-route direct
   [PE1-bgp-vpn1]import-route ospf 100
   [PE2]ip vpn-instance vpn1
   [PE2-vpn-instance-vpn1]ipv4-family
   [PE2-vpn-instance-vpn1-af-ipv4]route-distinguisher 100:2
   [PE2-vpn-instance-vpn1-af-ipv4]vpn-target 1:1
   [PE2-GigabitEthernet0/0/1]ip binding vpn-instance vpn1
   [PE2-GigabitEthernet0/0/1]ip add 10.2.1.3 24
   [PE2]ospf 100 router-id 6.6.6.6 vpn-instance vpn1
   [PE2-ospf-100]import-route direct
   [PE2-ospf-100]import-route bgp
   [PE2-ospf-100]domain-id 10
   [PE2-ospf-100]area 0
   [PE2-ospf-100-area-0.0.0.0]network 10.2.1.0 0.0.0.255
   [PE2]bgp 100
   [PE2-bgp]ipv4-family vpn-instance vpn1
   [PE2-bgp-vpn1]import-route direct
   [PE2-bgp-vpn1]import-route ospf 100
   

看到去往对端CE的路由是通过用户网络的OSPF路由，不是通过骨干网的BGP路由
4. 配置伪连接
[CE1-GigabitEthernet0/0/1]ospf cost 10
[CE2-GigabitEthernet0/0/1]ospf cost 10
[PE1]int LoopBack 10
[PE1-LoopBack10]ip binding vpn-instance vpn1
[PE1-LoopBack10]ip add 5.5.5.5 32
[PE1]ospf 100
[PE1-ospf-100]area 0
[PE1-ospf-100-area-0.0.0.0]sham-link 5.5.5.5 6.6.6.6 cost 1
[PE2]int LoopBack 10
[PE2-LoopBack10]ip binding vpn-instance vpn1
[PE2-LoopBack10]ip add 6.6.6.6 32
[PE2]ospf 100
[PE2-ospf-100]area 0
[PE2-ospf-100-area-0.0.0.0]sham-link 6.6.6.6 5.5.5.5 cost 1
5. 检查配置

看到去往对端CE的路由变成了通过骨干网的BGP路由，并且有去往sham-link目的地址的路由

看到去往对端CE的OSPF路由开销变为3，下一跳为接入PE的g0/0/1接口，即，去往对端的VPN流量将通过骨干网转发

可以看到对端CE的路由是作为区域内（Intra Area）路由学到的