1. 配置接口IP地址
[ASBR-PE1-LoopBack0]ip add 1.1.1.1 32
[ASBR-PE1-GigabitEthernet0/0/0]ip add 12.1.1.1 24
[ASBR-PE1-GigabitEthernet0/0/1]ip add 20.1.1.1 24
[ASBR-PE2-LoopBack0]ip add 2.2.2.2 32
[ASBR-PE2-GigabitEthernet0/0/0]ip add 12.1.1.2 24
[ASBR-PE2-GigabitEthernet0/0/1]ip add 30.1.1.2 24
[PE1-LoopBack0]ip add 3.3.3.3 32
[PE1-GigabitEthernet0/0/0]ip add 20.1.1.3 24
[PE1-GigabitEthernet0/0/1]ip add 10.1.1.3 24
[PE2-LoopBack0]ip add 4.4.4.4 32
[PE2-GigabitEthernet0/0/0]ip add 30.1.1.4 24
[PE2-GigabitEthernet0/0/1]ip add 10.2.1.4 24
[CE1-GigabitEthernet0/0/0]ip add 10.1.1.5 24
[CE2-GigabitEthernet0/0/0]ip add 10.2.1.6 24
2. 在AS100和AS200的MPLS骨干网上分别配置OSPF协议，实现各自骨干网ASBR-PE和PE之间的互通
[ASBR-PE1]ospf 1
[ASBR-PE1-ospf-1]area 0
[ASBR-PE1-ospf-1-area-0.0.0.0]network 12.1.1.0 0.0.0.255
[ASBR-PE1-ospf-1-area-0.0.0.0]network 20.1.1.0 0.0.0.255
[ASBR-PE1-ospf-1-area-0.0.0.0]network 1.1.1.1 0.0.0.0
[ASBR-PE2]ospf 1
[ASBR-PE2-ospf-1]area 0
[ASBR-PE2-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0
[ASBR-PE2-ospf-1-area-0.0.0.0]network 30.1.1.0 0.0.0.255
[ASBR-PE2-ospf-1-area-0.0.0.0]network 12.1.1.0 0.0.0.255
[PE1]ospf 1
[PE1-ospf-1]area 0
[PE1-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0
[PE1-ospf-1-area-0.0.0.0]network 20.1.1.0 0.0.0.255
[PE2]ospf 1
[PE2-ospf-1]area 0
[PE2-ospf-1-area-0.0.0.0]network 4.4.4.4 0.0.0.0
[PE2-ospf-1-area-0.0.0.0]network 30.1.1.0 0.0.0.255
3. 在AS100和AS200的MPLS骨干网上分别配置MPLS基本能力和MPLS LDP，建立LDP LSP
[ASBR-PE1]mpls lsr-id 1.1.1.1
[ASBR-PE1]mpls
[ASBR-PE1-mpls]label advertise non-null
[ASBR-PE1]mpls ldp
[ASBR-PE1-GigabitEthernet0/0/1]mpls
[ASBR-PE1-GigabitEthernet0/0/1]mpls ldp
[ASBR-PE2]mpls lsr-id 2.2.2.2
[ASBR-PE2]mpls
[ASBR-PE2-mpls]label advertise non-null
[ASBR-PE2]mpls ldp
[ASBR-PE2-GigabitEthernet0/0/1]mpls
[ASBR-PE2-GigabitEthernet0/0/1]mpls ldp
[PE1]mpls lsr-id 3.3.3.3
[PE1]mpls
[PE1-mpls]label advertise non-null
[PE1]mpls ldp
[PE1-GigabitEthernet0/0/0]mpls
[PE1-GigabitEthernet0/0/0]mpls ldp
[PE2]mpls lsr-id 4.4.4.4
[PE2]mpls
[PE2-mpls]label advertise non-null
[PE2]mpls ldp
[PE2-GigabitEthernet0/0/0]mpls
[PE2-GigabitEthernet0/0/0]mpls ldp
4. PE与ASBR-PE之间建立MP-IBGP对等体关系，交换VPN路由信息
[ASBR-PE1]bgp 100
[ASBR-PE1-bgp]peer 3.3.3.3 as-number 100
[ASBR-PE1-bgp]peer 3.3.3.3 connect-interface LoopBack 0
[ASBR-PE1-bgp]ipv4-family vpnv4
[ASBR-PE1-bgp-af-vpnv4]peer 3.3.3.3 enable
[PE1]bgp 100
[PE1-bgp]peer 1.1.1.1 as-number 100
[PE1-bgp]peer 1.1.1.1 connect-interface LoopBack 0
[PE1-bgp]ipv4-family vpnv4
[PE1-bgp-af-vpnv4]peer 1.1.1.1 enable
[ASBR-PE2]bgp 200
[ASBR-PE2-bgp]peer 4.4.4.4 as-number 200
[ASBR-PE2-bgp]peer 4.4.4.4 connect-interface LoopBack 0
[ASBR-PE2-bgp]ipv4-family vpnv4
[ASBR-PE2-bgp-af-vpnv4]peer 4.4.4.4 enable
[PE2]bgp 200
[PE2-bgp]peer 2.2.2.2 as-number 200
[PE2-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[PE2-bgp]ipv4-family vpnv4
[PE2-bgp-af-vpnv4]peer 2.2.2.2 enable
5. 在PE设备上配置使能IPv4地址族的VPN实例，将CE接入PE
[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 both
[PE1-GigabitEthernet0/0/1]ip binding vpn-instance vpn1
[PE1-GigabitEthernet0/0/1]ip add 10.1.1.3 24
[PE2]ip vpn-instance vpn1
[PE2-vpn-instance-vpn1]ipv4-family
[PE2-vpn-instance-vpn1-af-ipv4]route-distinguisher 200:1
[PE2-vpn-instance-vpn1-af-ipv4]vpn-target 2:2 both
[PE2-GigabitEthernet0/0/1]ip binding vpn-instance vpn1
[PE2-GigabitEthernet0/0/1]ip add 10.2.1.4 24
6. 配置PE与CE建立EBGP对等体关系，交换VPN路由
[CE1]bgp 65001
[CE1-bgp]peer 10.1.1.3 as-number 100
[CE1-bgp]import-route direct
[PE1]bgp 100
[PE1-bgp]ipv4-family vpn-instance vpn1
[PE1-bgp]peer 10.1.1.5 as-number 65001
[PE1-bgp]import-route direct
[CE2]bgp 65002
[CE2-bgp]peer 10.2.1.4 as-number 200
[CE2-bgp]import-route direct
[PE2]bgp 200
[PE2-bgp]ipv4-family vpn-instance vpn1
[PE2-bgp-vpn1]peer 10.2.1.6 as-number 65002
[PE2-bgp-vpn1]import-route direct
7. 配置OptionA方式的跨域VPN
[ASBR-PE1]ip vpn-instance vpn1
[ASBR-PE1-vpn-instance-vpn1]ipv4-family
[ASBR-PE1-vpn-instance-vpn1-af-ipv4]route-distinguisher 100:2
[ASBR-PE1-vpn-instance-vpn1-af-ipv4]vpn-target 1:1 both
[ASBR-PE1-GigabitEthernet0/0/0]ip binding vpn-instance vpn1
[ASBR-PE1-GigabitEthernet0/0/0]ip add 12.1.1.1 24
[ASBR-PE2]ip vpn-instance vpn1
[ASBR-PE2-vpn-instance-vpn1]ipv4-family
[ASBR-PE2-vpn-instance-vpn1-af-ipv4]route-distinguisher 200:2
[ASBR-PE2-vpn-instance-vpn1-af-ipv4]vpn-target 2:2
[ASBR-PE2-GigabitEthernet0/0/0]ip binding vpn-instance vpn1
[ASBR-PE2-GigabitEthernet0/0/0]ip add 12.1.1.2 24
[ASBR-PE1]bgp 100
[ASBR-PE1-bgp]ipv4-family vpn-instance vpn1
[ASBR-PE1-bgp-vpn1]peer 12.1.1.2 as-number 200
[ASBR-PE1-bgp-vpn1]import-route direct
[ASBR-PE2]bgp 200
[ASBR-PE2-bgp]ipv4-family vpn-instance vpn1
[ASBR-PE2-bgp-vpn1]peer 12.1.1.1 as-number 100
[ASBR-PE2-bgp-vpn1]import-route direct
8. 检查配置
