华为设备配置BGP/MPLS IP 虚拟专用网地址空间重叠

1.配置IP地址
[PE1-LoopBack0]ip add 1.1.1.1 32
[PE1-GigabitEthernet0/0/0]ip add 20.1.1.1 24
[P-LoopBack0]ip add 2.2.2.2 32
[P-GigabitEthernet0/0/0]ip add 20.1.1.2 24
[P-GigabitEthernet0/0/1]ip add 30.1.1.2 24
[PE2-LoopBack0]ip add 3.3.3.3 32
[PE2-GigabitEthernet0/0/0]ip add 30.1.1.3 24
[CE1-GigabitEthernet0/0/0]ip add 10.1.1.10 24
[CE2-GigabitEthernet0/0/0]ip add 10.1.1.10 24
[CE3-GigabitEthernet0/0/0]ip add 10.3.1.30 24
[CE4-GigabitEthernet0/0/0]ip add 10.3.1.30 24
2.在PE1、P、PE2配置OSPF协议
[PE1]ospf 1
[PE1-ospf-1]area 0
[PE1-ospf-1-area-0.0.0.0]network 20.1.1.0 0.0.0.255
[PE1-ospf-1-area-0.0.0.0]network 1.1.1.1 0.0.0.0
[P]ospf 1
[P-ospf-1]area 0
[P-ospf-1-area-0.0.0.0]network 20.1.1.0 0.0.0.255
[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 2.2.2.2 0.0.0.0
[PE2]ospf 1
[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
3. 在PE1、P、PE2配置MPLS基本能力和MPLS LDP，建立LDP LSP
[PE1]mpls lsr-id 1.1.1.1
[PE1]mpls
[PE1]mpls ldp
[PE1-GigabitEthernet0/0/0]mpls
[PE1-GigabitEthernet0/0/0]mpls ldp
[P]mpls lsr-id 2.2.2.2
[P]mpls
[P]mpls ldp
[P-GigabitEthernet0/0/0]mpls
[P-GigabitEthernet0/0/0]mpls ldp
[P-GigabitEthernet0/0/1]mpls
[P-GigabitEthernet0/0/1]mpls ldp
[PE2]mpls lsr-id 3.3.3.3
[PE2]mpls
[PE2]mpls ldp
[PE2-GigabitEthernet0/0/0]mpls
[PE2-GigabitEthernet0/0/0]mpls ldp

4. 在PE设备上配置VPN实例，将CE接入PE
   [PE1]ip vpn-instance vpna
   [PE1-vpn-instance-vpna]ipv4-family
   [PE1-vpn-instance-vpna-af-ipv4]route-distinguisher 100:100
   [PE1-vpn-instance-vpna-af-ipv4]vpn-target 100:100 export-extcommunity
   [PE1-vpn-instance-vpna-af-ipv4]vpn-target 100:100 import-extcommunity
   [PE1]ip vpn-instance vpnb
   [PE1-vpn-instance-vpnb]ipv4-family
   [PE1-vpn-instance-vpnb-af-ipv4]route-distinguisher 300:300
   [PE1-vpn-instance-vpnb-af-ipv4]vpn-target 200:200 export-extcommunity
   [PE1-vpn-instance-vpnb-af-ipv4]vpn-target 200:200 import-extcommunity
   [PE1-GigabitEthernet0/0/1]ip binding vpn-instance vpna
   [PE1-GigabitEthernet0/0/1]ip add 10.1.1.10 24
   [PE1-GigabitEthernet0/0/2]ip binding vpn-instance vpnb
   [PE1-GigabitEthernet0/0/2]ip add 10.1.1.10 24
   [PE2]ip vpn-instance vpna
   [PE2-vpn-instance-vpna]ipv4-family
   [PE2-vpn-instance-vpna-af-ipv4]route-distinguisher 200:200
   [PE2-vpn-instance-vpna-af-ipv4]vpn-target 100:100 both
   [PE2]ip vpn-instance vpnb
   [PE2-vpn-instance-vpnb]ipv4-family
   [PE2-vpn-instance-vpnb-af-ipv4]route-distinguisher 400:400
   [PE2-vpn-instance-vpnb-af-ipv4]vpn-target 200:200 both [PE2-GigabitEthernet0/0/1]ip binding vpn-instance vpna
   [PE2-GigabitEthernet0/0/1]ip add 10.3.1.30 24
   [PE2-GigabitEthernet0/0/2]ip binding vpn-instance vpnb
   [PE2-GigabitEthernet0/0/2]ip add 10.3.1.30 24
   
   

5. 在PE之间建立MP-IBGP对等体关系
   [PE1]bgp 100
   [PE1-bgp]peer 3.3.3.3 as-number 100
   [PE1-bgp]peer 3.3.3.3 connect-interface LoopBack 0
   [PE1-bgp]ipv4-family vpnv4
   [PE1-bgp-af-vpnv4]peer 3.3.3.3 enable
   [PE1-bgp]ipv4-family vpn-instance vpna
   [PE1-bgp-vpna]import-route direct
   [PE1-bgp]ipv4-family vpn-instance vpnb
   [PE1-bgp-vpnb]import-route direct
   [PE2]bgp 100
   [PE2-bgp]peer 1.1.1.1 as-number 100
   [PE2-bgp]peer 1.1.1.1 connect-interface LoopBack 0
   [PE2-bgp]ipv4-family vpnv4
   [PE2-bgp-af-vpnv4]peer 1.1.1.1 enable
   [PE2-bgp]ipv4-family vpn-instance vpna
   [PE2-bgp-vpna]import-route direct
   [PE2-bgp]ipv4-family vpn-instance vpnb
   [PE2-bgp-vpnb]import-route direct

6. 在CE1、CE2、CE3、CE4设备上配置到各自连接PE的静态路由
   [CE1]ip route-static 0.0.0.0 0.0.0.0 10.1.1.1
   [CE2]ip route-static 0.0.0.0 0.0.0.0 10.1.1.1
   [CE3]ip route-static 0.0.0.0 0.0.0.0 30.1.1.3
   [CE4]ip route-static 0.0.0.0 0.0.0.0 30.1.1.3

7. 检查配置