解题思路：
1.先配置公有IP地址，用ospf使公有区域相互可达，再到 R7 的0/0/0口上宣告一条缺省指向公有网络
2.在R345上启动 MPLS 协议
3.在R3与R5上建立 IBGP 邻居关系，然后分别在R3、R5上创建 VRF空间
R3、R5 与 R1、R6建立的VRF为一个空间 a
R3、R5 与 R2、R7建立的VRF为一个空间 b
4.到R1R6上写静态路由
5.在 R3R5 上分别进入到对应的 VRF空间内，写缺省，分别指向R1R6的环回地址，在R3R5俩台路由器的VPN域内都施行重发布协议
6.R27上分别以 RIP 和 OSPF 协议进行IP地址宣告，R27宣告时不用进入到VRF空间内就可以
7.R35上进入对应的 VRF空间内，使用相同的 IP 宣告协议，只宣告本地与私网之间连线的IP网，再到R35上进入VRF空间内，输入重发布协议
R1：
[r1]interface g0/0/0 [r1-GigabitEthernet0/0/0]ip add 192.168.2.1 24 [r1-GigabitEthernet0/0/0]int l0 [r1-LoopBack0]ip add 192.168.1.1 24 [r1]ip route-static 192.168.3.0 255.255.255.0 192.168.2.2 [r1]ip route-static 192.168.4.0 255.255.255.0 192.168.2.2
R2
[r2]ip vpn-instance a1 [r2-vpn-instance-a1]route-distinguisher 2:2 [r2-vpn-instance-a1-af-ipv4]vpn-target 2:2 export-extcommunity [r2-vpn-instance-a1-af-ipv4]vpn-target 2:2 import-extcommunity [r2]ip vpn-instance b1 [r2-vpn-instance-b1]ipv4-family [r2-vpn-instance-b1-af-ipv4]route-distinguisher 1:1 [r2-vpn-instance-b1-af-ipv4]vpn-target 1:1 export-extcommunity [r2-vpn-instance-b1-af-ipv4]vpn-target 1:1 import-extcommunity [r2]mpls lsr-id 2.2.2.2 [r2]mpls [r2]mpls ldp [r2-mpls-ldp]int g0/0/1 [r2-GigabitEthernet0/0/1]ip add 23.1.1.1 24 [r2-GigabitEthernet0/0/1]mpls [r2-GigabitEthernet0/0/1]mpls ldp [r2-GigabitEthernet0/0/1]int g0/0/0 [r2-GigabitEthernet0/0/0]ip binding vpn-instance b1 [r2-GigabitEthernet0/0/0]ip add 192.168.2.2 24 [r2-GigabitEthernet0/0/0]int g0/0/2 [r2-GigabitEthernet0/0/2]ip binding vpn-instance a1 [r2-GigabitEthernet0/0/2]ip add 192.168.2.2 24 [r2-GigabitEthernet0/0/2]int l0 [r2-LoopBack0]ip add 2.2.2.2 32 [r2]bgp 1 [r2-bgp]router-id 2.2.2.2 [r2-bgp]peer 4.4.4.4 as-number 1 [r2-bgp]peer 4.4.4.4 connect-interface LoopBack 0 [r2-bgp]ipv4-family unicast [r2-bgp-af-ipv4]undo synchronizatio [r2-bgp-af-ipv4]peer 4.4.4.4 enable [r2-bgp]ipv4-family vpnv4 [r2-bgp-af-vpnv4]policy vpn-target [r2-bgp-af-vpnv4]peer 4.4.4.4 enable [r2-bgp]ipv4-family vpn-instance a1 [r2-bgp-a1]import-route rip 1 [r2-bgp]ipv4-family vpn-instance b1 [r2-bgp-b1]import-route direct [r2-bgp-b1]import-route static [r2]ospf 1 router-id 2.2.2.2 [r2-ospf-1]area 0.0.0.0 [r2-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0 [r2-ospf-1-area-0.0.0.0]network 23.1.1.1 0.0.0.0 [r2]rip 1 vpn-instance a1 [r2-rip-1]undo summary [r2-rip-1]version 2 [r2-rip-1]network 192.168.2.0 [r2-rip-1]import-route bgp [r2]ip route-static vpn-instance b1 192.168.1.0 255.255.255.0 192.168.2.1
R3
[r3]mpls lsr-id 3.3.3.3 [r3]mpls ldp [r3-mpls-ldp]int g0/0/0 [r3-GigabitEthernet0/0/0]ip add 23.1.1.2 24 [r3-GigabitEthernet0/0/0]mpls [r3-GigabitEthernet0/0/0]mpls ldp [r3-GigabitEthernet0/0/0]int g0/0/1 [r3-GigabitEthernet0/0/1]ip add 34.1.1.1 24 [r3-GigabitEthernet0/0/1]mpls [r3-GigabitEthernet0/0/1]mpls ldp [r3-GigabitEthernet0/0/1]int l0 [r3-LoopBack0]ip add 3.3.3.3 32 [r3]ospf 1 router-id 3.3.3.3 [r3-ospf-1]area 0.0.0.0 [r3-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0 [r3-ospf-1-area-0.0.0.0]network 23.1.1.2 0.0.0.0 [r3-ospf-1-area-0.0.0.0]network 34.1.1.1 0.0.0.0
R4
[r4]ip vpn-instance a1 [r4-vpn-instance-a1]ipv4-family [r4-vpn-instance-a1-af-ipv4]route-distinguisher 2:2 [r4-vpn-instance-a1-af-ipv4]vpn-target 2:2 export-extcommunity [r4-vpn-instance-a1-af-ipv4]vpn-target 2:2 import-extcommunity [r4]ip vpn-instance b1 [r4-vpn-instance-b1]ipv4-family [r4-vpn-instance-b1-af-ipv4]route-distinguisher 1:1 [r4-vpn-instance-b1-af-ipv4]vpn-target 1:1 export-extcommunity [r4-vpn-instance-b1-af-ipv4]vpn-target 1:1 import-extcommunity [r4]mpls lsr-id 4.4.4.4 [r4]mpls [r4]mpls ldp [r4-mpls-ldp]int g0/0/0 [r4-GigabitEthernet0/0/0]ip add 34.1.1.2 24 [r4-GigabitEthernet0/0/0]mpls [r4-GigabitEthernet0/0/0]mpls ldp [r4-GigabitEthernet0/0/0]int g0/0/1 [r4-GigabitEthernet0/0/1]ip binding vpn-instance b1 [r4-GigabitEthernet0/0/1]ip add 192.168.3.2 24 [r4-GigabitEthernet0/0/1]int g0/0/2 [r4-GigabitEthernet0/0/2]ip binding vpn-instance a1 [r4-GigabitEthernet0/0/2]ip add 192.168.3.2 24 [r4-GigabitEthernet0/0/2]int g4/0/0 [r4-GigabitEthernet4/0/0]ip add 47.1.1.1 24 [r4]int l0 [r4-LoopBack0]ip add 4.4.4.4 32 [r4]bgp 1 [r4-bgp]router-id 4.4.4.4 [r4-bgp]peer 2.2.2.2 as-number 1 [r4-bgp]peer 2.2.2.2 connect-interface LoopBack 0 [r4-bgp]ipv4-family unicast [r4-bgp-af-ipv4]undo synchronization [r4-bgp-af-ipv4]peer 2.2.2.2 [r4-bgp-af-ipv4]peer 2.2.2.2 enable [r4-bgp]ipv4-family vpnv4 [r4-bgp-af-vpnv4]policy vpn-target [r4-bgp-af-vpnv4]peer 2.2.2.2 enabl [r4-bgp]ipv4-family vpn-instance a1 [r4-bgp-a1]import-route ospf 2 [r4-bgp]ipv4-family vpn-instance b1 [r4-bgp-b1]import-route direct [r4-bgp-b1]import-route static [r4]ospf 1 router-id 4.4.4.4 [r4-ospf-1]area 0.0.0.0 [r4-ospf-1-area-0.0.0.0]network 4.4.4.4 0.0.0.0 [r4-ospf-1-area-0.0.0.0]network 34.1.1.2 0.0.0.0 [r4]ospf 2 router-id 4.4.4.4 vpn-instance a1 [r4-ospf-2]import-route bgp [r4-ospf-2]area 0.0.0.0 [r4-ospf-2-area-0.0.0.0]network 192.168.3.2 0.0.0.0 [r4]ip route-static vpn-instance a1 192.168.4.0 255.255.255.0 192.168.3.1 [r4]ip route-static vpn-instance b1 192.168.4.0 255.255.255.0 192.168.3.1
R5
[r5]int g0/0/0 [r5-GigabitEthernet0/0/0]ip add 192.168.3.1 24 [r5-GigabitEthernet0/0/0]int l0 [r5-LoopBack0]ip add 192.168.4.1 24 [r5]ip route-static 192.168.1.0 255.255.255.0 192.168.3.2 [r5]ip route-static 192.168.2.0 255.255.255.0 192.168.3.2
R6
[r6]int g0/0/0 [r6-GigabitEthernet0/0/0]ip add 192.168.2.1 24 [r6-GigabitEthernet0/0/0]int l0 [r6-LoopBack0]ip add 192.168.1.1 24 [r6]rip 1 [r6-rip-1]undo summary [r6-rip-1]version 2 [r6-rip-1]network 192.168.1.0 [r6-rip-1]network 192.168.2.0
R7
[r7]int g0/0/0 [r7-GigabitEthernet0/0/0]ip add 192.168.3.1 24 [r7-GigabitEthernet0/0/0]int g0/0/1 [r7-GigabitEthernet0/0/1]ip add 47.1.1.2 24 [r7-GigabitEthernet0/0/1]int l0 [r7-LoopBack0]ip add 192.168.4.2 24 [r7]ospf 1 router-id 7.7.7.7 [r7-ospf-1]area 0.0.0.0 [r7-ospf-1-area-0.0.0.0]network 192.168.3.1 0.0.0.0 [r7-ospf-1-area-0.0.0.0]network 192.168.4.2 0.0.0.0 [r7]ip route-static 0.0.0.0 0.0.0.0 192.168.3.2
