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  • about-us

    • What is OSPF Sham Links? how to configure OSPF Sham Links?

    OSPF Sham Links are required when we try to use a backdoor link between two CE routers in MPLS VPN PE CE scenarios.What is OSPF sham link ? OSPF Sham links is a logical inter-area link carried by the super backbone. A Sham links is required only between two VPN sites that belong to the same area and have a backdoor link for backup purposes. OSPF adjacency is established across the sham link. what is BGP ? what is BGP ? what is EIGRP? what is RIPv2? what is MPLS? what is MPLS LDP ? what is MPLS L3 VPN? How to configure MPLS L3 VPN with RIPv2 ? How to configure MPLS L3 VPN with EIGRP ?



    OSPF Sham Links are required when we try to use a backdoor link between two CE routers in MPLS VPN PE CE scenarios.





















    What is OSPF sham link ?
    OSPF Sham links is a logical inter-area link carried by the super backbone. A Sham links is required only between two VPN sites that belong to the same area and have a backdoor link for backup purposes. OSPF adjacency is established across the sham link.  





    lets see the configuration for better understanding:-

    Topology:-
    OSPF Sham Links are required when we try to use a backdoor link between two CE routers in MPLS VPN PE CE scenarios.

    Goal:

    • configure the topology as per the diagram 
    • assign the IP addresses to their interfaces
    • configure IGP (OSPF 1) inside MPLS SP core 
    • configure MPLS LDP on router 1_2_3 
    • configure labels (99-199_200-299_300-399)
    • configure VRF A-1 on router 1 and VRF A-2 on router 3
    • configure RD and RT  value 500:1 on both the sites
    • configure on router 1 assign fastethernet facing CE under VRF A-1
    • configure on router 3 assign fastethernet facing CE under VRF A-2
    • Configure the loopbacks with exact mask to exchange the routes 
    • configure OSPF 1 on both CE routers  
    • configure OSPF 11 on PE router 1 under VRF A-1 and OSPF 13 on PE router 3 under VRF A-2
    •  make sure PE and CE routers can ping 



    • configure VPNv4 peering between PE routers. 
    • Configure redistribution on PE routers between OSPF and BGP under VRF.
    • make sure both the  CEs routers able to ping.
    • Configure one serial link (backup link /backdoor) between router 4/5.
    • Configure router1 and router 3 in area 0 to ensure that OSPF routes learned other end should prefer MPLS backbone. 



    R1(config)#Interface fastethernet 0/0
    R1(config-if)#Ip address 10.1.1.1   255.0.0.0
    R1(config-if)#No shutdown
    R1(config-if)# keepalive
    R1(config-if)#Exit


    R1(config)#Interface serial 4/0
    R1(config-if)#Ip address  1.1.1.1 255.0.0.0
    R1(config-if)#No shutdown
    R1(config-if)#Exit

    R1(config)#Interface serial 4/2
    R1(config-if)#Ip address  3.3.3.2 255.0.0.0
    R1(config-if)#No shutdown
    R1(config-if)#Exit

    R1(config)#Interface loopback 0
    R1(config-if)#Ip address 192.168.10.1 255.255.255.0
    R1(config-if)#Exit

    R1(config)#Interface loopback  1
    R1(config-if)#Ip address 192.168.11.1 255.255.255.0
    R1(config-if)#Exit
    R1(config)#Interface loopback  2
    R1(config-if)#Ip address 192.168.12.1 255.255.255.0
    R1(config-if)#Exit
    R1(config)#Interface loopback 3
    R1(config-if)#Ip address 192.168.13.1  255.255.255.0
    R1(config-if)#Exit

    R2(config)#Interface fastethernet 0/0
    R2(config-if)#Ip address 20.1.1.1   255.0.0.0
    R2(config-if)#No shutdown
    R2(config-if)#keepalive
    R2(config-if)#Exit
    R2(config)#Interface serial 4/0
    R2(config-if)#Ip address  1.1.1.2 255.0.0.0
    R2(config-if)#No shutdown
    R2(config-if)#Exit

    R2(config)#Interface serial 4/1
    R2(config-if)#Ip address  2.2.2.1 255.0.0.0
    R2(config-if)#No shutdown
    R2(config-if)#Exit

    R2(config)#Interface loopback 0
    R2(config-if)#Ip address 192.168.20.1 255.255.255.0
    R2(config-if)#Exit
    R2(config)#Interface loopback  1
    R2(config-if)#Ip address 192.168.21.1 255.255.255.0
    R2(config-if)#Exit
    R2(config)#Interface loopback  2
    R2(config-if)#Ip address 192.168.22.1 255.255.255.0
    R2(config-if)#Exit
    R2(config)#Interface loopback 3
    R2(config-if)#Ip address 192.168.23.1  255.255

    R3(config)#Interface fastethernet 0/0
    R3(config-if)#Ip address 30.1.1.1   255.0.0.0
    R3(config-if)#No shutdown
    R3(config-if)# keepalive
    R3(config-if)#Exit


    R3(config)#Interface serial 4/1
    R3(config-if)#Ip address  2.2.2.2 255.0.0.0
    R3(config-if)#No shutdown
    R3(config-if)#Exit
    R3(config)#Interface serial 4/2
    R3(config-if)#Ip address  3.3.3.1 255.0.0.0
    R3(config-if)#No shutdown
    R3(config-if)#Exit

    R3(config)#Interface loopback 0
    R3(config-if)#Ip address 192.168.30.1 255.255.255.0
    R3(config-if)#Exit
    R3(config)#
    R3(config)#Interface loopback  1
    R3(config-if)#Ip address 192.168.31.1 255.255.255.0
    R3(config-if)#Exit
    R3(config)#Interface loopback  2
    R3(config-if)#Ip address 192.168.32.1 255.255.255.0
    R3(config-if)#Exit
    R3(config)#Interface loopback 3
    R3(config-if)#Ip address 192.168.33.1  255.255.
    R3(config-if)#Exit

    R4(config)#interface fastEthernet 0/0
    R4(config-if)#ip address 30.1.1.2 255.0.0.0
    R4(config-if)#no shutdown
    R4(config-if)#exit

    R4(config)#interface loopback 0
    R4(config-if)#ip address 192.168.40.1 255.255.255.0
    R4(config-if)#exit

    R5(config)#Interface fastethernet 0/0
    R5(config-if)#Ip address 10.1.1.2   255.0.0.0
    R5(config-if)#shutdown
    R5(config-if)#Exit

    R5(config)#Interface loopback 0
    R5(config-if)#Ip address 192.168.50.1  255.255.255.0
    R5(config-if)#Exit


    R1#show ip interface brief
    Interface              IP-Address      OK? Method Status                Protocol
    FastEthernet0/0        10.1.1.1        YES manual up                    up

    Serial4/0              1.1.1.1         YES manual up                    up

    Serial4/2              3.3.3.2         YES manual up                    up
    Loopback0              192.168.10.1    YES manual up                    up
    Loopback1              192.168.11.1    YES manual up                    up
    Loopback2              192.168.12.1    YES manual up                    up
    Loopback3              192.168.13.1    YES manual up                    up
    R2#show ip interface brief
    Interface              IP-Address      OK? Method Status                Protocol
    FastEthernet0/0        20.1.1.1        YES manual up                    up
    Serial4/0              1.1.1.2         YES manual up                    up
    Serial4/1              2.2.2.1         YES manual up                    up
    Loopback0              192.168.20.1    YES manual up                    up
    Loopback1              192.168.21.1    YES manual up                    up
    Loopback2              192.168.22.1    YES manual up                    up
    Loopback3              192.168.23.1    YES manual up                    up

    R3#show ip interface brief
    Interface              IP-Address      OK? Method Status                Protocol
    FastEthernet0/0        30.1.1.1        YES manual up                    up
    Serial4/1              2.2.2.2         YES manual up                    up
    Serial4/2              3.3.3.1         YES manual up                    up
    Loopback0              192.168.30.1    YES manual up                    up
    Loopback1              192.168.31.1    YES manual up                    up
    Loopback2              192.168.32.1    YES manual up                    up
    Loopback3              192.168.33.1    YES manual up                    up


    R4#show ip interface brief
    Interface              IP-Address      OK? Method Status                Protocol
    FastEthernet0/0        30.1.1.2        YES manual up                    up
    Loopback0              192.168.40.1    YES manual up                    up


    R5#show ip interface  brief
    Interface              IP-Address      OK? Method Status                Protocol
    FastEthernet0/0        10.1.1.2        YES manual up                    up
    Loopback0              192.168.50.1    YES manual up                    up

    R1(config)#router ospf 1
    R1(config-router)#network 1.0.0.0 0.255.255.255 area 0
    R1(config-router)#network 3.0.0.0 0.255.255.255 area 0
    R1(config-router)#network 192.168.10.0 255.0.0.0 area 0
    R1(config-router)#network 192.168.11.0 255.0.0.0 area 0
    R1(config-router)#network 192.168.12.0 255.0.0.0 area 0
    R1(config-router)#network 192.168.13.0 255.0.0.0 area 0
    R1(config-router)#end

    R2(config)#router ospf 1
    R2(config-router)#network 20.0.0.0 0.255.255.255 area 0
    R2(config-router)#network 1.0.0.0 0.255.255.255 area 0
    R2(config-router)#network 2.0.0.0 0.255.255.255 area 0
    R2(config-router)#network 192.168.20.0 255.0.0.0 area 0
    R2(config-router)#network 192.168.21.0 255.0.0.0 area 0
    R2(config-router)#network 192.168.22.0 255.0.0.0 area 0
    R2(config-router)#network 192.168.23.0 255.0.0.0 area 0
    R2(config-router)#end

    R3(config)#router ospf 1
    R3(config-router)#network 2.0.0.0 0.255.255.255 area 0
    R3(config-router)#network 3.0.0.0 0.255.255.255 area 0
    R3(config-router)#network 192.168.30.0 255.0.0.0 area 0
    R3(config-router)#network 192.168.31.0 255.0.0.0 area 0
    R3(config-router)#network 192.168.32.0 255.0.0.0 area 0
    R3(config-router)#network 192.168.33.0 255.0.0.0 area 0
    R3(config-router)#end


    R1#show ip route ospf
    Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
           D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
           N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
           E1 - OSPF external type 1, E2 - OSPF external type 2
           i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
           ia - IS-IS inter area, * - candidate default, U - per-user static route
           o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
           + - replicated route, % - next hop override
    Gateway of last resort is not set

    O     2.0.0.0/8 [110/128] via 3.3.3.1, 01:14:38, Serial4/2
                    [110/128] via 1.1.1.2, 01:14:38, Serial4/0
    O     20.0.0.0/8 [110/65] via 1.1.1.2, 01:14:38, Serial4/0
          192.168.20.0/32 is subnetted, 1 subnets
    O        192.168.20.1 [110/65] via 1.1.1.2, 01:14:38, Serial4/0
          192.168.21.0/32 is subnetted, 1 subnets
    O        192.168.21.1 [110/65] via 1.1.1.2, 01:14:38, Serial4/0
          192.168.22.0/32 is subnetted, 1 subnets
    O        192.168.22.1 [110/65] via 1.1.1.2, 01:14:38, Serial4/0
          192.168.23.0/32 is subnetted, 1 subnets
    O        192.168.23.1 [110/65] via 1.1.1.2, 01:14:38, Serial4/0
    O     192.168.30.0/24 [110/65] via 3.3.3.1, 01:14:38, Serial4/2
          192.168.31.0/32 is subnetted, 1 subnets
    O        192.168.31.1 [110/65] via 3.3.3.1, 01:14:38, Serial4/2
          192.168.32.0/32 is subnetted, 1 subnets
    O        192.168.32.1 [110/65] via 3.3.3.1, 01:14:38, Serial4/2
          192.168.33.0/32 is subnetted, 1 subnets
    O        192.168.33.1 [110/65] via 3.3.3.1, 01:14:38, Serial4/2

    R3#show ip route ospf
    Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
           D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
           N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
           E1 - OSPF external type 1, E2 - OSPF external type 2
           i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
           ia - IS-IS inter area, * - candidate default, U - per-user static route
           o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
           + - replicated route, % - next hop override

    Gateway of last resort is not set

    O     1.0.0.0/8 [110/128] via 3.3.3.2, 01:18:05, Serial4/2
                    [110/128] via 2.2.2.1, 01:18:05, Serial4/1
    O     20.0.0.0/8 [110/65] via 2.2.2.1, 01:18:05, Serial4/1
    O     192.168.10.0/24 [110/65] via 3.3.3.2, 01:18:05, Serial4/2
          192.168.11.0/32 is subnetted, 1 subnets
    O        192.168.11.1 [110/65] via 3.3.3.2, 01:18:05, Serial4/2
          192.168.12.0/32 is subnetted, 1 subnets
    O        192.168.12.1 [110/65] via 3.3.3.2, 01:18:05, Serial4/2
          192.168.13.0/32 is subnetted, 1 subnets
    O        192.168.13.1 [110/65] via 3.3.3.2, 01:18:05, Serial4/2
          192.168.20.0/32 is subnetted, 1 subnets
    O        192.168.20.1 [110/65] via 2.2.2.1, 01:18:05, Serial4/1
          192.168.21.0/32 is subnetted, 1 subnets
    O        192.168.21.1 [110/65] via 2.2.2.1, 01:18:05, Serial4/1
          192.168.22.0/32 is subnetted, 1 subnets
    O        192.168.22.1 [110/65] via 2.2.2.1, 01:18:05, Serial4/1
          192.168.23.0/32 is subnetted, 1 subnets
    O        192.168.23.1 [110/65] via 2.2.2.1, 01:18:05, Serial4/1


    R1(config)#mpls label protocol ldp
    R1(config)#mpls label range 99 199
    R1(config)#mpls ldp router-id loopback 0
    R1(config)#exit

    R1(config)#interface serial 4/0
    R1(config-if)#mpls ip
    R1(config-if)#exit

    R1(config)#interface serial 4/2
    R1(config-if)#mpls ip
    R1(config-if)#exit

    R2(config)#mpls label protocol ldp
    R2(config)#mpls label range 200 299
    R2(config)#mpls ldp router-id loopback 0
    R2(config)#exit

    R2(config)#interface serial 4/0
    R2(config-if)#mpls ip
    R2(config-if)#exit

    R2(config)#interface serial 4/1
    R2(config-if)#mpls ip
    R2(config-if)#exit


    R3(config)#mpls label protocol ldp
    R3(config)#mpls label range 300 399
    R3(config)#mpls ldp router-id loopback 0
    R3(config)#exit

    R3(config)#interface serial 4/1
    R3(config-if)#mpls ip
    R3(config-if)#exit


    R3(config)#interface serial 4/2
    R3(config-if)#mpls ip
    R3(config-if)#exit

    R1#show mpls ldp neighbor
        Peer LDP Ident: 192.168.20.1:0; Local LDP Ident 192.168.10.1:0
            TCP connection: 192.168.20.1.41723 - 192.168.10.1.646
            State: Oper; Msgs sent/rcvd: 190/188; Downstream
            Up time: 02:23:12
            LDP discovery sources:
              Serial4/0, Src IP addr: 1.1.1.2
            Addresses bound to peer LDP Ident:
              20.1.1.1        1.1.1.2         2.2.2.1         192.168.20.1
              192.168.21.1    192.168.22.1    192.168.23.1
        Peer LDP Ident: 192.168.30.1:0; Local LDP Ident 192.168.10.1:0
            TCP connection: 192.168.30.1.27403 - 192.168.10.1.646
            State: Oper; Msgs sent/rcvd: 186/184; Downstream
            Up time: 02:20:31
            LDP discovery sources:
              Serial4/2, Src IP addr: 3.3.3.1
            Addresses bound to peer LDP Ident:
              2.2.2.2         3.3.3.1         192.168.30.1    192.168.31.1
              192.168.32.1    192.168.33.1


    R2#show mpls ldp neighbor
        Peer LDP Ident: 192.168.10.1:0; Local LDP Ident 192.168.20.1:0
            TCP connection: 192.168.10.1.646 - 192.168.20.1.41723
            State: Oper; Msgs sent/rcvd: 189/192; Downstream
            Up time: 02:24:22
            LDP discovery sources:
              Serial4/0, Src IP addr: 1.1.1.1
            Addresses bound to peer LDP Ident:
              1.1.1.1         3.3.3.2         192.168.10.1    192.168.11.1
              192.168.12.1    192.168.13.1
        Peer LDP Ident: 192.168.30.1:0; Local LDP Ident 192.168.20.1:0
            TCP connection: 192.168.30.1.64637 - 192.168.20.1.646
            State: Oper; Msgs sent/rcvd: 187/189; Downstream
            Up time: 02:22:00
            LDP discovery sources:
              Serial4/1, Src IP addr: 2.2.2.2
            Addresses bound to peer LDP Ident:
              2.2.2.2         3.3.3.1         192.168.30.1    192.168.31.1
              192.168.32.1    192.168.33.1

    R3#show mpls ldp neighbor
        Peer LDP Ident: 192.168.20.1:0; Local LDP Ident 192.168.30.1:0
            TCP connection: 192.168.20.1.646 - 192.168.30.1.64637
            State: Oper; Msgs sent/rcvd: 190/188; Downstream
            Up time: 02:22:52
            LDP discovery sources:
              Serial4/1, Src IP addr: 2.2.2.1
            Addresses bound to peer LDP Ident:
              20.1.1.1        1.1.1.2         2.2.2.1         192.168.20.1
              192.168.21.1    192.168.22.1    192.168.23.1
        Peer LDP Ident: 192.168.10.1:0; Local LDP Ident 192.168.30.1:0
            TCP connection: 192.168.10.1.646 - 192.168.30.1.27403
            State: Oper; Msgs sent/rcvd: 187/189; Downstream
            Up time: 02:22:33
            LDP discovery sources:
              Serial4/2, Src IP addr: 3.3.3.2
            Addresses bound to peer LDP Ident:
              1.1.1.1         3.3.3.2         192.168.10.1    192.168.11.1
              192.168.12.1    192.168.13.1

    R(config)#ip vrf A-1
    R1(config-vrf)#rd 500:1
    R1(config-vrf)#route-target import 500:1
    R1(config-vrf)#route-target export 500:1
    R1(config-vrf)#exit

    R3(config)#ip vrf A-2
    R3(config-vrf)#rd 500:1
    R3(config-vrf)#route-target both 500:1
    R3(config-vrf)#exit

    R1(config)#interface fastethernet 0/0
    R1(config-if)#ip vrf forwarding A-1

    % Interface FastEthernet0/0 IPv4 disabled and address(es) removed due to enabling VRF A-1


    R1(config-if)#ip address 10.1.1.1 255.0.0.0
    R1(config-if)#no shutdown
    R1(config-if)#exit

    R3(config)#interface fastethernet 0/0
    R3(config-if)#ip vrf forwarding A-2

    % Interface FastEthernet0/0 IPv4 disabled and address(es) removed due to enabling VRF A-2

    R3(config-if)#ip address 30.1.1.1 255.0.0.0
    R3(config-if)#exit

    R1#show run | section vrf
    ip vrf A-1
     rd 500:1
     route-target export 500:1
     route-target import 500:1
     ip vrf forwarding A-1

    R3#show run | section vrf
    ip vrf A-2
     rd 500:1
     route-target export 500:1
     route-target import 500:1
     ip vrf forwarding A-2

    R1(config)#interface loopback 0
    R1(config-if)# ip ospf network point-to-point
    R1(config-if)#end

    R3(config)#interface loopback 0
    R3(config-if)# ip ospf network point-to-point
    R3(config-if)#end

    R4(config)#router ospf 1
    R4(config-router)#network 192.168.40.0 255.0.0.0 area 0
    R4(config-router)#network 30.0.0.0 0.255.255.255 area 0
    R4(config-router)#end

    R1(config)#router ospf 11 vrf A-1
    R1(config-router)#network 10.0.0.0 0.255.255.255 area 0
    R1(config-router)#exit

    *Mar 20 00:18:20.379: %OSPF-5-ADJCHG: Process 11, Nbr 192.168.40.1 on FastEthernet0/0 from LOADING to FULL, Loading Done



    R1#show ip ospf 1 neighbor

    Neighbor ID     Pri   State           Dead Time   Address         Interface
    192.168.33.1      0   FULL/  -        00:00:33    3.3.3.1         Serial4/2
    192.168.23.1      0   FULL/  -        00:00:38    1.1.1.2         Serial4/0
    R1#show ip ospf 11 neighbor

    Neighbor ID     Pri   State           Dead Time   Address         Interface
    192.168.40.1      1   FULL/DR         00:00:33    10.1.1.2        FastEthernet0/0


    R1#show ip route vrf A-1 ospf


    Routing Table: A-1
    Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
           D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
           N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
           E1 - OSPF external type 1, E2 - OSPF external type 2
           i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
           ia - IS-IS inter area, * - candidate default, U - per-user static route
           o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
           + - replicated route, % - next hop override

    Gateway of last resort is not set

          192.168.40.0/32 is subnetted, 1 subnets
    O        192.168.40.1 [110/2] via 10.1.1.2, 00:01:43, FastEthernet0/0



    R1#ping vrf A-1 192.168.40.1
    Type escape sequence to abort.
    Sending 5, 100-byte ICMP Echos to 192.168.40.1, timeout is 2 seconds:
    !!!!!
    Success rate is 100 percent (5/5), round-trip min/avg/max = 4/46/100 ms



    R5(config)#router ospf 1
    R5(config-router)#network 192.168.50.0 255.0.0.0 area 0
    R5(config-router)#network 10.0.0.0 0.255.255.255 area 0
    R5(config-router)#end



    R3(config)#router ospf 13 vrf A-2
    R3(config-router)#network 30.0.0.0 0.255.255.255 area 0
    R3(config-router)#end

    *Mar 20 00:28:16.623: %OSPF-5-ADJCHG: Process 13, Nbr 192.168.50.1 on FastEthernet0/0 from LOADING to FULL, Loading Done

    R3#show ip ospf 13 neighbor

    Neighbor ID     Pri   State           Dead Time   Address         Interface
    192.168.50.1      1   FULL/DR         00:00:33    30.1.1.2        FastEthernet0/0


    R3#show ip route vrf A-2 ospf

    Routing Table: A-2
    Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
           D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
           N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
           E1 - OSPF external type 1, E2 - OSPF external type 2
           i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
           ia - IS-IS inter area, * - candidate default, U - per-user static route
           o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
           + - replicated route, % - next hop override

    Gateway of last resort is not set

          192.168.50.0/32 is subnetted, 1 subnets
    O        192.168.50.1 [110/2] via 30.1.1.2, 00:01:24, FastEthernet0/0


    R1(config)#router bgp 6123
    R1(config-router)#no bgp default ipv4-unicast
    R1(config-router)#neighbor 192.168.30.1 remote-as 6123
    R1(config-router)#neighbor 192.168.30.1 update-source loopback 0
    R1(config-router)#address-family vpnv4 unicast
    R1(config-router-af)#neighbor 192.168.30.1 activate
    R1(config-router-af)#neighbor 192.168.30.1 send-community extended
    R1(config-router-af)#neighbor 192.168.30.1 next-hop-self
    R1(config-router-af)#end


    R3(config)#router bgp 6123
    R3(config-router)#no bgp default ipv4-unicast
    R3(config-router)#neighbor 192.168.10.1 remote-as 6123
    R3(config-router)#neighbor 192.168.10.1 update-source loopback 0
    R3(config-router)#address-family vpnv4 unicast
    R3(config-router-af)#neighbor 192.168.10.1 activate
    R3(config-router-af)#neighbor 192.168.10.1 send-community extended
    R3(config-router-af)#neighbor 192.168.10.1 next-hop-self
    R3(config-router-af)#end

    *Mar 20 00:59:36.259: %BGP-5-ADJCHANGE: neighbor 192.168.10.1 Up



    R1(config)#router bgp 6123
    R1(config-router)#address-family ipv4 vrf A-1
    R1(config-router-af)#redistribute ospf 11 vrf A-1 match ?
      external       Redistribute OSPF external routes
      internal       Redistribute OSPF internal routes
      nssa-external  Redistribute OSPF NSSA external routes

    R1(config-router-af)#redistribute ospf 11 vrf A-1 match internal ?
      external       Redistribute OSPF external routes
      metric         Metric for redistributed routes
      nssa-external  Redistribute OSPF NSSA external routes
      route-map      Route map reference
      <cr>

    R1(config-router-af)#redistribute ospf 11 vrf A-1 match internal external ?
      1              Redistribute external type 1 routes
      2              Redistribute external type 2 routes
      metric         Metric for redistributed routes
      nssa-external  Redistribute OSPF NSSA external routes
      route-map      Route map reference
      <cr>

    R1(config-router-af)#$e ospf 11 vrf A-1 match internal external 1 external 2
    R1(config-router-af)#end



    R1(config)#router ospf 11 vrf A-1
    R1(config-router)#redistribute bgp 6123 subnets
    R1(config-router)#end


    R3(config)#router bgp 6123
    R3(config-router)#address-family ipv4 vrf A-2
    R3(config-router-af)#$e ospf 13 vrf A-2 match internal external 1 external 2
    R3(config-router-af)#end

    (R3(config-router-af)#redistribute ospf 13 vrf A-2 match internal external 1 external 2)


    R3(config)#router ospf 13 vrf A-2
    R3(config-router)#redistribute bgp 6123 subnets

    R3(config-router)#end



    R1#show ip bgp vpnv4 all
    BGP table version is 7, local router ID is 192.168.13.1
    Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
                  r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
                  x best-external, a additional-path, c RIB-compressed,
    Origin codes: i - IGP, e - EGP, ? - incomplete
    RPKI validation codes: V valid, I invalid, N Not found


         Network          Next Hop            Metric LocPrf Weight Path
    Route Distinguisher: 500:1 (default for vrf A-1)
     *>  10.0.0.0         0.0.0.0                  0         32768 ?
     *>i 30.0.0.0         192.168.30.1             0    100      0 ?
     *>  192.168.40.1/32  10.1.1.2                 2         32768 ?
     *>i 192.168.50.1/32  192.168.30.1             2    100      0 ?

    R1#show ip route vrf A-1


    Routing Table: A-1
    Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
           D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
           N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
           E1 - OSPF external type 1, E2 - OSPF external type 2
           i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
           ia - IS-IS inter area, * - candidate default, U - per-user static route
           o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
           + - replicated route, % - next hop override

    Gateway of last resort is not set

          10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
    C        10.0.0.0/8 is directly connected, FastEthernet0/0
    L        10.1.1.1/32 is directly connected, FastEthernet0/0
    B     30.0.0.0/8 [200/0] via 192.168.30.1, 00:05:57
          192.168.40.0/32 is subnetted, 1 subnets
    O        192.168.40.1 [110/2] via 10.1.1.2, 00:40:55, FastEthernet0/0
          192.168.50.0/32 is subnetted, 1 subnets
    B        192.168.50.1 [200/2] via 192.168.30.1, 00:05:57

    R1#show ip route vrf A-1 bgp

    Routing Table: A-1
    Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
           D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
           N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
           E1 - OSPF external type 1, E2 - OSPF external type 2
           i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
           ia - IS-IS inter area, * - candidate default, U - per-user static route
           o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
           + - replicated route, % - next hop override

    Gateway of last resort is not set

    B     30.0.0.0/8 [200/0] via 192.168.30.1, 00:06:24
          192.168.50.0/32 is subnetted, 1 subnets
    B        192.168.50.1 [200/2] via 192.168.30.1, 00:06:24

    R1#ping vrf A-1 192.168.40.1
    Type escape sequence to abort.
    Sending 5, 100-byte ICMP Echos to 192.168.40.1, timeout is 2 seconds:
    !!!!!
    Success rate is 100 percent (5/5), round-trip min/avg/max = 44/72/104 ms


    R1#ping vrf A-1 192.168.50.1
    Type escape sequence to abort.
    Sending 5, 100-byte ICMP Echos to 192.168.50.1, timeout is 2 seconds:
    !!!!!
    Success rate is 100 percent (5/5), round-trip min/avg/max = 104/144/248 ms


    R3#show ip bgp vpnv4 all
    BGP table version is 7, local router ID is 192.168.33.1
    Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
                  r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
                  x best-external, a additional-path, c RIB-compressed,
    Origin codes: i - IGP, e - EGP, ? - incomplete
    RPKI validation codes: V valid, I invalid, N Not found

         Network          Next Hop            Metric LocPrf Weight Path
    Route Distinguisher: 500:1 (default for vrf A-2)
     *>i 10.0.0.0         192.168.10.1             0    100      0 ?
     *>  30.0.0.0         0.0.0.0                  0         32768 ?
     *>i 192.168.40.1/32  192.168.10.1             2    100      0 ?
     *>  192.168.50.1/32  30.1.1.2                 2         32768 ?


    R3#show ip route vrf A-2

    Routing Table: A-2
    Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
           D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
           N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
           E1 - OSPF external type 1, E2 - OSPF external type 2
           i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
           ia - IS-IS inter area, * - candidate default, U - per-user static route
           o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
           + - replicated route, % - next hop override

    Gateway of last resort is not set

    B     10.0.0.0/8 [200/0] via 192.168.10.1, 00:14:56
          30.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
    C        30.0.0.0/8 is directly connected, FastEthernet0/0
    L        30.1.1.1/32 is directly connected, FastEthernet0/0
          192.168.40.0/32 is subnetted, 1 subnets
    B        192.168.40.1 [200/2] via 192.168.10.1, 00:14:56
          192.168.50.0/32 is subnetted, 1 subnets
    O        192.168.50.1 [110/2] via 30.1.1.2, 00:22:01, FastEthernet0/0

    R3#show ip route vrf A-2 BGP


    Routing Table: A-2
    Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
           D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
           N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
           E1 - OSPF external type 1, E2 - OSPF external type 2
           i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
           ia - IS-IS inter area, * - candidate default, U - per-user static route
           o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
           + - replicated route, % - next hop override

    Gateway of last resort is not set

    B     10.0.0.0/8 [200/0] via 192.168.10.1, 00:15:15
          192.168.40.0/32 is subnetted, 1 subnets
    B        192.168.40.1 [200/2] via 192.168.10.1, 00:15:15



    R3#ping vrf A-2 192.168.50.1
    Type escape sequence to abort.
    Sending 5, 100-byte ICMP Echos to 192.168.50.1, timeout is 2 seconds:
    !!!!!
    Success rate is 100 percent (5/5), round-trip min/avg/max = 44/76/132 ms

    R3#ping vrf A-2 192.168.40.1
    Type escape sequence to abort.
    Sending 5, 100-byte ICMP Echos to 192.168.40.1, timeout is 2 seconds:
    !!!!!
    Success rate is 100 percent (5/5), round-trip min/avg/max = 68/108/152 ms

    R4#ping 192.168.50.1 source 192.168.40.1
    Type escape sequence to abort.
    Sending 5, 100-byte ICMP Echos to 192.168.50.1, timeout is 2 seconds:
    Packet sent with a source address of 192.168.40.1
    !!!!!
    Success rate is 100 percent (5/5), round-trip min/avg/max = 156/186/228 ms


    R4#traceroute 192.168.50.1
    Type escape sequence to abort.
    Tracing the route to 192.168.50.1
    VRF info: (vrf in name/id, vrf out name/id)
      1 10.1.1.1 108 msec 56 msec 104 msec
      2 30.1.1.1 [MPLS: Label 308 Exp 0] 84 msec 104 msec 104 msec
      3 30.1.1.2 172 msec 148 msec 128 msec

    R5#ping 192.168.40.1 source 192.168.50.1
    Type escape sequence to abort.
    Sending 5, 100-byte ICMP Echos to 192.168.40.1, timeout is 2 seconds:
    Packet sent with a source address of 192.168.50.1
    !!!!!
    Success rate is 100 percent (5/5), round-trip min/avg/max = 140/156/180 ms

    R5#traceroute 192.168.40.1
    Type escape sequence to abort.
    Tracing the route to 192.168.40.1
    VRF info: (vrf in name/id, vrf out name/id)
      1 30.1.1.1 36 msec 76 msec 56 msec
      2 10.1.1.1 [MPLS: Label 104 Exp 0] 180 msec 168 msec 56 msec
      3 10.1.1.2 180 msec 172 msec 228 msec



    R4#show ip route ospf
    Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
           D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
           N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
           E1 - OSPF external type 1, E2 - OSPF external type 2
           i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
           ia - IS-IS inter area, * - candidate default, U - per-user static route
           o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
           + - replicated route, % - next hop override

    Gateway of last resort is not set

    O E2  30.0.0.0/8 [110/1] via 10.1.1.1, 00:15:14, FastEthernet0/0
          192.168.50.0/32 is subnetted, 1 subnets
    O E2     192.168.50.1 [110/2] via 10.1.1.1, 00:15:14, FastEthernet0/0


    R5#show ip route ospf
    Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
           D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
           N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
           E1 - OSPF external type 1, E2 - OSPF external type 2
           i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
           ia - IS-IS inter area, * - candidate default, U - per-user static route
           o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
           + - replicated route, % - next hop override

    Gateway of last resort is not set


    O E2  10.0.0.0/8 [110/1] via 30.1.1.1, 00:12:07, FastEthernet0/0
          192.168.40.0/32 is subnetted, 1 subnets
    O E2     192.168.40.1 [110/2] via 30.1.1.1, 00:12:07, FastEthernet0/0

    R1(config)#interface loopback 11




    R1(config-if)#ip vrf forwarding A-1

    R1(config-if)#ip address 111.5.5.5 255.255.255.255
    R1(config-if)#exit

    R1(config)#router bgp 6123
    R1(config-router)#address-family ipv4 vrf A-1
    R1(config-router-af)#network 111.5.5.5 mask 255.255.255.255
    R1(config-router-af)#exit

    R1(config)#router OSPF
    R1(config)#router ospf 11 vrf A-1
    R1(config-router)#area 0 sham-link 111.5.5.5 111.6.6.6
    R1(config-router)#exit

    *Aug 12 00:42:45.387: %OSPF-5-ADJCHG: Process 11, Nbr 30.1.1.1 on OSPF_SL0 from LOADING to FULL, Loading Done

    R3(config)#interface loopback 13
    R3(config-if)#ip vrf forwarding A-2
    R3(config-if)#ip address 111.6.6.6 255.255.255.255
    R3(config-if)#exit

    R3(config)#router bgp 6123
    R3(config-router)#address-family ipv4 vrf A-2
    R3(config-router-af)#network 111.6.6.6 mask 255.255.255.255
    R3(config-router-af)#exit

    R3(config-router)#exit

    R3(config)#router ospf 13 vrf A-2
    R3(config-router)#area 0 sham-link 111.6.6.6 111.5.5.5
    R3(config-router)#end

    *Aug 12 00:42:46.139: %OSPF-5-ADJCHG: Process 13, Nbr 10.1.1.1 on OSPF_SL0 from LOADING to FULL, Loading Done

    R1#show ip ospf neighbor

    Neighbor ID     Pri   State           Dead Time   Address         Interface
    192.168.23.1      0   FULL/  -        00:00:30    1.1.1.2         Serial4/0
    192.168.33.1      0   FULL/  -        00:00:32    3.3.3.1         Serial4/2
    30.1.1.1          0   FULL/  -           -        111.6.6.6       OSPF_SL0
    192.168.50.1      1   FULL/BDR        00:00:36    10.1.1.2        FastEthernet0/0


    R3#show ip ospf neighbor

    Neighbor ID     Pri   State           Dead Time   Address         Interface
    192.168.13.1      0   FULL/  -        00:00:31    3.3.3.2         Serial4/2
    192.168.23.1      0   FULL/  -        00:00:35    2.2.2.1         Serial4/1
    10.1.1.1          0   FULL/  -           -        111.5.5.5       OSPF_SL0
    192.168.40.1      1   FULL/BDR        00:00:38    30.1.1.2        FastEthernet0/0


    R1#show ip ospf sham-links
    Sham Link OSPF_SL0 to address 111.6.6.6 is up
    Area 0 source address 111.5.5.5
      Run as demand circuit
      DoNotAge LSA allowed. Cost of using 1 State POINT_TO_POINT,
      Timer intervals configured, Hello 10, Dead 40, Wait 40,
        Hello due in 00:00:09
        Adjacency State FULL (Hello suppressed)
        Index 2/2, retransmission queue length 0, number of retransmission 0
        First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
        Last retransmission scan length is 0, maximum is 0
        Last retransmission scan time is 0 msec, maximum is 0 msec



    R3#show ip ospf sham-links
    Sham Link OSPF_SL0 to address 111.5.5.5 is up
    Area 0 source address 111.6.6.6
      Run as demand circuit
      DoNotAge LSA allowed. Cost of using 1 State POINT_TO_POINT,
      Timer intervals configured, Hello 10, Dead 40, Wait 40,
        Hello due in 00:00:05
        Adjacency State FULL (Hello suppressed)
        Index 2/2, retransmission queue length 0, number of retransmission 0
        First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
        Last retransmission scan length is 0, maximum is 0
        Last retransmission scan time is 0 msec, maximum is 0 msec

    Internetworks

    Author & Editor

    I am CCIE Technical Instructor/Network consultant. i am having experience of ranging from operating and maintaining PCs and peripherals to network control programs for multi-faceted data communication networks in LAN,MAN, and WAN environments.

    August 12, 2020

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    About me

    I am a CCIE Technical Instructor/Network, consultant. I am having experience of ranging from operating and maintaining PCs and peripherals to network control programs for multi-faceted data communication networks in LAN, MAN, and WAN environments.

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