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.
- Introduction of MPLS
2.What is MPLS Label distributing protocol (LDP) ? How LDP works?
3.how to configure MPLS LDP Peering ?
4.What is MPLS L3 VPN ? How to configure?
5.How to configure MPLS L3 VPN with RIPv2 ?
6.How to configure MPLS L3 VPN with EIGRP ?
7.How to configure MPLS L3 VPN with OSPF ?
8.What is OSPF Sham Links? how to configure OSPF Sham Links?
9.How to configure MPLS L3 with BGP AS OVERRIDE?
lets see the configuration for better understanding:-
Topology:-
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
