BGP has a simple loop prevention mechanism for external BGP. When you see your own Autonomous system number in the AS path, we do not accept the prefix. This mechanism is fine for Internet routing but there are some other scenarios where this might be an issue.
In our topology, no routes get installed because the CE routers receive the routes with their own AS coming from other sites. (5500). So as per BGP, it will not install the routes in the BGP table. It's simple if the customer has the same ASN at different sites, the CE routers drop the BGP routes.
The CE routers drop the BGP update as it seems that it's own
ASN 5500 is in the update. This behavior is the default behavior of BGP and is a
prevention mechanism against loops in BGP
However, we have an easier solution is available and it involves having the PE router replace the customer ASN in the AS path with the ASN of the service provider. The command that you need to configure on the PE router to override the ASN is neighbor-address as-override.
1. 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?
Let's see the configuration:-
Topology:
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 Routing between PE and CE using EBGP on the both ends.
- Configure AS- 6123 for SP core , AS 5500 for both the customer sites
- ensure that PE routers(R1,and R3) should be able to ping CE routers (R4 and R5) LAN interfaces receptively
- .configure VPNv4 peering between Router1 and Router 3
- configure AS-OVERRIDE on Router 1 and Router 3
- make sure router install the routes in BGP table....
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
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
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
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
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
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
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
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#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
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
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
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
R4(config)#router bgp 5500
R4(config-router)#neighbor 30.1.1.1 remote-as 6123
R4(config-router)#network 192.168.40.0 mask 255.255.255.0
R4(config-router)#network 30.0.0.0 mask 255.0.0.0
R4(config-router)#no auto-summary
R4(config-router)#no synchronization
R4(config-router)#exit
R5(config)#router bgp 5500
R5(config-router)#neighbor 10.1.1.1 remote-as 6123
R5(config-router)#no auto-summary
R5(config-router)#no synchronization
R5(config-router)#network 192.168.50.1 mask 255.255.255.255
R5(config-router)#network 10.0.0.0 mask 255.0.0.0
R5(config-router)#network 192.168.50.0 mask 255.255.255.0
R5(config-router)#exit
R3#show ip bgp vpnv4 all summary
BGP router identifier 192.168.33.1, local AS number 6123
BGP table version is 8, main routing table version 8
4 network entries using 624 bytes of memory
5 path entries using 400 bytes of memory
5/4 BGP path/bestpath attribute entries using 720 bytes of memory
1 BGP AS-PATH entries using 24 bytes of memory
1 BGP extended community entries using 24 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 1792 total bytes of memory
BGP activity 4/0 prefixes, 5/0 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
30.1.1.2 4 5500 89 89 8 0 0 01:16:41 2
192.168.10.1 4 6123 79 79 8 0 0 01:07:23 2
R3#show ip bgp vpnv4 all
BGP table version is 8, 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 i
*> 30.0.0.0 0.0.0.0 0 32768 ?
* 30.1.1.2 0 0 5500 i
*> 192.168.40.0 30.1.1.2 0 0 5500 i
*>i 192.168.50.0 192.168.10.1 0 100 0 5500 i
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, 01:08:49
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
B 192.168.40.0/24 [20/0] via 30.1.1.2, 01:18:07
B 192.168.50.0/24 [200/0] via 192.168.10.1, 01:08:49
R1#show ip bgp vpnv4 all summary
BGP router identifier 192.168.13.1, local AS number 6123
BGP table version is 7, main routing table version 7
4 network entries using 624 bytes of memory
5 path entries using 400 bytes of memory
5/4 BGP path/bestpath attribute entries using 720 bytes of memory
1 BGP AS-PATH entries using 24 bytes of memory
1 BGP extended community entries using 24 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 1792 total bytes of memory
BGP activity 4/0 prefixes, 5/0 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
10.1.1.2 4 5500 101 104 7 0 0 01:27:49 2
192.168.30.1 4 6123 82 82 7 0 0 01:09:36 2
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 10.1.1.2 0 0 5500 i
*> 0.0.0.0 0 32768 i
*>i 30.0.0.0 192.168.30.1 0 100 0 ?
*>i 192.168.40.0 192.168.30.1 0 100 0 5500 i
*> 192.168.50.0 10.1.1.2 0 0 5500 i
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, 01:10:29
B 192.168.40.0/24 [200/0] via 192.168.30.1, 01:10:29
B 192.168.50.0/24 [20/0] via 10.1.1.2, 01:28:42
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 = 124/151/208 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 = 40/65/84 ms
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 10.1.1.2 0 0 5500 i
*> 0.0.0.0 0 32768 i
*>i 30.0.0.0 192.168.30.1 0 100 0 ?
*>i 192.168.40.0 192.168.30.1 0 100 0 5500 i
*> 192.168.50.0 10.1.1.2 0 0 5500 i
R1#show ip bgp VPNV4 ALL SUmmary
BGP router identifier 192.168.13.1, local AS number 6123
BGP table version is 7, main routing table version 7
4 network entries using 624 bytes of memory
5 path entries using 400 bytes of memory
5/4 BGP path/bestpath attribute entries using 720 bytes of memory
1 BGP AS-PATH entries using 24 bytes of memory
1 BGP extended community entries using 24 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 1792 total bytes of memory
BGP activity 4/0 prefixes, 5/0 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
10.1.1.2 4 5500 104 107 7 0 0 01:30:43 2
192.168.30.1 4 6123 85 85 7 0 0 01:12:31 2
R5#SHOW IP ROUTE
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 10.1.1.2/32 is directly connected, FastEthernet0/0
B 30.0.0.0/8 [20/0] via 10.1.1.1, 01:13:19
192.168.50.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.50.0/24 is directly connected, Loopback0
L 192.168.50.1/32 is directly connected, Loopback0
(from the above we see 192.168.40.1 network is not install in router 5 because of loop prevention )
(from the above we see 192.168.40.1 network is not install in router 5 because of loop prevention )
R1(config)#router bgp 6123
R1(config-router)#address-family ipv4 vrf A-1
R1(config-router-af)#neighbor 10.1.1.2 as-override
R1(config-router-af)#exit
R3(config)#router bgp 6123
R3(config-router)#address-family ipv4 vrf A-2
R3(config-router-af)#neighbor 30.1.1.2 as-override
R3(config-router-af)#exit
R5#SHOW IP ROUTE
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 10.1.1.2/32 is directly connected, FastEthernet0/0
B 30.0.0.0/8 [20/0] via 10.1.1.1, 01:16:48
B 192.168.40.0/24 [20/0] via 10.1.1.1, 00:01:27
192.168.50.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.50.0/24 is directly connected, Loopback0
L 192.168.50.1/32 is directly connected, Loopback0
R4#show ip route
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 [20/0] via 30.1.1.1, 01:17:11
30.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 30.0.0.0/8 is directly connected, FastEthernet0/0
L 30.1.1.2/32 is directly connected, FastEthernet0/0
192.168.40.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.40.0/24 is directly connected, Loopback0
L 192.168.40.1/32 is directly connected, Loopback0
B 192.168.50.0/24 [20/0] via 30.1.1.1, 00:00:26
(after configuring OVERRIDE router 4 and 5 successfully installed routes in their table)
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