Topology
Here we have taken 7 nodes out of which 6 nodes are OSPF-SR enabled routers and node 7 will act as controller. R3 belong to autonomous-system-100 and R5 belong to autonomous-system-200. R1's xe3 and R3's xe3 belong to Area-1. R2, R4 and R3 belong to Area-0 . R5 and R6 belong to Area-0 . We shall configure OSPF-SR on every node. We shall give distribute-BGP-LS on R3 and R5, after that we will make an E- BGP session between R3 and Controller and R5 and controller. Under link-state link-state address family we will activate the neighbors. Verification will be done on ASBRS which are R3 and R5.
All NLRIs (Node, Link and Prefix) should display proper SR information of nodes belong to other AS.
Figure 3-5: BGP link state with OSPF segment routing
R1
R1#configure terminal | Entering to config mode |
R1(config)# hostname R1 | Configure hostname |
R1(config)#interface lo | Going to interface mode for loopback interface. |
R1(config-if)#ip address 1.1.1.1/32 secondary | Configure IPv4 address. |
R1(config-if)#prefix-sid absolute 18001 | Configure Prefix-sid absolute |
R1(config-if)#exit | Exit from interface mode. |
R1(config)#interface xe3 | Going to interface mode for xe3 interface. |
R1(config-if)#ip address 10.1.1.1/24 | Configure IPv4 address. |
R1(config-if)# label-switching | Configure Label-Switching. |
R1(config-if)#exit | Exit from interface mode. |
R1(config)# router ospf 100 | Entering router ospf. |
R1(config-router)# ospf router-id 1.1.1.1 | Configure OSPF router-id. |
R1(config-router)# network 1.1.1.1/32 area 0.0.0.1 | Configure network. |
R1(config-router)# network 10.1.1.0/24 area 0.0.0.1 | Configure network. |
R1(config-router)# segment-routing mpls | Configure segment-routing MPLS. |
R1(config-router)#exit | Exit from router-ospf mode. |
R2
R2#configure terminal | Entering to config mode |
R2(config)# hostname R2 | Configure hostname |
R2(config)#interface lo | Going to interface mode for loopback interface. |
R2(config-if)#ip address 2.2.2.2/32 secondary | Configure IPv4 address. |
R2(config-if)#prefix-sid absolute 18002 | Configure Prefix-sid |
R2(config-if)#exit | Exit from interface mode. |
R2(config)# interface xe1 | Going to interface mode for xe1 interface. |
R2(config-if)#ip address 11.1.1.1/24 | Configure IPv4 address. |
R2(config-if)# label-switching | Configure Label-Switching. |
R2(config-if)#exit | Exit from interface mode. |
R2(config)#router ospf 100 | Entering router ospf. |
R2(config-router)# ospf router-id 2.2.2.2 | Configure OSPF Router-id. |
R2(config-router)# network 2.2.2.2/32 area 0.0.0.0 | Configure Network. |
R2(config-router)# network 11.1.1.0/24 area 0.0.0.0 | Configure Network. |
R2(config-router)# segment-routing mpls | Configure segment-routing MPLS. |
R2(config-router)#exit | Exit from router-ospf mode. |
R3
R3#configure terminal | Entering to config mode |
R3(config)# hostname R3 | Configure hostname |
R3(config)#interface lo | Going to interface mode for loopback interface. |
R3(config-if)#ip address 3.3.3.3/32 secondary | Configure IPv4 address. |
R1(config-if)#prefix-sid absolute 18003 | Configure Prefix-sid |
R3(config-if)#exit | Exit from interface mode. |
R3(config)#interface xe3 | Going to interface mode for xe3 interface. |
R3(config-if)#ip address 10.1.1.2/24 | Configure IPv4 address. |
R3(config-if)# label-switching | Configure Label-Switching. |
R3(config-if)#exit | Exit from interface mode. |
R3(config)#interface xe1 | Going to interface mode for xe1 interface. |
R3(config-if)#ip address 11.1.1.2/24 | Configure IPv4 address. |
R3(config-if)# label-switching | Configure Label-Switching. |
R3(config-if)#exit | Exit from interface mode. |
R3(config)#interface xe8 | Going to interface mode for xe8 interface. |
R3(config-if)#ip address 12.1.1.2/24 | Configure IPv4 address. |
R3(config-if)# label-switching | Configure Label-Switching |
R3(config-if)#exit | Exit from interface mode. |
R3(config)#interface xe4 | Going to interface mode for xe4 interface. |
R3(config-if)#ip address 13.1.1.1/24 | Configure IPv4 address. |
R3(config-if)#exit | Exit from interface mode. |
R3(config)# router ospf 100 | Entering router ospf. |
R3(config-router)# ospf router-id 3.3.3.3 | Configure OSPF Router-ID. |
R3(config-router)# distribute bgp-ls | Configure Distribute BGP-LS. |
R3(config-router)# network 3.3.3.3/32 area 0.0.0.0 | Configure Network. |
R3(config-router)# network 10.1.1.0/24 area 0.0.0.1 | Configure Network. |
R3(config-router)# network 11.1.1.0/24 area 0.0.0.0 | Configure Network. |
R3(config-router)# network 12.1.1.0/24 area 0.0.0.0 | Configure Network |
R3(config-router)# segment-routing mpls | Configure segment-routing MPLS. |
R3(config-router)#exit | Exit from router-ospf mode. |
R3(config)#router bgp 100 | Entering router bgp. |
R3(config)# bgp router-id 3.3.3.3 | Configure BGP router-id |
R3(config-router)# neighbor 13.1.1.2 remote-as 300 | Configure E-BGP neighbor with remote-as. |
R3(config-router)# address-family link-state link-state | Configure link-state link-state address-family. |
R3(config-router-af)# neighbor 13.1.1.2 activate | Activating controller's interface address as neighbor in link-state link-state address family. |
R3(config-router-af)#exit | Exit from router bgp-address-family mode |
R3(config-router)#exit | Exit from router bgp mode |
R4
R4#configure terminal | Entering to config mode |
R4(config)# hostname R4 | Configure hostname |
R4(config)#interface lo | Going to interface mode for loopback interface. |
R4(config-if)#ip address 4.4.4.4/32 secondary | Configure IPv4 address. |
R4(config-if)#prefix-sid absolute 18004 | Configure Prefix-sid |
R4(config-if)#exit | Exit from interface mode. |
R4(config)#interface xe8 | Going to interface mode for xe8 interface. |
R4(config-if)#ip address 12.1.1.1/24 | Configure IPv4 address. |
R4(config-if)# label-switching | Configure Label-Switching. |
R4(config-if)#exit | Exit from interface mode. |
R4(config)#router ospf 100 | Entering router ospf. |
R4(config-router)# ospf router-id 4.4.4.4 | Configure OSPF Router-ID. |
R4(config-router)# network 4.4.4.4/32 area 0.0.0.0 | Configure network. |
R4(config-router)# network 12.1.1.0/24 area 0.0.0.0 | Configure network. |
R4(config-router)#segment-routing mpls | Enabling Segment-Routing. |
R4(config-router)#exit | Exit from router-ospf mode. |
R5
R5#configure terminal | Entering to config mode |
R5(config)# hostname R5 | Configure hostname |
R5(config)#interface lo | Going to interface mode for loopback interface. |
R5(config-if)#ip address 5.5.5.5/32 secondary | Configure IPv4 address. |
R4(config-if)#prefix-sid absolute 18005 | Configure Prefix-sid |
R5(config-if)#exit | Exit from interface mode. |
R5(config)#interface xe17 | Going to interface mode for xe17 interface. |
R5(config-if)#ip address 15.1.1.1/24 | Configure IPv4 address. |
R5(config-if)# label-switching | Configure Label-Switching. |
R5(config-if)#exit | Exit from interface mode. |
R5(config)#interface xe8 | Going to interface mode for xe8 interface. |
R5(config-if)#ip address 14.1.1.1/24 | Configure IPv4 address. |
R5(config-if)#exit | Exit from interface mode. |
R5(config)# router ospf 100 | Entering router OSPF. |
R5(config-router)# ospf router-id 5.5.5.5 | Configure OSPF router-id. |
R5(config-router)# distribute bgp-ls | Distributing BGP-LS. |
R5(config-router)# network 5.5.5.5/32 area 0.0.0.0 | Configure network. |
R5(config-router)# network 15.1.1.0/24 area 0.0.0.0 | Configure network. |
R5(config-router)# segment-routing mpls | Enabling Segment-Routing. |
R5(config-router)#exit | Exit from router-ospf mode. |
R5(config)#router bgp 200 | Entering router bgp. |
R5(config)# bgp router-id 5.5.5.5 | Configure BGP router-id |
R5(config-router)# neighbor 14.1.1.2 remote-as 300 | Configure E-BGP neighbor with remote-as. |
R5(config-router)#address-family link-state link-state | Entering link-state link-state address family. |
R5(config-router-af)# neighbor 14.1.1.2 activate | Activating controller's interface address as neighbor in link-state link-state address family. |
R5(config-router-af)#exit | Exit from router bgp-address-family mode. |
R5(config-router)#exit | Exit from router bgp mode. |
R6
R6#configure terminal | Entering to config mode |
R6(config)# hostname R6 | Configure hostname |
R6(config)#interface lo | Going to interface mode for loopback interface. |
R6(config-if)#ip address 6.6.6.6/32 secondary | Configure IPv4 address. |
R6(config-if)#prefix-sid absolute 18006 | Configure Prefix-sid |
R6(config-if)#exit | Exit from interface mode. |
R6(config)#interface xe17 | Going to interface mode for xe17 interface. |
R6(config-if)#ip address 15.1.1.2/24 | Configure IPv4 address. |
R6(config-if)# label-switching | Configure Label-Switching. |
R6(config-if)#exit | Exit from interface mode. |
R6(config)# router ospf 100 | Entering router OSPF. |
R6(config-router)# ospf router-id 6.6.6.6 | Configure OSPF Router-id. |
R6(config-router)# network 6.6.6.6/32 area 0.0.0.0 | Configure network. |
R6(config-router)# network 15.1.1.0/24 area 0.0.0.0 | Configure network. |
R6(config-router)#segment-routing mpls | Enabling Segment-Routing. |
R6(config-router)#exit | Exit from router-ospf mode. |
Controller (R7)
Controller#configure terminal | Entering to config mode |
Controller(config)# hostname Controller | Configure hostname |
Controller(config)#in eth1 | Entering to interface eth1. |
Controller(config-if)#ip address 13.1.1.2/24 | Configure IPv4 address. |
Controller(config-if)#in eth2 | Entering to interface eth2. |
Controller(config-if)#ip address 14.1.1.2/24 | Configure IPv4 address. |
Controller(config-if)#exit | Exit from interface mode. |
Controller(config-if)#router bgp 300 | Entering to router bgp mode. |
Controller(config-router)# neighbor 13.1.1.1 remote-as 100 | Configure neighbor with remote-as. |
Controller(config-router)# neighbor 14.1.1.1 remote-as 200 | Configure neighbor with remote-as. |
Controller(config-router)#address-family link-state link-state | Entering link-state link-state address family. |
Controller(config-router-af)# neighbor 13.1.1.1 activate | Activating R3's interface address as neighbor in link-state link-state address family. |
Controller(config-router-af)# neighbor 14.1.1.1 activate | Activating R5's interface address as neighbor in link-state link-state address family. |
Controller(config-router-af)#exit | Exit from bgp address-family mode |
Controller(config-router)#exit | Exit from router bgp mode. |
Last modified date: 10/20/2023