Static routes can be used to exchange routes between CE routers and PE routers.
To exchange routes, a default static route must be configured on a CE router to its associated PE router. A static route must also be configured between the PE router and the network (or networks) that the PE wants to advertise as available through a VRF. In this task, the network shown below is configured for a default static route to forward routes between the networks attached to the CE routers and the PE routers. IBGP is used to forward routes between the PE routers and an LSP tunnel is configured across the MPLS domain. The diagram below contains all of the network addresses and AS numbers required to perform this configuration. The configurations are shown for only the CE 1, CE 5, PE 1 and PE 5 routers which demonstrates what is required to make VPN1 work. The configurations for VPN2, VPN3, and VPN 4 would essentially be the same.
This configuration example describes what is required to operate the CE 1 router in the diagram above. In this example, a default static route is configured between the CE 1 router and the attached interface of PE 1.
device(config)# ip route 0.0.0.0/0 10.33.33.3
device(config)# interface ethernet 0/1
device(config-if-e10000-0/1)# ip address 10.33.33.2
This configuration example describes what is required to operate the CE 5 router in the diagram above. In this example, a default static route is configured between the CE 5 router and the attached interface of PE 4.
device(config)# ip route 0.0.0.0/0 10.33.36.3
device(config)# interface ethernet 0/1
device(config-if-e10000-0/1)# ip address 10.33.34.2
This configuration example describes what is required to operate the PE 1 router in the diagram above. In this example, the VRF VPN1 is created with a unique route descriptor consisting of the BGP AS number (1) and a random other number (2), and route targets are set for import and export. The VRF (VPN1) is defined on the interface that connects to CE 1. A static route is configured between this router and the network connected to CE 1. IBGP with extended community attributes is configured between PE 1 and PE 4.
The OSPF area is specified as 0 and MPLS is set up for OSPF traffic engineering. In addition, MPLS is configured with a signaled LSP named "tunnel1" to PE 4.
device(config)# interface loopback 1
device(config-lbif-1)# ip address 10.2.2.1/24
device(config-lbif-1)# ip ospf area 0
device(config-lbif-1)# exit
device(config)# vrf VPN1
device(config-vrf-vpn1)# rd 1:1
device(config-vrf-vpn1)# route-target export 100:1
device(config-vrf-vpn1)# route-target import 100:2
device(config-vrf-vpn1)# exit-vrf
device(config)# ip route vrf VPN1 10.1.2.0/24 10.33.33.2
device(config)# router bgp
device(config-bgp)# local-as 1
device(config-bgp)# neighbor 10.2.2.2 remote-as 1
device(config-bgp)# neighbor 10.2.2.2 update-source loopback 1
device(config-bgp)# address-family vpnv4 unicast
device(config-bgp-vpnv4u)# neighbor 10.2.2.2 activate
device(config-bgp)# address-family ipv4 unicast vrf VPN1
device(config-bgp-ipv4u-vrf)# redistribute static
device(config-bgp-ipv4u-vrf)# exit
device(config)# router ospf
device(config-ospf-router)# area 0
device(config-ospf-router)# exit
device(config)# interface ethernet 0/2
device(config-if-e10000-0/2)# ip address 10.33.34.1/24
device(config-if-e10000-0/2)# ip ospf area 0
device(config-if-e10000-0/2)# exit
device(config)# router mpls
device(config-mpls)# policy
device(config-mpls-policy)# traffic-engineering ospf
device(config-mpls)# mpls-interface eth 0/2
device(config-mpls)# lsp tunnel1
device(config-mpls-lsp-tunnel1)# to 10.2.2.2
device(config-mpls-lsp-tunnel1)# enable
device(config-mpls-lsp-tunnel1)# exit
device(config)# interface ethernet 0/1
device(config-if-e10000-0/1)# vrf forwarding VPN1
device(config-if-e10000-0/1)# ip address 10.33.33.3/24
device(config-if-e10000-0/1)#
This configuration example describes what is required to operate the PE 4 router in the diagram above. In this example, the VRF VPN1 is created with a unique route descriptor consisting of the BGP AS number (1) and a random other number (2), and route targets are set for import and export. The VRF (VPN1) is defined on the interface that connects to CE 5. A static route is configured between this router and the network connected to CE 5.
IBGP with extended community attributes is configured between PE 1 and PE 4. The OSPF area is specified as 0 and MPLS is set up for OSPF traffic engineering. In addition, MPLS is configured with a signalled LSP named "tunnel1" to PE 1.
device(config)# interface loopback 1
device(config-lbif-1)# ip address 10.2.2.2/32
device(config-lbif-1)# ip ospf area 0
device(config-lbif-1)# exit
device(config)# vrf VPN1
device(config-vrf-vpn1)# rd 1:2
device(config-vrf-vpn1)# route-target export 100:2
device(config-vrf-vpn1)# route-target import 100:1
device(config-vrf-vpn1)# exit-vrf
device(config)# ip route vrf VPN1 10.1.2.0/24 10.33.36.2
device(config)# router bgp
device(config-bgp)# local-as 1
device(config-bgp)# neighbor 10.2.2.1 remote-as 1
device(config-bgp)# neighbor 10.2.2.1 update-source loopback 1
device(config-bgp)# address-family vpnv4 unicast
device(config-bgp-vpnv4u)# neighbor 10.2.2.1 activate
device(config-bgp)# address-family ipv4 unicast vrf VPN1
device(config-bgp-ipv4u-vrf)# redistribute static
device(config-bgp-ipv4u-vrf)# exit
device(config)# router ospf
device(config-ospf-router)# area 0
device(config-ospf-router)# exit
device(config)# interface ethernet 0/2
device(config-if-e10000-0/2)# ip address 10.33.35.1/24
device(config-if-e10000-0/2)# ip ospf area 0
device(config-if-e10000-0/2)# exit
device(config)# router mpls
device(config-mpls)# policy
device(config-mpls-policy)# traffic-engineering ospf
device(config-mpls)# mpls-interface eth 0/2
device(config-mpls)# lsp tunnel1
device(config-mpls-lsp-tunnel1)# to 10.2.2.1
device(config-mpls-lsp-tunnel1)# enable
device(config-mpls-lsp-tunnel1)# exit
device(config)# interface ethernet 0/1
device(config-if-e10000-0/1)# vrf forwarding VPN1
device(config-if-e10000-0/1)# ip address 10.33.36.3/24
device(config-if-e10000-0/1)# exit