VRF Configuration Tasks

To configure a VRF to provide BGP VPN services:

1. Create the VRF.

   host1(config)#virtual-router vr1

   host1:vr1(config)#ip vrf vrfA

2. Assign a route distinguisher to the VRF.

   host1:vr1(config-vrf)#rd 100:100

3. Set the route-target import and route-target export lists for the VRF.

   host1:vr1(config-vrf)#route-target import 100:1

   host1:vr1(config-vrf)#route-target export 100:1

4. (Optional) Set import and export maps for the VRF.

   host1:vr1(config-vrf)#import map Another-route-map

   host1:vr1(config-vrf)#export map A-route-map

   host1:vr1(config-vrf)#exit

5. Assign interfaces for PE-to-CE links to the VRF from outside or inside the VRF context:

   host1:vr1(config)#interface gigabitEthernet 1/0

   host1:vr1(config-if)#ip vrf forwarding vrfA

   host1:vr1:vrfA(config-if)#ip address 10.16.2.77 255.255.255.0

   host1:vr1:vrfA(config-if)#exit

   or

   host1:vr1(config)#virtual-router :vrfA

   host1:vr1:vrfA(config)#interface gigabitEthernet 1/0

   Note: You can also use the ip vrf forwarding command to specify secondary route lookup at the parent (global) level, in the event the original lookup does not yield any results.

6. Use either of the following methods to establish how the VRF learns routes to customer sites:
   • Create static routes to the customer site in the VRF by one of the following methods:

     host1(config)#virtual-router vr1

     host1:vr1(config)#ip vrf vpnA

     host1:vr1(config-vrf)#ip route vrf vrfA 10.3.0.0 255.255.0.0 10.1.1.1

     host1:vr1(config-vrf)#ip route vrf vrfA 10.12.0.0 255.255.0.0 10.1.1.1

     or

     host1(config)#virtual-router vr1:vrfA

     host1:vr1:vrfA(config)#ip route 10.3.0.0 255.255.0.0 10.1.1.1

     host1:vr1:vrfA(config)#ip route 10.12.0.0 255.255.0.0 10.1.1.1

   • Configure an IGP on the VRF to learn routes from the CE router.

     See Configuring IGPs on the VRF for examples.

   • Configure a PE-to-CE EBGP session.

     See Configuring PE-to-CE BGP Sessions for information about configuring EBGP.

7. (Optional) Configure the router to generate a label for each different FEC pointed to by a BGP route in the VPN.

   host1:vr1(config-vrf)#ip mpls forwarding-mode label-switched

8. (Optional) For carrier-of-carriers VPNs, configure carrier-of-carriers mode in the provider carrier’s PE router that connects to the customer carrier’s network.

   host1:vr1:VrfA(config)#mpls topology-driven-lsp

   See Carrier-of-Carriers IPv4 VPNs for information about configuring carrier-of-carriers VPNs.

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