Example of Dynamic Inter-VRF route leaking

In this example, a route map called "import-map" has match criteria specified as prefixes that can be learned by means of routing protocols such as OSPF or BGP.

About this task

The figure below depicts a typical dynamic route-leaking scenario. VRFs “Yellow” and “Green” are virtual partitions in the same router. The destination VRF ("Green") is where the route is being leaked to, and the source VRF ("Yellow") is where the route is being leaked from. In this example, IPv4 is used.

Dynamic inter-VRF route leaking

1. Configure VRF "Green".
   

   device(config)# vrf Green
   device(config-vrf-Green)# address-family ipv4 unicast

2. Configure VRF "Yellow".
   

   device(config)# vrf Yellow
   device(config-vrf-Yellow)# address-family ipv4 unicast

3. Configure an IPv4 prefix list, named "import-prefix" in this example.
   

   device(config)# ip prefix-list import-prefix permit 10.2.3.0/24
   device(config)# ip prefix-list import-prefix permit 10.1.2.0/24
   

4. Configure a route map with "match" conditions, including metric and tag for matched routes, and then import it.
   

   device(config)# route-map import-map permit 10                        
   device(config-route-map-import-map/permit/10)# match metric 10
   device(config-route-map-import-map/permit/10)# match tag 10
   device(config-route-map-import-map/permit/10)# match ip address prefix-list import-prefix 
   
   

5. Import the desired route map for the specified VRF.
   

   device(config)# vrf Green
   device(config-vrf-Green)# address-family ipv4 unicast
   device(vrf-Green-ipv4-unicast)# ip import routes Yellow route-map import-map
   

6. (Optional) Redistribute any routes learned by OSPF (or BGP) in the source VRF into the destination VRF. The following shows an OSPF example.
   

   device(config-ipv4-unicast)# exit
   device(config-vrf-Green)# exit
   device(config)# router ospf
   device(config-router-ospf-vrf-default-vrf)# redistribute ospf