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route-map import_ospf_protocol and then specify the match criteria as OSPF using the match source-
protocol ospf command.
You can then use the ip route-import route-map command to import routes matching the filtering
criteria defined in the import_ospf_protocol route-map. For a reply communication, VRF-blue is
configured with a route-export tag. This value is then configured as route-import tag on the VRF-Red.
To configure route leaking using filtering criteria, perform the following steps:
1. Configure VRF-red using the following command:ip vrf vrf-redinterface
tengigabitethernet 1/11ip vrf forwarding vrf-redip address x.x.x.x 255.x.x.x
A non-default VRF named VRF-red is created and the interface 1/11 is assigned to this VRF.
2. Define a route-map export_ospfbgp_protocol.Dell(config)route-map
export_ospfbgp_protocol permit 10
3. Define the matching criteria for the exported routes.Dell(config-route-map)match source-
protocol ospfDell(config-route-map)match source-protocol bgp
This action specifies that the route-map contains OSPF and BGP as the matching criteria for
exporting routes from vrf-red.
4. Configure the export target in the source VRF with route-map export_ospfbgp_protocol.ip route-
export 1:1 export_ospfbgp_protocol
5. Configure VRF-blue.ip vrf vrf-blue interface tengigabitethernet 1/22ip vrf
forwarding VRF-blueip address x.x.x.x 255.x.x.x
A non-default VRF named VRF-blue is created and the interface 1/22 is assigned to it.
6. Define the route-map import_ospf_protocol.Dell(config)route-map import_ospf_protocol
permit 10
7. Define the matching criteria for importing routes into VRF-blue.Dell(config-route-map)match
source-protocol ospf
This action specifies that the route-map contains OSPF as the matching criteria for importing routes
into vrf-blue.
8. Configure the import target in VRF-blue with route-map import_ospf_protociol.ip route-import
1:1 import_ospf_protocol
When you import routes into VRF-blue using the route-map import_ospf_protocol, only OSPF
routes are imported into VRF-blue. Even though VRF-red has leaked both OSPF as well as BGP routes
to be shared with other VRFs, this command imports only OSPF routes into VRF-blue.
9. Configure the import target in the source VRF for reverse communnication with the destination
VRF.ip route-import 2:2
The show run output for the above configuration is as follows:
ip vrf vrf-Red
ip route-export 1:1 export_ospfbgp_protocol
ip route-import 2:2
! this action exports only the OSPF and BGP routes to other VRFs
!
ip vrf vrf-Blue
ip route-export 2:2
ip route-import 1:1 import_ospf_protocol
!this action accepts only OSPF routes from VRF-red even though both OSPF as
well as BGP routes are shared
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Virtual Routing and Forwarding (VRF)