Administrator Guide

4 Congure the export target in the source VRF with route-map export_ospfbgp_protocol.
ip route-export 1:1 export_ospfbgp_protocol
5 Congure VRF-blue.
ip vrf vrf-blue
interface-type slot/port
ip vrf forwarding VRF-blue
ip address ip—address mask
A non-default VRF named VRF-blue is created and the interface 1/22 is assigned to it.
6 Dene the route-map import_ospf_protocol.
Dell(config)route-map import_ospf_protocol permit 10
7 Dene the matching criteria for importing routes into VRF-blue.
Dell(config-route-map)match source-protocol ospf
This action species that the route-map contains OSPF as the matching criteria for importing routes into vrf-blue.
8 Congure 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 Congure 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 conguration 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
The show VRF commands displays the following output:
Important Points to Remember
• Only Active routes are eligible for leaking. For example, if VRF-A has two routes from BGP and OSPF, in which the BGP route is not
active. In this scenario, the OSPF route takes precedence over BGP. Even though the Target VRF-B has specied ltering options to
match BGP, the BGP route is not leaked as that route is not active in the Source VRF.
• The export-target and import-target support only the match protocol and match prex-list options. Other options that are congured in
the route-maps are ignored.
• You can expose a unique set of routes from the Source VRF for Leaking to other VRFs. For example, in VRF-red there is no option for
exporting one set of routes (for example, OSPF) to VRF- blue and another set of routes (for example, BGP routes) to some other VRF.
Similarly, when two VRFs leak or export routes, there is no option to discretely lter leaked routes from each source VRF. Meaning, you
cannot import one set of routes from VRF-red and another set of routes from VRF-blue.
Conguring Route Leaking without Filtering Criteria
You can use the ip route-export tag command to export all the IPv4 routes corresponding to a source VRF. For leaking IPv6 routes,
use the
ipv6 route-export tag command. This action exposes source VRF's routes (IPv4 or IPv6 depending on the command that
Virtual Routing and Forwarding (VRF)
1087