Administrator Guide

You can leak global routes for VRF. As the global RTM usually contains a large
pool of routes, when the destination VRF imports global routes, these routes are
duplicated into the VRF's RTM. As a result, it is mandatory to use route-maps to
filter out leaked routes while sharing global routes with VRFs.
Defaults N/A
Command Modes VRF MODE
CONFIGURATION
Command
History
Version Description
9.9(0.0) Introduced on the C9010.
9.8(0.0) Introduced on the S3048-ON and S4048-ON.
9.7(0.0) Introduced on the S4810, S4820T, S5000, S6000, S6000–ON, and Z9500.
Usage
Information
Use theip route-export tag command without specifying the route-map attribute to export all the
routes corresponding to a source VRF. This action exposes source VRF routes to various other VRFs,
which then import these routes using the ip route-import tag command. In Dell Networking OS,
you can configure only one route-export per VRF as only one set of routes can be exposed for leaking (or
sharing). However, you can configure multiple route-import targets because a VRF accepts routes from
multiple VRFs.
You can expose a unique set of routes from the source VRF for sharing with other VRFs. When there are
two VRFs export routes, there is no option to discretely filter leaked routes from each source VRF. You
cannot import one set of routes from one VRF and another set of routes from another VRF.
Only active routes are eligible for sharing. For example, if one VRF has two routes corresponding to BGP
and OSPF, and the BGP route is inactive, the OSPF route takes precedence over BGP. The inactive BGP
route is not shared even when the target VRF has the filtering options enabled to match BGP.
Related
Commands
ip route-import – imports routes from another VRF.
ip route-import
Import IPv4 routes leaked by another VRF using the tag specified by that VRF during route-export process.
C9000 Series
Syntax
ip route-import tag [route-map—name]
Parameters
route-import Enter the keyword route-import to import routes into the VRF.
tag Enter a tag (ASN number) to specify an import route target for importing routes
from another VRF.
To import leaked routes from another VRF, you must use the same ASN number
that is specified as the export route target at the source VRF.
route-map-name Enter the name of the route-map to filter the imported routes.
NOTE: You must use the route-map attribute while importing routes from the
global RTM. Route-maps enable you to filter routes at the import end based on
the matching criteria that you define in the route-map.
Defaults Not configured.
Command Modes
● CONFIGURATION
● VRF MODE
Virtual Routing and Forwarding (VRF) 1775