Dynamic Route Leaking; Configuring Route Leaking With Filtering - Dell C9000 Series Networking Configuration Manual

The following example relates to the configuration shown in Figure1 and Figure 2.
Router 1
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Router 2
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The following shows the output of the show commands on Router 1.
Router 1
The following shows the output of the show commands on Router 2.
Router 2

Dynamic Route Leaking

Route Leaking is a powerful feature that enables communication between isolated (virtual) routing domains
by segregating and sharing a set of services such as VOIP, Video, and so on that are available on one routing
domain with other virtual domains. Inter-VRF Route Leaking enables a VRF to leak or export routes that are
present in its RTM to one or more VRFs.
Previous FTOS releases support static route leaking, which enables route leaking through static commands.
Dynamic Route Leaking, introduced in the 9.7(0.0) release, enables a source VRF to share both its connected
routes as well as dynamically learnt routes from various protocols, such as ISIS, OSPF, BGP, and so on, with
other default or non-default VRFs.
You can also leak global routes to be made available to VRFs. As the global RTM usually contains a large pool
of routes, when the destination VRF imports global routes, these routes will be 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.

Configuring Route Leaking with Filtering

When you initalize route leaking from one VRF to another, all the routes are exposed to the target VRF. If the
size of the source VRF's RTM is considerablly large, an import operation results in the duplication of the target
VRF's RTM with the source RTM entries. To mitigate this issue, you can use route-maps to filter the routes that
are exported and imported into the route targets based on certain matching criteria. These match criteria
include, prefix matches and portocol matches.
Virtual Routing and Forwarding (VRF) 1160