Vrf Route Leak - Alcatel-Lucent OmniSwitch 9900 Series Network Configuration Manual

Configuring IP

VRF Route Leak

VRF provides isolation of routing instances from each other. The basic principle of VRF is to exclude two
or more routing domains mutually by containing the exchange of routing information and forwarding
packets within the same routing instance. VRF provides independent routing instances logically separating
Layer3 topology of unrelated entities sharing a single physical infrastructure.
However, network devices in one VRF might need to access selected network devices in another VRF,
such as in the following scenarios:
•
In an enterprise, various departments can be isolated within individual VRFs but users in all the VRFs
need access to the Mail Server/common enterprise portal.
•
Users in other VRFs need Internet access that is available in only one VRF.
•
Buildings where multiple companies sharing the same router reside within individual VRFs have to
access common services like logistics, common network equipment that is a part of an independent
VRF.
VRF Route Leak feature can be used to forward routes from one VRF routing table to another VRF
routing table, allowing routing from one VRF to a gateway in another VRF.
Quick Steps for Configuring VRF Route Leak
The following steps provide a quick tutorial on how to configure VRF Route Leak. Each step describes a
specific operation and provides the CLI command syntax for performing that operation.
1
Create a route map to use as a filter for exporting or importing routes.
-> ip route-map R1 action permit
2
Define protocol preference for export policy route map using the
command. This route map controls the export of routes from the VRF FDB (Forwarding Routing
Database) to the GRT (Global Routing Table). A route map with no specific match clause matches all
FDB routes. For example,
-> ip route-map R1 match protocol static
3
Export routes from the source VRF to the GRT using the
-> ip export route-map R1
4
Define protocol preference for import policy route map using the
command. This route map controls the import of routes from the GRT. For example,
-> ip route-map R2 action permit
5
Import the leaked routes from the GRT using the
-> ip import vrf V1 import route-map R2
6
Configure route preference for imported routes using the
parameter. For example,
-> ip route-pref import 100
OmniSwitch AOS Release 8 Network Configuration Guide
ip route-map match protocol
ip export command. For example,
ip route-map match protocol
ip import command. For example,
ip route-pref command with the import
December 2017
VRF Route Leak
page 15-40