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Routing Instances for VPNs
To implement Layer 3 VPNs in the JUNOS software,
you configure one routing instance for each VPN. You configure the
routing instances on PE routers only. Each VPN routing instance consists
of the following components:
- VRF table—On each PE router, you configure one VRF
table for each VPN.
- Set of interfaces that use the VRF table—The logical
interface to each directly connected CE router must be associated
with a VRF table. You can associate more than one interface with the
same VRF table if more than one CE router in a VPN is directly connected
to the PE router.
- Policy rules—These control the import of routes
into and the export of routes from the VRF table.
- One or more routing protocols that install routes from
CE routers into the VRF table—You can use the BGP, OSPF, and
RIP routing protocols, and you can use static routes.
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