I recently worked in a preconfigured virtual lab environment which had a Juniper vSRX configured in it with multiple VRFs. Each VRF actually had OSPF running between the VRF instance and the default routing instance. Interestingly, this was carried out by looping a cable from one interface configured in the default instance to another physical interface configured in the VRF instance. Seems like a waste of interfaces since you could just export routes from VRF tables into the default instance without OSPF in both Junos and IOS. But I am curious how else you could configure OSPF between VRFs?
Is there a way to configure OSPF between VRFs virtually rather than this kind of physical linking? I realize the configuration for this could be very vendor-specific, but just curious at the methodologies. Anyone ever used this kind of configuration in production?
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