VRF lite converts the router into multiple virtual routers each one with its separated routing table, interfaces and routing protocols.
The OSPF Support for Multi-VRF on CE Routers feature provides the capability of suppressing provider edge (PE) checks that are needed to prevent loops when the PE is performing a mutual redistribution of packets between the OSPF and BGP protocols. When VPN routing and forward (VRF) is used on a router that is not a PE (that is, one that is not running BGP), the checks can be turned off to allow for correct population of the VRF routing table with routes to IP prefixes.
When the OSPF process is associated with the VRF, several checks are performed when link-state advertisements (LSAs) are received. PE checks are needed to prevent loops when the PE is performing a mutual redistribution between OSPF and BGP interfaces. In some situations, performing PE checks might not be desirable. The concept of VRFs can be used on a router that is not a PE router (that is, a router that is not running BGP). With the capability vrf-lite command, the checks can be turned off to allow correct population of the VRF routing table with routes to IP prefixes.
This command suppresses the Provider Edge (PE) specific checks on a router when the OSPF process is associated with the VRF.
On a CE router running multi-VRF you won't need this technique to avoid routing loop (if you are doing redistribution), while its a must on a PE router talking BGP with other PE routers and each PE router is talking OSPF to its CE routers and each PE router is doing redistribution.
When VPN routing and forward (VRF) is used on a router that is not a PE (that is, one that is not running BGP), the checks can be turned off to allow for correct population of the VRF routing table with routes to IP prefixes.
Again the whole idea of this command is to disable the checks (which is a must on the PE doing redistribution in an MPLS backbone) in order not to introduce any problems when populating the VRF table on a multi-VRF CE router running OSPF.
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This document describes the programmatic interfaces, RESTful APIs, which are supported by Cisco Software Manager Server (CSM Server).
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