I´m configuring a VPNv4 between two sites. In principal site I receive some prefixes through OSPF and in the backup site the same prefixes through OSPF. I´m redistributing OSPF routes through BGP to backup site.
In summary, in backup site the ASR9K receives the same prefixes through OSPF (local) and BGP but ASR must prefer BGP routes
a L3 network topology would possibly help to understand your goals and challenges. In general, in scenarios with OSPF and VPNv4 there's a challenge, that OSPF prefixes will be preferred indeed, if the two sites have a backdoor link. To overcome this, there's a feature in OSPF called 'sham-link', which makes the prefixes learned across the backbone(and hence via MP-BGP) more prefrred.
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