As I mentioned in this post MPLS VPN: Same OSPF Domain ID, OSPF domain ID is the same with OSPF process ID by default. By altering the domain ID or process ID, it also alters the behaviour of the OSPF routes. So the rule is if the domain IDs are
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MPLS VPN: Same OSPF Domain ID
On a Layer 3 MPLS VPN using OSPF as an IGP between PE and CE, OSPF domain ID is equivalent to the OSPF process ID by default. Therefore, OSPF routes are seen as OSPF inter-area (Type 3 OSPF LSA). By considering this behaviour, it is easy to distinguish real external
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