In BGP MPLS IP VPN, if OSPF protocol is used to exchange routing information between PE and CE, the domain identifier (Domain ID) is used to distinguish whether the routes imported in the VPI instance come from the same OSPF domain.

In BGP MPLS IP VPN, if OSPF protocol is used to exchange routing information between PE and CE, the domain identifier (Domain ID) is used to distinguish whether the routes imported in the VPI instance come from the same OSPF domain.

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