OSPF Route Preference
O - OSPF (intra-area)
IA - OSPF inter area
E1 - OSPF external type 1
E2 - OSPF external type 2
N1 - OSPF NSSA external type 1
N2 - OSPF NSSA external type 2
Distance and metric are evaluated as a second step, between routes of same type.
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