OSPF: Type-1 vs Type-2
OSPF: Type-1 vs Type-2 Type 1: Considered close to the AS. Metric is based on the sum of the internal and external costs. Type 2: Considered far away from the AS. Metric is based on the external cost only. OSPF router prefers a type 1 external router over a type 2. Each external route is assigned a metric. There are two types of external-route metrics. A type 1 metric is the sum of the external cost plus the internal cost to reach the ASBR. A type 2 metric is only the external cost (the internal cost is not considered). If there are two external routes to the same destination, one type 1 and one type 2, an OSPF router selects the type 1 route over the type 2 route. That is represented in E1 and E2.
