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.

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