This article describes the OSPF redistribution routes related to the route metrics types.
Table of Contents
Scope
FortiGate.
Solution
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.