What is the difference between OSPF E1 and E2?

Basically the difference between E1 and E2 external routes is: E1 includes – the internal cost to ASBR added to the external cost, E2 does not include – internal cost. it is same as external cost.

What is set metric type Type 1?

1—Cost of the external routes is equal to the sum of all internal costs and the external cost.

Which route is preferred E1 or E2?

You can have ASBR 1 inject the external route as E1 and ASBR 2 inject the same external prefix as an E2 route. Due to the order of operations of OSPF, the E1 route will always be preferred regardless of the cost to the ASBR. But in case of single point of redistribution, it doesn’t matter what route type you use.

What metric does OSPF use?

Open Shortest Path First (OSPF) uses “Cost” as the value of metric and uses a Reference Bandwidth of 100 Mbps for cost calculation.

Where is external Type 1 metric useful?

External Type 1 will add up the cost of each link to the ASBR originating, this is useful if you want to use the most optimal path to the exit point.

What is OSPF metric type1?

A type 1 route has a metric that is the sum of the internal OSPF cost and the external redistributed cost. If routes are redistributed into OSPF as type 1, then the cost to reach the external networks could vary from router to router.

What is OSPF external type 1 and 2 routes and default?

Type 1 routes are preferred over type 2 routes in case two same cost routes exist to the destination. The default is type 2. Note that the type has changed to E1 and the cost has been incremented by the internal cost of S0 which is 64, the total cost is 64+50=114.

What is E1 in OSPF?

E1 routes indicate cumulative cost to reach the destination i.e. int indicates cost to reach ASBR + cost to destination from ASBR. E2 route reflects cost only from the ASBR to destination. This is the default used by ospf for redistribution.

Why are OSPF cost metrics adjusted?

You want to change the OSPF link costs. The custom in OSPF networks is to make the link cost inversely proportional to the bandwidth of a link. It is important to set the same reference bandwidth on all routers in an area, and preferably throughout the entire network. …

What is the difference between metric type 1 and 2?

A type 1 route has a metric that is the sum of the internal OSPF cost and the external redistributed cost. A type 2 route has a metric equal only to the redistributed cost.