Can I know what the does the following statement means?
For OSPF E1 router, it is external to the autonomous system. E1 includes the internal cost to the ASBR added to the
Does it mean that the cost to reach a other AS is the internal cost + external advertised cost?
Please help to explain. Thanks
E1 means that you can advertise the route by the ASBR, ie the router advertising the non ospf route, and specify the metric.
Then the routers will add the metric to the ASBR to the advertised metric for the external routes.
This is used when you want to make sure that internal routers take their OWN best path to the ASBR. Whereas E2 you just advertise the metric on the ASBR and it is hard set throughout the ospf domain.
For E1 the metric will change the further away from the ASBR that the routes propogates. Whereas E2 it is the same value on all ospf routers in the ospf domain.