c589b6fa_pen_Shortest_Path_First__OSPF___Description
[Type #] 5 [LSA Name] AS-external [Description] 
Sent by a border router to describe external routes through itself. Can be used to advertise "this is the way to (all or part of) the Internet."
Types of link-state advertisements (LSAs) used in Open Shortest Path First (OSPF)
Description