OSPF LSA Types
Link State Advertisements (LSAs) are the building blocks of OSPF routing. Each type serves a specific purpose:
Type 1 - Router LSA
Describes router's links within an area.
Type 2 - Network LSA
Generated by DR for multi-access networks.
Type 3 - Summary LSA
Inter-area routes generated by ABRs.
Type 4 - ASBR Summary
Path to ASBR for external routes.
Type 5 - External LSA
External routes redistributed into OSPF.