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Below is a quick reference to the first 5 Link State Advertisements

1. LSA Type 1, Router advertisements, describing the states of a router's interfaces
2. LSA Type 2, Network Advertisements, describing the set of routers attached to a network
3. LSA Type 3 and 4, Summary Link Advertisements, describing inter-area routes, Type 3 describe routes to networks Type 4 describe routes to AS boundry routers
4. LSA Type 5, External Link Advertisements, describing routes to destinations external to the AS generated by ASBRs

Quick reference glossary

• ASBR - Autonomous System Border Router
• ABR - Area Border Rotuer
• DR - Designated Router
• BDR - Backup Designated Router