01Plain English
The simple explanation
A router introduces its links to the area. Think of a local status update: these are my connections.
02Under the hood
The technical explanation
Every OSPFv2 router originates a Router LSA for each area it participates in. It describes link types, costs and relevant router capabilities. Flooding scope is the area. The Link State ID is the originating router’s router ID.
Protocol reference: RFC 2328 (OSPFv2). NSSA reference: RFC 3101.
logic
Make it stick
The person who joins the group chat and immediately explains their entire setup.
03On the wire
Example
An ABR attached to Area 0 and Area 10 originates a different Router LSA inside each area.