Link Type – Each link state advertisement has a specific format. The link can be a Router Link, Network Link, External Link, Summary Link or Stub Link.

Link State ID – Identifies the piece of the routing domain that is described by the advertisement. It can be either a router ID or an IP address.

Originating Router ID – Identifies the originating router in the autonomous system.

OSPF Sequence Number – The number for the link. Use this parameter to detect old and duplicate links state advertisements. The larger the sequence number the more recent the advertisement.

Link State Age – The age of the link state advertisement in seconds.

Checksum – This parameter is a checksum of the complete contents of the advertisement, except for the Age value.

Area ID – The IP address of the area.