Learn how to design, implement, and troubleshoot networks with our CCNA online training program. Learn Networking by Expert Instructors Only. certified instructors only.
The following list describes the five different types of OSPF link-state packets (LSP). Each packet serves a specific purpose in the OSPF routing process.
1. Hello: Used to establish and maintain adjacency with other OSPF routers
2. Database description (DBD): Contains an abbreviated list of the sending router’s link-state database and is used by receiving routers to check against the local link-state database
3. Link-state request (LSR): A request for more information about an entry in the DBD
4. Link-state update (LSU): Used to reply to LSRs as well as to announce new information
5. Link-state acknowledgment (LSAck): Confirms receipt of an LSU
