7. Bringing Up Adjacencies

OSPF creates adjacencies between neighboring routers for the purpose of exchanging routing information. Not every two neighboring routers will become adjacent. This section covers the generalities involved in creating adjacencies. For further details consult Section 10.

• 7.1. The Hello Protocol
• 7.2. The Synchronization of Databases
• 7.3. The Designated Router
• 7.4. The Backup Designated Router
• 7.5. The graph of adjacencies