OSPF Neighbor State | Neighbor State Description | Down | Router is not receiving "hello" packets from adjacent routers. | Attempt | This state is for manually configured routes. Not used in SCI Networks. | Init | The router has received an initial "hello" packet from an adjacent router, but the local router does not have confirmation that the adjacent router has received hello packets in return. (1-way communication from the distant end router to the local router) | 2-way | Bi-directional communication has been established between 2 routers. The process of electing a designated router (DR) is started. | ExStart | The DR is elected and the routers are ready to start passing link-state information. | Exchange | The routers exchange database descriptor (DBD) packets which contain link-state advertisement (LSA) headers only and describe the contents of the entire link-state database | Loading | The process of exchanging link-state information (routing tables) between 2 adjacent routers has started. | Full | Normal state. Router has completed the exchange of link-state information with the adjacent router and their databases are synchronized. |

OSPF Neighbor State | Troubleshooting | Down | * Verify distant end router is operational * Ping and/or traceroute to the distant end router. | Init | * Ping and/or traceroute to the distant end router. * Verify successful ping to 224.0.0.5 | ExStart | * Verify Maximum Transmission Unit (MTU) size is correct for the interface | Exchange | * Verify Maximum Transmission Unit (MTU) size is correct for the interface |

Read Only Memory1. First memory used by the router during the bootup process. 2. Runs a power on self test, bootstrap program and ROM Monitor3. If Flash memory cannot be located, Router boots to a