Let's get to the heart of the matter!
The Neighbor ID is our neighbor's router-ID.
Router-ID – IP address of our OSPF router.
It's not going
The Router-ID is defined as:
Priority 1: the router ID informed in the OSPF process.
Priority 2: The highest IP address configured on a loopback interface.
Priority 3: The highest IP address configured on a physical interface.
This IP address allows you to be identified by nearby OSPF routers.
A neighbor is a relationship between two OSPF routers.
They will both send each other "Hello" packages in order to introduce themselves.
Conditions to become a neighbor:
OSPF – Identical Authentication
OSPF – MTU identical
OSPF – Identical OSPF Area
OSPF – Belonging to the same type of OSPF area (Regular/Stub/NSSA)
OSPF – Hello interval – Dead Timer identical
OSPF – Belonging to the same network
OSPF – Unique Router-ID
A Hello Package
Lets announce yourself to your neighbours
Allows you to check the availability of your neighbours
Multicast Address 220.127.116.11 (18.104.22.168 for DR)
Broadcast or point-to-point
Hello interval – 10s
Dead-interval – 40s (4×10)
NonBroadcast or multi-point point
Hello interval – 30s
Dead-interval – 120s (4×30)
There are 8 states:
The dead-interval has come to an end.
The neighbor has been manually retracted, so he sends his Hello packages in unicast, but does not receive a reply.
Our router has received a Hello package from another router, but it is not yet certain that the router will see it.
Our router received a Hello package from another router. Our two routers can see each other.
Ex-start – Election of the Slavic and master (router-ID the highest).
Our two routers exchange a summary of their link state database (LSDB).
Our two routers exchange missing LSAs.
Full – The LSDBs of our two routers are identical and up-to-date.
In order to migrate from one state to another, OSPF uses this type of message:
Link State Request (LSR) – Ask its neighbour for specific LSAs.
Link State Update (LSU) – Sending requested LSA.
Link State Acknowledge (LSAck) – Accused of recess.
THE FINAL WORD!
Hoping to have been able to help you!
Don't hesitate if you have any questions or if you have any information to bring.