FAQ
OSPF – Open Shortest Path First (OSPF) is a link-state routing protocol that was developed for IP networks and is based on the Shortest Path First (SPF) algorithm. OSPF is an Interior Gateway Protocol (IGP). OSPF isused to distribute IP routing information throughout a single Autonomous System (AS) in an IP network
An OSPF routing domain (AS) can consist of a single area, but in that case the single area must be Area 0. Only the backbone area can generate the summary routing topology information that is used by the other areas. This is why all interarea traffic must pass through the backbone area. view the lab
Yes, It is mandatory for the OSPF routing domain to have area 0. This is a must. the reason is: OSPF Area 0 contains summary routing topology information that is used by the other areas/branches. All areas pass through Area Zero. In other terms all areas communicate to each other via Ospf area 0. On administration point of view, OSPF area 0 should be placed in consideration of Data traffic and resilience of routers, preferably identify your core area of administering your OSPF design areas. OSPF Scalable Design