Table of Contents
- 1 What is a backbone area in OSPF?
- 2 What is the difference between backbone area and stub area in OSPF?
- 3 Why do we need backbone area?
- 4 What is backbone router?
- 5 What must all non-backbone OSPF areas connect to when deploying Multiarea OSPF?
- 6 When implementing OSPF all areas must directly connect to the backbone area?
What is a backbone area in OSPF?
An OSPF backbone area consists of all networks in area ID 0.0. 0.0, their attached routing devices, and all ABRs. The backbone itself does not have any ABRs. The backbone distributes routing information between areas. The routing devices that make up the backbone must be physically contiguous.
Why do we need areas in OSPF?
OSPF uses areas to simplify administration and optimize traffic and resource utilization. An area is simply a logical grouping of contiguous networks and routers. All routers in the same area have the same topology table and don’t know about routers in the other areas.
What is the difference between backbone area and stub area in OSPF?
The backbone is considered a standard area. Stub areas can contain type 1, 2, and 3 LSAs. A default route is substituted for external routes. Totally stubby areas can only contain type 1 and 2 LSAs, and a single type 3 LSA.
Which area is referred to as the backbone area?
The backbone area (also known as area 0 or area 0.0. 0.0) forms the core of OSPF networks. The backbone area is the logical and physical structure for the OSPF domain and is attached to all non-zero areas in the OSPF domain.
Why do we need backbone area?
Backbone Area The backbone area forms the central hub of an OSPF network. All other areas are connected to it, and inter-area routing happens via routers connected to the backbone area and to their own non-backbone areas. The backbone area distributes all routing information between the non-backbone areas.
Can we use OSPF without backbone area?
No OSPF should have a backbone area because it acts as a hub to transmit routing information about other areas in the network.
What is backbone router?
A backbone router is a router designed to be used to construct backbone networks using leased lines. Backbone routers typically do not have any built-in digital dial-up wide-area network interfaces.
How does OSPF area work?
What is OSPF and How Does it Work? When configured, OSPF will listen to neighbors and gather all link state data available to build a topology map of all available paths in its network and then save the information in its topology database, also known as its Link-State Database (LSDB).
What must all non-backbone OSPF areas connect to when deploying Multiarea OSPF?
OSPF routers may have large routing tables if routes are not summarized. What must all non-backbone OSPF areas connect to when deploying multiarea OSPF? Match the OSPF LSA types to their descriptions. (Not all options are used.)
What is the purpose of stub area?
Stub area, also called stub area, the so-called stub area, means that the area does not accept any external routes of non-OSPF network, if it wants to reach those external routes, only Need to send it through the default route. This area supports 1, 2, and 3 LSAs.
When implementing OSPF all areas must directly connect to the backbone area?
In OSPF domains the area topology is restricted so that there must be a backbone area (area 0) and all other areas must have either physical or virtual connections to the backbone.
How does OSPF prevent loops?
Because inter-area OSPF is distance vector, it is vulnerable to routing loops. It avoids loops by mandating a loop-free inter-area topology, in which traffic from one area can only reach another area through area 0.