Why use multi area in OSPF?
The reason you would create multiple area types is to avoid overwhelming routers with a huge routing table and topology database when they do not need to understand this information. To reduce router overhead in a large OSPF network, you can create different types of areas.
How many OSPF areas can be configured?
In general, to maximize stability, one router should not be in more than three areas. Designated router (DR) selection: In general, the DR and backup designated router (BDR) on a multiaccess link (for example, Ethernet) have the most OSPF work to do.
What is a multi area network?
A metropolitan area network (MAN) is smaller than a wide area network (WAN) but larger than a local area network (LAN).
What is the main disadvantage of multi area OSPF?
Assuming proper OSPF design and configuration, using multiple area concept brings vanish these disadvantages: In multiple area concept updates are kept within an area. They are not extend to other areas. Therefore routers affected by change are only within an area.
How is multi area 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.
Why we configure area in OSPF?
In OSPF, a single autonomous system (AS) can be divided into smaller groups called areas. This reduces the number of link-state advertisements (LSAs) and other OSPF overhead traffic sent on the network, and it reduces the size of the topology database that each router must maintain.
Why do we need AREA 0 in OSPF?
Albeit OSPF is a link state protocol, the way OSPF handles inter-area traffic leaves it prone to routing loops. This is why OSPF must connect back to area 0 – to avoid routing loops.
What is OSPF multi area adjacency?
The OSPFv2 Multiarea Adjacency feature allows you to configure a link on the primary interface to enable optimized routing in multiple areas. Each multiarea interface is announced as a point-to-point unnumbered link. You can only configure multiarea adjacency on an interface that has two OSPF speakers.
What is the advantage of a “area” in OSPF configuration?
The advantages of an “area” in OSPF configuration are: smaller routing table (no summarization by default): fewer routing table entries as network addresses can be summarized between areas. smaller link-state database (LSDB): fewer routers exchanging LSAs, minimizes processing and memory requirements.
How does OSPF generate default routes?
In order for OSPF to generate a default route, you must use the default-information originate command. There are two ways to advertise a default route into a normal area. The first is to advertise 0.0.0.0 into the OSPF domain, provided the advertising router already has a default route.
What is the main function of OSPF?
OSPF is a fast-converging,link-state IGP used by millions.
What is OSPF authentication used for?
Essentially, authentication is used to recognize which router can participate exchanging OSPF messages. For instance, a company has 4 routers and for security reasons, they are going to use OSPF authentication. Every router will have the same password and key id, so they are going to form a OSPF neighborhood.