Scale: BGP is more flexible and scalable than OSPF and it is also used on a larger network. Preferred path: OSPF is used to determine the fastest route while BGP puts emphasis on determining the best path. Protocol: In OSPF, internet protocol is used. While in BGP, transmission control protocol is used.
Is OSPF still used?
OSPF is the most widely used but it is not the only choice. With that said, it is the most standardized IGP and that allows for optimal vendor interoperability. OSPF is primarily used for internal routing because it’s a link-state routing protocol.
Why do we use OSPF areas?
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. … the routing tables on the routers are reduced.
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.
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).
Is OSPF good?
Pros: OSPF routing protocol has complete knowledge of network topology, allowing routers to calculate routes based on incoming requests. … So OSPF converges faster than RIP and has better load balancing. OSPF multicasts link-state updates and sends the updates only when there is a change in the network.
What is better than OSPF?
For the backward compatibility with the older routers, the EIGRP is the better option relative to the OSPF. When it comes to convergence time, the EIGRP has less convergence time as it uses DUAL algorithm where the best path and the alternative best path is selected.
What layer is OSPF?
OSPF and BGP belong to the Application Layer.
Is OSPF TCP or UDP?
OSPF Packets
Because OSPF does not use UDP or TCP, the OSPF protocol is fairly elaborate and must reproduce many of the features of a transport protocol to move OSPF messages between routers. There can be one of five OSPF packet types inside the IP packet, all of which share a common OSPF header.
Why is BGP used?
What is BGP used for? BGP offers network stability that guarantees routers can quickly adapt to send packets through another reconnection if one internet path goes down. BGP makes routing decisions based on paths, rules or network policies configured by a network administrator.
Why we use BGP in MPLS?
BGP is a protocol used to carry external routing information such as customers’ routing information or the internet routing information. … The MPLS tunneling mechanism allows core routers to forward packets using labels only without the need to look up their destinations in IP routing tables.
Who invented OSPF?
OSPF is developed by Internet Engineering Task Force (IETF) as one of the Interior Gateway Protocol (IGP), i.e, the protocol which aims at moving the packet within a large autonomous system or routing domain. It is a network layer protocol which works on the protocol number 89 and uses AD value 110.
How many states are in OSPF?
OSPF has eight neighbor states: Down, Attempt, Init, 2-way, Exstart, Exchange, Loading, and Full. Down: indicates that a router has not received any Hello packets from its neighbors within a neighbor dead interval.
What is OSPF area?
By definition an OSPF area is a collection of networks, not a collection of routers. A backbone network segment is an IP subnet that belongs to the area identified by 0.0. 0.0. Areas that are not physically connected to the backbone are logically connected by a backbone ABR using an OSPF virtual link.
Should I use OSPF or EIGRP?
Both of them could be widely deployed in Internet Protocol (IP) networks for data communication. EIGRP is a popular choice for routing within small and big campus networks. While OSPF is the best choice when your network hardware devices come from various vendors.
Can you use RIP and OSPF together?
The operation of the RIP and OSPF routing protocols is interface dependent. Each interface and virtual sub-interface can have RIP and OSPF settings configured separately, and each interface can run both RIP and OSPF routers.
What is Area 0 called in OSPF?
The backbone area (Area 0) is the core of an OSPF network. All other areas are connected to it and all traffic between areas must traverse it. All routing between areas is distributed through the backbone area.
Is is OSPF?
Both IS-IS and Open Shortest Path First (OSPF) are link-state protocols, and both use the same Dijkstra algorithm for computing the best path through the network. … While OSPF was natively built to route IP and is itself a Layer 3 protocol that runs on top of IP, IS-IS is an OSI Layer 2 protocol.
Can you use BGP with OSPF?
If you configure the redistribution of OSPF into BGP without keywords, only OSPF intra-area and inter-area routes are redistributed into BGP, by default. You can use the internal keyword along with the redistribute command under router bgp to redistribute OSPF intra- and inter-area routes.
What are the advantages and disadvantages of OSPF?
- no limitation on the hop count.
- intelligent use of Variable Length Subnet Masks (VLSM) is very useful in IP address allocation.
- IP multicasting to send link-state updates.
- better convergence than RIP.
- allowing better load balancing.
- allowing a logical definition of networks where routers can be divided into areas.
Is OSPF hard to learn?
Many students I talk to think they understand OSPF….but they really don’t (for the most part). Not only is OSPF difficult, it’s very complex. Because every router needs to have a complete map of the topology, a lot of rules needs to be followed in order to keep the map sorted to find the best path.
Is OSPF Classful or classless?
Classful routing protocols do not carry subnet masks; classless routing protocols do. Older routing protocols, including RIP and IGRP, are classful. Newer protocols, including RIP-2, EIGRP, and OSPF, are classless.
How OSPF works explain with example?
OSPF is a routing protocol. … Each OSPF router passes along information about the routes and costs they’ve heard about to all of their adjacent OSPF routers, called neighbors. OSPF routers rely on cost to compute the shortest path through the network between themselves and a remote router or network destination.