Difference Between OSPF and BGP

The big difference between OSPF and BGP is that OSPF is an intradomain routing protocol, while BGP is the interdomain routing protocol. The OSPF protocol uses County Status Routing. On the other hand, the BGP protocol uses road vector routing.

The routing operations performed in an autonomous system are known as intradomain routing or internal gateway routing. When routing is performed between two autonomous systems, this is called interdomain routing or external gateway routing. An autonomous system is a combination of network and router controlled by a single administration.

Definition of OSPF

The shortest open path is first an integrated gateway protocol. The Internal Gateway Protocol Workgroup (IGP) was formed to design an IGP based on the Shortest Path Algorithm (SPF) for use in Internet Protocol networks. It uses link state routing. OSPF was created because of the limitations during the RIP. The RIP protocol had limited capacity to service large heterogeneous websites. OSPF is a connection state routing that can work within a hierarchy. The highest and largest entity in the hierarchy is the autonomous system. OSPF calls to the routers in the hierarchical area for sending link statistics displays.

OSPF allows for different authentication systems and every change within the routers needs to be verified. The purpose of the authentication is to allow the only authorized routers to announce the route information. The separate routes are calculated based on WOP numbers and high throughput for each service type to a single destination. If there are several equally low roads to the destination, carry out a load distribution, in which the traffic is evenly distributed.

In OSPF, the network is grouped in a separate area. One area hides its topology from the remaining autonomous system and also from other areas. This hidden information reduces the routing traffic. In order to distinguish the acquired information in the network (internal sources) from the information received from an external router (external sources), the various message formats are used in OSPF.

Space partitioning creates two different types of routing, depending on where the network is and whether it is in the same area or in different areas. If the source and the destination in the same area are referred to as intra-area routing and if the source and the destination in the different areas are called inter-area routing.

Definition of BGP

The Border Gateway Protocol (BGP) is an external gateway protocol for exchanging routing information for the Internet. Using any topology, BGP can connect any network of autonomous systems. There need only necessarily be at least one router in each autonomous system capable of executing BGP, which must be connected to at least one other autonomous BGP router.

A BGP can handle a set of AS connections in any configuration, network, or subnetwork, and it can also handle the changes that occur in the topology over time. The BGP system essentially exchanges information about network accessibility with other BGP systems and creates a graph for autonomous systems with the obtained availability information of the BGP routers. The field weight routing mechanism has been used in the BGP systems because remote vector routing and link state routing becomes unwieldy as the operating range becomes large.

In road vector routing, the router has a list of networks that can be reached by road to reach each of them. It saves network bandwidth and supports Classless Inter-Domain Routing (CIDR). The BGP protocol contains no information about what happens in an autonomous system and as a prerequisite for an autonomous system. It has its own internal topology and selects routing protocols to determine the routes.

It is called a Border Gateway Protocol because it requires a BGP router to communicate with a peer in another autonomous system, which is usually close to the edge of the autonomous system. This communication occurs when a pair of autonomous systems accept to exchange the routing information and involve the routers to become BGP buddies.

Important differences between OSPF and BGP

OSPF stands for Open Shortest Path First, while BGP is extended to the Border Gateway Protocol.
OSPF is an integrated gateway routing protocol that performs routing in an autonomous system. On the other hand, BGP is an external gateway routing protocol that allows routing operations between the two autonomous systems.

OSPF is easy to use while the implementation of BGP is complex.
The time a router has passed requires the release and updating of the latest routing information called convergence. This allows OSPF to achieve convergence in less time. On the other hand, BGP has a slow convergence rate compared to OSPF.

OSPF follows a hierarchical structure, while BGP normally assumes a mask structure.
OSPF requires intensive use of memory and CPU resources. In contrast, with BGP, the need for device resources depends on the size of the routing table.

BGP is more flexible and scalable than OSPF and, unlike OSPF, is used in a larger network.
The main goal of OSPF is to determine the best route, ie the fastest. Conversely, BGP emphasizes that you choose the best way.

OSPF uses County Status Routing, while BGP uses Road Vector Routing.


OSPF is a logging protocol for internal gateways, while BGP is a routing protocol for external gateways. OSPF is based on connection state routing, where each router sends router router status to every router in the environment. On the other hand, BGP is based on Road Vector Routing, where a router has a list of networks that can be reached along the path to reach them.
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