Quick Answer: What Is The Difference Between BGP And OSPF?

How does BGP work 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..

How OSPF cost is calculated?

Open Shortest Path First (OSPF) uses “Cost” as the value of metric and uses a Reference Bandwidth of 100 Mbps for cost calculation. The formula to calculate the cost is Reference Bandwidth divided by interface bandwidth. For example, in the case of 10 Mbps Ethernet , OSPF Metric Cost value is 100 Mbps / 10 Mbps = 10.

What is the advantage of BGP protocol?

BGP is a large part of the networking technology that goes into the Vault Networks network to not only provide the most stability and best latency possible for your connection, but also to minimize downtime.

Is BGP a layer 3 protocol?

For the most part, routing is a layer-3 function, but, as you pointed out, BGP uses a layer-4 protocol to communicate with other BGP speakers in order to do what is normally considered a layer-3 function. Many network protocols fall into a gray area, or are considered in one layer while using another layer.

Does OSPF use hop count?

Like EIGRP, OSPF bases its metric by default on link bandwidth, so that OSPF makes a better choice than simply relying on the router hop-count metric used by RIP. But OSPF uses much different internal logic, being a link-state routing protocol rather than a distance vector protocol.

Why OSPF is not used as EGP?

The IETF working group for OSPF was, in fact, started in 1988, while the original version of BGP, called EGP, was originally specified by Eric Rosen in 1982, some 6 years earlier. The short answer might be, then, that OSPF was not considered because OSPF had not been invented yet.

Which layer is OSPF?

OSI layer designation IS-IS runs on the data link layer (Layer 2) Open Shortest Path First (OSPF) is encapsulated in IP, but runs only on the IPv4 subnet, while the IPv6 version runs on the link using only link-local addressing. IGRP, and EIGRP are directly encapsulated in IP.

When should we prefer BGP in networking?

In this article, I’ll give you five scenarios where BGP is the best match for your network requirements.Internet service advantages. … Layer 3 VPN services. … Increasing network stability. … Automatic Response to Denial-of-Service Attacks. … Large-scale QOS or web caching deployment. … 2 comments.

Why BGP is used over OSPF?

With BGP on the other hand, the size of the routing table dictates the required device resources. 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.

What is the default cost of OSPF?

Default values: 100 Mbps—The default cost is 5.

Which is better RIP or OSPF?

Unlike RIP protocol that has only 15 hops at most, OSPF has no limitations in hop count. So OSPF converges faster than RIP, and has better load balancing. The drawbacks of OSPF, however, is that it doesn’t scale when there are more routers added to the network.

What is RIP OSPF and BGP?

OSPF and RIP are Interior Gateway Protocols (IGP) and distribute routing information within an autonomous system, whereas BGP is a Exterior Gateway Protocol. The routes learned via the dynamic routing protocols are applied to the kernel routing table.

Can OSPF be used as EGP?

You could use OSPF in certain inter-AS situations if you REALLY, REALLY wanted to/needed to. There would be many “gotchas” and caveats to keep in mind when utilizing OSPF as an EGP. Just like you could hammer nails with a screwdriver. However, you would risk breaking the screwdriver, harming yourself, etc.


Unlike other routing protocols, OSPF does not carry data via a transport protocol, such as the User Datagram Protocol (UDP) or the Transmission Control Protocol (TCP). Instead, OSPF forms IP datagrams directly, packaging them using protocol number 89 for the IP Protocol field.

Why do we use BGP?

Border Gateway Protocol (BGP) is used to Exchange routing information for the internet and is the protocol used between ISP which are different ASes. The protocol can connect together any internetwork of autonomous system using an arbitrary topology.

Why BGP is used in MPLS?

Extensions of the BGP protocol can be used to manage an MPLS path. The Border Gateway Protocol (BGP) is a path vector protocol which acts as a core routing protocol of the Internet. BGP is an important internet protocol used by ISP to establish routing between one another.

Why we use OSPF?

The main advantage of a link state routing protocol like OSPF is that the complete knowledge of topology allows routers to calculate routes that satisfy particular criteria. This can be useful for traffic engineering purposes, where routes can be constrained to meet particular quality of service requirements.

IS IS routing protocol vs OSPF?

Comparison with 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.