Why bgp is preferred over ospf

Now that you have gained a basic understanding of ospf and bgp, you may want to know when and how to choose from or apply them? On the one hand, if you are conducting internal routing, such as routing within a site, company, or campus, you will want to use OSPF as it is used for internal network routing. This would typically work between switches and routers in the same location.

On the other hand, if you are looking at building in-site with multiple homes, you might want to consider BGP. Generally, most of the service providers would adopt the BGP to carry customers' routes. One thing to mention is that they do not necessarily compete with each other, instead, they are used together in most cases.

Hi graham smart ,. You can create an ACL specifying the route you want to manipulate, then in any of the routing protocols it will depend in which of them you want to manipulate the AD you have to tell the protocol that increase or decreased the AD of the route based on the next hop of that route, for example, let's say that you want to manipulate inside OSPF:.

After this, the router will start to modify the AD "only for that route" based on the next hop that is advertising it. Without this the "distance" command won't recognize what route is going to manipulate. I'm telling you this because I didn't see it in your example.

Well, maybe you won't like my opinion but What the heck!? How is it still believing in an AD of over an AD of ? I think that maybe it's a kind of bug. I've tried this scenario a lot of times and it works for me.

Current configuration : bytes! Buy or Renew. Find A Community. Cisco Community. Join us in congratulating October's Spotlight Award Winners! Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Showing results for. Search instead for. Did you mean:. All Community This category This board. Its currently learned via BGP Thanks G -Graham Please note: My comments are simply suggestions.

Labels: Labels: Routing Protocols. Tags: bgp. I have this problem too. All forum topics Previous Topic Next Topic. Accepted Solutions. Rolf Fischer. OSPF call to the routers within the hierarchical area for sending the link state advertisements. OSPF allows various authentication schemes and every exchange within the routers need to be authenticated. The purpose of authentication is to permit the only authorized routers to advertise the routing information.

The separate routes are calculated to a single destination based on HOP count and high throughput for each type of service. When a number of equal-cost routes exist to the destination, it performs load balancing where the traffic is distributed equally. An area hides its topology from the remaining autonomous system and from other areas also.

This information hiding reduces the routing traffic. To distinguish the acquired information within the network internal sources from the information obtained from an outside router external sources , the distinct message formats are used in OSPF.

The Area partitioning builds two distinct kinds of routing according to the source and the destination location in the network, and whether they present in the same area or different area. When the source and destination present in the same area it is known as intra-area routing and if the source and destination present in the different area it is referred to as inter-area routing. By using an arbitrary topology, the BGP could connect any internetwork of autonomous systems.

The BGP system basically exchanges the network reachability information with other BGP systems and create graph of autonomous systems with the received reachability information at the BGP routers. The path vector routing mechanism is employed in the BGP systems because the distance vector routing and link state routing become intractable when the domain of the operation becomes large.

In path vector routing the router has the list of networks which can be reached with the path to reach each of them.