The ospf network command uses a combination of networkaddress and wildcardmask. Simple ospf network need to create ospf routing process router configuration command router ospf specify the network running ospf should also specify the area 25. Ip routingconfiguring rip, ospf, bgp, and pbr ftp directory. In this tutorial well learn about the basics of open shortest path first ospf in short protocol configuration in ciscos 2811 series router using cisco packet tracer. Ospf configuration step by step guide this tutorial explains how to configure ospf routing protocol step by step with practical example in packet tracer. Ospf open shortest path first is one of the igps interior gateway protocols. Introduction this document is a specification of the open shortest path first ospf tcpip internet routing protocol. Open shortest path first ospf protocol configuration in router01. Ospf is developed by internet engineering task force ietf as one of the interior gateway protocol igp, i. You may have realized that you cannot run eigrp in a. Open shortest path first ospf is an open standard not proprietary and it. Before the pointtomultipoint keyword was added to the ip ospf network interface configuration command, some ospf pointtomultipoint protocol traffic was.
The open shortest path first ospf protocol, defined in rfc 2328, is an interior gateway protocol used to distribute routing information within a single autonomous system. Ospf will form neighbor relationships with adjacent routers in the same area. What this means is that you can run ospf in a network consisting of multivendor devices. The router ospf command enables ospf routing on the router, and the 1 before osfp is the process id of the osfp protocol. Create separate ospf templates for the two ospf routing types. Therefore, the neighbor command was not needed for pointtomultipoint interfaces because multicast took care of the traffic.
Configuration here is the topo ospf open shortest path first is a popular linkstate routing protocol. To remove an areas authentication specification or a specified area from the configuration, use the no form of this command. P1c106 network protocols configuration guide, part 1. Ospf configuration step by step guide computernetworkingnotes. Rip routing information protocol is one of the oldest routing protocols still in service. Configuring ospf passive traffic engineering mode, advertising labelswitched paths into ospfv2, example.
Open shortest path first ospf routing protocol dummies. It implements dijkstras algorithm, also known as the shortest path first spf algorithm. Ospf version 2 is documented in rfc 1583 a lengthy document that i find very difficult to read. Among all the three chosen samples, ospf is the most widely used routing protocol in large enterprise networks.
In this article we will see how to configure ospf step by step. Configure and verify open shortest path first ospf routing. You can set different process id from 165535 for each router. Bgp version 4 bgpv4 is the current standard deployment. Open shortest path first, or ospf, is a routing protocol thats based on open standards, meaning any vendor can implement its features. Ospf can be used for serviceside routing, to provide reachability to networks at the local site, and it can be used for transportside routing, to enable communication between the vedge router and other viptela devices when the router is not directly connected to the wan cloud. Configuring the traffic engineering metric for a specific ospf interface, ospf passive traffic engineering mode, example. Ospf is a linkstate routing protocol with a complex set of options and features. Ospf routes packets based entirely on the destination ip of the.
Ospf open shortest path first is a routing protocol developed by internet engineering task force ietf. Therefore, the neighbor router configuration command was not needed for. Ospf configuration, the router sends a notification message to the console stating that a neighbor relationship with another ospf router has been established. In this article we will learn about the ospf routing protocol.
The configuration of ospf routing protocol is easy as rip routing. Five types of ospf routing protocol packets hello packet type 1 database description packet type 2 linkstate request packet type 3 linkstate update packet type 4. Ospf is classified as an interior gateway protocol igp. Open shortest path first ospf is the first linkstate protocol that you will learn about. To remove the nssa distinction from the area, use the no form of this command. Please refer the beginning of this lesson to view the open shortest path first ospf protocol configuration ios commands. This means that it distributes routing information between routers belonging to a single autonomous system. Hop count is the metric that rip uses and the hop limit limits the network size that rip can support. In this case, you see that the process id is 100, the router is only configured for one area, and the spf algorithm has run twice on one lsa. P1c108 network protocols configuration guide, part 1. This ospf lab is created in packet tracer and you will learn the ospf single area configuration from this lab. Link state routing protocols advertise the state of their links. Configuring the ospf routing process objective setup an ip addressing scheme for ospf area 0. Open shortest path first open shortest path first ospf is an openstandard link state routing protocol.
Routing protocol is ospf 1 outgoing update filter list for all interfaces is not set. Incoming update filter list for all interfaces is not set. In this article we will make an example for advanced ospf configuration. Configuring ospf p1c111 before this feature, some ospf pointtomultipoint protocol traffic was treated as multicast traffic. Routing protocol configuration occurs in global configuration mode. Routing protocol packets are sent with type of service tos of 0. How to configure ospf ospf routing protocol configuration ccna ospf in packet tracer. Open shortest path first ospf is a linkstate routing protocol that is used to find the best path between the source and the destination router using its own shortest path first. Router 1 should be a asbr which redistributes the static routes. Ospf employs a hierarchical network design using areas. It is time to take a look to configuring ospf open shortest path first with an ospf configuration example. As a linkstate routing protocol it was based on the linkstate algorithm developed for the arpanet in 1980 and the isis routing protocol.
Ospf adheres to the following link state characteristics. We talked about ospf basics and made an ospf configuration for beginners on our course. Apart from being a linkstate protocol, it is also an open standard protocol. In my introduction on ospf i explained why we sometimes use multiple areas for ospf and in our configuration example, i showed you how to configure ospf for a single area. Open shortest path first ospf was designed as an interior gateway protocol igp, for use in an autonomous system such as a local area network lan. Learn ospf configuration commands, ospf show commands, ospf network configuration process id, network id, wild card mask and area number and ospf routing in detail. Ospf p art 2 configuration example interface serial00 description wan link ip address 172. Ospf is widely used in large networks such as isp backbone and enterprise networks. The working group was formed in 1988 to design an igp based on the.
Openshortestpathfirst ospf is the most widely used interior gateway protocol routing protocol on the world because it is a public nonproprietary routing protocol while its biggest rival, eigrp, is a cisco proprietary protocol so other vendors cant use it edit. Eigrp has become a public routing protocol since 20. This is a basic labs regarding ospf single area configure related to ccna or icnd12 exam. Connect to router01 console and use the following ios commands to configure open shortest path first ospf protocol in router01. Routers will exchange pieces of information called lsas link state advertisement in order to build a complete topology database which we call the lsdb link state database. The chapter starts by covering the basic ospf concepts. It then briefly explains why ospf is considered an improved routing protocol over routing information protocol rip by covering how ospf discovers, chooses, and maintains routing tables. Ospf allows for routing authentication by using different methods of password authentication. Border gateway protocol border gateway protocol bgp bgp is a standardized exterior gateway protocol egp, as opposed to rip, ospf, and eigrp which are interior gateway protocols igps. Comparison of rip, ospf and eigrp routing protocols based. Just like with other routing protocols covered so far rip, eigrp first you need to enable ospf on a router.
Once you are in the router ospf configuration submode, configure the lan network. Protocol header type attributes algorithm metric linkstate dijkstra cost bandwidth ad standard protocols transport 110 rfc 2328, 2740 ip ip89 router types internal router all interfaces reside within the same area backbone router a router with an interface in area 0 the backbone area border router abr connects two or more areas as boundary router asbr connects to additional routing domains. Next, you need to define on which interfaces ospf will run and what networks will be advertised. Ospf is perhaps the most widely used interior gateway protocol igp in large enterprise networks. Ospf is an open standard protocol, you learn more why we use ospf and ospf quiz from here.
Ospf commands area authentication p1r228 network protocols command reference, part 1 area authentication to enable authentication for an ospf area, use the area authentication command in router configuration mode. Ospf open shortest path first ospf is a standardized linkstate routing protocol, designed to scale efficiently to support larger networks. Dynamic routing protocols supported on the procurve secure. Once you are in the router ospf configuration submode, configure the lan network 172. Its newest implementation, version 2, which is explained in rfc 2328, is an open standard. Ospf is a classless protocol, and thus supports vlsms. Nonbroadcast multiaccess nbma is a particular challenge in any network environment. This is done by using the router ospf processid global configuration command. In following figure there are the three routers with. Open shortest path first ospf is a linkstate routing protocol, rather than a distance vector protocol.
This keeps track of external routes injected by exterior protocols such as bgp. In our example, we will examine the figure below deeply. Ospf p art 1 protocol header type attributes algorithm metric linkstate dijkstra cost bandwidth ad standard protocols transport 110 rfc 2328, 2740 ip ip89 router types. The main difference here is that a linkedstate protocol does not send its routing table in the form of updates, but only shared its connectivity configuration. This tutorial explains how to configure ospf routing protocol step by step with practical example in packet tracer. The open shortest path first ospf is a routing protocol for wide area networks and enterprise network. Verifying and monitoring ospf configuration techlibrary.
Ospf allows for the transfer and tagging of external routes injected into an autonomous system. Above we have r1 and r2 in area 0, the backbone area. Enabling ospf traffic engineering support, example. Sanctioned by the ietf, it is intended to become internets preferred interior routing protocol. This paper examines how ospf works and how it can be used to design and build large and. The open shortest path first ospf protocol is a link state protocol that handles routing for ip traffic. The first key command is show ip ospf, which shows basic configuration information related to the protocol and its operation. Modify ospf cost metric on an interface theory the open shortest path first ospf protocol is a linkstate, hierarchical interior gateway protocol igp for network routing. Introduction to open shortest path first ospf protocol. When a link state router begins operating on a network link, information associated with that logical network is added to its local link state database lsdb. Ospf is standardsbased which means it is available on routers by cisco as well as other vendors, making it a vendorneutral routing protocol. Three typical types of routing protocol are chosen as the simulation samples.
Learn how to configure ospf routing protocol using packet tracer. Advertising labelswitched paths into ospfv2, static. Now it is time to go deep and combine virtual link, lsa types and etc. How to configure ospf routing protocol using cisco packet. The isis is another linkstate dynamic routing protocol, which is more common in large service provider networks. Verifying an ospf configuration, tracing ospf protocol traffic, example. Open shortest path first ospf is a routing protocol developed for internet protocol ip networks by the interior gateway protocol igp working group of the internet engineering task force ietf. By collecting connectivity information from all of the devices on the network, ospf can store all this.1102 1494 817 1539 321 925 382 1483 1255 633 1321 1358 11 89 311 1186 469 1270 344 1067 339 490 738 1424 634 71 1260 643 798 711 1460 912 981 1506 348 676 467 89 647 264 446 1066 164 278