Highest ip address of any of the routers loopback addresses. Overview in lab 6 we discussed rip, which is the canonical example of a routing protocol built on the distancevector algorithm. For example, r1 wants to find out if it has any neighbor running ospf it sends a hello message to the multicast address 224. Introduction open shortest first path protocol preferred igp the myth. This article is the fourth in a series of articles covering the basics of cisco networking. Enter the configure terminal command to enter global configuration mode. Ospf stands for open shortest path first and is a routing protocol adaptive for ip networks. Cisco any yes yes 1040 cisco full mesh no yes 1040 cisco pointtopoint area 0 a backbone area 9. The second example will enable ospf on the interface that has the exact ip address 10. The open shortest path first ospf protocol, defined in rfc 2328, is an interior gateway. May 04, 2019 configuration ospf routeur cisco pdf this of course leads to more complexity in the configuration and troubleshooting of ospf networks.
Hi this mohd salmans tutorial video about ospf routing protocolcisco ospf. Classless routing section 16 configuring static routes. 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. Part ii the cisco ios section 10 router components section 11 introduction to the cisco ios section 12 advanced ios functions part iii routing section the routing table section 14 static vs. Open shortest path first a routing protocol based on the linkstate algorithm objective the objective of this lab is to configure and analyze the performance of the open shortest path first ospf routing protocol. This article takes a look at the configuration of open shortest path first ospf. Welcome to website, a free ccna tutorial site that closely follows the cisco ccna curriculum. The site was designed to help you pass the ccna exam 200125, but it can also be used as a reference site for anything networking related. Ospf is hard to use evolved from isis protocol link state protocol 4. Although a cisco switch is a much simpler network device compared with other devices such as.
A priority of 0 will prevent the router from being. Ospf open shortest path first protocol is a wellknow routing protocol that is widely used today. In this article we will learn about the ospf routing protocol. In case equal cost paths exist to the same destination, ciscos implementation of ospf will keep track of up to six next hops to the same destination. If you have trouble understanding ospf then you might find my ccna or ccnp book helpful. The router ospf processid command is the beginning of any cisco ios ospf configuration. How to configure ospf routing protocol using cisco packet. This tutorial introduces you to open shortest path first ospf, a linkstate routing protocol. Configuration ospf routeur cisco pdf this of course leads to more complexity in the configuration and troubleshooting of ospf networks. After the router builds the shortest path tree, it will start building the routing table accordingly. 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. Section 20 ospf part iv vlans, accesslists, and services. Chapter routing protocols rip, ospf, and bgp pdf created with fineprint pdffactory pro trial version. How to use and implement ospf as the protocol of choice.
Standart area backbone area area 0 stub area totally stubby area nssa totally nssa. Give c second priority bdr in election ip ospf priority 50 interface loopback0 ip address 10. To configure basic ospf to form a neighbor adjacency on a cisco router perform the following. Ospf open shortest path first ospf is a standardized linkstate routing protocol, designed to scale efficiently to support larger networks. 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.
Step by step guide to configure ospf routing protocol on cisco routers. 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. Download cisco ccnp routing pdf study guide snabay networking. No particular manufacture maintains or owns this open standard protocol, in cisco networks, ospf is the most prevalent. 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.
Link state routing protocols advertise the state of their links. Ospf open shortest path first is a popular linkstate routing protocol. Cisco router configuration tutorial cisco internetwork operating system. This video explains ospf features, ospf hierarchy, configuring ospf, verifying ospf and gives ospf details. It uses a routing algorithm at link state and falls into the interior protocols for routing and operating using one autonomous system. Open shortest path first ospf inetdaemons it tutorials. Ospf tutorial to get you on the right path udemy blog. Ospf is a protocol of routing allowing packets of date to follow and select the networks most suitable and shortest data path. Ip address configured with the ospf routerid command. Ospf open short path first,it is a open standard routing protocol,link state routing protocol algorithm dijkistra,to find shortest path administrativ distance110. The open shortest path first ospf protocol, defined in rfc 2328, is an interior gateway protocol used to distribute routing information within.
You can use real cisco devices or any other network simulator. This tutorial explains how to configure ospf routing protocol step by step with practical example in packet tracer. Ospf neighbor discovery process all neighboring router with ospf enabled receive the hello packet checks contents of the hello message and if certain information match it reply unicast to that hello with sending its router id in the neighbor list. Jan 11, 2010 an introduction to open shortest path first ospf. Download cisco ccnp routing pdf study guide snabay. Ospf will form neighbor relationships with adjacent routers in the same area.
Ospf p art 1 protocol header type attributes algorithm metric linkstate dijkstra cost bandwidth ad standard. How to configure opsf in gns3 open shortest path first protocol. Identify the network interfaces that should run ospf. To download cisco ccnp routing pdf study guide click here. Jul 30, 2017 how to configure opsf in gns3 open shortest path first protocol. Open shortest path first open shortest path first ospf is an openstandard link state routing protocol. Hi this mohd salmans tutorial video about ospf routing protocol cisco ospf protocol. Ospfopen short path first,it is a open standard routing protocol,link state routing protocol algorithm dijkistra,to find shortest path administrativ distance110.
It is used to allow routers to dynamically learn routes from other routers and to advertise routes to other routers. Optional md5 authentication configured ip ospf authentication messagedigest ip ospf messagedigestkey 1 md5 foobar. Ospf is a standard internal gateway protocol igp that is used by many different types and sizes of companies. This is the multicast address for all ospf routers and all routers running ospf will proceed this message. Each command mode provides a different group of related commands. In this lesson ill explain the basics of ospf to you and you will learn how and why it works. Now, when bgp should be used is when your company is connecting to more than one as or isp because decisions on the best links to use can be made by utilizing these bgp path attributes. Once you are in the router ospf configuration submode, configure the lan network 172.
This paper examines how ospf works and how it can be used to design and build large and complicated networks. Ospf or isis j assign loopback interfaces and 32 addresses to each router which will run the igp loopback is ospf and bgp router id used for ibgp and route origination deploy igp e. Ospf configuration step by step guide computernetworkingnotes. 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. May 19, 2018 introduction to open shortest path first ospf a tutorial open shortest path first ospf is a link state routing protocol which was first defined as version 2 in rfc 2328. Tcpip environment fast convergence variablelength subnet masks discontiguous subnets incremental updates route authentication. How to configure ospf routing protocol using packet tracer.
A number of different cisco ios ospf configuration commands are available, but at its most basic, ospf configuration uses three commands. I must say it is one of the best tutorial website to. Ospf in detail isp workshops last updated 29 october 20 1. Understanding ospf areas ingrid belosa december 12, 2014 configuration tips 1 comment whether you are preparing for the cisco ip routing exam or you are an experienced network engineer planning to implement the open shortest path first ospf routing protocol, you should familiarize yourself with the capability to divide your network into. Jan 02, 2019 cisco packet tracer tutorial step by step pdf. Before and during this detailed check, you can use the below diagram to remember ospf areas and their specific advertisement acceptance rules. Define area 9 as a totally stubby area area 9 stub nosummary. Eigrp has become a public routing protocol since 20.
How to configure ospf routing protocol and connect areas. And right now were going to take a quick look at some general cisco best practices regarding when bgp should and should not be used. This tutorial explains how to configure ospf routing protocol step by step. The wildcard bits consists of all 0s so all the corresponding bits in the ip address used must match in order for the interface to be running ospf protocol. For basic ospf configuration, the followin scenario will be a good example. Part ii the cisco ios section 10 router components. Ospf adheres to the following link state characteristics. First, configure loopback interfaces to provide stable ospf router ids. Cisco routers derive the router id in one of three ways and with the following precedence. To configure a netowork for ospf properly there are some steps. In my opinion, the cisco switches are the best in the market.
For security purposes, the cisco ios software provides two levels of access to. You should know how to define a routing protocol and understand which protocol is best to use in your network. Routing protocols rip, ospf, bgp interior and exterior routing rip ospf. How to configure ospf in gns3 ospf routing configuration. Then configure the ospf process and enable ospf on the.
The ospf network command uses a combination of networkaddress and wildcardmask. Cisco ios modes of operation the cisco ios software provides access to several different command modes. Ospf employs a hierarchical network design using areas. Cisco open shortest path first ospf provides fast convergence and. In case equal cost paths exist to the same destination, cisco s implementation of ospf will keep track of up to six next hops to the same destination.
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