Area 56 and area 1011 should not accept type 4 or 5 lsas. Link state routing protocols advertise the state of their links. This command is executed in router configuration mode of rip, eigrp or ospf to configure the routing process to redistribute routes from a different source into the configured routing process such as static into rip or rip into ospf. Ospf concepts and configuration things to remember about link state routing link state protocols advertise a large amount of topological information about the network tells what every metric is for every link in the network routers must calculate the metric using shortest path first algorithm. A stub area is configured to prevent as external link advertisements type 5 being flooded into the stub area. Ospf will form neighbor relationships with adjacent routers in the same area. However, this tutorial has increased my level of practical experience. The rip requests the routing table from different neighboring devices of the router that uses rip. Ospf open shortest path first ospf is a standardized linkstate routing protocol, designed to scale efficiently to support larger networks. With ospf it is no problem to configure a default route. Lab 102 configuring mutual ospf and rip redistribution, then you should have a basic understanding of mutual route redistribution.
If not then to summarize it all up for you in a pretty little nut shell. Ospf has become one of the most widely used protocols in existence today because of being able to implement it cross multivendor platforms. Difference between rip and ospf difference between. Configuring ospf routing advanced lab continued ospf objectives. If routerid has changed, a restart of the ospf process is necessary. Chapter routing protocols rip, ospf, and bgp pdf created with fineprint pdffactory pro trial version. If you arent sure what a vrf is, or how it works, check out my previous post about vrflite. 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.
Redistribute these static routes into the ospf process. This can be done with the clear ip ospf process command. What is open shortest path first ospf definition from. Ospf open shortest path first is an open standard routing protocol. It uses a link state routing lsr algorithm and falls into the group of interior gateway protocols igps, operating within a single autonomous system as. A free powerpoint ppt presentation displayed as a flash slide show on id. Remote work advice from the largest allremote company. It is defined as ospf version 2 in rfc 2328 1998 for ipv4. In ciscos implementation ospf will choose a loopback interface with the highest ip configured as routerid, if no loopback is available it will pick the highest ip of normal interfaces. Since it is based on open standard, we can use it with any vendors router. We can change the metric or metric type but the most important thing most people forget is the always keyword.
Cisco ospf configuration guide open shortest path first. Cli to configure interface ethernet3 on the screenos firewall to form the adjacency with the upstream router running ospf in area 0. Pdf introduction au routage dynamique avec ospf cours et. As long as a network is ipbased, the ospf algorithm will calculate the most efficient way for data to be transmitted.
Area 123 and area 8 should not accept type 3, 4, or 5 lsas. There are a couple of options if you want to do this. Ospf concepts and configuration things to remember about link state routing link state protocols advertise a large amount of topological information about the network tells what every metric is for every link in the network routers must calculate the metric using shortest path first algorithm routers perform cpu intensive computations on the data. 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. Check your routing tables to ensure these routes have propagated. By default ospf will advertise all the user vlan subnet addresses in the router lsa linkstate advertisement. Basic ospf stub area a stub area is an area which is out on a limb with no routers or areas beyond it. Later, the router consolidated that information and constructs its. Ospf in detail isp workshops last updated 29 october 20 1. Ppt ospf powerpoint presentation free to download id. Ospf is a link state open standard based routing protocol. It always chooses shortest path to the subnetwork first. Configure ospf to summarize these redistributed routes into a single route.
We should keep in mind that the ospf is a better one to find the shortest routing paths between devices in a network. Mikrotik routeros implements ospf version 2 rfc 2328. Configuration du routage dynamique rip ospf routage. Apr 02, 2014 2 thoughts on cisco ospf configuration guide open shortest path first winnie andrias march 27, 2016. Configuring ospf p1c107 configuring ospf this chapter describes how to configure ospf. With the above command, any user vlan subnet matching 75. The ospf protocol is the linkstate protocol that takes care of the routes in the dynamic network structure that can employ different paths to its subnetworks. Open shortest path first ospf is a routing protocol for internet protocol ip networks. For a complete description of the ospf commands in this chapter, refer to the ospf commands chapter of the network protocols command reference, part 1. Resume sur le cours introduction au routage dynamique avec ospf. 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. To control the ospf advertisement, execute the following command. Ospf employs a hierarchical network design using areas.
Open shortest path first ospf is a link state routing protocol lsrp that uses the shortest path first spf network communication algorithm dijkstras algorithm to calculate the shortest connection path between known devices. Ospf adheres to the following link state characteristics. The popularity of ospf is continuing to grow with the advent of multi protocol label switching mpls. Configure ospf md5 authentication throughout your ospf domain. Above we have r1 and r2 in area 0, the backbone area. Enable ospf configuring ospf p1c109 enable ospf as with other routing protocols, enabling ospf requires that you create an ospf routing process, specify the range of ip addresses to be associated with the routing process, and assign area ids to be. The benefits of configuring a stub area are that the size of the link state data base. Introduction au routage dynamique avec ospf cours en pdf. Par defaut, une interface ne peut appartenir qua une zone ospf. Oct 17, 2014 dans cette video, nous allons apprendre comment configurer le protocole ospf sous packet tracer. Ospf is a method of finding the shortest path from one router to another in a local area network lan. Archive screenos configuring ospf on firewall juniper. Routage dynamique avec ospf il y a une legere difference en ipv6.
1315 1158 730 373 106 98 1037 1488 1263 1063 166 1407 391 1179 305 591 114 138 443 396 855 259 1345 49 1064 632 1476 454 1038 416 396 1509 466 30 511 943 982 828 673 824 1491 457 873 1433