Global configuration mode, we type in router, and we specify ospf, and now there is this number just sitting there, a 1 in this case. To display ospf configuration information and statistics, see displaying ospf information on page 1029. 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 network type nbma nonbroadcast multiple access uses only unicast communications, so it is the preferred way of ospf configuration in situations where multicast addressing is not possible or desirable for some reasons. Understanding basic open shortest path first routing principles not only applies to the ccnp certification but to all ciscobased certifications. It also uses the spf shortest path first algorithm to determine the best route to its neighbors. Cisco ccnp route implementing a scalable multiarea network ospf based solution. Equalcost multipath allows a router to insert more than one path to a destination in the routing table to enable load balancing. Configuring ospf in a single area ccnp routing studies. Chapter 10 configuring ospf this chapter describes how to configure ospf on the hp procurve 9304m, 9308m, and 6308msx routing switches using the cli and web management interface. In this article i would like to show you about mutual redistribution between eigrp and ospf configuration. 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. In our example, we will examine the figure below deeply.
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. Jul 26, 2017 how to configure basic ospf by brandon carroll in networking on july 26, 2017, 12. Nov 18, 20 i expect that these exercises will give you more understanding of how ospf works and you will feel how is it to configure various features of ospf that are supported on cisco packet tracer. The basic ospf configuration includes ospf on the serial links. The ospf network command uses a combination of networkaddress and wildcardmask. Hi, welcome back to another wonderful cisco networking tutorial. Configuring multiple ospf areas free ccna workbook. Cisco ccnp route implementing ospf cisco ccnp route implementing a scalable multiarea network ospf based solution. To enable ospf for the ports and specify the ospf area id, router priority and metric. Ospf employs a hierarchical network design using areas. If you remember, we discussed link state routing protocols and identified that they require more administration. It is time to take a look to configuring ospf open shortest path first with an ospf configuration example.
The reason we are doing this here, and every other router, is to give us something. Configuring basic mpls using ospf introduction this sample configuration shows how to set up a multiprotocol label switching mpls network for further tasks such as virtual private network vpn or traffic engineering see these sample configurations on. Complete this in a way that the ospf neighbor relationships are not dropped. Ospf configuration how to configure ospf on a network on this page well be looking at. Configure ospfv3 as pece protocol with loop prevention. To the administrator of a large andor complex network, ospf offers several benefits.
Care to know what dynamic cisco routing is for and how to set up ospf in cisco. Heres how ecmp works and how to configure it in ospf. Theres no backup link for area 0 between 26511 and 26512, hence area 2 becomes discontiguous. Configure ospf on a multiaccess network configure ospf priority understand the ospf election process document the ospf configuration scenarios in this lab activity, there are two separate scenarios. May i know how to configure the simple ospf on the juniper switch with cli. Note all router interface ip addresses had been configured appropriately. Learn the basic of how to configure the open shortest path first ospf backbone area area 0 on a cisco router. For more information or to order the book, visit the cisco press web site. Redistribution is the term used to inject routing updates between routers if there are two or more routing protocols enabled in a network or interconnecting two different networks having different routing protocol. To activate ospf on a network, you must enable the protocol on all interfaces within the network on which ospf traffic is to travel.
Ospf will form neighbor relationships with adjacent routers in the same area. To configure an ospf interface as a nonbroadcast interface, you enable the feature on a physical interface or a ve, following the ip ospf area statement, and then specify the ip address of the neighbor in the ospf configuration. However you shouldnt stop with what is described in these two scenarios. Lets take a lab of 4 routers with basic ospf configuration. Configuration with intraarea routing including a sham link ce1 additional backlink ip address add address10. This means that ospf can run on just about any companys. Configuration dospfv2 et ospfv3 en cisco ios cisco. Learn how to configure ospf routing protocol using packet tracer. Mar 21, 2003 cisco ospf command and configuration handbook chapter 14, route redistribution. The router ospf processid command is the beginning of any cisco ios ospf configuration. Just like with other routing protocols covered so far rip, eigrp first you need to. This lab will discuss and demonstrate the configuration and verification of the different ospf network types. Understanding open shortest path first ospf larger networks typically use open shortest path first ospf instead of rip.
Ospf cheat sheet 3 designated router dr backup dr bdr election there are two problems with multiaccess networks. This excerpt is reprinted with permission from cisco press. 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. Learn how to configure multiple ospf areas to segregate the routed network in a hierarchical structure to ease management and conserve router resources. Configuring ospf network types there are multiple ospf network types that can be configured to directly affect the operation of ospf on a specific interface. Ospf in cisco ios january 27, 2015 yvhen hurynovych. This lab will discuss and demonstrate the configuration and verification of perinterface ospf configuration. Each area within an as operates like an independent network and has a unique 32bit area id, which functions similar to a network address. The task is to optimize ospf routing, which creates the need to design and configure multiarea ospf.
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. An area border router abr must have at least one interface in the backbone area, or it must have a virtual link to a router in the backbone area. This article is the fourth in a series of articles covering the basics of cisco networking. Now in our single area ospf it was pretty simple,everybody had the same area. Once you are in the router ospf configuration submode, configure the lan network 172. Posted in cisco, cisco exam prep exercises and labs on november 18. All right folks, here is the moment, the majority of us have been waiting for, configuring a dynamic routing protocol, open shortest path first, or ospf. Ospf default route always many networks need just a default route to reach an uplink router, that has connection to the outside world. Ospf open shortest path first is a popular linkstate routing protocol. Cisco ospf command and configuration handbook is a clear, concise, and complete source of documentation for all cisco iosr software.
Configuration here is the sample configuration on pe routers. It is used to create or modify an existing ospf routing. Although basic ospf configuration can be very simple, ospf provides many extra features that can get really complex. Jan 23, 2017 this week, certified ethical hacker brandon wright shows you how to set up dynamic routing through ospf, and explains several of the benefits to the service. If you have no idea what ospf is or if you are a little fuzzy, i recommend you to read my introduction to ospf first before continuing. Configuring multiarea ospf objective in this lab configure a multiarea ospf operation, interarea summarization, external route summarization, and default routing.
Jun 22, 2017 in this article we will make an example for advanced ospf configuration. Ospf open shortest path first ospf is a standardized linkstate routing protocol, designed to scale efficiently to support larger networks. This tutorial explains how to configure ospf routing protocol step by step with practical example in packet tracer. Use the commands in this chapter to configure and monitor the open shortest path first ospf routing protocol. To display ospf configuration information and statistics, see displaying ospf information on page 1247. The first time it was documented was in 1989 in rfc 11. How to configure basic ospf by brandon carroll in networking on july 26, 2017, 12. Single area ospf configuration with example icnd1 100105.
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. You can see that r1 has learned about the network 192. This time, well take a look how you can configure multi area ospf. Ospf is a standard internal gateway protocol igp that is used by many different types and sizes of companies. Free ccna study guide, tutorials, labs, practice exams. Ospf can scale to the largest lans but can also start out small.
There are two ways to configure ospf on a single interface, the network command in the routing process config mode or through the ip ospf command in interface configuration. Jun 28, 2017 it is time to take a look to configuring ospf open shortest path first with an ospf configuration example. Scenario international travel agency ita maintains a complex ospf environment. Ospf routing has been configured as shown in the network diagram. Above we have r1 and r2 in area 0, the backbone area. How to configure ospf ospf routing protocol configuration ccna ospf in packet tracer. So, lets get on with the configuration dmvpn hub first. Configuring ospf on a network using the topology below. To enable ospf, you must configure one or more interfaces on the. Multiarea ospf configuration with example icnd2 200105.
If you have trouble understanding ospf then you might find my ccna or ccnp book helpful. This configuration includes the vrf configuration, the ospfv3 process 100 that runs between the pece routers, the ospf process 10 that runs as interior gateway protocol igp in the mpls core and the mpbgp configuration for vpnv6 peering. If you remember, we discussed link state routing protocols and. In the first scenario, you will learn how to configure the routing protocol ospf using the network shown in the topology diagram in scenario a. In this article we will make an example for advanced ospf configuration. 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. Redistribution between eigrp and ospf cisco router configuration. We talked about ospf basics and made an ospf configuration for beginners on our course. Ospf networks in an autonomous system as are administratively grouped into areas. In this article we will see how to configure ospf step by step. While ospf can be complex to configure, its basic configuration isnt difficult. First thing we will do is add a loopback interface to the dmvpn hub router.
Ospf configuration issue 1225 the cisco learning network. The nonbroadcast interface configuration must be done on the ospf routers at either end of the link. Chapter 12 configuring ospf this chapter describes how to configure ospf on procurve routing switches using the cli and web management interface. Flooding of this excess lsas would be chaotic itself for the network. Also, the mgre tunnel on the hub router must be set to a ospf broadcast network via the ip ospf network broadcast command. The best way to solve that is with the passiveinterface feature that we see here in router ospf configuration mode. Acx series,t series,m series,srx220,srx650,srx240,srx210,srx110,srx100,srx1400,srx3400,srx3600,srx5600,srx5800,mx series. I try to setup the simple ospf connection between 2 switches. Configuring ospf p1c107 configuring ospf this chapter describes how to configure ospf. Ccna students need to understand how ospf works but also how to configure it. In 2008 free ccna workbook originally started as a sharable pdf but quickly evolved.
This paper examines how ospf works and how it can be used to design and build large and complicated networks. Cisco ospf command and configuration handbook chapter 14, route redistribution. Understanding ospf configurations techlibrary juniper. Ospf adheres to the following link state characteristics. How to configure equalcost multipath in ospf techrepublic. Now, in this situation,this is a very basic multi area lab,but you see that in the greenyou have the backbone router,which is. Ospf configuration step by step guide computernetworkingnotes. Ospf is a standard routing protocol, as defined by rfc2328 and rfc1247. Routing table updates are sent only when a change has occurred only the part of the table that has changed is sent. Apr 10, 2014 in this article i would like to show you about mutual redistribution between eigrp and ospf configuration. Now it is time to go deep and combine virtual link, lsa types and etc. Mar 11, 2017 how to configure ospf ospf routing protocol configuration ccna ospf in packet tracer.
This article will tell you how to configure and experiment with ospf using cisco packet tracer. Below the cisco cli command for the ospf configuration. But were suppressing the ability to use that multicast address of 224. This article takes a look at the configuration of open shortest path first ospf. This lesson explains how to configure ospf multiarea using cisco ios routers. This module describes how to configure open shortest path first ospf. In 2008 free ccna workbook originally started as a sharable pdf but quickly evolved into the largest ccna training lab website on the net. All routes marked with the character o are ospf routes. Redistribution between eigrp and ospf cisco router. This command is executed in privileged mode and displays interface parameters relating to ospf configuration such as network type and hellodead timers. Configuring basic mpls using ospf introduction this sample configuration shows how to set up a multiprotocol label switching mpls network for further tasks such as virtual private network vpn or traffic engineering see these sample configurations on the mpls support page for more information. Ospfv3 for ipv4 configuration ospf has seen quite some changes since it was introduced somewhere in the 1980s. This week, certified ethical hacker brandon wright shows you how to set up dynamic routing through ospf, and explains several of the benefits to the service.
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