Configuring the ospf routing process objective setup an ip addressing scheme for ospf area 0. These tasks can be split into two general categories. If youve completed the labs in the free ccna workbook up until this point then boy youre in for a real treat. This module describes how to implement ospf on cisco asr 9000 series aggregation services routers. This article takes a look at the configuration of open shortest path first ospf. This topic includes a sample configuration file for the ospf routing daemon.
In 2008 free ccna workbook originally started as a sharable pdf but quickly evolved into the largest ccna training lab website on the net. Verifying an ospf configuration, tracing ospf protocol traffic, example. Verifying and monitoring ospf configuration techlibrary. Cisco vpn solutions center configuration file examples. Jun 28, 2017 it is time to take a look to configuring ospf open shortest path first with an ospf configuration example. Ospf configuration guide, cisco ios release 15sy americas headquarters cisco systems, inc. Ospf configuration guide cisco ios xe 3se catalyst 3850. For protocolindependent features, see the chapter configuring ip routing protocol. 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. Open shortest path first configuration in cisco packet tracer duration. Ccie, william r download it once and read it on your kindle device, pc, phones or tablets. Configure and verify open shortest path first ospf routing. Readers of this document should be familiar with basic concepts of ospf routing protocol. Sample configuration for authentication in ospf cisco.
This tutorial explains how to configure ospf routing protocol step by step with practical example in packet tracer. In lab 91 configuring basic ospf you learned about stub areas and their. Highest ip address of any of the routers loopback addresses. Cisco ospf configuration commands for checking adjacency, dr bdr election and stub area. This paper examines how ospf works and how it can be used to design and build large and complicated networks. The information in this document is based on these software and hardware versions. Generatingadefaultroute24 configuringlookupofdnsnames25 forcingtherouteridchoicewithaloopbackinterface25 controllingdefaultmetrics26. Sample show output commands used in the configuring basic mpls using is.
Vrfs are like vlans for routers, instead of using a single global routing table we can use multiple virtual routing tables. In the following example, an open shortest path first ospf stub network is configured to include ospf area 0 and ospf area 1, using five devices. This lab will discuss and demonstrate the configuration and verification of ospf stub areas. Ospf adheres to the following link state characteristics. In our example, we will examine the figure below deeply. Ospf will form neighbor relationships with adjacent routers in the same area. Each area within an as operates like an independent network and has a unique 32bit area id, which functions similar to a network address.
May 04, 2019 configuration ospf routeur cisco pdf this of course leads to more complexity in the configuration and troubleshooting of ospf networks. We talked about ospf basics and made an ospf configuration for beginners on our course. Hope this article will help every beginners who are going to start cisco lab practice without any doubts. Commands used in the configuring basic mpls using is. Once you are in the router ospf configuration submode, configure the lan network 172. Implementing ospf on cisco asr 9000 series routers cisco. Open shortest path first ospf is a routing protocol for ip. For all packet tracer examples and files, you can check packet tracer labs page. Oct 20, 2016 the cost of the default route now includes the external cost 1 and the internal ospf cost 10 for a total of 11. Ospf employs a hierarchical network design using areas. Ospf nssa area with rfc 3101 disabled and rfc 1587 active 38.
Any use of actual ip addresses or phone numbers in illustrative content is. The cisco implementation of tcp header compression is an adaptation of a program developed by the university of. Cisco vpn solutions center configuration file examples this chapter provides several examples of configuration files used to provision vpn solutions center. Stub areas support multiple features that can reduce router resources and simplify configurations. Ospf nssa area with rfc 3101 disabled and rfc 1587 active 40. Ospf is a widely used protocol in service provider environments. The ospf network command uses a combination of networkaddress and wildcardmask.
The website was founded in late 2009 with the goal of providing free cisco ccna labs that can be completed using the gns3 platform. This is not true in some cases, for example, because of cost constraints or when you have only a partially meshed network. Ospf basic configuration ospf basic configuration pearson. The following sample configuration accomplishes several tasks in setting up an abr. Ospf nssa area with rfc 3101 disabled and rfc 1587 active 42. Each interface of the router is assigned to a different vrf. 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. Open shortest path first ospf is an interior gateway protocol igp developed by the ospf working group of the internet engineering task force ietf. How to configure ospf routing in cisco packet tracer. Ospf networks in an autonomous system as are administratively grouped into areas. With this eigrp config, we will see important eigrp commands on cisco packet tracer.
You can also use the ip ospf authentication command under the interface to configure plain text authentication for the interface. A linkstate protocol makes routing decisions based on the states of the links that connect source and destination machines. Cisco routers derive the router id in one of three ways and with the following precedence. This time, well take a look how you can configure multi area ospf.
Because of the limited numbers of commands available on packet tracer, we will practice a very basic configuration for our bgp config example. Cisco ospf command and configuration handbook ccie. Stub areas are another way of building a scalable ospf network. This of course leads to more complexity in the configuration and troubleshooting of ospf. Ospf nssa area with rfc 3101 disabled and rfc 1587 active 39. Implications of configuring ospfv2 on a router basis or an interface basis 14. Refer to the open shortest path first documentation for information on ospf routing protocol. The configuration of eigrp is similar to other routing protocols.
Ospf is a standard internal gateway protocol igp that is used by many different types and sizes of companies. The router ospf processid command is the beginning of any cisco ios ospf configuration. Example advertisement until routing tables converge. Any internet protocol ip addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Eigrp enhanced interior gateway routing protocol, is a cisco proprietary hybrid routing protocol.
How to configure basic ospf by brandon carroll in networking on july 26, 2017, 12. Sample configuration for authentication in ospf document id. Bgp configuration packet tracer bgp config example ipcisco. Configuration example setting the ospf metric type for a. Ospf can scale to the largest lans but can also start out small. Ospf ospf is the industry standard in internal dynamic routing protocols and its supported on nearly all vendor platforms.
Ospf routing loopsuboptimal routing between cisco ios and nxos for external routes configuration example 02jul2014 ospf type5 route calculation configuration example 05mar2015 configuration example of mpls l3vpns with isis remote lfa 24oct2016. Verify that there is a neighbor relationship between the ospf routers using theshow ip ospf neighbors command. The open shortest path first ospf protocol, defined in rfc 2328, is an interior gateway. Link state routing protocols advertise the state of their links. Open shortest path first open shortest path first ospf is an openstandard link state routing protocol. Eigrp and troubleshooting routing protocols objectives upon completion of this chapter, you should be able to answer the following questions. 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. A number of different cisco ios ospf configuration commands are available, but at its most basic, ospf configuration uses three commands. 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. To understand bgp border gateway protocol better, we will make a basic packet tracer bgp configuration example. Aug 03, 2007 ospf routing using ip unnumbered provisioning.
Ip routing configuration examples and technotes cisco. Cisco ospf command and configuration handbook ccie professional development kindle edition by parkhurst ph. While ospf can be complex to configure, its basic configuration isnt difficult. In this example, we will configure eigrp on packet tracer. Configuration examples for ospf ttl security check and ospf graceful. How to configure pat on cisco ios router i have covered the configuration of static nat and dynamic nat in previous lessons, now its time for pat. Basic ospf configuration route redistribution the specific tasks outlined in this configuration are detailed briefly in the following descriptions.
If using thealways form of the command, then this command should work as expected. Device 3 is configured as the nssa autonomous system border router asbr. Configuration examples of ospf stub router advertisement 56. The area authentication command in the configuration enables authentication for all the interfaces of the router in a particular area. The goal of this article is to give an easy way to understand the cisco ospf configuration examples. Now it is time to go deep and combine virtual link, lsa types and etc. 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. Configuration ospf routeur cisco pdf this of course leads to more complexity in the configuration and troubleshooting of ospf networks. Ip address configured with the ospf routerid command. This configuration file provides an example of using the open shortest path first ospf protocol on the pece link, and using ip unnumbered provisioning from the pe to ce1. Ospf allows 5 different area types, which provides flexibility, fast convergence and scalability. It is a linkstate protocol, as opposed to a distancevector protocol.
In this topology, 2 cisco catalyst 295024 switches and 6 pcs are used. This article is the fourth in a series of articles covering the basics of cisco networking. 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. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. You can download the cisco packet tracer example with.
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. Now a days the majority of the network setups use this protocol. Above we have r1 and r2 in area 0, the backbone area. Ospf open shortest path first ospf is a standardized linkstate routing protocol, designed to scale efficiently to support larger networks. Jun 22, 2017 in this article we will make an example for advanced ospf configuration. To use any of the dynamic routing protocols with fireware xtm, you must import or copy and paste a configuration file for the dynamic routing daemon. In this article we will see how to configure ospf step by step. Routing configuration guide, cisco ios xe release 17. In cisco ios xr software, ospf areas must be explicitly configured, and interfaces configured under the area configuration mode are explicitly bound to that area. Configuring basic mpls using ospf to illustrate this sample configuration, look at a particular destination, for example 10. Sample configuration for authentication in ospf sample. You upload the csv file when you attach a cisco sdwan device to a device template. The ip addresses and network device names included in these examples are generic and are not intended to be used in your network.
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