Ospf configuration example cisco pdf

Ospf configuration in packet tracer computer networking. Configure ospf on the r3 router using the router ospf and network. The following example shows how to define authentication on a vlan interface of the cisco asr 901 series router. This document describes ip unicast routing configurations supported by the switch, including the principle and configuration procedures of ip routing overview, static route, rip, ripng, ospf, ospfv3, isisipv4, isisipv6, bgp, routing policy,and pbr, and provides configuration examples. But just before we get to configure, lets have an overview of 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. In this case, cisco ios software will invert the subnet mask and the wildcard mask will be entered into the running configuration. For ospf configuration information and examples, refer to the configuring ospf chapter of the network protocols configuration guide, part 1.

Create one loopback interface in both routers and configure ip address. The requirement is that the igp protocol ospf is publishing the routing information for all these loopbacks addresses in the ospf domain. Enable ospf routing, which places you in router configuration mode. Routing configuration example viptela documentation. Ospf configuration guide americas headquarters cisco systems, inc. Create separate ospf templates for the two ospf routing types. Device 3 is configured as the nssa autonomous system border router asbr.

In our example, we will examine the figure below deeply. Ospf nssa area with rfc 3101 disabled and rfc 1587 active 50. Download this cisco router configuration commands cheat sheet in pdf format at the end of this post herethe most important cli commands are included that will help you in the field. To configure eigrp only on interface fa00, the network 10. A number of different cisco ios ospf configuration commands are available, but at its most basic, ospf configuration uses three commands. Areas have to be connected to the backbone area but if they arent we can fix it with a virtual link. This time, well take a look how you can configure multi area ospf. 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. Cisco ios router configuration commands cheat sheet pdf. Ospf nssa area with rfc 3101 disabled and rfc 1587 active. 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.

For configuring ospf and advertising networks use the same commands mentioned in exercise 1. Ospf cisco configuration ospf open shortest path first protocol is a wellknow routing protocol that is widely used today. In this article we will see how to configure ospf step by step. How to configure ospf on cisco asa firewall example with. How to configure ospf routing protocol using cisco packet tracer. Link state routing protocols advertise the state of their links. To understand bgp border gateway protocol better, we will make a basic packet tracer bgp configuration example. As expected r4 is elected as dr because its router id is the highest among these routers. First use ip ospf messagedigestkey x md5 to specify the key number and a password. Open shortest path first ospf is one of the dynamic routing protocols amongst others such as eigrp, bgp and and rip. This branch network is running ospf, and ospf automatically redistributes its learned intraarea and interarea routes to the vsmart controller. 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. Now it is time to go deep and combine virtual link, lsa types and etc.

Second step is to configure the ospf router id of the other abr. Jul 26, 2017 how to configure basic ospf by brandon carroll in networking on july 26, 2017, 12. Jun 22, 2017 in this article we will make an example for advanced ospf configuration. To configure ospf on a router, there are two steps. How to configure basic ospf by brandon carroll in networking on july 26, 2017, 12. How to configure ospf authentication letsconfig 4 methods. If you studied cisco s ccna you have learned that when you use ospf all the areas have to be directly connected to the backbone area.

For basic ospf configuration, the followin scenario will be a good example. Ospf allows for the transfer and tagging of external routes injected into an autonomous system. The combined use of ospf and bgp allows for a divide and conquer approach. 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. Download cisco ccnp routing pdf study guide snabay networking. Authenticate adjacencies with md5 ip ospf authentication messagedigest. Below output shows the adjacency states and the elected drbdr for the above topology. Totally stubby area permits type 1 and 2 lsas while blocking types 3457 lsas.

This keeps track of external routes injected by exterior protocols such as bgp. 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. Use the router ospf command in global configuration mode to enable ospf on the r1 router. This document cover basic ospfv3 connectivity, ospfv3 authentication and ospfv3 configuration using flex cli on ios xr. Jun 28, 2017 it is time to take a look to configuring ospf open shortest path first with an ospf configuration example. As was described in chapter 2, the wildcard mask for ospf can also be entered in the same format as a traditional subnet mask, for example, network 10. How to configure ospf on cisco asa firewall example config and troubleshooting cisco adaptive security appliance asa is quite a versatile device integrating applicationaware firewall, ssl and ipsec vpn, intrusion prevention system ips, antivirus, antispam, antiphishing, and web filtering services. 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. Enter a process id of 1 for the processid parameter.

Then configure the console, virtual terminal lines password both cisco and. In this document you will see basic ospv3 configuration on asr9k. Ospf can scale to the largest lans but can also start out small. Ospf is a classless protocol, and thus supports vlsms. Dec 23, 2019 ip ospf multiarea 99 ip ospf 1 area 0 end.

The router ospf processid command is the beginning of any cisco ios ospf configuration. Ospf with multiarea adjacency configuration example cisco. Ospf configuration step by step guide computernetworkingnotes. Home downloads download cisco ccnp routing pdf study guide. This tutorial will give you an easy guide of configuring basic ospf on a cisco router. Tsas receive a single type 3 lsa containing a default route to the abr. To configure a netowork for ospf properly there are some steps. Just following the original config will not give you ospf routes, because ospf will only announce 1. Bgp configuration packet tracer bgp config example ipcisco. Ospf uses the dijkstra shortest path first algorithm to determine the shortest path. For protocolindependent features, see the chapter configuring ip routing protocolindependent. This type of stub area is an extension to ospf created by cisco. While ospf can be complex to configure, its basic configuration isnt difficult. Keep this in mindyou need to configure the ospf router id and not the ip address of the abr.

Configure ospf in two routers and check adjacency state, routing table and lsdb. You can use real cisco devices or any other network simulator software for following this guide. We talked about ospf basics and made an ospf configuration for beginners on our course. Ospf basic configuration ospf basic configuration pearson. For ospf configuration information and ex amples, refer to the con figuring ospf chapter of the network protocols configuration guide, part 1.

Ospf commands use the commands in this chapter to configure and monitor the open shortest path first ospf routing protocol. Above we have r1 and r2 in area 0, the backbone area. In this lesson well take a look how to configure ospf on a dmvpn phase 3 network. This of course leads to more complexity in the configuration and troubleshooting of ospf networks. Configure the network statement for the lan network. Open shortest path first open shortest path first ospf is an openstandard link state routing protocol. We also want to advertise ospf external routes to the vsmart controller. Ospf configuration step by step guide this tutorial explains how to configure ospf routing protocol step by step with practical example in packet tracer.