Cisco router ospf configuration pdf

Ospf configuration step by step guide this tutorial explains how to configure ospf routing protocol step by step with practical example in packet tracer. Ospf configuration guide cisco ios xe 3se catalyst. This tutorial explains how to configure ospf routing protocol step by step with practical example in packet tracer. This paper examines how ospf works and how it can be used to design and build large and complicated networks. According to network diagram, routers r3 is in the area 0. Since these kinds of posts are useful as a reference for many people, i have decided to create also a cisco router commands cheat sheet with the most useful and the most frequently used command line interface cli configuration commands for cisco routers. All ospf protocol exchanges can be authenticated so that only trusted routers. Ospf will form neighbor relationships with adjacent routers in the same area. 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.

Configuring route summarization when redistributing routes into ospf 19. Ospf inbound filtering using route maps with a distribute list. Cisco ios router configuration commands cheat sheet pdf. Thus, if a router with a higher priority is added to the network, it will not automatically supplant an existing dr. In a previous post, i have published a cisco switch commands cheat sheet tutorial. Just like with other routing protocols covered so far rip, eigrp first you need to enable ospf on a router. Basic ospf configuration for internal router abr and asbrs 42. Implications of configuring ospfv2 on a router basis or an interface basis 14. The ospf mib defines an ip routing protocol that provides management information related to ospf and is supported by cisco routers. Router4 connects to both areas that is area 0 and area 2, which makes him an area border router, while router5 is in area 2 router r3 and r5 configuration are same as we learn in above single area configuration lab but configurations of router r4 is as followi.

In the following example, the output for the show ip ospf and show ip ospf database nssa commands shows an open shortest path first notsostubby area ospf nssa area where rfc 3101 is disabled, rfc 1587 is active, and an nssa area border router abr device is configured as a forced nssa lsa translator. Ospf adheres to the following link state characteristics. Ospf configuration guide americas headquarters cisco systems, inc. Configure ospf router ids the ospf router id is used to uniquely identify the router in the ospf routing domain.

The ospf mib defines an ip routing protocol that provides management information related to ospf and is supported by. Configuring route summarization when redistributing routes into ospf 23. Basic ospf configuration for internal router abr and. Ospf employs a hierarchical network design using areas. 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. Configuring route summarization when redistributing routes into ospf 21. Since these kinds of posts are useful as a reference for many people, i have decided to create also a cisco router commands cheat sheet with the most useful and the most frequently used command line interface cli configuration commands for cisco routers cisco ios routers are probably the most complete. This module describes how to configure open shortest path first ospf. Cisco router configuration commands cli cheat sheet in a previous post, i have published a cisco switch commands cheat sheet tutorial. Protocol igp developed by the ospf working group of. Ip address configured with the ospf routerid command. Describe the onze pdf function and operation of packets in ospf routing. To do that, the following configuration on r1 will be used because r1 connects only to r2, we only need to establish a neighbor relationship with r2 and advertise directly connected subnet into ospf. Cisco routers derive the router id in one of three ways and with the following precedence.

Configure the router identifiers for the devices in your ospf network. In this example we have two ospf areas that is area 0 and area 2. Ospf configuration, the router sends a notification message to the console stating that a neighbor relationship with another ospf router has been established. Configuration ospf routeur cisco pdf this of course leads to more complexity in the configuration and troubleshooting of ospf networks. This is done by using the router ospf processid global configuration command. Once you are in the router ospf configuration submode, configure the.