Cisco® OSPF Command and Configuration Handbook by William R. Parkhurst

By William R. Parkhurst

As essentially the most predominantly deployed inside Gateway Protocols, Open Shortest course First (OSPF) calls for a wealth of information at the a part of internetworking pros operating with it every day. regrettably, publicly to be had documentation at the OSPF command set varies from being too skinny on insurance to being too hard at the required gear had to try what the documentation covers. Cisco OSPF Command and Configuration guide is a transparent, concise, and entire resource of documentation for all Cisco IOS(r) software program OSPF instructions. how you use this publication is determined by your ambitions. when you are getting ready for the CCIE written and lab tests, then this e-book can be utilized as a laboratory advisor to profit the aim and correct use of each OSPF command. while you are a community clothier, then this e-book can be utilized as a prepared reference for any OSPF command.Cisco OSPF Command and Configuration instruction manual presents instance eventualities that reveal the correct use of each OSPF command that may be applied on a minimal variety of routers. this may assist you research every one command with no requiring an intensive and dear lab configuration. The eventualities truly current the aim and use of every command. many of the examples lead you into universal non-working occasions with the intention to make stronger the certainty of the operation of the actual OSPF command. This e-book is a part of the Cisco CCIE specialist improvement sequence, which deals expert-level guideline on community layout, deployment, and help methodologies to assist networking execs deal with advanced networks and get ready for CCIE tests.

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Additional info for Cisco® OSPF Command and Configuration Handbook

Example text

External networks are networks that have been redistributed into OSPF. External OSPF routes and inter-area OSPF routes are not advertised into a totally stubby area. When an OSPF area is configured as a stub area, a default route will be generated by the ABR into the stub area in place of the external routes. When an OSPF area is configured as a totally stubby area, the default route replaces the external and inter-area routes. The purpose of this command 41 42 is to set the cost of the default route advertised into a stubby, totally stubby, or not-so-stubby area.

2 Suppress hello for 0 neighbor(s) Message digest authentication enabled Youngest key id is 4 The old key and password can now be removed from routers A and B using the no form of the interface command. Troubleshooting Step 1. Before enabling authentication in an OSPF area, verify that there is a neighbor relationship among all OSPF routers by using the show ip ospf neighbor command. Step 2. Verify that authentication has been enabled for every OSPF router with an interface in the area where authentication is being deployed.

Because Area 1 has been defined as an NSSA, the redistributed RIP routes will be advertised into Area 1 as OSPF type 7 routes. Initially, you will configure Area 1 as a normal OSPF area in order to see the routes that are advertised. 255 ! 252 clockrate 64000 ! 255 ! 252 ! 252 lockrate 64000 ! 255 ! 252 ! 252 clockrate 64000 ! 3 area 1 ! 0 ! 0 ! 252 ! 0 no auto-summary Router A is advertising Loopback 0 as an OSPF type 5 external route because this route was injected into OSPF through redistribution.

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