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Cisco CCNA Certification Exam Tutorial: OSPF Hub-And-Spoke  by: Chris Bryant, CCIE #12933 CCNA certification demands that you master the basics of OSPF, and for many studying for the CCNA exam, their first exposure to OSPF is a hub-and-spoke configuration. That's a tough way to get started, because a hub-and-spoke configuration built over an NBMA technology such as Frame Relay requires quite a bit of attention to detail. Let's take a quick look at several common OSPF configuration errors and how to avoid them on your CCNA test. Make sure the hub is the designated router and that there are no backup designated routers. This is done by setting the OSPF interface priority to zero on the spoke routers. This not only ensures that the hub wins the DR election with its default OSPF interface priority of 1, but it prevents the spokes from ever having a chance to become the DR or BDR. Configure neighbor statements on the hub. Since we're dealing with an NBMA network, the hub cannot dynamically discover its neighbors. Neighbor statements are not needed on the spokes. (They don't hurt anything, but they don't do anything, either.) Finally, if your OSPF adjacencies do not form as expected, make sure to use your OSI model knowledge to approach the problem. The issue may actually be at Layer Two, with your Frame Relay configuration. If you don't use the "broadcast" option on your frame relay statements, OSPF hellos will not be transmitted successfully between potential neighbors. OSPF hellos are multicast, but the "broadcast" option for Frame Relay includes multicasts. By paying special attention to these details, you're that much close to CCNA exam day success and earning your certification. I recommend that you get some experience with configuring OSPF hub-and-spoke before taking the CCNA exam, because it’s by actually performing tasks such as this that makes you supremely confident on CCNA test day. About The Author Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage (www.thebryantadvantage.com), home of free CCNA and CCNP tutorials, The Ultimate CCNA Study Package, and Ultimate CCNP Study Packages. For a FREE copy of his latest e-books, “How To Pass The CCNA” and “How To Pass The CCNP”, visit the website and download your free copies. You can now get a FREE CCNA and CCNP exam question sent to your email inbox every day! Get your CCNA certification with The Bryant Advantage! chris@thebryantadvantage.com This article was posted on February 17, 2006 Read More Articles from the "Computers and Internet" Category: Where To Find Low Cost Telecommunications / Mobile Phone Products by Jonathan White Microsoft Great Plains security setup – overview for consultant by Andrew Karasev Checklist For Reviving A Dead Computer by Otis F. Cooper Ignoring These Tips Could Result in an Inbox Full of SPAM by Anti Spam League Using Anchor Text Optimization In Your Article Viral Marketing Campaign by Carl Seppanen How to Choose an Internet Service Provider by Ronald Vyhmeister Microsoft C# vs. VB.Net by Andrew Karasev How To Become A Good Halo 2 Sniper by Brendan McCaffery Prospects Offered by the Technology Specialist – BizTalk Server 2006 Certification by Shannon Margolis Elements of Web Hosting by Daniel Punch << Back to "Computers And Internet" Index

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