Ospf Articles

1). Cisco CCNP / BSCI Exam Tutorial: OSPF Route Redistribution Review By : Chris Bryant, CCIE #12933
OSPF route redistribution is an important topic on the BSCI exam, and it's a topic full of details and defaults that you need to know for the exam room and the job. To help you pass the BSCI exam, here's a quick review of some of the OSPF route redistribution basics. To see if a router is an ABR or ASBR, run show ip ospf. This also displays any routes being redistributed into OSPF on this router.
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2). Cisco CCNA Exam Tutorial: Route Summarization By : Chris Bryant, CCIE #12933
Preparing to pass the CCNA exam and earn this important Cisco certification? Route summarization is just one of the many skills you'll have to master in order to earn your CCNA. Whether it's RIP version 2, OSPF, or EIGRP, the CCNA exam will demand that you can flawlessly configure route summarization. Route summarization isn't just important for the CCNA exam.
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3). Cisco CCNP / BSCI Exam Tutorial: The Passive Interface Command And OSPF By : Chris Bryant, CCIE #12933
To pass the BSCI exam and become a CCNP, you have to be aware of the proper use of passive interfaces. You learned about passive interfaces in your CCNA studies, but here we’ll review the basic concept and clear up one misconception regarding passive interfaces and OSPF. Configuring an interface as passive will still allow the interface to receive routing updates, but the interface will no longer transmit them.
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4). Cisco CCNP / BSCI Exam Tutorial: Using The OSPF Command “Area Range” By : Chris Bryant, CCIE #12933
Your BSCI and CCNP exam success depends on knowing the details, and one such detail is knowing the proper way to summarize routes in OSPF. Route summarization is not just a test of your binary conversion abilities, but knowing where and when to summarize routes. It will not surprise any CCNA or CCNP certification candidate that OSPF gives us the most options for route summarization, and therefore more details to know! OSPF offers us two options for route summarization configurations.
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5). Cisco CCNA / CCNP Certification: OSPF E2 vs. E1 Routes By : Chris Bryant, CCIE #12933
OSPF is a major topic on both the CCNA and CCNP exams, and it's also the topic that requires the most attention to detail. Where dynamic routing protocols such as RIP and IGRP have only one router type, a look at a Cisco routing table shows several different OSPF route types. R1#show ip route Codes: C - connected, S - static, I - IGRP, R - RIP, M -.
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6). Cisco CCNP / BSCI Exam Tutorial: EIGRP Route Summarization By : Chris Bryant, CCIE #12933
Summarizing routes is a vital skill to learn to pass the BSCI exam and get one step closer to earning your CCNP. The actual binary conversions are only part of the test, though! You've got to know how to correctly apply the summary routes, and that differs from one protocol to the next. In the last few CCNP / BSCI tutorials, we've looked at using the "area range" and "summary-address" commands to perform OSPF route summarization.
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7). Cisco CCNA / CCNP Exam Tutorial: Five Debugs You Must Know By : Chris Bryant, CCIE #12933
To pass the BSCI exam and move one step closer to CCNP certification success, you've got to know how and when to use debug commands to troubleshoot and verify network operations. While you should never practice debug commands on a production network, it's important to get some hands-on experience with them and not rely on "router simulators" and books to learn about them.
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8). Cisco CCNP / BSCI Exam Tutorial: Using OSPF's "Summary-Address" Command By : Chris Bryant, CCIE #12933
BSCI exam success, not to mention earning your CCNP, can come down to your OSPF route summarization skills. There are a few different commands and situations you need to be ready for, and one of these situations is the proper use of the "summary-address" command. The summary-address command should be used on an ASBR in order to summarize routes that are being injected into the OSPF domain via redistribution.
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9). CCNP / BSCI Exam Tutorial: Route Summarization And The OSPF Null Interface By : Chris Bryant, CCIE #12933
CCNP exam success, particularly on the BSCI exam, demands you understand the details of route summarization. This skill not only requires that you have a comfort level with binary conversions, but you have to know how and where to apply route summarization with each individual protocol. You also have to know the "side effects" of route summarization.
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10). 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.
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11). Cisco CCNP / BSCI Certification: Route Redistribution And The Seed Metric By : Chris Bryant, CCIE #12933
In the first part of this free CCNP / BSCI tutorial, we looked at how leaving one simple word out of our route redistribution configuration - "subnets" - resulted in an incomplete routing table when redistributing routes from RIP to OSPF. (If you missed that part of the tutorial, visit my website's "Free Tutorials" section.) Today, we'll look at redistributing OSPF routes into RIP and identify another common redistribution error.
Article Related to: ccnp, bsci, exam, route, redistribution, ospf, rip, seed, metric, routing, table, subnet

12). Cisco CCNP / BSCI Tutorial: The Role Of The OSPF ASBR By : Chris Bryant, CCIE #12933
To pass the BSCI exam and earn your CCNP certification, you've got to master the (many) details of OSPF. You might have thought there were quite a few OSPF details in your CCNA studies, but you'll now build on that foundation on the way to earning your CCNP. One such detail is the role of the Autonomous System Border Router (ASBR) in OSPF. The name.
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13). Cisco CCNP / BSCI Certification: Troubleshooting Route Redistribution, Part I By : Chris Bryant, CCIE #12933
If there's one CCNP / BSCI topic that looks so easy but can lead to a real headache, it's route redistribution. I'm not even talking about the routing loops and suboptimal routing that can result when route redistribution is done without proper planning - I'm talking about the basic commands themselves. Leaving out one single command option, or forgetting what else needs to be redistributed when redistributing dynamically discovered routes, can leave you with a routing table that looks complete but does not result in full IP connectivity.
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14). Cisco CCNA Exam Tutorial: Five OSPF Hub-And-Spoke Details You Must Know! By : Chris Bryant, CCIE #12933
CCNA exam success depends greatly on knowing the details, and if there's one protocol that has a lot of details, it's OSPF! This is true particularly of hub-and-spoke networks, so in this CCNA OSPF tutorial we'll take a look at some of the more important hub-and-spoke OSPF details. This will help you in working with real-world networks as well, since this OSPF network type is one of the more typical network topologies.
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15). Cisco CCNP / BSCI Certification Exam: Five OSPF Details You Must Know By : Chris Bryant
When it comes to the BSCI exam, you have to master a great many details to pass! Learn about five vital but overlooked OSPF details from Chris Bryant, CCIE #12933.
Article Related to: ccnp, cisco, exam, certification, bsci, ospf, stub, total, area, default, route, virtual, link, auth

16). Cisco Routing For The CCNA And CCNP: Administrative Distance By : Chris Bryant, CCIE #12933
The textbook definition of "administrative distance" is simple enough: "the measurement of a protocol's believability". It's not enough to know the definition, however you've got to know when AD comes into the picture and when it does not. When a packet needs to be routed, the router looks in its routing table for the next-hop IP address the packet should take to get to the destination.
Article Related to: ccna, ccnp, cisco, exam, pass, administrative distance, ad, study guide, nat, rip, ospf, eigrp, routing table

17). Cisco CCNP / BSCI Exam Tutorial: Route Summarization By : Chris Bryant, CCIE #12933
Preparing to pass the BSCI exam and earn your Cisco CCNP? Route summarization is just one of the many skills you'll have to master in order to earn your CCNP. Whether it's RIP version 2, OSPF, or EIGRP, the BSCI exam will demand that you can flawlessly configure route summarization. Route summarization isn't just important for the BSCI exam. It's a valuable skill to have in the real world as well.
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18). Cisco CCNP Certification / BSCI Exam Tutorial: Floating Static Routes By : Chris Bryant, CCIE #12933
Passing the BSCI exam and earning your CCNP certification demands that you add greatly to the networking skills foundation you created when you studied for your CCNA certification. You learned quite a bit about static routing and default static routing when you passed the CCNA test, and it does seem like that should be all you need to know about static.
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19). Cisco CCNP / BSCI Certification: Introduction To ISIS Terminology By : Chris Bryant, CCIE #12933
When you're studying to pass the BSCI exam and earn your CCNP certification, you're going to be introduced to ISIS. ISIS and OSPF are both link-state protocols, but ISIS works quite differently from OSPF. You must master these details in order to earn your CCNP. One of the major differences between OSPF and ISIS will be evident to you when you first begin your BSCI exam studies, and that is the terminology.
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20). Cisco CCNP / BSCI Exam Tutorial: Configuring And Troubleshooting OSPF Virtual Links By : Chris Bryant, CCIE #12933
Knowing when and how to create an OSPF virtual link is an essential skill for BSCI and CCNP exam success, not to mention how important it can be on your job! As a CCNA and CCNP candidate, you know the theory of virtual links, so let's take a look at how to configure a virtual link, as well as some real-world tips that many CCNA and CCNP study guides leave out! In this configuration, no router with an interface in Area 4 has a physical interface in Area 0.
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21). Cisco CCNP Certification / BSCI Exam Tutorial: Route Summarization Basics By : Chris Bryant, CCIE #12933
As you earn your CCNA and CCNP certification, you're going to have to get comfortable with manually summarizing routes. This isn't just another reason to learn binary math (although it's a good one!), but summarizing routes is a true real-world skill that can help your network operate more efficiently. So the question isn't just how to summarize routes, it's why.
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22). Cisco CCNP / BSCI Exam Tutorial: OSPF Router Types By : Chris Bryant, CCIE #12933
When you're preparing to pass the BSCI exam on the way to the coveted Cisco CCNP certification, you can be quickly overwhelmed by the sheer amount of BGP and OSPF knowledge you must demonstrate a mastery of. One set of details that some BSCI and CCNP candidates underestimate are the differences between the OSPF router types. An OSPF Internal router has one rule - it must have all its interfaces in a single area.
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23). Cisco CCNA Certification Exam Tutorial: The OSPF RID By : Chris Bryant, CCIE #12933
OSPF is a major topic on your CCNA exam, as well it should be. OSPF is a widely-used WAN protocol, and you need to learn the fundamentals before moving on to more complicated configurations. One such detail is the OSPF Router ID, or RID. The RID is the dotted decimal value by which other OSPF routers will identify a given OSPF router. There are some interesting defaults for this value, and a command you should know to hardcode the RID.
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24). Cisco CCNP / BSCI Tutorial: Comparing OSPF and ISIS Hellos By : Chris Bryant, CCIE #12933
While studying to pass the BSCI exam and preparing to earn your CCNP certification, you'll quickly notice that while OSPF and ISIS are both link-state protocols, there are a lot of differences between the two. One major difference is the way the two protocols handle hello packets. Hello packets are imperative to keeping OSPF and ISIS adjacencies alive.
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25). Cisco CCNA Certification: Broadcasts, Unicasts, And Multicasts By : Chris Bryant, CCIE #12933
When you begin your CCNA studies, you get hit with a lot of different networking terms right away that you might not be familiar with. What makes it a little more confusing is that a lot of these terms sound a lot alike. Here, we're going to discuss the differences between broadcasts, multicasts, and unicasts at both the Data Link (Layer 2) and Network (Layer 3) layers of the OSI model.
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