Eigrp Articles

1). Cisco CCNA Certification Exam Tutorial: Variance And Unequal Cost Load Balancing By : Chris Bryant, CCIE #12933
To pass the CCNA exam, you've got to know how to work with IGRP and EIGRP unequal-cost load balancing. You may not see much IGRP in production networks anymore, but you'll see a lot of EIGRP, and part of fine-tuning your EIGRP network is making sure that all paths are in use while allowing for varying bandwidth rates. Using the variance command is the easy part - it's getting the metric that's the hard part with IGRP.
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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 CCNA Exam Tutorial: IGRP And Equal Cost Load Balancing By : Chris Bryant, CCIE #12933
To pass the CCNA exam, you've got to know the role of the bandwidth command with IGRP and EIGRP and when to use it. In this tutorial, we'll configure IGRP over a frame relay hub-and-spoke network using the following networks: R1 (the hub), R2, and R3 are running IGRP over the 172.12.123.0 /24 network. This is a T1 line. R1 and R3 are also connected on a different subnet, 172.
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5). 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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6). Cisco CCNP / BSCI Exam Tutorial: EIGRP Stub Routing By : Chris Bryant
EIGRP stub routing is important for your BSCI exam success, and it can also cut down on unnecessary traffic in your production network. Learn the fundamentals from Chris Bryant, CCIE #12933.
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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 CCNA / CCNP Certification Exam Review: Protocol Basics By : Chris Bryant, CCIE #12933
To earn your Cisco CCNA certification and pass the BSCI CCNP exam, you have to know your protocol basics like the back of your hand! To help you review these important concepts, here's a quick look at the basics of RIPv1, RIPv2, IGRP, and EIGRP. RIPv1: Broadcasts updates every 30 seconds to the address 255.255.255.255. RIPv1 is a classful protocol, and it does not recognize VLSM, nor does it carry subnet masking information in its routing updates.
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9). Cisco CCNA / CCNP Certification Exam Tutorial: Troubleshooting EIGRP By : Chris Bryant, CCIE #12933
Part of earning your CCNA and CCNP - especially passing the difficult CIT exam - is becoming a master network troubleshooter. Today, we'll take a look at troubleshooting EIGRP and spotting common errors. Most adjacency issues are easily resolved - mistyped IP address, bad wildcard mask in the neighbor statement, mistyped EIGRP AS number, and so forth.
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10). Cisco CCNP / BSCI Tutorial: Route Summarization With RIP And EIGRP By : Chris Bryant, CCIE #12933
To pass your BSCI exam and earn your CCNP certification, you've got to master route summarization. When you get to the BSCI level, actually breaking the routes down into binary strings and performing summarization is second nature to you. (If it isn't, get some more practice!) What makes CCNP / BSCI route summarization more difficult is just keeping the different protocol summarization commands straight! RIP and EIGRP both perform route summarization at the interface level with the ip summary-address command.
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11). CCNP Certification / BSCI Exam Tutorial: EIGRP Stuck-In-Active Routes By : Chris Bryant, CCIE #12933
Passing the BSCI exam and earning your CCNP is all about knowing the details, and when it comes to EIGRP SIA routes, there are plenty of details to know. A quick check in a search engine for "troubleshoot SIA" will bring up quite a few matches. Troubleshooting SIA routes is very challengin in that there's no one reason they occur. View the EIGRP topology table with the show ip eigrp topology command, and you'll see a code next to every successor and feasible successor.
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12). 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.
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13). 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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14). Cisco CCNA Exam Tutorial: Split Horizon And Hub-And-Spoke Networks By : Chris Bryant, CCIE #12933
For CCNA exam success, you had better know what split horizon is, how to turn it off, and when to turn it off. Knowing when to turn split horizon off is also important in production networks, because it can cause a hub-and-spoke network to have incomplete routing tables on the spokes. Split horizon exists for a very good reason - routing loop prevention.
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15). Cisco CCNP / BCSI Exam Tutorial: Configuring EIGRP Packet Authentication By : Chris Bryant, CCIE #12933
Configuring RIPv2 and EIGRP authentication with key chains can be tricky at first, and the syntax isn't exactly easy to remember. But for BSCI and CCNP exam success, we've got to be able to perform this task. In a previous tutorial, we saw how to configure RIPv2 packet authentication, with both clear-text and MD5 authentication schemes. EIGRP authentication is much the same, and has the text and MD5 authentication options as well.
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16). 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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17). 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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