Archive for December, 2009
In this blog post we are going to discuss some OSPF features related to convergence and scalability. Specifically, we are going to discuss Incremental SPF (iSPF), LSA group pacing, and LSA generation/SPF throttling. Before we begin, let’s define convergence as the process of restoring the stable view of network after a change, and scalability as the property of the routing protocol to remain stable and well-behaving as the network grows. In general, these two properties are reciprocal, i.e. faster convergence generally means less stable and scalable network and vice versa. The reason for that is that faster convergence means that the routing protocol is “more sensitive” to oscillating or “noisy” processes, which in turn makes it less stable.
Benjamin Franklin was quoted as saying “You may delay but time will not“. We may also say that “Email may tolerate delay, but VOIP will not“. Performance Routing (PfR), previously called Optimized Edge Routing (OER), is designed to Continue Reading
As our blog polls reveal, many of you are using Dynamips hardware emulator for your CCIE exam preparations So here are some good news for all you Dynamips-fans – we’ve completed and posted ten our of twenty of IEWB-RS-VOL2 labs adapted to the virtual platform. The remaining ten labs are to be completed and posted by end of January 2010 year. Notice that the Dynamips edition of VOL2 workbook could be purchased separately at a discounted price. However, keep in mind the limitations of the Dynamips platform, which restrict the amount of the features you can implement there. For a complete coverage of all relevant IOS features in full-scale labs format, you may want to choose the regular IEWB-RS-VOL2, which includes the Dynamips edition at no extra charge.
Happy studying and thanks for choosing INE!
We are thrilled to announce our new self-paced product offerings that include CCSP (Cisco Certified Security Professional), CCNA Security (Cisco Certified Network Associate) , and CCNA Voice online classes and videos-on-demand. The new products are designed for those of you pursuing your Professional and Associate level Cisco certifications and looking for complete end-to-end solutions. Developed from the ground up by our industry-recognized multi-CCIE instructors, the new products use our tried and true hands-on learning approach, where in-depth theory lectures are combined with intense practical configuration examples. This unique method of delivery allows you to understand advanced networking technologies and their work in real-world design scenarios, as well as troubleshooting processes. All products are delivered as either online classes or on-demand videos. Every student enrolling into a live class receives the unique chance of interacting with his colleagues and expert instructors and, of course, these live class students receive on-demand class video recordings free of charge.
Please note that in addition to buying just a single product, you have the option of purchasing various product packages. By purchasing any of the value-added packages, you receive an end-to-end solution covering multiple certification tracks. For example, you might purchase CCNA and CCNA Voice, or CCNA and CCVP, or other such packages up to our CCIE Video Training. For detailed information on every product and associated packages, please consult the links below:
Keep in mind that the new products are an addition to our existing and highly acclaimed line of Professional and Associate level training offering that include the following:
Feel free to email our sales team at sales@INE.com or call us at 877-224-8987 to discuss any other options or custom packages that you might want to purchase. Above all, as always, thank you for choosing Internetwork Expert (INE)!
What does RITE and the v4 CCIE blueprint have in common? Section 10.04 If you are new to RITE, or would like to know more about it, read on.
Router IP Traffic Export, (RITE), allows the forwarding of unaltered IP packets from a router interface to memory or to a specific MAC address on a locally attached network. A likely candidate being the MAC address of a network analyzer or Intrusion Detection System. Continue Reading
We know that the Version 4.X CCIE R&S exam features 3 sections – Core Knowledge, Troubleshooting, and Configuration. I notice that many students are forgetting where Cisco might choose to test your Catalyst switch troubleshooting skills and exactly how they might do that…
The only two places in the current exam format where they can test you on this subject are the Core Knowledge and Configuration sections. Notice – NOT the Troubleshooting section.
Remember, the only devices that will be present in your Troubleshooting section are routers (at least until we warn you otherwise). This means, any issues on the Catalyst switches, or caused by the Catalyst switches, will be present in the Configuration section.
So does this mean that most candidates will see a section in the Configuration area that states: 3560 Troubleshooting (4 points)? Well, while this is a possibility, Cisco loves to be a bit creative at times, and they could certainly build in issues to the underlying Layer 2 infrastructure that will rear their head when you are working on Layer 3!
I certainly hope this brief reminder on Version 4 exam strategy helps you!
IPv6 multicast renames IGMP to the Multicast Listener Discovery Protocol (MLP). Version 1 of MLD is similar to IGMP Version 2, while Version 2 of MLD is similar to Version 3 IGMP. As such, MLD Version 2 supports Source Specific Multicast (SSM) for IPv6 environments.
Using MLD, hosts can indicate they want to receive multicast transmissions for select groups. Routers (queriers) can control the flow of multicast in the network through the use of MLD. Continue Reading
CCNA students can typically rattle off the fact that EIGRP uses Bandwidth and Delay in its composite metric calculation by default. In fact, they tend to know this as well as their own last name. But I often notice they might have some pretty big misconceptions about how this metric is really calculated, and how they can manipulate it.
Here are some very important “Core Knowledge” facts that we need to keep in mind about the EIGRP metric: Continue Reading
As many of you know – I am NOT the Dynamips guru around here. For advanced questions on GNS3 and or Dynamips, I immediately direct students to our forum on ieoc.com. That is where all the emulating whiz kids hang out. With that said, I like to have a copy running on every computer I own. While I do not do full practice labs on the platform (I use Graded Labs for that), I love to be able to build little mini-scenarios on the fly whenever I quickly need to test a feature.
Last night I purchased Windows 7 Home Premium and set out to eradicate Windows Vista, doing a “clean install” for the upgrade. I thought I would walk you through the installation of GNS3 on this system as I heard that students have been having issues. Well, here we go (fingers crossed!): Continue Reading