EIGRP Filtering with Offset-list and Delay

EIGRP Offset-list is usually used to increase the metric of routes being advertised over a link, but can it be used to filter EIGRP prefixes?

I thought about using offset-list in RIP to filter specific routes and thought how about doing the same thing in EIGRP? I haven’t run into any examples or blog posts of using Offset-list in EIGRP to filter routes so I thought about labing it out to see if that’s possible. Continue reading

IPv6 ACL Explicit vs Implicit Deny Any Any

Reading the IPv6 Configuration Guide (Implementing Traffic Filters and Firewalls for IPv6 Security), I came across a little known fact that seems to be very important when configuring  IPv6 access-lists on IOS.

Usually when I configured an IPv4 ACL, I explicitly defined a deny ip any any at the end, which seems like the best practice.  But what happens when you do that same thing with IPv6 ACLs.

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The CCIE certification is a very honored and respected industry certification, but it comes at a high cost of time and money.  When I started studying for the certification, I couldn’t find a lot of details on its expense, so I decided to keep a running total.  I wouldn’t say that these numbers are representative of all cases, but only one CCIE.  Knowing these figures helps in terms of budgeting especially when comparing individual financing  versus expensing it from a company training budget.

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CCIE Troubleshooting Lab Tips

Troubleshooting lab is designed for a CCIE candidate to fix an issues of a pre-configured network.  Tickets are very well defined as well as the expected behavior.  There are about 10 tickets presented, some are worth 2 points and some 3 points.  The troubleshooting lab has an automatic cutoff time after 120 minutes.  All devices are virtualized using Cisco’s IOU (IOS on Unix).

The way I approached the troubleshooting section is by reading all of the tickets first.  Yes, that will eat up about 10 minutes of your allocated 120 minutes, but it is well worth it.  During the initial read, I created a table which tracked:

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CCIE Configuration Lab Tips

The CCIE configuration is a 6 hour test.  The main goal of this section is to test you knowledge in building a network from scratch.  All devices are real physical routers and switches, no Cisco IOU.

Similarly to the troubleshooting lab, I read the whole lab from start to finish.  Just as the troubleshooting section I created a table to help me track of all the tasks and its requirements (see below for a sample and explanation).
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CCIE Documentation

The CCIE Routing and Switching test deals with a vast number of technologies.  Remembering everything is rather difficult throughout the preparation process.  Each CCIE will tell you that you need to have some sort of a method of documenting all of this new knowledge.  During my studies I mainly used three types of documentation: mind maps, personal wiki and flashcards.  One other very important aspect of CCIE documentation is the navigation of the DocCD.

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CCIE Written

Before anyone is allowed to schedule the CCIE Lab test, they have to pass the CCIE Written exam 350-001, which is a 120 minute test consisting of 90-110 question (see the link for official blueprint). CCIE candidates usually do either one of these two: take the CCIE written test before doing any workbooks/labs or take the exam before they are ready to schedule the lab test.  I did the latter.  To me it made more sense to configure each topic and have hands on experience, before taking the written test.  I finished the technology based labs and scheduled my written test.  As my main preparation, I used Bosom Exam Environment and utilizing the CCIE written question.  I think Boson has a very useful study tool to review content and fill in any new gaps for their written exam questions.  I passed it on my first attempt.