Tag:   Routing Loops

This post represents the solution and explanation for quiz-24. It shows that using always option with default-information originate may have an undesired effect !...

This post represents the solution and explanation for quiz-17. For some temporary period of time, during network transition, your network consists both on Cisco and Juniper routers for the same role. You will see that they behave differently when it comes to advertising inactive BGP Routes.

This post represents the solution and explanation for quiz-16. Advertising inactive BGP routes can, sometimes, depend on other conditions. This article presents some scenarios with inactive BGP prefixes, suppress-inactive and RIB-NH Matches.

This article discusses the solutions for quiz 15. Yes, I know, I know... it's about RIP ! But you need to be ready for anything when facing the challenges of a CCIE exam. Read along to review some things about auto-summarization (which is "on" by default).

This article is a continuation of previous post about RIP Auto-Summarization and it's impact on discontiguous networks in Cisco networks, but this time from Juniper's perspective. Using the default auto-summary on Cisco devices can lead to routing loops in case of discontiguous networks, as shown in quiz 15.

Your network is up and running without any complaints for few months. All good, until one single link creates problems in the entire network, although it was supposed to be redundant. What's wrong ?

This post represents the solution and explanation for quiz-10. It describes the functionality of the Down Bit in preventing routing loops in your network.

This post represents the solution and explanation for quiz-5.
It explains one of the Loop Prevention mechanisms in OSPF by using the P-bit in the LSA.

This post represents the solution and explanation for quiz-2.
It shows one of the common problems, solutions and recommendations when implementing MSTP.

Redistribution between different or same routing protocols can become a nasty thing when there are 2 or more redistribution points.
In this quiz, redistribution is configured between 2 different OSPF processes on 2 routers. Without a proper configuration, this can lead to routing loops. Read the quiz to see the loop in action and try to solve it.