Let’s do something unusual, because how often do you flood your network with dummy prefixes to see the impact on the environment? Stress testing your network can lead to interesting conclusions, but can also blow the network. So today we
Category: Operating system
What to expect in pexpect? – Advanced examples
I remember how frustrated I was at the beginning of my journey with pexpect. I never knew what string to put as an expect argument, and even if I knew, the pexpect wasn’t catching it. Today we will go through
Pagination handling with pexpect
In this article, we will examine the apparently easy task which is a retrieval of the show version command from the Cisco router. What could go wrong there, and how to fix it? Let’s figure it out! Workflow overview Today,
Script runtime optimization with pexpect
Automation itself is a milestone when it comes to efficiency. Tasks can be executed simultaneously on many devices even during nights/holidays. Sometimes, however, it has its limits. As the task execution time grows more and more, it’s a good idea
Flow control with pexpect
Using pexpect is pretty straightforward, but what about the situations, when we don’t know in what state the device, that we’re interacting with is? In such a scenario, we have to implement logic in our script that could handle different
Basic Cisco router automation workflow with pexpect
Network automation can take many forms depending on the technologies and environments. Sometimes though, we have to dive deep into low-level automation, where we can’t use REST API or other more-convenient technologies. In this article, we will take a brief
TCN impact on the MST topology
Topology changes in a spanning-tree domain are inevitable. But what actually happens, and what impact does it have on the environment? We will find it out in this article! Topology We will examine today’s scenarios on the 3-tier topology. We’ve
PVST and MST (in)compatibility
Spanning-tree protocol configurations can cause headaches among network engineers. Especially if we have mixed topology, with more than one STP implementation. In this article, we will look closer at the interoperability between the Cisco PVST and MST. Based on two
How to add and configure Nokia VSR VM in the GNS3
GNS3 is a powerful tool to simulate computer networks. Many images are ready to use right after the basic setup. However, sometimes we have to put in some more work to make everything work as expected. In this article, we
OSPF with BFD case study
While administrating the network, it’s important to think about high availability. If one network element goes down, the network can still operate properly after it’s converged. But how about the convergence time? It differs from one protocol to another, and