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
IPv6 tunneling over IPv4 GRE
As network engineers, sometimes we have to deal with unusual problems. One of them is when we have two isolated IPv6 network parts, but we want them to be able to communicate with each other. In this article, we’re gonna
Layer 3 MTU case study
In the previous article, I’ve touched the layer 2 MTU topic. This time, we will see how’s the behaviour of layer 3 MTU in 3 different scenarios. Packet structure First of all, before we touch on some case scenarios, let’s
Layer 2 MTU case study
The MTU topic seems to be confusing, especially among young network engineers. I’ve decided to into two parts. This article is focused on the layer 2 MTU aspect exclusively. I’ve prepared 3 case scenarios to present how’s switch behaves with
Basic layer 2 operations on Nokia SR-Linux
In this article, we will dive into a brand-new Nokia network operating system – SR-Linux, which is available on a Nokia 7220 series. We will focus mainly on the basic L2 operations on this platform. Topology The topology for this
Cisco Meraki REST API calls using SDK
In the previous article about Cisco Meraki, I’ve shown you a way to interact with REST API by using the requests library. This article is focused on a Meraki SDK, which provides an easier way to interact with Meraki. Tools
MST interoperability between Nokia 7750 and Cisco IOS
In this article, I want to briefly touch on the Multiple Spanning Tree protocol configuration on Nokia 7750 and its compatibility with Cisco equipment. The spanning-tree configuration on SR-OS varies by type. The MST is slightly different because it uses
Cisco DNA REST API calls using SDK
There are various methods of interacting with the Cisco DNA Center. In the previous articles, I’ve shown you how to execute REST API calls by using Postman software and Python’s requests library. This time, I’ll use an SDK dedicated for
Cisco DNA REST API calls with Python’s requests library
In this article, I’ve shown you how to execute simple REST API calls to the Cisco DNA Center using Postman. Today, we will switch to Python to build a couple of useful scripts. Tools To run REST API calls we