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  • TCN impact on the MST topology

  • PVST and MST (in)compatibility

  • Universal Network Backup Tool v 2.0 released

  • How to add and configure Nokia VSR VM in the GNS3

  • OSPF with BFD case study

  • IPv6 tunneling over IPv4 GRE

  • Layer 3 MTU case study

Cisco, GNS3, iOS, NetStudy

TCN impact on the MST topology

28/04/202228/04/2022 Radosław Kochman

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

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Cisco, GNS3, iOS, NetStudy

PVST and MST (in)compatibility

27/04/202227/04/2022 Radosław Kochman

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

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Netmiko, News

Universal Network Backup Tool v 2.0 released

07/02/2022 Radosław Kochman

It’s been a while since the Universal Network Backup Tool was developed. This weekend a new version was released. There is one major bug fix and some enhancements. Changelog: Fixed bug crashing script because of ‘%’ present in the username/password

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GNS3, Nokia/Alcatel, TiMOS/SR-OS

How to add and configure Nokia VSR VM in the GNS3

13/11/202113/11/2021 Radosław Kochman

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

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Cisco, GNS3, iOS, NetStudy

OSPF with BFD case study

18/10/202118/10/2021 Radosław Kochman

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

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Cisco, GNS3, iOS, NetStudy

IPv6 tunneling over IPv4 GRE

17/07/202116/07/2021 Radosław Kochman

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

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Cisco, GNS3, iOS, NetStudy

Layer 3 MTU case study

07/06/202103/06/2021 Radosław Kochman

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

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Cisco, GNS3, iOS, NetStudy

Layer 2 MTU case study

03/05/202103/05/2021 Radosław Kochman

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

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NetStudy, Nokia/Alcatel, SR-Linux

Basic layer 2 operations on Nokia SR-Linux

19/04/202103/05/2021 Radosław Kochman

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

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Cisco, Cisco Meraki, DEVASC 200-901, Python, REST API

Cisco Meraki REST API calls using SDK

05/04/202105/04/2021 Radosław Kochman

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

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  • TCN impact on the MST topology
  • PVST and MST (in)compatibility
  • Universal Network Backup Tool v 2.0 released
  • How to add and configure Nokia VSR VM in the GNS3
  • OSPF with BFD case study

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