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Category: Cisco

Cisco, iOS, Pexpect, Python

Flow control with pexpect

13/03/2023 Radosław Kochman

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

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Cisco, iOS, Pexpect, Python

Basic Cisco router automation workflow with pexpect

10/03/202310/03/2023 Radosław Kochman

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

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Cisco, Cisco SD-WAN, DEVASC 200-901, REST API, SDN

Cisco SD-WAN REST API calls with Python’s requests library

12/06/202212/06/2022 Radosław Kochman

In the previous article on Cisco SD-WAN, I’ve shown you how to interact with the vManage using Postman software. Now it’s time to do some coding. We will interact with the SD-WAN using the Python requests library. For this article,

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Cisco, Cisco SD-WAN, DEVASC 200-901, REST API, SDN

Cisco SD-WAN REST API calls with Postman

11/06/202211/06/2022 Radosław Kochman

This article starts a series covering the depths of Cisco SD-WAN. This time, however, we will just scratch the surface with some basic requests. For that, we will use the Postman software and Cisco SD-WAN 20.4 Always On sandbox Authentication

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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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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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Recent Posts

  • Flow control with pexpect
  • Basic Cisco router automation workflow with pexpect
  • Network automation – why does it matter?
  • Cisco SD-WAN REST API calls with Python’s requests library
  • Cisco SD-WAN REST API calls with Postman

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