Posts

A short post about how I do SSH session management for network devices in Linux

CONTINUE READING

In this post I will show how to use IETF, OpenConfig and vendor-specific YANG models in Ansible to configure BGP peering and verify state of physical interfaces between IOS-XE and JUNOS devices.

CONTINUE READING

One thing that puts a lot of network engineers off NETCONF and YANG is the complexity of the device configuration process. Even the simplest change involves multiple tools and requires some knowledge of XML. In this post I will show how to use simple, human-readable YAML configuration files to instantiate YANG models and push them down to network devices using a single command

CONTINUE READING

Now it’s time to turn our gaze to the godfather of YANG models and one of the most famous open-source SDN controllers, OpenDaylight. In this post I’ll show how to connect Cisco IOS XE device to ODL and use Yang Development Kit to push a simple BGP configuration through ODL’s RESTCONF interface

CONTINUE READING

The sheer size of some of the YANG models can scare away even the bravest of network engineers. However, as it is with any programming language, the complexity is built out of a finite set of simple concepts. In this post we’ll learn some of these concepts by building our own YANG model to program static IP routes on Cisco IOS XE

CONTINUE READING

Everyone who has any interest in network automation inevitably comes across NETCONF and YANG. These technologies have mostly been implemented for and adopted by big telcos and service providers, while support in the enterprise/DC gear has been virtually non-existent. Things are starting to change now as NETCONF/YANG support has been introduced in the latest IOS XE software train. That’s why I think it’s high time I started another series of posts dedicated to YANG, NETCONF, RESTCONF and various open-source tools to interact with those interfaces

CONTINUE READING

In this post we will see how OVN implements virtual networks for OpenStack. The structure of this post is such that starting from the highest level of networking abstraction we will delve deeper into implementation details with each subsequent section. The biggest emphasis will be on how networking data model gets transformed into a set of logical flows, which eventually become OpenFlow flows. The final section will introduce a new overlay protocol GENEVE and explain why VXLAN no longer satisfies the needs of an overlay protocol.

CONTINUE READING

This is a first of a two-post series dedicated to project OVN. In this post I’ll show how to build, install and configure OVN to work with a 3-node RDO OpenStack lab

CONTINUE READING

I was fortunate enough to be given a chance to test the new virtual QFX 10k image from Juniper. In this post I will show how to import this image into UnetLab and demonstrate the basic L2 and L3 EVPN services

CONTINUE READING

In this post we’ll explore how DVR is implemented in OpenStack Neutron and what are some of its benefits and shortcomings

CONTINUE READING