Network Architecture

Automating Cumulus With Ansible and ZTP

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Introduction In the last few of my blog entries, I discussed setting up a virtual lab using Cumulus’ VX image for VirtualBox.  I then went through and got EVPN working, and finally showed how using VXLAN, we can consider dumping MPLS for L2VPNs.  This entry will focus on automating the bring-up of a new switch running Cumulus, and it’ll…

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Network Architecture

VXLAN Instead of MPLS – Part 2

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Introduction In a previous entry, I described my thoughts on using VXLAN to replace MPLS for L2VPNs across a network.  After reading through it, I decided to go back and re-do the configuration examples a bit, to make things a bit more like a backbone with several hops between the customer routers.  This entry will outline those changes and…

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Network Architecture

VXLAN Instead of MPLS

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Introduction In a previous entry, I chronicled my self-education regarding Cumulus’ OS and how to do EVPN VXLAN with it.  Throughout this entry, I’ll be referring back to that document, including some of the diagrams, configurations, etc.  This entry will explain another use for VXLAN, and that’s running it instead of MPLS to handle L2VPNs across a network.  That…

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Network Architecture

Deploying Firewalls With Routing

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Introduction State-tracking firewall devices are commonly deployed at the border of data centers, office networks, and other corporate environments where precious IP needs to be kept out of the hands of others.  My opinion of these firewall devices is that they should be avoided at all costs, and I’ll get into that later.  Sometimes we’re forced to deploy things…

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Network Architecture

EVPN and VXLAN on Cumulus

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Introduction and Purpose Introduction Almost three years ago, I wrote this long and detailed post about building a VXLAN-enabled virtual lab on a KVM hypervisor, using Arista’s vEOS image.  Prior to that, I also wrote up this post regarding the ideas around using VXLAN for spanning L2 across an L3 infrastructure.  In the second post, I wrote about the…

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Network Architecture

VXLAN Configuration and Deployment

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In my VXLAN: Providing Ponies for Bad System Designers entry, I discussed using an L2 overlay technology such as VXLAN to provide virtually spanned L2 VLANs over an L3 infrastructure.  In this document, I’ll show via diagrams and config snippets how to build a poorly-designed network and why it’s a problem.  Then I’ll use VXLAN to build a similar…

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