Posts in Category: Data Center

[Cheat Sheet] ACI – L3out

This week I detail the L3out object of ACI, allowing routed connectivity to external networks. In this document, I describe the objects and their relationships, present the most common designs, gateway redundancy and there is also a step by step configuration guide. The file is available here: ACI 04 - L3out. PS: The other files of this series can be found here: ACI 01 - The Basics. ACI 02 - Fabric Access Policies ACI 03 - The Tenants Read more [...]

[Cheat Sheet] ACI – The Tenants

The third part of these Cheat Sheets series continues to develop the different objects of the Cisco ACI Fabric. After reviewing the Fabric tab last week which can be seen as the "underlay", now it's time to take a look at the Tenant tab, the "overlay" where the EPGs are located. The "Tenant" tab of the APIC is as confusing as the Fabric tab, there is a multitude of objects to take care of, from the Application profile to the EPG and from the VRF to the Subnets, this cheat sheet will help you to Read more [...]

[Cheat Sheet] ACI – Fabric Access Policies

The second part of these Cheat Sheets series develops the relationship between the Access Policies and the EPGs of ACI.

The first look at this "Fabric" tab of the APIC can be confusing and it's normal, there is a multitude of objects to take care of, from the VLAN Pool to the Leaf interface profile, this cheat sheet will help you to better understand the big picture.

I included a step by step to help you configure your first access port and vPC.

The file is available here: ACI 02 - Fabric Access Read more [...]

[Cheat Sheet] ACI – The basics

It's been a while since I blogged!

These days I would like to share more regarding the technologies I'm working on, and ACI is one of those, so here is the first of a series of Cheat Sheets, starting with the basics.

The file can be downloaded directly here.

Let me know if it's useful for you, and which part of ACI would be interesting to develop here. Read more [...]

Routage asymétrique, flooding unicast et troubleshooting

On parle de routage asymétrique lorsqu'un paquet emprunte un chemin différent selon le sens du trafic. En d'autres termes, lorsqu'un paquet emprunte un chemin dans le sens Aller, et un autre chemin dans le sens du retour. Lorsque tout fonctionne correctement, vous pouvez ne pas vous rendre compte que du routage asymétrique est en cours sur votre réseau, mais c'est lorsque vous ajoutez du NAT ou des Firewalls à l'architecture que tout se complique, car ils commencent à dropper les flux. Je vais Read more [...]