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Cisco ACI Cookbook

You're reading from Cisco ACI Cookbook A Practical Guide to Maximize Automated Solutions and Policy-Drive Application Profiles

Product type Paperback

Published in May 2017

Publisher

ISBN-13 9781787129214

Length 424 pages

Edition 1st Edition

Tools

Cisco

Concepts

Networking

Author (1):

Stuart Fordham

View More author details

Table of Contents (11) Chapters

Preface

1. Understanding Components and the ACI Fabric FREE CHAPTER

2. Configuring Policies and Tenants

3. Hypervisor Integration (and Other Third Parties)

4. Routing in ACI

5. ACI Security

6. Implementing Quality of Service in ACI

7. Network Programmability with ACI

8. Monitoring ACI

9. Troubleshooting ACI

10. An End-to-End Example Using the NX-OS CLI

Creating a DHCP relay

By default, ACI-wide flooding is disabled. Because flooding is disabled, connecting to a DHCP server is only possible if it is in the same EPG as the client (as flooding within a bridge domain is enabled).

The options, therefore, are to have one DHCP server per-EPG, which would be wasteful on "compute" resources and on administrative time, or to use a DHCP relay and have one, central, server.

In this recipe, we will be setting up a DHCP relay.

How to do it…

We will be using the Common tenant for this (first), as it is best practice to place resources within this tenant if they are to be shared across multiple tenants. Using the Common tenant is not the only way, though; we can also use the Fabric Access policies to achieve the same goal for the Infrastructure tenant.

Note

Why would you use one tenant over the other?Using the Common tenant means that the DHCP relays can be used by any tenant. If we use the Infrastructure tenant, the DHCP relay policies are selectively exposed...

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Authors (1)

Fordham

Fordham

Stuart Fordham is a networking engineer who focuses on security and DevOps. He is CCIE #49337 (Routing and Switching), along with other qualifications such as CCDP, CEH, RHCSA, and MCSE. He has also been a Cisco Champion for 2017 and has authored a series of networking books. He is the network manager for a leading global Communication-as-a-Service company and has worked for hedge funds, the government, and the National Health Service.

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