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Home > Cloud & Networking > Networking > Cisco ACI Cookbook
Cisco ACI Cookbook
Cisco ACI Cookbook

Cisco ACI Cookbook: A Practical Guide to Maximize Automated Solutions and Policy-Drive Application Profiles

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Cisco ACI Cookbook

Configuring Policies and Tenants

In this chapter, we will cover the following recipes:

  • Creating fabric policies
  • Creating access policies
  • Creating tenants
  • Configuring bridge domains
  • Configuring contexts
  • Creating application network profiles
  • Creating endpoint groups
  • Using contracts between tenants
  • Creating filters
  • Creating contracts within tenants
  • Creating management contracts

Introduction

We will start configuring the ACI fabric by creating some policies and a couple of tenants.

The ACI policy model is all about mapping application requirements to policies. We need tenant A to talk to an SQL server; we create a policy for that. We also need tenant A to talk the storage system, so we create a policy for that.

The APIC looks after the policies. When we make a change to an object within the fabric, it is the job of the APIC to apply this change to the policy model, which then makes the change to the affected endpoint. Such an example would be adding a new device to the fabric. Communication with the new device is prohibited until the policy model is updated to include the new device.

There are different policies, but they can be split into fairly distinct groups: those that govern the ACI fabric as a whole and those that are concerned with tenants.

All the policies are recorded...

Creating fabric policies

In this recipe, we will create an NTP policy and assign it to our pod. NTP is a good place to start, as having a common and synced time source is critical for third-party authentication, such as LDAP and logging.

In this recipe, we will use the Quick Start menu to create an NTP policy, in which we will define our NTP servers. We will then create a POD policy and attach our NTP policy to it. Lastly, we'll create a POD profile, which calls the policy and applies it to our pod (our fabric).

We can assign pods to different profiles, and we can share policies between policy groups. So we may have one NTP policy but different SNMP policies for different pods:

The ACI fabric is very flexible in this respect.

How to do it...

  1. From the Fabric...

Creating access policies

Access policies control the operation of switch ports, allowing connectivity to resources such as storage and compute, hypervisors, and layer 4 to layer 7 devices and protocols such as CDP, LLDP, and STP.

In this recipe, we are going to look at access policies and enable a preconfigured policy. We will then look at how to override this policy on a per-port basis, and also to override blocks of ports on a leaf.

How to do it...

  1. From the Fabric menu, select Access Policies. Go to Interface Policies | Policies | CDP Interface. We can see that there is already a default policy:
  1. The default is for CDP to be disabled. So switch the Admin State to Enabled, and click on SUBMIT in the bottom corner of the window:
  1. This...

Creating tenants

Tenants can be anything we want them to be (within reason): they can be a customer, a business unit within an enterprise, or a grouping of policies. The term 'tenant' is flexible, but each tenant is (by default) an isolated unit within the fabric. It is a logical container, one that can remain self-contained or, through contracts, share resources with other tenants.

The MIT for the tenant is as follows:

Tenant MIT

As you can see from the diagram, tenants contain some different components, including application profiles, bridge domains, VRFs (also referred to as contexts), and contracts. Some of these components, such as bridge domains, have their own components, such as subnets.

We have a couple of tenants preconfigured. These are the “common” tenant (common), which holds policies for shared services, such as firewalls and DNS settings; the “infrastructure”...

Configuring bridge domains

Bridge domains (BDs) provide layer 2 forwarding within the fabric as well as a layer 2 boundary. A BD must be linked to VRF and must have at least one subnet associated with it. BDs define the unique layer 2 MAC address space and also the flood domain (if flooding is enabled). 

Bridge domains can be public, private, or shared. Public bridge domains are where the subnet can be exported to a routed connection, whereas private ones apply only within the tenancy. Shared bridge domains can be exported to multiple VRFs within the same tenant, or across tenants when part of a shared service.

In this recipe, we will create a bridge domain and, along with it, define a VRF and a subnet for communication within the tenancy. 

How to do it...

...

Introduction

We will start configuring the ACI fabric by creating some policies and a couple of tenants.

The ACI policy model is all about mapping application requirements to policies. We need tenant A to talk to an SQL server; we create a policy for that. We also need tenant A to talk the storage system, so we create a policy for that.

The APIC looks after the policies. When we make a change to an object within the fabric, it is the job of the APIC to apply this change to the policy model, which then makes the change to the affected endpoint. Such an example would be adding a new device to the fabric. Communication with the new device is prohibited until the policy model is updated to include the new device.

There are different policies, but they can be split into fairly distinct groups: those that govern the ACI fabric as a whole and those that are concerned with tenants.

All the policies are recorded in the MIT, or management information tree.

The MIT

In this chapter, we will start by creating...

Creating fabric policies

In this recipe, we will create an NTP policy and assign it to our pod. NTP is a good place to start, as having a common and synced time source is critical for third-party authentication, such as LDAP and logging.

In this recipe, we will use the Quick Start menu to create an NTP policy, in which we will define our NTP servers. We will then create a POD policy and attach our NTP policy to it. Lastly, we'll create a POD profile, which calls the policy and applies it to our pod (our fabric).

We can assign pods to different profiles, and we can share policies between policy groups. So we may have one NTP policy but different SNMP policies for different pods:

The ACI fabric is very flexible in this respect.

How to do it...

  1. From the Fabric menu, select Fabric Policies. From the Quick Start menu, select Create an NTP Policy:

 

  1. A new window will pop up, and here we'll give our new policy a name and (optional) description and enable it. We can also define any authentication keys...

Creating access policies

Access policies control the operation of switch ports, allowing connectivity to resources such as storage and compute, hypervisors, and layer 4 to layer 7 devices and protocols such as CDP, LLDP, and STP.

In this recipe, we are going to look at access policies and enable a preconfigured policy. We will then look at how to override this policy on a per-port basis, and also to override blocks of ports on a leaf.

How to do it...

  1. From the Fabric menu, select Access Policies. Go to Interface Policies | Policies | CDP Interface. We can see that there is already a default policy:
  1. The default is for CDP to be disabled. So switch the Admin State to Enabled, and click on SUBMIT in the bottom corner of the window:
  1. This has enabled CDP globally, but what if we need to be a little more selective and disable on a single port?

 

  1. Right-click on CDP Interface and select Create CDP Interface Policy.

 

  1. Name the new policy CDP-OFF and set the state to Disabled.
  1. Click on SUBMIT.
  2. We now have two...

Creating tenants

Tenants can be anything we want them to be (within reason): they can be a customer, a business unit within an enterprise, or a grouping of policies. The term 'tenant' is flexible, but each tenant is (by default) an isolated unit within the fabric. It is a logical container, one that can remain self-contained or, through contracts, share resources with other tenants.

The MIT for the tenant is as follows:

Tenant MIT

As you can see from the diagram, tenants contain some different components, including application profiles, bridge domains, VRFs (also referred to as contexts), and contracts. Some of these components, such as bridge domains, have their own components, such as subnets.

We have a couple of tenants preconfigured. These are the “common” tenant (common), which holds policies for shared services, such as firewalls and DNS settings; the “infrastructure” tenant (infra), which holds policies and VXLAN pools; and the “management” tenant (mgmt), which is used for out-of-band...

Configuring bridge domains

Bridge domains (BDs) provide layer 2 forwarding within the fabric as well as a layer 2 boundary. A BD must be linked to VRF and must have at least one subnet associated with it. BDs define the unique layer 2 MAC address space and also the flood domain (if flooding is enabled). 

Bridge domains can be public, private, or shared. Public bridge domains are where the subnet can be exported to a routed connection, whereas private ones apply only within the tenancy. Shared bridge domains can be exported to multiple VRFs within the same tenant, or across tenants when part of a shared service.

In this recipe, we will create a bridge domain and, along with it, define a VRF and a subnet for communication within the tenancy. 

How to do it...

  1. We start by going into the tenant we created in the previous recipe and going to Networking | Bridge Domains.
  1. Click on Actions, and then on Create Bridge Domain.

 

 

  1. This launches a new window. Here, we name our bridge domain and assign a VRF...

Configuring contexts

So far, we have configured a tenant and created a bridge domain and context for it. A context, also known as a VRF (Virtual Routing and Forwarding) is a unique layer 3 forwarding domain. We can have multiple VRFs within a tenant, and VRFs can be associated with more than one bridge domain (but we cannot associate a bridge domain with more than one VRF).

In this recipe, we will create a second VRF under TenantA and a new bridge domain.

How to do it...

  1. From the Networking menu under the tenant, select VRFs.
  1. From the Actions menu, select Create VRF.

 

 

  1. Give the VRF a name, and select any applicable options. Here, I have chosen to add a DNS label of VRF2. We can create a new bridge domain (this is the default option) at this stage as well.

 

 

  1. Click on NEXT, select the Forwarding setting (such as Optimize), and change any defaults (which I have not changed here).
  1. When you have done this, click on FINISH. The new VRF will be shown underneath the first VRF we created.

How it works....

Creating application network profiles

Application profiles (APs) are containers for the grouping of endpoint groups (EPGs). We can have more than one EPG with an AP. For example, an AP could group a web server with the backend database, with storage, and so on. EPGs are assigned to different bridge domains.

Application profiles define different aspects to the tenancy, governing security, quality of service (QoS), service-level agreements (SLAs), and layer 4 to layer 7 services.

APs are so intrinsically linked to EPGs (and contracts to a lesser extent) that it is harder to create these as separate tasks. For this reason, we will create them in one recipe. As you can see from the following screenshot, we are even guided in the Quick Start menu to create the EPGs and contacts when we create the application profile.

If we click on the grid-style icon next to the play button, the help window for the task will pop up.

How to do it...

  1. We can create an AP from the Quick Start menu by clicking on the...
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Page 1 of 13

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Key benefits

  • • Confidently provision your virtual and physical infrastructure for application deployment
  • • Integrate Cisco ACI with hypervisors and other third party devices
  • • Packed with powerful recipes to automate your IT operations

Description

Cisco Application Centric Infrastructure (ACI) is a tough architecture that automates IT tasks and accelerates data-center application deployments. This book focuses on practical recipes to help you quickly build, manage, and customize hybrid environment for your organization using Cisco ACI. You will begin by understanding the Cisco ACI architecture and its major components. You will then configure Cisco ACI policies and tenants. Next you will connect to hypervisors and other third-party devices. Moving on, you will configure routing to external networks and within ACI tenants and also learn to secure ACI through RBAC. Furthermore, you will understand how to set up quality of service and network programming with REST, XML, Python and so on. Finally you will learn to monitor and troubleshoot ACI in the event of any issues that arise. By the end of the book, you will gain have mastered automating your IT tasks and accelerating the deployment of your applications.

Who is this book for?

If you are a network administrator, system administrator, or engineer and are aware of the basics of Cisco ACI but want to start using it to automate your tasks, then this book is for you

What you will learn

  • • Master the Cisco ACI architecture
  • • Discover the ACI fabric with easy-to-follow steps
  • • Set up quality of service within ACI
  • • Configure external networks with Cisco ACI
  • • Integrate with VMware and track VMware virtual machines
  • • Configure apply and verify access policies
  • • Extend or migrate a VMware virtual-machine LAN inside the ACI fabric
  • • Monitor ACI with third party tools and troubleshoot issues
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Publication date : May 25, 2017
Length: 424 pages
Edition : 1st
Language : English
ISBN-13 : 9781787129214
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Category :
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Publication date : May 25, 2017
Length: 424 pages
Edition : 1st
Language : English
ISBN-13 : 9781787129214
Vendor :
Cisco
Category :
Cloud & Networking
Concepts :
Networking
Tools :
Cisco

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Table of Contents

10 Chapters
Understanding Components and the ACI Fabric Chevron down icon Chevron up icon
Understanding Components and the ACI Fabric
Introduction
Understanding ACI and the APIC
An overview of the ACI fabric
Converting Cisco from Nexus NX-OS mode to ACI mode
ACI fabric overlay
An introduction to the GUI
Configuring Policies and Tenants Chevron down icon Chevron up icon
Configuring Policies and Tenants
Introduction
Creating fabric policies
Creating access policies
Creating tenants
Configuring bridge domains
Configuring contexts
Creating application network profiles
Creating endpoint groups
Using contracts between tenants
Creating filters
Creating contracts within tenants
Creating management contracts
Hypervisor Integration (and Other Third Parties) Chevron down icon Chevron up icon
Hypervisor Integration (and Other Third Parties)
Introduction
Installing device packages
Creating VMM domains and integrating VMWare
Associating vCenter domains with a tenant
Deploying the AVS
Discovering VMWare endpoints
Adding virtual machines to a tenant
Tracking ACI endpoints
Integrating with A10
Deploying the ASAv
Integrating with OpenStack
Integrating with F5
Integrating with Citrix NetScaler
Routing in ACI Chevron down icon Chevron up icon
Routing in ACI
Introduction
Creating a DHCP relay
Utilizing DNS
Routing with BGP
Configuring a layer-3 outside interface for tenant networks
Associating a bridge domain with an external network
Using route reflectors
Routing with OSPF
Routing with EIGRP
Using IPv6 within ACI
Setting up multicast for ACI tenants
Configuring multicast on the bridge domain and interfaces
ACI transit routing and route peering
ACI Security Chevron down icon Chevron up icon
ACI Security
Introduction
Creating local users
Creating security domains
Limiting users to tenants
Connecting to a RADIUS server
Connecting to an LDAP server
Connecting to a TACACS+ server
Implementing Quality of Service in ACI Chevron down icon Chevron up icon
Implementing Quality of Service in ACI
Introduction
Preserving existing CoS settings
Configuring user-defined classes
Creating a basic QoS configuration
Verifying QoS
Network Programmability with ACI Chevron down icon Chevron up icon
Network Programmability with ACI
Introduction
Browsing the object store using the Object Store Browser
Programming the ACI through REST
Authenticating through REST and XML
Creating a tenant using REST and XML
Deleting a tenant using REST and XML
Creating an APN and an EPG using REST and XML
Creating an application profile and EPG using REST
Authenticating through REST and JSON
Creating a tenant using REST and JSON
Using the Python SDK
Logging into the APIC using Cobra
Creating a tenant using the SDK
Monitoring ACI Chevron down icon Chevron up icon
Monitoring ACI
Introduction
Finding faults
Viewing events
Navigating the audit logs
Setting up Call Home
Configuring SNMP
Configuring Syslog
Configuring NetFlow
Troubleshooting ACI Chevron down icon Chevron up icon
Troubleshooting ACI
Introduction
Layer 2 troubleshooting
FEX troubleshooting
SSL troubleshooting
Switch diagnostics
APIC troubleshooting
Upgrading the ACI software
VMM troubleshooting
Routing verifications
Troubleshooting external connectivity
Multicast troubleshooting
QoS troubleshooting
An End-to-End Example Using the NX-OS CLI Chevron down icon Chevron up icon
An End-to-End Example Using the NX-OS CLI
Introduction
Setting up in-band and out-of-band access to the nodes
Creating the security domain
Creating the VLAN domain
Creating the VMWare domain
Creating the tenant
Creating the VRF
Creating the bridge domains
Creating the applications and EPGs
Creating the contract
Creating an L4-L7 device
Creating service templates
Setting up the client VMs

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Rating distribution
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Ahmad Maher Che Mohd Adib Jul 25, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Love it!
Amazon Verified review Amazon
Smith J. Mar 22, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This is one of the best Cisco ACI fundamentals book out there. Those who want to have a very very basic understanding of what Cisco ACI is and what id does - this book is the best. The way the author describes about each components of Cisco ACI, what it is and how to do it - is just amazing. He takes us to the Cisco ACI world in simple words and in a understandable manner. Anyone who is interested to know the fundamentals of Cisco ACI, they will love this book. I would like to say thanks for the author for this book and also to encourage the author to write more books like this. Thank you.
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vinayak Oct 30, 2017
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Good one
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Cliente Amazon Mar 19, 2019
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Es bueno, me ha dado una visión bastante cercana aunque lo recomiendo para profesionales interesados en deployment, nivel medio. Está muy bien presentado, ordenado y explicado. Falta algo más de teoría y diagramas de ejemplo, de soluciones posibles con Cisco ACI + tecnologías y entornos: IBM vmware citrix asa rest json ...
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amitava ghorui May 15, 2019
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I don't want to by this book but it is showing in my order list as purchased.I have not make any payment for this product also not getting any options to cancel this order. Pls help me to cancel this order.
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Jun 2023 746 pages
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Ansible for Real-Life Automation
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AWS for Solutions Architects
AWS for Solutions Architects
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About the author

Profile icon 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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Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela