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Reference Architecture | Dynamic L4-L7 Service Insertion with Cisco ACI and A10 Thunder ADC

ACI Design with A10 Thunder ADC

The Cisco ACI fabric consists of L2 and L3 infrastructure built using Nexus 9000 switches in a leaf and spine

architecture. The L4-L7 appliances such as load balancers and ﬁrewalls can be attached to any ports on the leaf

switches. The entire ACI fabric acts like a uniﬁed big switch that can be conﬁgured and managed through a

centralized policy controller (aka APIC). Endpoints, which can be attached to the leaf switches, include virtualized

and bare-metal servers, storage devices, other switches and routers. The application services can be hosted on

either physical bare-metal servers or virtualized servers that are connected to the leaf switches. Figure 8 shows the

ACI powered data center with A10 devices and compute, storage and other infrastructure components.

Cisco ACI with A10 Thunder ADC

ACI Fabric

L4 – L7 (Physical)

Appliances

L4 – L7 (Hybrid)

Appliances

L4 – L7 (Virtual)

Appliances

Bare-Metal

Servers

Virtualized

Servers

Cisco APIC

ACI

ACI ACI

APIC

VM VM

VMware ESXi

Figure 8: ACI design with A10 Thunder ADC

In the Cisco ACI model, applications are deﬁned logically using constructs that are application centric, rather

than network centric. The grouping of resources or entities is done based on logical segmentation; it is no

longer based on physical or virtual resources. For example, a group of physical and virtual servers could

be grouped together if they are essentially providing the same type of application services. The ACI model

supports multi-tenancy where the logical entity supports grouping of applications, network connectivity

and security policy enforcement in a contained logical entity. Figure 9 shows a simple example of a two-tier

application network that can be hosted on the Cisco ACI fabric in an automated and programmable manner.

This example can be extended to a three-tier application as shown in Figure 3 or any multi-tier application

hosted on the ACI fabric.

Application Network Proﬁle

PolicyWeb Application

Figure 9: Two-tier application network prole

The web tier consists of a front end tier that serves the web consumers or users. The application tier hosts the

servers that provide the content to the web users. The web and application tiers here represent two Endpoint

Groups (EPGs). Now we will discuss some of the core concepts of ACI. An understanding of these concepts is

essential in the subsequent sections that discuss application proﬁle conﬁguration and the L4-L7 service graph

used to provision and deploy applications on top of an ACI fabric.

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