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

Business Solution

The new data center design has to be business-focused, with emphasis on applications and programmability

to provide agility and simplicity in data center infrastructure. Software Deﬁned Networking (SDN) technologies

look promising as they bring a similar degree of agility to networks that abstraction, virtualization and

orchestration have brought to server infrastructure. Multiple vendors are working on diﬀerent approaches to

oﬀer SDN products and services: While some vendors are creating SDN-enabled switches, routers and network

equipment, others are taking a more holistic software approach that would allow the network to be virtualized

through central controllers.

Figure 1 shows Cisco ACI powered by Cisco Nexus 9000 Series Switches, Cisco APIC and A10 Thunder ADC

appliances. In this design, Cisco APIC acts as the centralized policy controller that manages and controls the

infrastructure. Cisco Nexus 9000 Series Switches provide the L2-L3 fabric for ACI. And A10 Thunder ADC devices

provide L4-L7 services. IT organizations can now leverage this joint solution to transform their data center to an

application-centric model with signiﬁcant increase in provisioning speed, business agility and reduced costs.

A10 Thunder ADC

A10 Thunder Appliances

Physical, Hybrid and Virtual

Cisco Application

Policy Infrastructure

Controller

Cisco Nexus

9000 Series

L2 - L3 Network

Infrastructure

Automation

Management

L4 - L7

Application Services

APIC

ACI

Application-Centric Infrastructure

Figure 1: Cisco ACI and A10 Thunder ADC

The Cisco ACI fabric is designed as an application-centric intelligent network, where the Cisco APIC policy

model is deﬁned from the top down as a policy enforcement engine focused on the application itself and

abstracting the networking functionality underneath. The A10 integration with Cisco ACI ensures that network

segmentation and security policies are enforced consistently whenever a new application is deployed in

the network. IT organizations can leverage the comprehensive joint solution to transform their data center

as applications and services are created with signiﬁcant increase in provisioning speed, business agility and

reduced costs.

Evolving applications require that IT organizations ensure a seamless infrastructure for application deployment

and on-demand consumption. It is critical to build modern data center infrastructures that deliver consistent

application and security services in an elastic and cost-eﬀective environment. The biggest challenge with

current networking technologies is the tight coupling between networking protocols and features, forwarding

and security policy. As a result, any change in network policy is very likely to adversely aﬀect traﬃc forwarding

and disrupt ﬂow.

In the new approach to building data center infrastructures, there is a focus on combining applications,

networking, security and the underlying infrastructure in a common operational model optimized for solving

business problems. Programmability is the glue that is the key to delivering consistent policy enforcement across

all applications, whether they are custom or oﬀ-the-shelf. It is critically important to have seamless integration

of application networking services with other data center infrastructure to deliver dynamic L4-L7 services and

automated policy enforcement for SLAs, as well as security compliance in a shared, multi-tenant environment.

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