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

The A10 device package enables Cisco APIC to conﬁgure ADC server load balancing conﬁguration parameters

deﬁned in the service graph conﬁguration. In this example, the service graph allows the user to conﬁgure the

following parameters for A10 Thunder ADC load balancing service:

• Multiple real servers with IP address, port number, etc.

• Service-group to pool multiple real servers into a group

• Virtual server IP (VIP) for application services

• Health monitoring rules to monitor the state of real servers

• Network Address Translation (NAT) pools to perform source and destination address translation

The service graph itself can be conﬁgured either through the APIC GUI or can be conﬁgured through an XML

post to the APIC. The service graph conﬁguration requires some parameters that are marked as mandatory,

for example the virtual server name, IP address and port number. The user can conﬁgure one or more

service graph templates under the tenant; however, the service graph renderings are done only when the

graph is applied to a security contract as shown in Figure 15. When the service graph is rendered, the APIC

communicates with the A10 device using aXAPI commands and conﬁgures interfaces, VLANs and server

load balancing speciﬁc conﬁguration parameters. The A10 device package makes the distinction between a

physical A10 device and virtual A10 device so that the Ethernet interface on the A10 device can be conﬁgured

as a tagged or untagged port. Figure 14 shows the ADC conﬁguration in the APIC once the graph has been

associated with a contract.

Figure 14: Service graph showing L4-L7 function node conguration

Figure 15 shows how the graph is associated with a contract. EPGs can only communicate with other EPGs

as per the contract rules, and inter-EPG communication is disabled by default in ACI. The function node gets

inserted in inter-EPG communication through the service graph.

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ADC SG-1 Bedienungsanleitung Seite 14