This layer comprises of the components residing in the interface from which the user will access the application. In this layer, indicate if there is a client and/or an externally hosted application / web services.

Web Server Layer

In this layer, include the BIG IP Global Traffic Manager (GTM) that routes requests to the two Local Traffic Managers (LTMs).

1. GTM must even if the application is not load-balanced.
2. If the application is load-balanced across facilities, include both the LTM and associated boxes.
3. If the application is load-balanced within a facility, remove the LTMs and associated boxes that apply to the other facility.
4. Under each LTM,

• Indicate if that facility resources are used in an ACTIVE configuration or a PASSIVE configuration
• Indicate the number of Web Server instances associated with the application. The minimum number is 1.

DMZ – Application Server Layer

In this layer, indicate the number of JVMs or the number of cluster nodes applicable for the application.

1. If all your JVMs or cluster nodes are in one facility only, remove the boxes that refer to the other facility.
2. If the application is a standalone JVM, indicate the number of JVMs at each facility. The minimum number is 1. In this case remove the box that represents cluster.
3. If the application is part of a cluster, indicate the number of cluster nodes at each facility. The minimum number is 1. In this case, remove the box that represents JVMs.

Data Layer

1. If the application uses data replication across facilities, include the appropriate box in the diagram, depending on the database that is replicated (Oracle, DB2, SQL Server, File).
2. If the application uses file replication across facilities, include that box in the diagram.

Application Dependency Diagram

In this diagram, the various application dependencies should be depicted. Also, for each dependency, indicate the connection type as follows:

1. SD – Synchronous – fully down, if link is broken
2. SP – Synchronous – partially down, if link is broken
3. AD – Asynchronous – fully down, if link is broken
4. AP – Asynchronous – partially down, if link is broken

When you start listing the items, they may exceed the box size – increase the box size so that items show up within the box.

In this diagram, it should be required to list all the entities that the application is dependent upon. From a completeness perspective, you may want to list the other entities that are dependent on this application (however, this depiction is optional).

Data Sources

In this box, you should list the database name, DB2 sub-system name, application system names, etc., as appropriate, on which the application is dependent upon for data.

Middleware Components

In this box, you should list the middleware components (SAP CRM, ERP, etc.) on which the application is dependent upon for interactions with other systems.

External Systems

In this box, you should list the external systems on which the application is dependent upon. For each dependency, list the vendor name and the application / web service name.

Components

In this box, you should list the Enterprise components on which the application is dependent upon for information.

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