HP UX SNAplus2 Figure 1-11Definitions Needed for Direct Links Using a Virtual Node

SNA Terms and Concepts

Basic APPN Concepts

Figure 1-11 Definitions Needed for Direct Links Using a Virtual Node

To support direct links between any two end nodes in the APPN network, a total of ten link definitions is required. (Each end node needs two link definitions: one to a network node server and one to the virtual node.)

Compared to the direct connectivity requirements for an APPN network that does not use a connection network (see Figure 1-10),you can have a much smaller number of link definitions (10 instead of 30 in this example). In a larger network, the difference in definition requirements becomes even more substantial.

A session between LUs on two nodes in the connection network is established as follows:

1.Each end node first establishes CP-CP sessions with its network node server. (If two end nodes have different network node servers, those network nodes must have a link that supports CP-CP sessions.)

2.End nodes also report their VRN links and local address information to the network node server. The local address information can be a service access point (SAP) address and a medium access control (MAC) address.

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