HP -UX SNAplus2 Instrukcja Użytkownika Pobierz pdf (Strona 62)

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62 Chapter 1

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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