Avaya Configuring APPN Services Bedienungsanleitung PDF herunterladen (Seite 38)

Configuring APPN Services

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Directory Services

Directory services (DS) manages the directory database and locates network

resources throughout an APPN network. To locate network resources, directory

services at each node collects resource information and maintains the information

in a local directory database. Through a CP-CP session between an APPN

network node and an adjacent APPN end node, the APPN network node registers

(by end node request) the APPN end node’s resources in its local directory

database.

An APPN network node maintains database entries for

• Local resources (LUs and the CP)

• End node resources within the APPN network node’s domain

• End node or network node resources outside the APPN network node’s

domain (called cross-domain resources)

An APPN end node or low-entry networking node maintains database entries for

• Local resources

• Local resources on adjacent nodes that have peer-to-peer communication

sessions (without the presence of an APPN network node or control point, in

the case of a peer-to-peer end node and low-entry networking node)

Topology and Routing Services

Topology and routing services (TRS) resides in every APPN network node and, in

lesser form, in every APPN end node and low-entry networking node. In APPN

network nodes, TRS collects and exchanges information on other network nodes,

and the links between them. For LU-LU sessions, TRS provides the best route

between any two LUs. In APPN end nodes and low-entry networking nodes, TRS

collects information on links and adjacent nodes.

In APPN network nodes, TRS creates and maintains the class-of-service (COS)

database and a copy of the network topology database. The network topology

database contains information on APPN network node connections to other

network nodes and connection networks. (A connection network is a method of

defining an APPN node attachment to a shared-access transport facility, reducing

intermediate node routing and definition requirements.)

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Avaya Configuring APPN Services Bedienungsanleitung Seite 38