
Advanced Peer-to-Peer Networking Overview
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In APPN end nodes, TRS creates and maintains the COS database, and maintains
the local topology database (also maintained by TRS at the network node). The
local topology database contains information on connections involving the local
end nodes: end node-to-end node, end node-to-network node, and end
node-to-virtual routing node.
For LU-LU sessions, TRS computes the optimal route through an APPN network
between the two nodes on which the LUs reside. A route in an APPN network is
an ordered sequence of nodes and transmission groups (TGs) that represents a
path from an origin to a destination, called a Route Selection Control Vector
(RSCV). In APPN end nodes, TRS uses the local database to select possible
transmission groups from the end node to an adjacent node. In APPN network
nodes, TRS uses the information provided by the two end nodes, together with the
information in the network node’s COS and topology database, to select a route.
Configuration Services
Configuration services (CS) manages links to adjacent APPN nodes. The APPN
node operator facility (NOF) initializes configuration services through Site
Manager.
The basic configuration functions are
• Node definition
• Interfaces
• Ports
• Adjacent link stations
• Connection networks
• Directory services
Refer to Chapter 3, “Editing APPN Parameters,” for detailed information on
configuring APPN nodes.
Management Services
Management services (MS) controls and monitors the node’s resources. If an error
condition occurs, APPN receives or generates event messages about resources and
conditions. For information on the APPN event messages, refer to Event Messages
for Routers and BNX Platforms.
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