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v A control point (CP), which manages the node’s resources
v Resources owned by APPN end nodes and LEN end nodes that use the services
of the network node
APPN network nodes also:
v Exchange information about the topology of the network. This information is
exchanged each time network nodes establish a connection or when there is a
change in the topology of the network (such as when a network node is
deactivated, brought on line, or when a link is congested or fails). When a
network node receives a topology update, it broadcasts this information to other
active and network nodes with which it has CP-CP sessions.
v Act as intermediate nodes, receiving session data from one adjacent node and
passing that data on to the next adjacent node along the route.
As a network node, the router can act as a server to attached APPN end nodes and
LEN end nodes and provide functions that include:
Directory services
The network node, communicating with other network nodes, can locate a
resource in the network on behalf of an APPN end node. The network node
also maintains a local directory of APPN and LEN end node resources that
it can search on behalf of an attached APPN end node, attached LEN end
node, or other network nodes.
Topology and Routing services
At the request of an APPN end node, the network node dynamically
determines the route from an origin logical unit (LU) to a destination LU in
the network. The network node also maintains information on other network
nodes and the routes to those nodes. The route is based on the current
topology of the network.
Management services
The network node can pass
alert
conditions to a designated focal point to
allow centralized problem management. The network node is responsible
for processing alert conditions for all the resources in its domain. “Managing
a Network Node” on page 17 describes this process.
APPN End Nodes
An APPN end node provides limited directory, routing, and management services
for logical units (LUs) associated with the node. An APPN end node selects a
network node to be its network node server. If the network node agrees to act as
the APPN end node’s server, the end node can register its local resources with the
network node. This enables the network node server to intercept and pass along
search requests for resources located on the APPN end node.
The APPN end node and its network node server communicate by establishing
CP-CP sessions. An APPN end node may be connected to a number of network
nodes, but only one of these nodes acts as the APPN end node’s server at any one
time.
The APPN end node forwards all requests for unknown resources to the network
node server. The network node server, in turn, uses its search facilities to locate the
requested resource and calculate a route from the APPN end node to the resource.
APPN
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MRS V3.2 Protocol Config Ref Vol 2