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Advanced Peer-to-Peer Networking Overview
114049 Rev. A
1-7
Figure 1-3. DLUR and DLUS in an APPN Network
Typically, in a large network, multiple DLUS nodes serve many DLUR nodes
distributed across the APPN backbone. A DLUR node can establish pipes with
several DLUS nodes, although a single PU2.0 device can receive traffic from only
one of them, because the device is only controlled by a single SSCP.
When the SSCP and the PU2.0 device exchange control flows, BINDs establish
the path that the LU-LU session traffic uses through the network. Since the BIND
flows independently of the CP-SVR pipe, the LU-LU traffic can take a different
path through the network (the DLUS calculates a route using the topology
database and class of service [COS] definitions). Refer to the “APPN Services”
section in this chapter for information on the topology database and COS
definitions.
PU2.0
APPN
backbone
CP-SVR pipe
VTAM
with DLUS
VTAM
SSCP sessions
(encapsulated in
CP-SVR pipe
APPN network node
with DLUR
LU-LU sessions
(natively routed by
APPN network)
APN0003
A
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