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Advanced Peer-to-Peer Networking Overview

308963-14.00 Rev 00

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)

APN0003A

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