© Copyright IBM Corp. 2002, 2005, 2006. All rights reserved. xxi
Summary of changes
This section describes the technical changes made in this edition of the book and
in previous editions. This edition may also include minor corrections and editorial
changes that are not identified.
Summary of Changes
for SG24-6298-02
for IBM Communication Controller Migration Guide
as created or updated on May 9, 2006.
January 2006, Third Edition
The primary driver for the second and third edition updates to the IBM
Communication Controller Migration Guide is the introduction of an important
new product family: the Communication Controller for Linux on zSeries V1.1 and
its follow-on product, the Communication Controller for Linux on System z9 and
zSeries V1.2. (Both share IBM product number 5724-J38 and are abbreviated
throughout this book as CCL). The CCL product enables you to run the Network
Control Program (NCP), the Network Routing Facility (NRF), and the X.25 NCP
Packet Switching Interface (NPSI) program products in your mainframe
(migrating them from your IBM 3745 Communication Controllers); therefore, the
CCL opens up a broad range of communication controller migration options that
were not previously available. These options are easily identified by the
distinctive CCL margin icon (as shown to the left of this paragraph) and are
discussed in greater detail, where applicable, in the chapters of this book.
The CCL product is introduced and discussed in Chapter 16, “Communication
Controller for Linux on System z9 and zSeries (CCL)” on page 283.
Most significant CCL capabilities
As “beauty is in the eye of the beholder,” what is significant (or insignificant) to
your organization depends on the specifics of your business, IT environment,
plans, and strategy. The CCL functional capabilities listed below, however,
provide alternatives where either no viable solution existed before (XRF, for
example) or where prior alternatives posed significant implementation challenges
(for example, SNI).
򐂰 SNA Network Interconnection (SNI): CCL provides an attractive option
because it eliminates the need for coordinated inter-organizational changes
xxii IBM Communication Controller Migration Guide
required by every other alternative (discussed in 5.3.4, “SNA Network
Interconnection (SNI)” on page 167).
򐂰 Token ring to Ethernet migration: The CCL can handle SNA traffic on Ethernet
LAN interfaces whereas the 3745 only supports SNA on token-ring LANs
(discussed in “Migrating from token ring to Ethernet” on page 117).
򐂰 Extended Recovery Facility (XRF): Prior to the introduction of CCL, no
functional alternative existed other than to make significant application
changes (discussed in 5.3.7, “Extended Recovery Facility (XRF)” on
page 180).
򐂰 Network Routing Facility (NRF): Prior to the introduction of CCL, no functional
alternative existed other than to make significant application changes
(discussed in 11.2.1, “Peer-to-peer connection of SNA devices (before PU
type 2.1)” on page 239).
򐂰 X.25 NCP Packet Switching Interface (NPSI): Using X.25 over TCP/IP (XOT)
technology and CCL V1.2 NPSI program product support, your mainframe
environment can support
all of the X.25 capabilities currently supported by
NPSI in your IBM 3745 communication controllers. Routers are used to
support the actual X.25 physical interfaces and XOT technology transports
the X.25 traffic over your TCP/IP network into your mainframes. Advantages
of the CCL NPSI approach over the previously available host XOT software
alternatives include comprehensive support of NPSI functional capabilities
and easier migration (discussed in “Supporting NPSI in your mainframe using
CCL” on page 200).
Other CCL capabilities
򐂰 “Replacing token-ring connectivity” on page 110: Token-ring OSA can now
support SNA
either to VTAM or to a CCL NCP.
򐂰 “Implementing CCL Ethernet high availability” on page 118: Provides a
high-level design for CCL high availability.
򐂰 4.3, “Network Node Processor functions and alternatives” on page 131: You
can now migrate SNA boundary function requirements from NNP DLUR to
CCL NCP support.
򐂰 5.3.2, “Multi-link transmission group (MLTG)” on page 161: CCL supports
token-ring and Ethernet LAN MLTGs.
򐂰 5.3.3, “SNA subarea addressing, routing, and boundary function (BF)” on
page 162: CCL gives you a way to migrate devices from your IBM 3745
Communication Controller hardware without having to move device
addresses from your NCP subarea into a VTAM subarea and while preserving
your NCP boundary function.
򐂰 5.3.7, “Extended Recovery Facility (XRF)” on page 180: CCL allows you to
continue to run NCP, supporting your XRF environment, on your mainframe.

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