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IBM SNA
Phase One: SNA Centric
Catalyst 4224 Access Gateway Switch Software Configuration Guide
12-6
This section contains the following topics:
Phase One: SNA Centric, page 12-6
•
Phase Two: IP Transport, page 12-7
•
Phase Three: IP Client, page 12-8
•
Phase Four: IP Centric, page 12-9
•
Summary of Four-Phase Model, page 12-9
•
An SNA-centric network has SNA, Advanced Peer-to-Peer Networking (APPN),
or APPN/High Performance Routing (HPR), protocols running on one or more
mainframe/midrange systems.
An SNA-centric network is a very high-speed and dynamic network when
compared to the traditional SNA network of the past. ACF/VTAM on the
mainframe includes APPN/HPR protocols to support dynamic rerouting around
failures and high-speed switching in the network. The mainframe complex, which
now comprises multiple complementary metal-oxide semiconductor (CMOS)
processors, implements Parallel Sysplex to provide the ultimate in redundancy
and session persistence.
The FEP has often been replaced by a high-performance, channel-connected
router such as the Channel Interface Processor (CIP) or the Channel Port Adapter
(CPA). The network backbone comprises high-speed switches (ATM,
Ethernet/Fast Ethernet/Gigabit Ethernet, or Token Ring) and routers running
APPN/HPR. Shared Token Ring LANs are being replaced with Token Ring or
Ethernet switching to the desktop, offering a dedicated LAN segment and
bandwidth to each end user.
Most desktops have PCs running advanced SNA client emulation software such
as TN3270 Server. Routers provide support, via features such as Dependent
Logical Unit Requester (DLUR) and downstream physical unit (DSPU)
concentration, to transport the traffic from the remaining traditional SNA
terminals and controllers.
Chapter 12
Configuring Other Routing Protocols
OL-2031-02
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