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Chapter 12
Configuring Other Routing Protocols
IBM SNA
The primary product in a FEP replacement project is a channel-attached router.
This router contains the mainframe channel connection hardware supporting
either a bus-and-tag or ESCON interface (or multiple interfaces). It also runs the
necessary channel protocol software and, in some cases, special software
designed to offload communication processing from the mainframe. For example,
the Cisco CIP and CPA both support TCP Offload, TCP Assist, CTRC, and
TN3270 Server features to offload mainframe cycles.
Desktop Consolidation
In a desktop consolidation, desktops running multiple protocol stacks are
simplified to utilize TCP/IP for access to all resources, including mainframes and
AS/400s. This consolidation can be accomplished using traditional emulators that
utilize TCP/IP instead of SNA for host communication, or it can be accomplished
by leveraging new browser-based access approaches.
Phases three and four of the SNA-to-IP integration require end users to access
host systems using TCP/IP.
The primary products in a desktop consolidation project are desktop devices,
desktop software, and new gateway servers. Other products that may be
considered for deployment are additional load-balancing domain name servers,
firewalls, and other security devices.
Terminal emulation is, by definition, a client/server implementation. That is, PCs
running terminal emulation software communicate with gateway software using
either a proprietary or a standard protocol that is at a higher level than the TCP/IP
transport. These gateways then communicate directly with the host applications
using standard SNA protocols.
Most terminal emulators offer multiple choices of gateway connectivity. The only
standard TCP/IP-based protocols for communication to mainframe and midrange
systems are TN3270(E) and TN5250, respectively. Many organizations are
implementing TN3270 and TN5250 because they are standards and they set the
stage for Web-to-host solutions.
Catalyst 4224 Access Gateway Switch Software Configuration Guide
12-11
OL-2031-02
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Troubleshooting
