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Overview of IBM Networking
CMCC Adapter Hardware
BC-242
Cisco IOS Bridging and IBM Networking Configuration Guide
78-11737-02
For a TCP/IP host connection, the router with CTRC routes the DRDA packets over TCP/IP without
protocol changes. To use this TCP/IP passthrough feature of CTRC, the host database version must
support direct TCP/IP access. Figure 111 illustrates such a configuration.
Figure 111 Cisco Router Configured with the CTRC Feature for DB2 Communications (TCP/IP Host
Network)
When configured for DB2 communications on a router, the CTRC feature enables desktop applications
to access data in remote databases located on IBM hosts. CTRC receives database access messages from
the client over a TCP/IP link. CTRC either converts the messages to SNA and sends them to the host
using APPC services provided by the Cisco SNA Switching Services, or routes the client messages to
the TCP/IP-enabled host without protocol changes.
Benefits of CTRC
CTRC provides TCP/IP end-users and servers with fast, reliable, and secure access to IBM DB2
databases using the SNA protocol. CTRC replaces expensive and hard to manage UNIX and NT
gateways for database access.
CTRC lets Windows or UNIX client applications call CICS transactions without requiring changes to
the client or host software.
In addition, CTRC provides Cisco 7200 and 7500 series routers with the functionality previously
available in CDBC, which gives ODBC client applications access to data in DB2 databases.
CMCC Adapter Hardware
A CMCC adapter is installed in a Cisco router to provide IBM channel attachment from the router to a
mainframe host. The Cisco family of CMCC adapters consists of two basic types of adapters:
• Channel Interface Processor (CIP)—Installed on Cisco 7000 with RSP7000 and Cisco 7500 series
routers
• Channel Port Adapter (CPA)—Installed on Cisco 7200 series routers
Each type of adapter (CIP or CPA) supports both ESCON and parallel channel attachment to the host
and can eliminate the need for a separate FEP.
All CMCC adapters support the full range of channel software applications available in the Cisco IOS
software including support for the Common Link Access to Workstation (CLAW) protocol, TCP/IP
offload, IP host backup, Cisco SNA (CSNA), Cisco Multipath Channel (CMPC), Cisco Multipath
Channel+ (CMPC+), and the TN3270 server.
Figure 112 shows the type of channel connections and environments supported by the CMCC adapters.
CTRCTCP/IP TCP/IP
DRDA server
DB2 databas
e
27133
RDBMS
ODBC client