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Overview of IBM Networking
Cisco Transaction Connection
BC-241
Cisco IOS Bridging and IBM Networking Configuration Guide
78-11737-02
Figure 109 Cisco Router Configured with the CTRC Feature for CICS Communications
CTRC and DB2
CTRC enables Cisco routers to implement IBM’s DRDA over TCP/IP. The Cisco router with CTRC
exists in the TCP/IP network, and clients use a CTRC IP address and port on the router to connect to the
IBM host system that exists in either an SNA network or a TCP/IP network.
When CTRC is appropriately configured on a router, client-based ODBC applications can connect to the
following IBM D2 relational databases:
• DB2 for OS/390 (MVS)
• DB2 for Virtual Machine (VM) (SQL/DS)
• DB2 for Virtual Storage Extended (VSE) (SQL/DS)
• DB2 for OS/400
• DB2 Universal Database (UNIX, Windows, OS/2)
For an SNA host connection, the router with CTRC converts DRDA packets over TCP/IP to DRDA
packets over (APPC LU 6.2) and then routes them to DB2 databases. CTRC runs as a TCP/IP daemon
on the router, accepting DRDA client connections over TCP/IP. When a client connects to the database
on an IBM mainframe host, CTRC allocates an APPC conversation over SNA to an IBM server, and acts
as a gateway between DRDA over TCP/IP and DRDA over APPC.
Figure 110 illustrates how the Cisco router configured with the CTRC feature enables the exchange of
database information between ODBC client applications running DRDA in a TCP/IP network and a
DRDA-based IBM system that accesses DB2 relational data.
Figure 110 Cisco Router Configured with the CTRC Feature for DB2 Communications (SNA Host
Network)
CTRC
TCP/IP SNA
TCP/IP
CICS transaction
monitor
26062
SNA
SNA
APPC
(LU 6.2)
C
ICS client
TCP/IP
CTRC
TCP/IP SNA
TCP/IP
DRDA server
DB2 databas
e
26076
RDBMS
SNA
SNA
APPC
(LU 6.2)
ODBC client
TCP/IP