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Overview of IBM Networking
CMCC Adapter Features for SNA Environments
BC-248
Cisco IOS Bridging and IBM Networking Configuration Guide
78-11737-02
Cisco Multipath Channel
CMPC is Cisco System’s implementation of IBM’s MultiPath Channel (MPC) feature on Cisco 7500,
Cisco 7200, and Cisco 7000 with RSP7000 series routers. CMPC allows VTAM to establish
Advanced-Peer-to-Peer Networking (APPN) connections using both High Performance Routing (HPR)
and Intermediate Session Routing (ISR) through channel-attached router platforms.
Routers configured for CMPC can be deployed in Parallel MVS Systems Complex (sysplex)
configurations.
CMPC can be used to establish an APPN connection between VTAM and the following types of APPN
nodes:
• VTAM on another host that is channel-attached to the same CMCC adapter
• VTAM on another host that is channel-attached to a different CMCC adapter in the same router
• TN3270 server using Dependent LU Requester (DLUR) in the same CMCC adapter
• SNASw in the router with the CMCC adapter
• Other APPN nodes external to the CMCC adapter and router such as Communications Server/2,
AS/400, other LAN- or WAN-attached VTAM hosts, or remote routers
One read subchannel and one write subchannel are supported for each MPC TG. The read subchannel
and write subchannel may be split over two physical channel connections on the same CMCC adapter.
CMPC insulates VTAM from the actual network topology. The MPC protocols are terminated on the
CMCC adapter and converted to LLC protocols. After they are converted to LLC protocols, other Cisco
features can be used to connect VTAM to other APPN nodes in the network. CMPC can be used in
conjunction with DLSw+, RSRB, SR/TLB, SRB, SDLLC, QLLC, ATM LAN emulation, and FRAS host
to provide connectivity to VTAM.
CMPC supports connections to PU 2.1 nodes: APPN NN, APPN EN, and LEN. Subarea connections are
not supported.
The CMPC feature can coexist with the CLAW, TCP/IP Offload, CSNA, CMPC+, and TN3270 server
features on the same CMCC adapter.
For details about configuring a CMCC adapter for CMPC, see the “Configuring CSNA and CMPC”
chapter of this guide.
TN3270 Server
TN3270 communications in a TCP/IP network consist of the following basic elements:
• TN3270 client—Emulates a 3270 display device for communication with a mainframe application
through a TN3270 server over an IP network. The client can support the standard TN3270 functions
(as defined by RFC 1576) or the enhanced functionality provided by TN3270E (defined in RFC
2355). TN3270 clients are available on a variety of operating system platforms.
• TN3270 server—Converts the client TN3270 data stream to SNA 3270 and transfers the data to and
from the mainframe.
• Mainframe—Provides the application for the TN3270 client and communicates with the
TN3270 server using VTAM.