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Cisco IOS for S/390 customers can use a 3745 front end processor (FEP) to attach channel interfaces directly to an IP network. The channel interface in this situation is configured in the Network Control Program (NCP) as a native IP element. The IP channel interface does not fall under control of VTAM.
Cisco IOS for S/390 uses the IBM CDLC protocol to implement support for the IP channel attachment capability. The 3745 FEP appears as a single device, operating in half-duplex mode. The CDLC protocol uses a single subchannel in half-duplex mode.
IP datagrams are passed from an MVS-based IP application over bus-and-tag or ESCON channels to a 3745 FEP. To Cisco IOS for S/390, the channel-attached NCP running native IP support looks like a channel-attached router.
The 3745 FEP cannot share the same bus-and-tag interface between SNA and IP traffic to the mainframe. The native IP attachment requires a dedicated 3745 channel adapter. If you are using ESCON with the 3746-900 frame, IP and SNA traffic can flow over the same channel connection if you create a separate NCP link station for the IP traffic.
The IBM references listed here provide additional information about the 3745 IP-Over-Channel feature.
This CDLC driver support assumes that you have either an Ethernet or a Token-Ring adapter installed in your FEP. This table lists the IBM software and hardware requirements. If you do not meet these levels you must check with IBM.
| Software / Hardware Component | Minimum Release Level | Additional Requirements, including APARs and PTFs |
|---|---|---|
| ACF/NCP | Version 7 Release 3 | IR30290, IR30569, IR30374, IR30430 |
| ACF/SSP | Version 4 Release 3 | IR30035, IR30113, IR30588, IR30729, IR30732 |
| ACF/VTAM | Version 3 Release 3 | OY64723 |
| 3745 | Dedicated type 6 or type 7 channel adapter for the IP traffic | |
| 3746-900 | Microcode EC D22510K (ECA 142) | |
| 3746-950 | The 3746-950 has its own control program. Configuration is done through a GUI, not through an NCP system generation. |
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