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Overview of IBM Networking
The IBM networking technologies described in this publication can be categorized as network-related
or host-related technologies. The IBM Networking section of the Cisco IOS Bridging and IBM
Networking Configuration Guide discusses the following network-related software components:
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RSRB, page 202
DLSw+, page 204
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STUN and BSTUN, page 211
LLC2 and SDLC Parameters, page 215
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IBM Network Media Translation, page 217
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SNA FRAS, page 223
NCIA, page 226
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ALPS, page 229
The IBM Networking section of the Cisco IOS Bridging and IBM Networking Configuration Guide
discusses the following host-related software and hardware components:
DSPU and SNA Service Point, page 230
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SNA Switching Services, page 232
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Cisco Transaction Connection, page 239
CMCC Adapter Hardware, page 242
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The following Cisco IOS software features are supported on the CMCC adapters:
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This overview chapter gives a high-level description of each technology. For configuration information,
refer to the corresponding chapters in this publication.
78-11737-02
Common Link Access to Workstation, page 245
TCP/IP Offload, page 245
IP Host Backup, page 246
Cisco Multipath Channel+, page 246
Cisco SNA, page 247
Cisco Multipath Channel, page 248
TN3270 Server, page 248
Cisco IOS Bridging and IBM Networking Configuration Guide
BC-201
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Related Manuals for IBM BC-201
Summary of Contents for IBM BC-201
- Page 1 Overview of IBM Networking The IBM networking technologies described in this publication can be categorized as network-related or host-related technologies. The IBM Networking section of the Cisco IOS Bridging and IBM Networking Configuration Guide discusses the following network-related software components: •...
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Page 2: Rsrb
If you bridge across Token Ring media, it is recommended that you do not use RSRB. Use SRB Note instead. Refer to the chapter “Configuring Source-Route Bridging” for more information. Cisco IOS Bridging and IBM Networking Configuration Guide BC-202 Virtual ring... -
Page 3: Configuration Considerations
The configuration of the LLC2 parameters for the local Token Ring interfaces can affect overall performance. Refer to the “Configuring LLC2 and SDLC Parameters” chapter for more details about fine-tuning your network through the LLC2 parameters. Cisco IOS Bridging and IBM Networking Configuration Guide 78-11737-02 BC-203... -
Page 4: Dlsw
SRB hop-count limits (SRB’s limit is seven) • Broadcast traffic (including SRB explorer frames or NetBIOS name queries) • Unnecessary traffic (acknowledgments and keepalives) • Data-link control timeouts • Cisco IOS Bridging and IBM Networking Configuration Guide BC-204 Overview of IBM Networking 78-11737-02... - Page 5 Users implement DLSw+ Version 2 for scalability if they are using multivendor DLSw devices with an IP multicast network. DLSw Version 2 requires complex planning because it involves configuration changes across an IP network. 78-11737-02 Cisco IOS Bridging and IBM Networking Configuration Guide DLSw+ BC-205...
- Page 6 Finally, DLSw+ provides a mechanism for dynamically searching a network for SNA or NetBIOS resources and includes caching algorithms that minimize broadcast traffic. Cisco IOS Bridging and IBM Networking Configuration Guide BC-206 Overview of IBM Networking...
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Page 7: Local Acknowledgment
If the sending host does not receive an acknowledgment of the frame it sent within the T1 time, it retries a few times (normally 8 to 10). If there is still no response, the sending host drops the session. 78-11737-02 Cisco IOS Bridging and IBM Networking Configuration Guide DLSw+ BC-207... - Page 8 Such frame duplication breaks the LLC2 protocol, resulting in the loss of sessions between the two IBM machines. One way to solve this time delay is to increase the timeout value on the end nodes to account for the maximum transit time between the two end machines.
- Page 9 All the frames acknowledged by the Cisco IOS software appear to the end hosts to be coming from the remote IBM machine. In fact, by looking at a trace from a protocol analyzer, one cannot say whether a frame was acknowledged by the local router or by a remote IBM machine. The MAC addresses and the RIFs generated by the Cisco IOS software are identical to those generated by the remote IBM machine.
- Page 10 SNA Switching Services (SNASw) through a Cisco IOS feature called virtual data-link control (VDLC). LNM over DLSw+ allows DLSw+ to be used in Token Ring networks that are managed by IBM’s LNM software. Using this feature, LNM can be used to manage Token Ring LANs, control access units, and Token Ring attached devices over a DLSw+ network.
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Page 11: Stun And Bstun
VDLC Figure 89 shows STUN configured in passthrough mode. In passthrough mode, the Figure 89 shows STUN configured in local acknowledgment mode. In local Cisco IOS Bridging and IBM Networking Configuration Guide STUN and BSTUN Data-link users CLSI Data-link controls... - Page 12 DECnet and SNA/SDLC traffic, this traffic now can be integrated into an enterprise backbone network. Supports local acknowledgment for direct Frame Relay connectivity between routers, without • requiring TCP/IP. Cisco IOS Bridging and IBM Networking Configuration Guide BC-212 SDLC session SNA session TCP session...
- Page 13 As an SDLC function, STUN fully supports the IBM SNA and allows IBM SDLC frames to be sent across the network media and shared serial links. illustrates a typical network configuration without STUN and the same network configured with STUN.
- Page 14 STUN and BSTUN Figure 90 shows the difference between an IBM network with STUN and one without STUN. Figure 90 IBM Network Configuration without STUN and with STUN Without STUN With STUN Cisco IOS Bridging and IBM Networking Configuration Guide...
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Page 15: Llc2 And Sdlc Parameters
By 78-11737-02 216. The features that require SDLC configuration and use SDLC parameters are Cisco IOS Bridging and IBM Networking Configuration Guide LLC2 and SDLC Parameters “The Cisco Implementation of 217. - Page 16 Routers using 4- or 16-Mbps Token Ring interfaces configured for SRB support Lan Network Manager (LNM) and provide all IBM bridge program functions. With LNM, a router appears as an IBM source-route bridge, and can manage or monitor any connected Token Ring interface.
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Page 17: Ibm Network Media Translation
SDLLC media translation enables a device on a Token Ring to communicate with a device on a serial • link. QLLC conversion enables an IBM device to communicate with an X.25 network without having to • install the X.25 software on local IBM equipment. - Page 18 In all these topologies, each IBM end node (the FEP and cluster controller) has no indication that its counterpart is connected to a different medium running a different protocol. The 37x5 FEP responds as if the 3x74 cluster controller were communicating over a Token Ring, whereas the 3x74 responds as though the 37x5 FEP were communicating over a serial line.
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Page 19: Other Considerations
Resolving Differences in LLC2 and SDLC Frame Size IBM nodes on Token Ring media normally use frame sizes greater than 1 KB, whereas the IBM nodes on serial lines normally limit frame sizes to 265 or 521 bytes. To reduce traffic on backbone networks and provide better performance, Token Ring nodes should send frames that are as large as possible. - Page 20 IBM Network Media Translation QLLC Conversion Qualified Logical Link Control (QLLC) is a data link protocol defined by IBM that allows SNA data to be transported across X.25 networks. (Although IBM has defined other protocols for transporting SNA traffic over an X.25 network, QLLC is the most widely used.) conversion provides data link layer support for SNA communication.
- Page 21 37x5 Figure 96, each IBM end node has no indication that its counterpart is connected to a different medium running a different protocol. The 37x5 FEP responds as if the 3x74 cluster controller were communicating over a Token Ring, whereas the 3x74 responds as though the 37x5 FEP were communicating over an X.25 network.
- Page 22 X.25 network, a remote device can use each SVC for some bounded period of time and then relinquish it for use by another device. Using a PVC is very much like using a leased line. Cisco IOS Bridging and IBM Networking Configuration Guide BC-222...
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Page 23: Sna Fras
To use the QLLC conversion feature, a router must have a physical link to an X.25 public data network (PDN). It must also have an SRB/RSRB path to an IBM FEP. This link could be a Token Ring or Ethernet interface, or even FDDI, if RSRB is being used. - Page 24 Relay connection is defined as a switched resource similar to a Token Ring BNN link. Because the frame format does not include link addresses to allow the NCP to distinguish among SNA devices on the same Cisco IOS Bridging and IBM Networking Configuration Guide BC-224...
- Page 25 BAN works for devices attached by either Token Ring or Ethernet. 78-11737-02 Q.922 address 0x03 0x00 SNAP 0x80 00x0 OUI 0x80-C2 (bridged) PID 0x00-09 Frame control SSAP Control SNA data Cisco IOS Bridging and IBM Networking Configuration Guide SNA FRAS BC-225...
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Page 26: Ncia
Native Client Interface Architecture (NCIA) is a new software architecture introduced by Cisco to make accessing IBM SNA applications over routed internetworks more scalable and flexible. NCIA is a component of the Cisco IOS software. The architecture is intended to combine the benefits of the native SNA interface at end stations and mainframes with those of TCP/IP across the network backbone. - Page 27 NetBIOS explorers to a client, even when the client is registered. 78-11737-02 DLSw+ DLSw local switch LLC2 NCIA server Token Ring TCP/IP Cisco IOS Bridging and IBM Networking Configuration Guide Figure 101), where the NCIA server is a DSPU RSRB NCIA client TCP/IP NDLC...
- Page 28 LLC2 connections that must be supported by the central site routers. Figure 102 NCIA Server Provides Extended Scalability to Support Large Networks Mainframe with FEP Cisco IOS Bridging and IBM Networking Configuration Guide BC-228 RSRB backbone Overview of IBM Networking Figure 102).
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Page 29: Alps
P1024B Airline Control (ALC) or P1024C (UTS) protocol, the TCP/IP-based MATIP protocol conversion, and the TCP/IP access to the mainframe. 78-11737-02 RSRB/DLSw+ Token backbone Ring Cisco Router peers Cisco IOS Bridging and IBM Networking Configuration Guide Figure 103 illustrates, a Client workstation Token Ring DLSw+ NCIA server... -
Page 30: Dspu And Sna Service Point
SNA host. In the Cisco IOS software, you can configure the host connection and show the status of this connection. At the SNA host, you can use the NetView operator’s console to view alerts and to send and receive Cisco syntax commands to the Cisco device. Cisco IOS Bridging and IBM Networking Configuration Guide BC-230 Remote... - Page 31 8 LUs Upstream PU (PU type 2) LU routing algorithm Downstream PU B (PU type 5) Cisco IOS Bridging and IBM Networking Configuration Guide DSPU and SNA Service Point PU 2 + 3 LUs Token Ring PU 5 PU 2 + 1 LU...
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Page 32: Sna Switching Services
Reduced Configuration Requirements, page 233 • Network Design Simplicity, page 233 Improved Availability, page 233 • Increased Management Capabilities, page 233 • Architectural Compliance, page 233 • Cisco IOS Bridging and IBM Networking Configuration Guide BC-232 Overview of IBM Networking 78-11737-02... - Page 33 PU 2.0. It also provides full DLUR support to allow dependent PU and LU traffic to flow over the APPN network to SNA data hosts. 78-11737-02 Cisco IOS Bridging and IBM Networking Configuration Guide Benefits of SNASw BC-233...
- Page 34 Supports all types of SNA application traffic including traditional 3270 and peer LU 6.2. • Supports an OS/390 Parallel Sysplex configuration, working in conjunction with the IBM • Communications Server for S/390 (formerly VTAM) and the MVS Workload Manager, to provide higher availability in the data center using the High Performance Routing (HPR) feature.
- Page 35 The Cisco IP prioritization technologies, such as weighted fair queueing (WFQ), prioritize the traffic through the IP network. EE support on the IBM Communications Server for S/390 allows users to build highly reliable SNA routed networks that run natively over an IP infrastructure directly to the Enterprise servers.
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Page 36: Usability Features
BTU for that device to the MAXDATA value. DLUR Connect-Out SNASw can receive connect-out instructions from the IBM Communications Server for S/390. This function allows the system to dynamically connect-out to devices that are configured on the host with the appropriate connect-out definitions. This feature allows connectivity to SNA devices in the network that were traditionally configured for connect-out from the host. - Page 37 Interprocess Signal Tracing The SNASw internal information is traced in binary form, offering valuable detailed internal information to Cisco support personnel. This information helps diagnose suspected defects in SNASw. 78-11737-02 Management Enhancements Cisco IOS Bridging and IBM Networking Configuration Guide BC-237...
- Page 38 Token Ring interfaces that can connect to a specific LAN, this technology allows configuration of multiple MAC addresses, which respond to SNA requests over the Cisco IOS Bridging and IBM Networking Configuration Guide BC-238...
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Page 39: Cisco Transaction Connection
Cisco Transaction Connection This section contains the following topics: • CTRC and CICS, page 240 • CTRC and DB2, page 241 • Benefits of CTRC, page 242 78-11737-02 Cisco Transaction Connection Cisco IOS Bridging and IBM Networking Configuration Guide BC-239... - Page 40 CTRC runs as a TCP/IP daemon on the router, accepting ISC client connections over TCP/IP. When a client connects to a CICS region on an IBM mainframe host, CTRC allocates an APPC conversation over SNA to an IBM server and acts as a gateway between ISC over TCP/IP and ISC over APPC. Figure 109 illustrates how CTRC lets CICS client applications on TCP/IP networks interact with CICS transaction monitoring systems on IBM hosts.
- Page 41 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.
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Page 42: Cmcc Adapter Hardware
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: •... - Page 43 (OIR), which allows you to install or remove CIPs while the system is operating. Channel Port Adapter The CPA is available for the Cisco 7200 series routers. The CPA expands the value of the Cisco IBM channel solution by providing channel connectivity to mid-range mainframe configurations.
- Page 44 Channel interfaces Maximum number of interfaces 2 Maximum memory Cisco IOS release support Virtual port number Channel interface state tracking (HSRP, SNMP alerts) Cisco IOS Bridging and IBM Networking Configuration Guide BC-244 ECPA Cisco 7500 Cisco 7200 Cisco 7000 with RSP7000...
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Page 45: Supported Environments
Offload Support” chapter in this publication. TCP/IP Offload The Cisco TCP/IP offload feature supports IBM’s MVS, VM, and Transaction Processing Facility (TPF) operating systems. The TCP/IP offload feature for CMCC adapters delivers the same function as the TCP/IP offload function on the 3172 Interconnect Controller (Model 3), but with increased performance. -
Page 46: Ip Host Backup
CLAW and TCP/IP Offload Support” chapter in this publication. Cisco Multipath Channel+ CMPC+ is the Cisco implementation of IBM’s MPC+ feature. The CMPC+ feature supports the MPC+ features and protocols necessary to support IP. CMPC+ enables High Performance Data Transfer (HPDT). -
Page 47: Cisco Sna
Cisco 7200, and Cisco 7000 with RSP7000 series routers, using CMCC adapters (over both ESCON and parallel interfaces). As an IBM 3172 replacement, a CMCC adapter in a Cisco router supports the External Communications Adapter (XCA) feature of the Virtual Telecommunications Access Method (VTAM). -
Page 48: Tn3270 Server
CMCC Adapter Features for SNA Environments 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. - Page 49 CMPC support, see the “Configuring CSNA and CMPC” chapter in this publication. 78-11737-02 TN3270 server TCP/IP Cisco IOS Bridging and IBM Networking Configuration Guide CMCC Adapter Features for SNA Environments Figure 113. Functionally, it is useful to view TN3270 client...
- Page 50 RSP7000, Cisco 7500 series router, or a Cisco 7200 router. For details about configuring the TN3270 server on a CMCC adapter, see the “Configuring the TN3270 Server” chapter in this publication. Cisco IOS Bridging and IBM Networking Configuration Guide BC-250 78-11737-02...