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Data Link Switching Overview
304233-A Rev. 00
1-17
SNA PU Descriptions
An SNA Physical Unit (PU) is a component of the network (or node) that manages
and monitors the resources (such as attached links and adjacent link stations)
associated with the node.
Several types of PUs exist. PU type 1.0, 2.0, or 2.1 devices require
boundary-function assistance from an adjacent subarea node. PU type 4.0 and 5.0
devices are subarea nodes. They use network addresses for routing and maintain
routing tables that reflect the configuration of the network.
PU 1.0 Support
PU type 1.0 devices include IBM 5251, 5294, 5394, and 5494 control unit
emulations. These devices are typically seen working with AS/400s. They do not
support connections on any LAN media. They use the SDLC protocol to
communicate.
PU 2.0 Support
PU type 2.0 devices include IBM 3174 and 3274 control units. Many PC client
software packages emulate this PU type.
PU 2.1 Support
PU type 2.1 devices include IBM 3174 and 3274 control units. These devices may
be seen as Advanced Peer-to-Peer Networking (APPN) low-entry networking
nodes.
PU 4.0 Support
PU type 4.0 devices include IBM 3720, 3725 and 3745 front end processors
(FEPs). These FEPs provide enhanced SNA services not provided by routers. The
router allows connection of the FEPs using SDLC or LLC. LAN-to-LAN,
SDLC-to-SDLC, LAN-to-SDLC, and SDLC-to-LAN connections are supported.
The FEPs communicate using FID4 data flows. FID4 is the SNA protocol format
used between two adjacent subarea nodes. It is supported by single-switch and
dual-switch operation of DLSw.
- Configuring 1
- DLSw Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 304233-A Rev. 00 10
- Before You Begin 17
- Text Conventions 18
- Acronyms 19
- Related Publications 20
- How to Get Help 22
- Chapter 1 23
- Data Link Switching Overview 23
- DLSw Networking Overview 24
- RFC 1795 Support 25
- UDP Explorer Frames 27
- RFC 2166 Multicast Support 28
- Figure 1-3. Multicast DLSw 32
- Single-Switch Services 35
- Dual-Switch Services 37
- SNA PU Descriptions 39
- LLC Support 41
- SDLC Support 41
- Primary SDLC Support 42
- Secondary SDLC Support 43
- Negotiable SDLC Support 45
- Frame Relay Support 46
- QLLC Support 48
- DLSw/APPN Boundary Function 48
- DLSw/APPN Components 50
- DLSw Router 52
- PU2.1 devices 53
- DLSw Backup Peer Support 54
- DLSw Filtering 54
- DLSw Prioritization 55
- Protocol Prioritization 55
- Chapter 2 57
- DLSw Implementation Notes 57
- DLSw and Other Subsystems 58
- Combining DLSw and SRB 58
- SRB network 59
- Virtual Rings 60
- DLSw and SRB on a Circuit 61
- DLSw and Bridging Services 62
- DLSw with Translation Bridge 63
- . Parallel 65
- Multiple DLSw Peers on a LAN 66
- Memory Requirements 66
- TCP Considerations 67
- Flow Control 67
- LLC2 Flow Control 68
- DLSw Packaging 69
- DLSw Priority Queues 71
- Nonordered Queues 73
- The Dequeue List 73
- Weighted Dequeuing Algorithm 74
- Backup Peers 77
- Chapter 3 79
- Starting DLSw 79
- Starting DLSw over Ethernet 83
- Starting DLSw over Token Ring 84
- Starting DLSw over SDLC 84
- Configuring LLC Services 90
- Deleting DLSw from a Node 92
- Chapter 4 93
- DLSw SAP Table 96
- Configuring DLSw Services 100
- (continued) 101
- (continued) 102
- DLSw Slot Table 103
- Customizing DLSw Services 105
- DLSw Peer IP Table 107
- Broadcast Peers 110
- Unconfigured Peers 111
- Configuring SDLC 115
- Services 115
- Editing a Local Device 116
- Configuring DLSw Packaging 122
- APPN Services 126
- Configuring DLSw Backup Peers 130
- Configuring Traffic 139
- Appendix A 141
- DLSw Service Parameters 141
- Caution: 143
- DLSw Basic Global Parameters 144
- 170
- 171
- 173
- 176
- Parameters 192
- VCCT Slot Parameter 199
- Adding Queue Parameters 212
- Appendix B 217
- Predefined DLSw Criteria 218
- DLSw Reference Points 218
- (bits) Length (bits) 219
- Specifying MAC Address Ranges 220
- Table B-6. SAP Codes 222
- Appendix C 223
- Troubleshooting DLSw 223
- * Enabled by default 224
- Table C-2. Log Messages 225
- Table C-3. DLSw State Table 226
- Table C-4. DLSw Event Table 227
- Sample Log Entries 228
- DLSw Session Setup 229
- Reviewing the Network Log 232
- Unexpected protocol action 242
- TCP open error 29 243
- DLSw Troubleshooting Tables 244
- IBMLAN.INI 248
- NBASE.exe 249
- SDLC.exe 249
- Verifying the WAN Cabling 251
- Flow Diagrams 253
- RFC 1795 255
- DLSw Version 2.0 256
- Version 2.0 Router) 258
- RFC 1490 264
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