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Configuring DLSw Services
2-14
304233-A Rev. 00
DLSw Prioritization
Bay Networks routers enable you to prioritize DLSw traffic by configuring
priority queues for DLSw peers. You apply DLSw prioritization by using
outbound filters.
This section provides guidelines for implementing DLSw TCP-level
prioritization.
Protocol Prioritization Overview
Outbound traffic filters act on packets that the router sends on a synchronous
interface to a wide area network. Outbound traffic filter actions let you direct
traffic into delivery queues of varying precedence. Applying a priority queue
action to an outbound filter is called protocol prioritization. These outbound
filters are often called priority filters.
As a router operates, network traffic from a variety of sources converges at an
interface. Without protocol prioritization, the router transmits packets in a first in
first out (FIFO) order. Site Manager’s protocol prioritization features allow you to
instruct the router to use a different transmit order for specified ranges of packets
on an individual interface.
With protocol prioritization, the router sorts traffic into queues according to
priority filters that you configure. For most traffic, you configure priority filters on
an outbound interface. If a queue is full or you have configured an outbound drop
filter, the router discards (clips) the traffic. For DLSw traffic you can also create
priority queues for DLSw peers; the router cannot clip DLSw traffic.
The router holds the sorted packets in priority queues. It then uses a dequeuing
allocation algorithm to drain the queues and transmit traffic.
Priority queues do not affect traffic as it is entering the router, but rather affect the
sequence in which data leaves an interface. For this reason, protocol prioritization
is considered an outbound filter mechanism.
- 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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