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Configuring DLSw Services
1-2
DLSw Networking Overview
Data Link Switching (DLSw) provides a standards-based mechanism for reliably
transporting connection-oriented SNA and NetBIOS data across a network.
Originally defined in RFC 1434, DLSw resolves the issues associated with
transporting SNA and NetBIOS information across a multiprotocol backbone.
Specifically, DLSw:
• Prevents sessions from timing out due to slow network response time
• Automatically reroutes traffic around failed links
• Improves response time by reducing network overhead
• Enables multiple locations to interconnect without reconfiguring existing
bridges
Additionally, Bay Networks DLSw implementation provides several benefits
while retaining interoperability with other implementations of Data Link
Switching. These benefits include
• Bay Networks symmetric multiprocessor architecture, providing a highly
scalable and reliable implementation.
• Advanced flow control, ensuring that the router-based network delivers
information as reliably as existing SNA networks.
• Integrated SDLC-to-LLC2 conversion, enabling the customer to reduce the
cost of Front-End Processor (for example, 3745) ports, maintenance and
software.
• RFC 1490 (LLC2 over Frame Relay) support, enabling a Bay Networks router
to communicate across a Frame Relay network directly to a Front End
Processor or other device that supports this protocol.
• DLSw Prioritization, allowing preferred traffic to receive higher priority. Up
to ten priority levels can be defined, with weights assigned to each priority
queue. Prioritization uses standard DLSw TCP ports without affecting
multivendor interoperability.
The Bay Networks DLSw implementation is fully interoperable with the
IBM 6611 Network Processor and other RFC 1434 DLSw implementations.
- Configuring DLSw Services 1
- Bay Networks Software License 3
- (continued) 4
- Contents 5
- About This Guide 17
- Before You Begin 18
- InfoFACTS 19
- World Wide Web 19
- How to Get Help 20
- Conventions 20
- Acronyms 21
- Chapter 1 23
- Data Link Switching Overview 23
- DLSw Networking Overview 24
- DLSw Single-Switch Services 27
- DLSw Dual Switch Services 28
- SDLC Support 30
- Integrated SDLC Conversion 31
- Frame Relay Support 33
- DLSw Filtering 35
- DLSw and Related Protocols 36
- Chapter 2 39
- DLSw Implementation Notes 39
- Counting SRB LANs and Bridges 40
- Counting the IP Virtual Ring 41
- Counting the Internal LAN 44
- Counting the DLSw Bridge 45
- Parallel Data Paths 47
- Source Routing Bridge 48
- Multiple DLSw Peers on a LAN 49
- DLSw and Bridging Services 49
- DLSw with Translation Bridge 51
- Memory Requirements 52
- TCP Considerations 53
- Flow Control 54
- LLC2 Flow Control 55
- TCP Flow Control 55
- Performance 56
- Chapter 3 57
- DLSw Configuration Overview 57
- DLSw SAP Table 61
- DLSw Slot Table 62
- DLSw Configuration Overview 63
- DLSw Peer IP Table 65
- Simplifying the Peer IP Table 66
- Configuration Objects for SDLC 68
- Local Devices 70
- Optional Configuration Objects 71
- Chapter 4 75
- Enabling DLSw Services 75
- 2. Click on OK 76
- Mapping Frame Relay Addresses 79
- Adding Slot IP Addresses 81
- Adding DLSw Peer IP Addresses 83
- 4. Click on Done 85
- Subsequent DLSw Configuration 99
- Chapter 5 101
- Editing DLSw Parameters 101
- Accessing DLSw Parameters 102
- (Figure 5-1) and then 103
- Select Protocols➔DLSw➔Global 103
- 3. Click on OK 104
- Enabling a DLSw Interface 113
- 1. Click on Add 118
- 3. Click on Done 121
- Click on Add 122
- 2. Click on Delete 125
- Adding a DLSw SAP Table Entry 127
- Click on Done 130
- 3. Click on Delete 131
- 2. Select the entry to edit 141
- Click on Apply 142
- Deleting DLSw from the Node 154
- Chapter 6 155
- Using DLSw Prioritization 155
- DLSw Priority Queues 157
- The Dequeuing Process 158
- The Dequeue List 159
- Weighted Dequeuing Algorithm 159
- Queue Depth 161
- Select ENABLED 164
- Click on OK 164
- 2. Click on Template 177
- Appendix A 187
- DLSw Default Settings 187
- Appendix B 191
- Predefined DLSw Criteria 192
- DLSw Reference Points 192
- Length (bits) 193
- Specifying MAC Address Ranges 194
- Table B-6. SAP Codes 196
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