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Configuring DLSw Services
3-10 114063 Rev. A
Keepalive Time
The DLSw Keepalive Time parameter ensures that the TCP connection to a
remote router is active. You enable the parameter by specifying a nonzero value.
The Keepalive Time setting determines when to send data into the TCP pipe.
Since only one packet is sufficient to initiate the TCP retransmission procedure,
short intervals (less than 30 seconds) will use additional memory, CPU cycles, and
WAN resources unnecessarily. Low values (such as 1 second) do not significantly
decrease notification time, but significantly affect memory, CPU, and WAN
bandwidth utilization because each “keepalive” sends data into the TCP
connection, awaiting acknowledgment by the remote router.
In busy networks, the DLSw keepalive is not necessary. Frequent traffic for TCP
transmission performs the same function as a keepalive setting. For example,
frequent NetBIOS broadcast traffic functions as a TCP keepalive.
Reject Unconfigured Peers
The Reject Unconfigured Peers parameter allows you to limit the addition of new
DLSw sessions. If you set the parameter to Reject, the router establishes sessions
only with those routers that are defined in the DLSw Peer IP Table. If you set the
parameter to Accept, the router allows new DLSw sessions with any router that
requests a session.
Generally, routers connected to devices that initiate SNA/NetBIOS sessions
(usually routers located at remote sites in a hub configuration) must have a
configured Peer IP Table, allowing a parameter setting of Reject. Routers that
learn about remote locations and devices dynamically (such as central site routers)
do not have a configured Peer IP Table. These routers should have a Reject
Unconfigured Peers parameter setting of Accept.
DLSw Slot Table
Each slot on a Bay Networks router running DLSw acts as an independent data
link switch. You identify each slot by assigning a unique IP address for the slot.
This mapping is done in the DLSw Slot Table. Each entry in the table consists of a
DLSw slot number plus the address of the IP interface that you allocate for that
slot.
- Configuring DLSw 1
- Services 1
- Bay Networks Software License 3
- Contents 5
- 114063 Rev. A vii 7
- 114063 Rev. A ix 9
- 114063 Rev. A 10
- 114063 Rev. A xi 11
- 114063 Rev. A xiii 13
- 114063 Rev. A xv 15
- About This Guide 17
- Before You Begin 18
- Conventions 18
- Acronyms 19
- 114063 Rev. A xxi 21
- Bay Networks Customer Service 22
- World Wide Web 23
- Customer Service FTP 23
- Support Source CD 24
- CompuServe 24
- InfoFACTS 25
- How to Get Help 25
- Chapter 1 27
- Data Link Switching Overview 27
- DLSw Networking Overview 28
- RFC1795 Support 29
- 1-4 114063 Rev. A 30
- Single-Switch Services 32
- DSW0002A 33
- Dual-Switch Services 34
- SDLC Support 36
- 1-12 114063 Rev. A 38
- Primary SDLC Support 39
- Secondary SDLC Support 40
- 1-16 114063 Rev. A 42
- (b) Dual-Switch DLSw Networks 43
- Frame Relay Support 44
- DLSw Filtering 46
- Protocol Prioritization 47
- Chapter 2 49
- DLSw Implementation Notes 49
- DLSw Session Setup 50
- Combining DLSw and SRB 51
- 2-4 114063 Rev. A 52
- DSW0009A 52
- Virtual Rings 53
- DLSw and SRB On a Circuit 54
- DLSw and Bridging Services 55
- DLSw with Translation Bridge 56
- 2-10 114063 Rev. A 58
- Multiple DLSw Peers on a LAN 59
- Memory Requirements 60
- TCP Considerations 60
- Flow Control 61
- LLC2 Flow Control 62
- TCP Flow Control 62
- DLSw Prioritization 63
- Chapter 3 65
- DLSw Configuration Overview 65
- 114063 Rev. A 3-3 67
- 3-4 114063 Rev. A 68
- DLSW Global Parameters 69
- DLSw SAP Table 70
- SAP Table 71
- 3-8 114063 Rev. A 72
- DLSw Global Parameters 73
- DLSw Slot Table 74
- DLSw Configuration Overview 75
- 3-12 114063 Rev. A 76
- DLSw Peer IP Table 77
- Broadcast Peers 78
- Unconfigured Peers 79
- SDLC Line Parameters 80
- Local Devices 81
- 3-18 114063 Rev. A 82
- Boundary Access Node (BAN) 83
- 3-20 114063 Rev. A 84
- Configuring DLSw Packaging 85
- 3-22 114063 Rev. A 86
- Chapter 4 87
- Starting DLSw the First Time 88
- 4-4 114063 Rev. A 90
- 2. Click on OK 90
- Adding Slot IP Addresses 92
- 114063 Rev. A 4-7 93
- Adding DLSw Peer IP Addresses 94
- 114063 Rev. A 4-9 95
- 4-10 114063 Rev. A 96
- 1. Click on Add 96
- 114063 Rev. A 4-11 97
- 4-12 114063 Rev. A 98
- 99
- 100
- 101
- 101
- 102
- Starting DLSw 103
- 5. Click on Add 103
- Configuring DLSw Services 104
- 4-18 114063 Rev. A 104
- 105
- 4-20 114063 Rev. A 106
- 4-22 114063 Rev. A 108
- 109
- 4-24 114063 Rev. A 110
- 111
- 4-26 114063 Rev. A 112
- 4-28 114063 Rev. A 114
- Mapping Frame Relay Addresses 115
- 4-30 114063 Rev. A 116
- 3. Click on OK 116
- Chapter 5 119
- Editing DLSw Parameters 119
- Accessing DLSw Parameters 120
- (Figure 5-1) and then: 121
- (Figure 5-2) 121
- Click on OK 122
- 5-6 114063 Rev. A 124
- 5-8 114063 Rev. A 126
- 128
- 5-12 114063 Rev. A 130
- Enabling a DLSw Interface 131
- 5-16 114063 Rev. A 134
- (Figure 5-7) 135
- 114063 Rev. A 5-21 139
- 5-22 114063 Rev. A 140
- 3. Click on Done 140
- 5-28 114063 Rev. A 146
- 2. Click on Delete 146
- Adding a DLSw SAP Table Entry 147
- 114063 Rev. A 5-31 149
- Click on Done 150
- 3. Click on Delete 151
- 5-34 114063 Rev. A 152
- 4. Click on Done 152
- (Figure 5-19) 153
- 5-40 114063 Rev. A 158
- 2. Select the entry to edit 161
- Click on Apply 162
- 5-46 114063 Rev. A 164
- 114063 Rev. A 5-47 165
- 5-48 114063 Rev. A 166
- (continued) 169
- 5-52 114063 Rev. A 170
- (continued) 170
- 5-54 114063 Rev. A 172
- 5-56 114063 Rev. A 174
- 5-58 114063 Rev. A 176
- Deleting DLSw from the Node 177
- Chapter 6 179
- Using DLSw Prioritization 179
- 6-2 114063 Rev. A 180
- DLSw Priority Queues 181
- The Enqueuing Process 182
- The Dequeuing Process 182
- 114063 Rev. A 6-5 183
- 6-6 114063 Rev. A 184
- Queue Depth 185
- 6-8 114063 Rev. A 186
- 114063 Rev. A 6-11 189
- 6-12 114063 Rev. A 190
- 191
- 6-16 114063 Rev. A 194
- 114063 Rev. A 6-19 197
- 114063 Rev. A 6-21 199
- 6-24 114063 Rev. A 202
- 2. Click on Template 202
- 114063 Rev. A 6-29 207
- Configuration window 208
- (Figure 6-23) 208
- Appendix A 211
- DLSw Default Settings 211
- A-2 114063 Rev. A 212
- A-4 114063 Rev. A 214
- Appendix B 215
- Predefined DLSw Criteria 216
- DLSw Reference Points 216
- Length (bits) 217
- Specifying MAC Address Ranges 218
- B-6 114063 Rev. A 220
- Table B-6. SAP Codes 220
- Appendix C 221
- DLSw Troubleshooting 221
- *. Enabled by default 222
- Table C-2. DLSw State Table 223
- Sample Log Entries 224
- C-6 114063 Rev. A 226
- Reviewing the Network Log 228
- C-10 114063 Rev. A 230
- C-12 114063 Rev. A 232
- Troubleshooting DLSw 233
- C-16 114063 Rev. A 236
- Unexpected protocol action 238
- TCP open error 29 238
- DLSw Troubleshooting Tables 239
- C-20 114063 Rev. A 240
- C-22 114063 Rev. A 242
- C-24 114063 Rev. A 244
- C-26 114063 Rev. A 246
- Verifying the WAN Cabling 247
- 114063 Rev. A Index-1 249
- 114063 Rev. A Index-3 251
- 114063 Rev. A Index-5 253
- 114063 Rev. A Index-7 255
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