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Configuring Line Services
10-12 115391-A Rev. A
Monitoring PPP Link Quality
To ensure that the router can successfully transfer data, PPP monitors the quality
of the point-to-point link with Link Quality Monitoring (LQM) and Link Quality
Report (LQR) packets. PPP supports LQM over standard synchronous interfaces
only. PPP does not support LQM over High-speed Serial Interfaces (HSSI).
BayStream software, however, does support LQM and LQR over HSSI interfaces.
When you enable link quality monitoring through the Link Quality Protocol, you
are turning on monitoring only for the local router. For link quality monitoring to
be operational, it only has to be enabled on one side of the link. If two routers are
configured for different link quality reporting periods, they negotiate to the lower
value, so that the LQR period will be the same on both sides of the link.
LQR packets contain counters of incoming and outgoing data packets for the
routers on each side of the link. Each time a router receives an LQR packet, PPP
uses that packet to calculate the outbound link quality (the percentage of packets
the router transmitted that its peer successfully receives) and the inbound link
quality (the percentage of packets that the peer transmitted that this router
successfully receives).
After five LQR reporting periods, PPP averages the inbound and outbound link
quality and compares these values against a user-specified threshold. This is a
rolling average. After the first five LQR reporting periods, PPP acquires the data
from the next period and drops the oldest data. Then it computes the link quality
average for that set of five LQR periods, and so on.
If either the inbound or outbound link quality average drops below the threshold,
PPP brings down the link. The driver software automatically brings the link back
up and renegotiates the connection. PPP monitors the link control packets flowing
over the connection and resumes network control protocol packet traffic when the
link quality improves.
Note: PPP uses LQM and LQR only if you set the Link Quality Protocol
parameter to LINKQR. The default is None.
- Configuring Line 1
- Services 1
- Bay Networks Software License 3
- Contents 5
- 115391-A Rev. A 10
- About This Guide 21
- <ip_address> 22
- Acronyms 23
- World Wide Web 29
- Customer Service FTP 29
- Support Source CD 30
- CompuServe 30
- InfoFACTS 31
- How to Get Help 31
- Chapter 1 33
- Getting Started 33
- 1-2 115391-A Rev. A 34
- Click on Edit 35
- Select Lines > Edit Lines 36
- Chapter 2 39
- About Line Protocols 39
- Ethernet Overview 40
- 2-4 115391-A Rev. A 42
- FDDI Overview 43
- 2-6 115391-A Rev. A 44
- 2-8 115391-A Rev. A 46
- Station Timers 48
- SMT Frame Services 50
- Token Ring Overview 52
- Figure 2-7. Token Ring LAN 53
- Overview of WAN Protocols 54
- HSSI Overview 55
- ISDN Overview 55
- MCE1 and MCT1 Overview 56
- Synchronous Overview 56
- T1 Overview 57
- 2-20 115391-A Rev. A 58
- Figure 2-8. D4 Frame 58
- 2-22 115391-A Rev. A 60
- Figure 2-10. Bipolar Format 60
- Chapter 3 63
- Customizing LAN Interfaces 63
- Setting the BofL Interval 64
- 3-4 115391-A Rev. A 66
- 3-6 115391-A Rev. A 68
- Editing FDDI Lines 69
- 115391-A Rev. A 3-9 71
- 3-10 115391-A Rev. A 72
- 3-12 115391-A Rev. A 74
- Editing FDDI Path Attributes 76
- Editing FDDI Port Attributes 78
- Editing Token Ring Lines 79
- Specifying the Ring Speed 80
- Chapter 4 81
- Customizing WAN Interfaces 81
- 4-2 115391-A Rev. A 82
- Setting the Framing Mode 84
- Editing ATM FRE-2 Lines 86
- 4-8 115391-A Rev. A 88
- Editing E1 Lines 90
- Assigning Channel Functions 92
- Editing HSSI Lines 93
- Editing T1 Lines 96
- Setting the T1 Frame Type 97
- 4-18 115391-A Rev. A 98
- Chapter 5 101
- Customizing Synchronous and 101
- Asynchronous Interfaces 101
- Specifying the Start Protocol 102
- 115391-A Rev. A 5-3 103
- Setting the Idle Timer 104
- Setting the Baud Rate 104
- 115391-A Rev. A 5-5 105
- Editing Synchronous Lines 106
- 115391-A Rev. A 5-7 107
- Setting the BofL Timeout 108
- Setting the Clock Source 109
- Configuring Line Services 110
- 5-10 115391-A Rev. A 110
- Setting the Signal Mode 111
- 5-12 115391-A Rev. A 112
- Setting Minimum Frame Spacing 113
- 5-14 115391-A Rev. A 114
- 115391-A Rev. A 5-15 115
- Setting the CRC Size 116
- Setting the Signaling Method 116
- Setting the Line Coding 117
- Setting the Retry Count 118
- Setting the Link Idle Timer 118
- Setting the Cable Type 119
- 5-20 115391-A Rev. A 120
- Setting Sync Priority 121
- Configuring KG84A Security 121
- 5-22 115391-A Rev. A 122
- 115391-A Rev. A 5-23 123
- 5-24 115391-A Rev. A 124
- Chapter 6 125
- 6-2 115391-A Rev. A 126
- Setting the Clock Parameters 127
- Customizing MCE1 Port Details 128
- 115391-A Rev. A 6-5 129
- 6-6 115391-A Rev. A 130
- Customizing MCT1 Port Details 131
- 6-8 115391-A Rev. A 132
- 115391-A Rev. A 6-9 133
- 6-10 115391-A Rev. A 134
- 115391-A Rev. A 6-11 135
- 6-12 115391-A Rev. A 136
- 115391-A Rev. A 6-13 137
- Defining Logical Lines 139
- 115391-A Rev. A 6-17 141
- Customizing Logical Lines 142
- 115391-A Rev. A 6-19 143
- 6-20 115391-A Rev. A 144
- 115391-A Rev. A 6-21 145
- 6-22 115391-A Rev. A 146
- 115391-A Rev. A 6-23 147
- 6-24 115391-A Rev. A 148
- Assigning Timeslots 149
- 115391-A Rev. A 6-27 151
- 115391-A Rev. A 6-29 153
- Chapter 7 155
- Configuring Multiline Services 155
- Multiline Example 156
- Types of Multiline Circuits 157
- Grouping Data Paths 158
- Multiline Traffic Distribution 159
- Frame Relay Considerations 160
- Bandwidth-on-Demand (BOD) 160
- Configuring Multiline 161
- 115391-A Rev. A 7-9 163
- 115391-A Rev. A 7-11 165
- 115391-A Rev. A 7-13 167
- 115391-A Rev. A 7-15 169
- Select File > Exit 170
- 115391-A Rev. A 7-17 171
- Chapter 8 173
- Resource Manager 173
- Line Resource Manager 174
- Starting the LRM 175
- 115391-A Rev. A 8-5 177
- Configuring the LRM 178
- 115391-A Rev. A 8-7 179
- 8-8 115391-A Rev. A 180
- 115391-A Rev. A 8-9 181
- 8-10 115391-A Rev. A 182
- 115391-A Rev. A 8-11 183
- Deleting LRM Services 184
- 115391-A Rev. A 8-13 185
- Chapter 9 187
- Starting PPP 187
- PPP Tasks 188
- • Configure echo requests 189
- Chapter 10 191
- PPP Concepts 191
- 10-2 115391-A Rev. A 192
- Initializing a PPP Interface 193
- 10-4 115391-A Rev. A 194
- 10-6 115391-A Rev. A 196
- One-Way Authentication 197
- Datagram Encapsulation 198
- PPP Dial Services Support 199
- PPP Multiline 200
- Monitoring PPP Link Quality 202
- PPP Data Compression 204
- 10-16 115391-A Rev. A 206
- Detecting Loopback Conditions 207
- PPP Interoperability 208
- Chapter 11 209
- Customizing PPP 209
- Setting Up Remote Addresses 210
- Customizing PPP Lines 211
- Editing PPP Line Parameters 212
- Setting the Restart Timer 213
- 11-6 115391-A Rev. A 214
- 11-8 115391-A Rev. A 216
- Customizing PAP 217
- 11-10 115391-A Rev. A 218
- Customizing CHAP 219
- 11-12 115391-A Rev. A 220
- 11-14 115391-A Rev. A 222
- 11-16 115391-A Rev. A 224
- Disabling Loopback Checking 225
- Deleting PPP 225
- Appendix A 227
- Parameters 227
- 228
- 229
- 229
- 230
- A-6 115391-A Rev. A 232
- A-10 115391-A Rev. A 236
- 239
- 239
- Editing WAN Line Services 240
- 241
- A-16 115391-A Rev. A 242
- A-18 115391-A Rev. A 244
- 248
- 252
- 253
- 254
- A-30 115391-A Rev. A 256
- 257
- 258
- 259
- A-34 115391-A Rev. A 260
- 262
- 264
- 266
- 266
- 267
- 271
- 273
- 275
- A-50 115391-A Rev. A 276
- 277
- 279
- 284
- 285
- 285
- 287
- A-64 115391-A Rev. A 290
- 292
- 295
- 295
- 296
- 298
- 299
- A-74 115391-A Rev. A 300
- 301
- A-76 115391-A Rev. A 302
- 303
- 303
- A-78 115391-A Rev. A 304
- 306
- Editing PPP Parameters 307
- A-84 115391-A Rev. A 310
- A-86 115391-A Rev. A 312
- 313
- A-88 115391-A Rev. A 314
- 316
- A-92 115391-A Rev. A 318
- Appendix B 323
- Asynchronous Line Parameters 324
- ATM ARE Line Parameters 324
- ATM FRE-2 Line Parameters 325
- E1 Line Parameters 326
- FDDI Line Parameters 327
- HSSI Line Parameters 328
- MCE1 Line Parameters 329
- B-8 115391-A Rev. A 330
- MCT1 Line Parameters 331
- B-10 115391-A Rev. A 332
- (continued) 333
- Multiline Parameters 334
- PPP Parameters 334
- (continued) 335
- Synchronous Line Parameters 336
- T1 Line Parameters 338
- Token Ring Line Parameters 338
- 115391-A Rev. A Index-1 339
- 115391-A Rev. A Index-3 341
- 115391-A Rev. A Index-5 343
- 115391-A Rev. A Index-7 345
- 115391-A Rev. A Index-9 347
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