ZyXEL GS1920 User Manual Page 336
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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GS1920 Series User’s Guide 336
CHAPTER 46
Troubleshooting
This chapter offers some suggestions to solve problems you might encounter. The potential
problems are divided into the following categories.
• Power, Hardware Connections, and LEDs
• Switch Access and Login
• Switch Configuration
46.1 Power, Hardware Connections, and LEDs
The Switch does not turn on. None of the LEDs turn on.
1 Make sure you are using the power adaptor or cord included with the Switch.
2 Make sure the power adaptor or cord is connected to the Switch and plugged in to an appropriate
power source. Make sure the power source is turned on.
3 Disconnect and re-connect the power adaptor or cord to the Switch.
4 If the problem continues, contact the vendor.
The ALM LED is on.
1 Disconnect and re-connect the power adaptor or cord to the Switch.
2 If the problem continues, contact the vendor.
One of the LEDs does not behave as expected.
1 Make sure you understand the normal behavior of the LED. See Section 3.3 on page 31.
2 Check the hardware connections. See Section 46.1 on page 336.
3 Inspect your cables for damage. Contact the vendor to replace any damaged cables.
- GS1920 Series 1
- User’s Guide 1
- IMPORTANT! 2
- READ CAREFULLY BEFORE USE 2
- Contents Overview 3
- Chapter 9 7
- Chapter 10 7
- Table of Contents 10
- GS1920 Series User’s Guide 10
- Table of Contents 11
- CHAPTER 1 19
- 1.1.1 Backbone Application 20
- 1.1.2 Bridging Example 20
- CHAPTER 2 24
- CHAPTER 3 27
- 3.1.2 Mini-GBIC Slots 28
- 3.1.2.2 Transceiver Removal 29
- 3.2 Rear Panel 30
- 3.3 LEDs 31
- 3.4.1 Side Panels 32
- Technical Reference 33
- CHAPTER 4 35
- 4.3 The Status Screen 36
- LINK DESCRIPTION 38
- 4.5 Switch Lockout 40
- 4.6 Resetting the Switch 41
- 4.8 Help 41
- CHAPTER 5 42
- 5.1.2 Setting Port VID 43
- 5.2 Configuring Switch 44
- Management IP Address 44
- CHAPTER 6 46
- 6.3.2 Creating a VLAN 50
- 6.3.3 Configuring DHCP Relay 52
- 6.3.4 Troubleshooting 53
- CHAPTER 7 54
- CHAPTER 8 59
- 8.3 General Setup 61
- 8.4 Introduction to VLANs 63
- 8.5 Switch Setup Screen 64
- 8.6 IP Setup 65
- 8.7 Port Setup 67
- 8.8 PoE Status 69
- 8.8.1 PoE Setup 71
- 8.9 Interface Setup 72
- 8.10 IPv6 73
- 8.10.1 IPv6 Interface Status 74
- Chapter 8 Basic Setting 76
- 8.10.2 IPv6 Configuration 77
- 8.10.3 IPv6 Global Setup 77
- 8.10.4 IPv6 Interface Setup 78
- 8.10.8 IPv6 Neighbor Setup 82
- 8.10.9 DHCPv6 Client Setup 83
- CHAPTER 9 85
- GARP Timers 86
- 9.1.2.2 Port VLAN Trunking 87
- 9.2 VLAN Status 88
- 9.2.1 VLAN Details 89
- 9.5 Subnet Based VLANs 92
- 9.6 Protocol Based VLANs 94
- Chapter 9 VLAN 98
- 9.8 Technical Reference 99
- CHAPTER 10 101
- CHAPTER 11 103
- LABEL DESCRIPTION 105
- CHAPTER 12 106
- Chapter 12 Filtering 107
- CHAPTER 13 108
- STP Terminology 109
- How STP Works 109
- STP Port States 110
- Multiple RSTP 110
- Multiple STP 110
- 13.11 Technical Reference 124
- 13.11.2 MST Region 125
- 13.11.3 MST Instance 126
- CHAPTER 14 127
- CHAPTER 15 129
- CHAPTER 16 131
- CHAPTER 17 133
- 17.2 Link Aggregation Status 134
- 17.5 Technical Reference 138
- CHAPTER 18 140
- 18.3.1 Guest VLAN 143
- Internet 143
- CHAPTER 19 146
- Chapter 19 Port Security 148
- CHAPTER 20 149
- 20.3 Classifier Example 153
- CHAPTER 21 154
- 21.3 Policy Example 157
- CHAPTER 22 158
- 22.2 Configuring Queuing 159
- CHAPTER 23 161
- IGMP Snooping and VLANs 162
- MVR Overview 162
- Types of MVR Ports 162
- MVR Modes 162
- 23.2 Multicast Setup 163
- 23.3 IPv4 Multicast Status 164
- Chapter 23 Multicast 166
- 23.4 IGMP Snooping VLAN 167
- News: 224.1.4.10 ~ 224.1.4.50 173
- Movie: 230.1.2.50 ~230.1.2.60 173
- CHAPTER 24 175
- 24.2 AAA Screens 176
- 24.3 RADIUS Server Setup 176
- 24.5 AAA Setup 180
- 24.6 Technical Reference 182
- VLAN Assignment 184
- VLAN ID 184
- Chapter 24 AAA 186
- CHAPTER 25 187
- 25.2 IP Source Guard 188
- 25.4 DHCP Snooping 190
- Chapter 25 IP Source Guard 192
- 25.6 ARP Inspection Status 198
- 25.10 Technical Reference 206
- 25.10.2.3 Syslog 209
- CHAPTER 26 210
- 26.2 Loop Guard Setup 212
- CHAPTER 27 214
- CHAPTER 28 218
- 28.1.2.2 Sub-Option Format 219
- 28.1.2.3 Port State 220
- 28.2 The PPPoE Screen 221
- 28.3.1 PPPoE IA Per-Port 222
- 28.3.3 PPPoE IA for VLAN 225
- Chapter 28 PPPoE 226
- CHAPTER 29 227
- Detect screen 229
- Chapter 29 Error Disable 232
- CHAPTER 30 233
- CHAPTER 31 235
- 31.2 LLDP-MED Overview 236
- 31.3 LLDP Screens 237
- 31.4 LLDP Local Status 238
- 31.5 LLDP Remote Status 243
- Management 244
- (Dot1 and Dot3 TLV) 247
- (MED TLV) 248
- 31.6 LLDP Configuration 250
- 31.7 LLDP-MED Configuration 254
- 31.9 LLDP-MED Location 256
- CHAPTER 32 259
- Chapter 32 Static Route 261
- CHAPTER 33 262
- 33.2 Activating DiffServ 263
- CHAPTER 34 266
- 34.2 DHCP Configuration 267
- 34.3 DHCPv4 Status 268
- 34.4 DHCPv4 Relay 268
- 34.4.1.2 Sub-Option Format 269
- 192.168.1.100 277
- 172.16.10.100 277
- 34.6 DHCPv6 Relay 278
- CHAPTER 35 280
- Gratuitous-ARP 281
- ARP-Request 281
- 35.2 ARP Setup 282
- CHAPTER 36 284
- 36.2.1 Load Factory Default 285
- 36.2.2 Save Configuration 285
- 36.3 Firmware Upgrade 286
- 36.6 Tech-Support 288
- 36.7 Technical Reference 290
- 36.7.4 GUI-based FTP Clients 291
- 36.7.5 FTP Restrictions 292
- CHAPTER 37 293
- 37.3 Configuring SNMP 294
- 37.7 Technical Reference 303
- SNMP v3 and Security 304
- Supported MIBs 304
- SNMP Traps 304
- 37.7.2 Introduction to HTTPS 305
- 37.7.2.1 HTTPS Example 306
- 37.7.2.2 The Main Screen 309
- CHAPTER 38 311
- Chapter 38 Diagnostic 312
- CHAPTER 39 313
- 39.3 Syslog Server Setup 314
- CHAPTER 40 316
- 40.1.1 What You Can Do 317
- 40.4 Technical Reference 320
- CHAPTER 41 322
- Chapter 41 MAC Table 324
- CHAPTER 42 325
- CHAPTER 43 327
- CHAPTER 44 328
- CHAPTER 45 330
- Chapter 45 Neighbor Table 333
- Chapter 45 Neighbor Table 334
- CHAPTER 46 336
- 46.2 Switch Access and Login 337
- 46.3 Switch Configuration 339
- APPENDIX A 340
- Australia 345
- South Africa 345
- APPENDIX B 346
- Appendix B Common Services 347
- Appendix B Common Services 348
- APPENDIX C 349
- Global Address 350
- Unspecified Address 350
- Loopback Address 350
- Multicast Address 350
- Subnet Masking 351
- Interface ID 351
- Stateless Autoconfiguration 351
- Identity Association 352
- DHCP Relay Agent 352
- Prefix Delegation 353
- IPv6 Cache 353
- APPENDIX D 357
- ZyXEL Limited Warranty 358
- Safety Warnings 358
- CE Marking 358
- Appendix D Legal Information 359
- Numerics 360
- GS1920 Series User’s Guide368 368
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