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Chapter 32 DHCP
GS2200-8/24 User’s Guide
245
DHCP Relay
Configure DHCP relay on the Switch if the DHCP clients and the DHCP server are not in the same
broadcast domain. During the initial IP address leasing, the Switch helps to relay network
information (such as the IP address and subnet mask) between a DHCP client and a DHCP server.
Once the DHCP client obtains an IP address and can connect to the network, network information
renewal is done between the DHCP client and the DHCP server without the help of the Switch.
The Switch can be configured as a global DHCP relay. This means that the Switch forwards all DHCP
requests from all domains to the same DHCP server. You can also configure the Switch to relay
DHCP information based on the VLAN membership of the DHCP clients.
DHCP Relay Agent Information
The Switch can add information about the source of client DHCP requests that it relays to a DHCP
server by adding Relay Agent Information. This helps provide authentication about the source of
the requests. The DHCP server can then provide an IP address based on this information. Please
refer to RFC 3046 for more details.
The DHCP Relay Agent Information feature adds an Agent Information field to the Option 82
field. The Option 82 field is in the DHCP headers of client DHCP request frames that the Switch
relays to a DHCP server.
Relay Agent Information can include the System Name of the Switch if you select this option.
You can change the System Name in Basic Settings > General Setup.
The following describes the DHCP relay information that the Switch sends to the DHCP server:
32.2 DHCP Status
Click IP Application > DHCP in the navigation panel. The DHCP Status screen displays.
Figure 157 IP Application > DHCP Status
Table 97 Relay Agent Information
FIELD LABELS DESCRIPTION
Slot ID (1 byte) This value is always 0 for stand-alone switches.
Port ID (1 byte) This is the port that the DHCP client is connected to.
VLAN ID (2 bytes) This is the VLAN that the port belongs to.
Information (up to 64 bytes) This optional, read-only field is set according to system name set in
Basic Settings > General Setup.
- GS2200-8/24 Series 1
- About This User's Guide 3
- Need More Help? 4
- Customer Support 4
- Document Conventions 6
- Document Conventions 7
- Safety Warnings 8
- Contents Overview 10
- GS2200-8/24 User’s Guide 10
- Table of Contents 11
- Table of Contents 13
- User’s Guide 21
- CHAPTER 1 23
- 1.1.2 Bridging Example 24
- CHAPTER 2 27
- CHAPTER 3 31
- 3.2.1 Console Port 33
- 3.2.3 Mini-GBIC Slots 34
- 3.2.4 Power Connector 35
- 3.3 LEDs 36
- Technical Reference 37
- CHAPTER 4 39
- 4.3 The Status Screen 40
- LINK DESCRIPTION 42
- 4.5 Switch Lockout 44
- 4.6 Resetting the Switch 45
- 4.8 Help 46
- CHAPTER 5 47
- 5.1.2 Setting Port VID 48
- 5.2 Configuring Switch 49
- Management IP Address 49
- CHAPTER 6 51
- Total number of bindings: 1 54
- 6.3.2 Creating a VLAN 55
- 6.3.3 Configuring DHCP Relay 58
- 6.3.4 Troubleshooting 59
- CHAPTER 7 60
- 7.2 Port Status Summary 61
- Table 7 Status (continued) 62
- Port Info 63
- CHAPTER 8 66
- 8.2 System Information 67
- GS2200-24P that have fans 68
- 8.3 General Setup 69
- 8.4 Introduction to VLANs 70
- 8.5 Switch Setup Screen 71
- 8.6 IP Setup 72
- Chapter 8 Basic Setting 74
- 8.7 Port Setup 75
- 8.8 PoE Status 76
- 8.8.1 PoE Setup 79
- Chapter 8 Basic Setting 81
- CHAPTER 9 83
- GARP Timers 84
- 9.1.2.2 Port VLAN Trunking 85
- 9.2 VLAN Status 86
- 9.2.1 VLAN Details 87
- Chapter 9 VLAN 89
- 9.5 Subnet Based VLANs 91
- 9.6 Protocol Based VLANs 94
- Chapter 9 VLAN 98
- 9.8 Technical Reference 99
- CHAPTER 10 101
- CHAPTER 11 103
- LABEL DESCRIPTION 106
- CHAPTER 12 107
- Chapter 12 Filtering 108
- CHAPTER 13 109
- STP Terminology 110
- How STP Works 110
- STP Port States 111
- Multiple RSTP 111
- Multiple STP 112
- 13.10 Technical Reference 125
- 13.10.1 MSTP Network Example 126
- 13.10.2 MST Region 126
- 13.10.3 MST Instance 127
- CHAPTER 14 129
- 14.2 Bandwidth Control Setup 130
- Chapter 14 Bandwidth Control 131
- CHAPTER 15 132
- CHAPTER 16 134
- 16.2 Port Mirroring Setup 135
- Chapter 16 Mirroring 136
- CHAPTER 17 137
- 17.2 Link Aggregation Status 138
- Chapter 17 Link Aggregation 139
- Aggregation 142
- Control 142
- Protocol 142
- 17.5 Technical Reference 143
- CHAPTER 18 145
- 18.3.1 Guest VLAN 148
- Internet 148
- CHAPTER 19 151
- 19.2 Port Security Setup 152
- Chapter 19 Port Security 153
- CHAPTER 20 154
- 20.3 Classifier Example 158
- Chapter 20 Classifier 159
- CHAPTER 21 160
- 21.3 Policy Example 164
- CHAPTER 22 165
- 22.2 Configuring Queuing 166
- CHAPTER 23 168
- IGMP Snooping and VLANs 169
- MVR Overview 169
- Types of MVR Ports 169
- 23.2 Multicast Status 170
- 23.3 Multicast Setting 171
- Chapter 23 Multicast 173
- 23.4 IGMP Snooping VLAN 174
- 23.5 IGMP Filtering Profile 175
- 23.6 The MVR Screen 176
- Chapter 23 Multicast 180
- CHAPTER 24 182
- 24.2 AAA Screens 183
- 24.3 RADIUS Server Setup 183
- Chapter 24 AAA 185
- 24.5 AAA Setup 188
- 24.6 Technical Reference 190
- Table 65 Supported VSAs 191
- CHAPTER 25 193
- 25.2 IP Source Guard 194
- 25.4 DHCP Snooping 196
- Chapter 25 IP Source Guard 198
- Chapter 25 IP Source Guard 201
- 25.6 ARP Inspection Status 204
- 25.10 Technical Reference 211
- 25.10.2.3 Syslog 214
- CHAPTER 26 215
- 26.2 Loop Guard Setup 217
- CHAPTER 27 219
- CHAPTER 28 223
- 28.1.2.2 Sub-Option Format 224
- 28.2 The PPPoE Screen 225
- 28.3.1 PPPoE IA Per-Port 227
- 28.3.3 PPPoE IA for VLAN 230
- CHAPTER 29 231
- Detect screen 232
- Chapter 29 Error Disable 235
- Chapter 29 Error Disable 236
- CHAPTER 30 237
- Chapter 30 Static Route 239
- CHAPTER 31 240
- 31.2 Activating DiffServ 241
- CHAPTER 32 244
- 32.2 DHCP Status 245
- 192.168.1.100 249
- 172.23.10.100 249
- CHAPTER 33 250
- Gratuitous-ARP 251
- ARP-Request 251
- Chapter 33 ARP Learning 254
- CHAPTER 34 255
- 34.2.1 Load Factory Default 256
- 34.2.2 Save Configuration 256
- 34.3 Firmware Upgrade 257
- 34.6 Technical Reference 259
- 34.6.4 GUI-based FTP Clients 260
- 34.6.5 FTP Restrictions 260
- CHAPTER 35 261
- 35.3 Configuring SNMP 262
- 35.7 Technical Reference 270
- SNMP v3 and Security 271
- Supported MIBs 271
- SNMP Traps 271
- Chapter 35 Access Control 272
- Chapter 35 Access Control 273
- 35.7.2 SSH Overview 277
- 35.7.3 Introduction to HTTPS 278
- 35.7.3.1 HTTPS Example 279
- 35.7.3.2 The Main Screen 283
- CHAPTER 36 285
- Chapter 36 Diagnostic 286
- CHAPTER 37 287
- 37.3 Syslog Server Setup 289
- CHAPTER 38 290
- 38.1.1 What You Can Do 291
- 38.4 Technical Reference 294
- CHAPTER 39 296
- Chapter 39 MAC Table 298
- CHAPTER 40 299
- CHAPTER 41 301
- Chapter 41 Configure Clone 302
- CHAPTER 42 303
- 42.2 Switch Access and Login 304
- 42.3 Switch Configuration 306
- CHAPTER 43 307
- FEATURE DESCRIPTION 309
- STANDARD DESCRIPTION 313
- APPENDIX A 315
- Appendix A Changing a Fuse 316
- APPENDIX B 317
- Appendix B Common Services 318
- Appendix B Common Services 319
- PPENDIX C 321
- ZyXEL Limited Warranty 322
- GS2200-8/24 User’s Guide 331 331
- GS2200-8/24 User’s Guide332 332
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