Planet GS-4210-8P2S User Manual Page 247
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User’s Manual of GS-4210 Series
4.9.7.6 Database Agent
Overview of the DHCP Snooping Database Agent
When DHCP snooping is enabled, the switch uses the DHCP snooping binding database to store information about untrusted
interfaces. The database can have up to 8192 bindings.
Each database entry (binding) has an IP address, an associated MAC address, the lease time (in hexadecimal format), the
interface to which the binding applies, and the VLAN to which the interface belongs. A checksum value, the end of each entry, is
the number of bytes from the start of the file to end of the entry. Each entry is 72 bytes, followed by a space and then the
checksum value.
To keep the bindings when the switch reloads, you must use the DHCP snooping database agent. If the agent is disabled,
dynamic ARP or IP source guard is enabled, and the DHCP snooping binding database has dynamic bindings, the switch loses
its connectivity. If the agent is disabled and only DHCP snooping is enabled, the switch does not lose its connectivity, but DHCP
snooping might not prevent DCHP spoofing attacks.
The database agent stores the bindings in a file at a configured location. When reloading, the switch reads the binding file to
build the DHCP snooping binding database. The switch keeps the file current by updating it when the database changes.
When a switch learns of new bindings or when it loses bindings, the switch immediately updates the entries in the database.
The switch also updates the entries in the binding file. The frequency at which the file is updated is based on a configurable
delay, and the updates are batched. If the file is not updated in a specified time (set by the write-delay and abort-timeout values),
the update stops.
The DHCP Snooping Database and Information screens in Figure 4-9-40 & Figure 4-9-41 appear.
Figure 4-9-40 DHCP Snooping Database Setting Page Screenshot
The page includes the following fields:
Object Description
Database Type
Select database type
File Name
The name of file image
247
- TABLE OF CONTENTS 3
- 1. INTRODUCTION 10
- 1.2 Product Description 11
- 1.3 How to Use This Manual 14
- 1.4 Product Features 15
- 1.5 Product Specifications 18
- GS-4210-48T4S 24
- 2. INSTALLATION 27
- 2.1.2 LED Indications 29
- 2.1.3 Switch Rear Panel 33
- Power Notice: 34
- 2.2 Installing the Switch 35
- 2.2.2 Rack Mounting 36
- Connect the Fiber Cable 39
- 3. SWITCH MANAGEMENT 41
- 3.3 Administration Console 43
- 3.4 Web Management 44
- 4. WEB CONFIGURATION 48
- 4.1 Main Web Page 51
- 4.1.1 Save Button 52
- 4.1.2 Configuration Manager 53
- 4.1.2.1 Saving Configuration 54
- 4.2 System 55
- 4.2.2 IP Configurations 56
- 4.2.3 IPv6 Configuration 58
- 4.2.4 User Configuration 60
- 4.2.5 Time Settings 61
- 4.2.5.2 SNTP Server Settings 64
- 4.2.6 Log Management 65
- 4.2.6.2 Local Log 66
- 4.2.6.3 Remote Syslog 67
- 4.2.6.4 Log Message 69
- 4.2.7 SNMP Management 71
- 4.2.7.3 SNMP View 72
- 4.2.7.4 SNMP Access Group 74
- 4.2.7.5 SNMP Community 76
- 4.2.7.6 SNMP User 77
- 4.2.7.9 SNMP Engine ID 81
- 4.3 Port Management 84
- 4.3.2 Port Counters 86
- 4.3.3 Bandwidth Utilization 91
- 4.3.4 Port Mirroring 92
- 4.3.5 Jumbo Frame 94
- 4.3.7 Port Error Disabled 97
- 4.3.8 Protected Ports 97
- 4.3.9 EEE 100
- 4.3.10.1 SFP Module Status 101
- 4.4 Link Aggregation 104
- 4.4.1 LAG Setting 106
- 4.4.2 LAG Management 107
- 4.4.3 LAG Port Setting 108
- 4.4.4 LACP Setting 110
- 4.4.5 LACP Port Setting 111
- 4.4.6 LAG Status 112
- 4.5 VLAN 115
- 4.5.2 IEEE 802.1Q VLAN 116
- Priority CFI VLAN ID 118
- 4.5.3 Management VLAN 120
- 4.5.4 Create VLAN 121
- 4.5.5 Interface Settings 122
- 4.5.6 Port to VLAN 126
- 4.5.7 Port VLAN Membership 127
- 4.5.10 GVRP Setting 131
- 4.5.11 GVRP Port Setting 133
- 4.5.12 GVRP VLAN 134
- 4.5.13 GVRP Statistics 135
- 4.5.14 VLAN setting example: 137
- 4.6 Spanning Tree Protocol 143
- 4.6.2 STP Global Settings 150
- 4.6.3 STP Port Setting 152
- 4.6.4 CIST Instance Setting 155
- 4.6.5 CIST Port Setting 157
- 4.6.7 MST Port Setting 161
- 4.6.8 STP Statistics 163
- 4.7 Multicast 164
- 4.7.2 IGMP Snooping 165
- Type Response Time 167
- 4.7.2.1 IGMP Setting 169
- 4.7.2.2 IGMP Querier Setting 171
- 4.7.2.3 IGMP Static Group 172
- 4.7.2.4 IGMP Group Table 173
- 4.7.2.5 IGMP Router Setting 174
- 4.7.2.6 IGMP Router Table 175
- 4.7.2.7 IGMP Forward All 176
- 4.7.3 IGMP Snooping Statics 177
- 4.7.4 MLD Snooping 179
- 4.7.4.2 MLD Static Group 181
- 4.7.4.3 MLD Group Table 182
- 4.7.4.4 MLD Router Setting 182
- 4.7.4.5 MLD Router Table 184
- 4.7.4.6 MLD Forward All 185
- 4.7.5 MLD Snooping Statics 186
- 4.7.7 Multicast Filter 189
- 4.7.7.2 IGMP Filter Setting 191
- 4.7.7.3 MLD Filter Setting 192
- 4.8 Quality of Service 194
- 4.8.2 General 195
- 4.8.2.2 QoS Port Settings 196
- 4.8.2.3 Queue Settings 197
- 4.8.2.4 CoS Mapping 198
- CoS Mapping 199
- 4.8.2.5 DSCP Mapping 200
- 4.8.3 QoS Basic Mode 203
- 4.8.3.2 Port Settings 204
- 4.8.4 Rate Limit 205
- 4.8.4.3 Egress Queue 207
- 4.8.5 Voice VLAN 208
- 4.8.5.2 Properties 209
- 4.9 Security 214
- 4.9.1.2 802.1X Setting 218
- 4.9.1.3 802.1X Port Setting 219
- 4.9.1.4 Guest VLAN Setting 221
- 4.9.1.5 Authenticated Host 223
- 4.9.2 RADIUS Server 224
- 4.9.3 TACACS+ Server 227
- 4.9.4 AAA 229
- 4.9.4.1 Login List 230
- 4.9.4.2 Enable List 231
- 4.9.5 Access 232
- 4.9.5.2 SSH 233
- 4.9.5.3 HTTP 235
- 4.9.5.4 HTTPs 236
- 4.9.6.1 Profile Rules 237
- 4.9.6.2 Access Rules 239
- 4.9.7 DHCP Snooping 240
- 4.9.7.2 Global Setting 241
- 4.9.7.4 Port Setting 244
- 4.9.7.5 Statistics 246
- 4.9.7.6 Database Agent 247
- 4.9.7.7 Rate Limit 249
- 4.9.8 Dynamic ARP Inspection 254
- 4.9.8.2 VLAN Setting 255
- 4.9.8.3 Port Setting 256
- 4.9.8.4 Statistics 258
- 4.9.8.5 Rate Limit 259
- 4.9.9 IP Source Guard 260
- 4.9.9.1 Port Settings 261
- 4.9.9.2 Binding Table 263
- 4.9.10 Port Security 264
- 4.9.11 DoS 266
- 4.9.11.2 DoS Port Setting 269
- 4.9.12 Storm Control 270
- 4.9.12.2 Port Setting 271
- 4.10 ACL 273
- 4.10.1 MAC-based ACL 274
- 4.10.2 MAC-based ACE 275
- 4.10.3 IPv4-based ACL 278
- 4.10.4 IPv4-based ACE 279
- 4.10.5 IPv6-based ACL 284
- 4.10.6 IPv6-based ACE 285
- 4.10.7 ACL Binding 290
- 4.11 MAC Address Table 291
- 4.11.1 Static MAC Setting 292
- 4.11.2 MAC Filtering 293
- 4.11.4 Dynamic Learned 295
- 4.12 LLDP 297
- 4.12.2 LLDP Global Setting 298
- 4.12.3 LLDP Port Setting 300
- 4.12.4 LLDP Local Device 303
- 4.12.5 LLDP Remove Device 305
- 4.12.6 MED Network Policy 306
- 4.12.7 MED Port Setting 310
- 4.12.8 LLDP Overloading 313
- 4.12.9 LLDP Statistics 314
- 4.13 Diagnostics 316
- 4.13.2 Ping 318
- 4.13.3 Ping Test 318
- 4.13.4 IPv6 Ping Test 319
- 4.13.5 Trace Router 320
- 4.14 RMON 321
- 4.14.2 RMON Event 323
- 4.14.3 RMON Event Log 324
- 4.14.4 RMON Alarm 325
- 4.14.5 RMON History 328
- 4.14.6 RMON History Log 329
- 4.15 Power over Ethernet 330
- 4.15.2 System Configuration 332
- 4.15.4 PoE Schedule 336
- 4.16 Maintenance 341
- 4.16.3 Backup Manager 342
- 4.16.4 Upgrade Manager 342
- 4.16.5 Dual Image 344
- 5. SWITCH OPERATION 346
- 5.5 Auto-Negotiation 347
- 6. TROUBLESHOOTING 348
- A.1 1000Mbps, 1000BASE-T 350
- 12345678 351
- EC Declaration of Conformity 352
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