Planet GS-4210-8P2S User Manual Page 240
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User’s Manual of GS-4210 Series
4.9.7 DHCP Snooping
4.9.7.1 DHCP Snooping Overview
The addresses assigned to DHCP clients on unsecure ports can be carefully controlled using the dynamic bindings registered
with DHCP Snooping. DHCP snooping allows a switch to protect a network from rogue DHCP servers or other devices which
send port-related information to a DHCP server. This information can be useful in tracking an IP address back to a physical port.
Command Usage
Network traffic may be disrupted when malicious DHCP messages are received from an outside source. DHCP snooping is
used to filter DHCP messages received on a non-secure interface from outside the network or firewall. When DHCP
snooping is enabled globally and enabled on a VLAN interface, DHCP messages received on an untrusted interface from
a device not listed in the DHCP snooping table will be dropped.
Table entries are only learned for trusted interfaces. An entry is added or removed dynamically to the DHCP snooping table
when a client receives or releases an IP address from a DHCP server. Each entry includes a MAC address, IP address, lease
time, VLAN identifier, and port identifier.
When DHCP snooping is enabled, DHCP messages entering an untrusted interface are filtered based upon dynamic entries
learned via DHCP snooping.
Filtering rules are implemented as follows:
240
- 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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