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User’s Manual of GSD-1002M
Displa
y the current forwarded
Forwarded
Chaddr Check Dropped
Display the chaddr check dropped
Displa
y untrust port dropped
Untrust Port Dropped
Displa
y untrust port with option82 dropped
Untrust Port with
Option82 Dropped
Displa
y invalid dropped
Invaild Dropped
Buttons
: Click to clear the statistics.
: Click to refresh the statistics.
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.
224
- User’s Manual of GSD-1002M 1
- TABLE OF CONTENTS 3
- 1. INTRODUCTION 10
- 1.2 Product Description 11
- 1.3 How to Use This Manual 13
- 1.4 Product Features 13
- 1.5 Product Specifications 16
- 2. INSTALLATION 19
- 2.1.2 LED Indications 20
- 2.1.3 Switch Rear Panel 21
- 2.2 Installing the Switch 22
- 3. SWITCH MANAGEMENT 26
- 3.3 Web Management 27
- 3.4 Remote Telnet 28
- 4. WEB CONFIGURATION 30
- 4.1 Main Web Page 33
- 4.1.1 Save Button 34
- 4.1.2 Configuration Manager 35
- 4.1.2.1 Saving Configuration 36
- 4.2 System 37
- 4.2.2 IP Configurations 38
- 4.2.3 IPv6 Configuration 40
- 4.2.4 User Configuration 42
- 4.2.5 Time Settings 43
- 4.2.5.2 SNTP Server Settings 45
- 4.2.6 Log Management 46
- 4.2.6.1 Local Log 47
- 4.2.6.2 Local Log 48
- 4.2.6.3 Remote Syslog 49
- 4.2.6.4 Log Message 51
- 4.2.7 SNMP Management 53
- 4.2.7.3 SNMP View 54
- 4.2.7.4 SNMP Access Group 56
- 4.2.7.5 SNMP Community 58
- 4.2.7.6 SNMP User 59
- 4.2.7.9 SNMP Engine ID 64
- 4.3 Port Management 67
- 4.3.2 Port Counters 69
- 4.3.3 Bandwidth Utilization 74
- 4.3.4 Port Mirroring 75
- 4.3.5 Jumbo Frame 77
- 4.3.7 Port Error Disabled 80
- 4.3.8 Protected Ports 80
- 4.3.9 EEE 83
- 4.3.10.1 SFP Module Status 84
- 4.4 Link Aggregation 86
- 4.4.1 LAG Setting 87
- 4.4.2 LAG Managment 88
- 4.4.3 LAG Port Setting 90
- 4.4.4 LACP Setting 92
- 4.4.5 LACP Port Setting 92
- 4.4.6 LAG Status 94
- 4.5 VLAN 97
- 4.5.2 IEEE 802.1Q VLAN 98
- ■ 802.1Q VLAN Tags 99
- Priority CFI VLAN ID 100
- 4.5.3 Management VLAN 101
- 4.5.4 Create VLAN 102
- 4.5.5 Interface Settings 103
- 4.5.6 Port to VLAN 107
- 4.5.7 Port VLAN Membership 108
- 4.5.10 GVRP Setting 111
- 4.5.11 GVRP Port Setting 113
- 4.5.12 GVRP VLAN 115
- 4.5.13 GVRP Statistics 115
- 4.5.14 VLAN setting example: 117
- 4.6 Spanning Tree Protocol 123
- 4.6.2 STP Global Settings 129
- 4.6.3 STP Port Setting 131
- 4.6.4 CIST Instance Setting 134
- 4.6.5 CIST Port Setting 136
- 4.6.7 MST Port Setting 140
- 4.6.8 STP Statistics 142
- 4.7 Multicast 143
- 4.7.2 IGMP Snooping 144
- 4.7.2.1 IGMP Setting 148
- 4.7.2.2 IGMP Querier Setting 150
- 4.7.2.3 IGMP Static Group 151
- 4.7.2.4 IGMP Group Table 152
- 4.7.2.5 IGMP Router Setting 153
- 4.7.2.6 IGMP Router Table 154
- 4.7.2.7 IGMP Forward All 155
- 4.7.3 IGMP Snooping Statics 156
- 4.7.4 MLD Snooping 158
- 4.7.4.2 MLD Static Group 160
- 4.7.4.3 MLD Group Table 161
- 4.7.4.4 MLD Router Setting 161
- 4.7.4.5 MLD Router Table 162
- 4.7.5 MLD Snooping Statics 164
- 4.7.7 Multicast Filter 168
- 4.7.7.2 IGMP Filter Setting 170
- 4.7.7.3 MLD Filter Setting 171
- 4.8 Quality of Service 173
- 4.8.2 General 174
- 4.8.2.3 Queue Settings 176
- 4.8.2.4 CoS Mapping 177
- 4.8.2.5 DSCP Mapping 178
- 4.8.3 QoS Basic Mode 181
- 4.8.3.2 Port Settings 182
- 4.8.4 Rate Limit 183
- 4.8.4.3 Egress Queue 186
- 4.8.5 Voice VLAN 187
- 4.9 Security 192
- 4.9.1.2 802.1X Setting 196
- 4.9.1.3 802.1X Port Setting 197
- 4.9.1.4 Guest VLAN Setting 199
- 4.9.1.5 Authenticed Host 201
- 4.9.2 RADIUS Server 202
- 4.9.3 TACACS+ Server 205
- 4.9.4 AAA 207
- 4.9.4.2 Enable List 209
- 4.9.5 Access 210
- 4.9.5.2 SSH 211
- 4.9.5.3 HTTP 213
- 4.9.5.4 HTTPs 214
- 4.9.6.1 Profile Rules 215
- 4.9.6.2 Access Rules 217
- 4.9.7 DHCP Snooping 218
- 4.9.7.2 Global Setting 219
- 4.9.7.3 VLAN Setting 220
- 4.9.7.4 Port Setting 222
- 4.9.7.5 Statistics 223
- 4.9.7.6 Database Agent 224
- 4.9.7.7 Rate Limit 226
- 4.9.8 Dynamic ARP Inspection 231
- 4.9.8.2 VLAN Setting 232
- 4.9.8.3 Port Setting 233
- 4.9.8.4 Statistics 234
- 4.9.8.5 Rate Limit 235
- 4.9.9 IP Source Guard 236
- 4.9.9.1 Port Settings 237
- 4.9.9.2 Binding Table 238
- 4.9.10 Port Security 240
- 4.9.11 DoS 241
- 4.9.11.1 Global DoS Setting 242
- 4.9.11.2 DoS Port Setting 245
- 4.9.12 Storm Control 246
- 4.9.12.2 Port Setting 247
- 4.10 ACL 249
- 4.10.2 MAC-based ACE 250
- 4.10.3 IPv4-based ACL 253
- 4.10.4 IPv4-based ACE 254
- 4.10.6 IPv6-based ACE 260
- 4.10.5 IPv6-based ACL 260
- 4.10.7 ACL Binding 266
- 4.11 MAC Address Table 267
- 4.11.2 MAC Filtering 268
- 4.11.4 Dynamic Learned 270
- 4.12 LLDP 272
- 4.12.3 LLDP Port Setting 274
- 4.12.4 LLDP Local Device 277
- 4.12.5 LLDP Remove Device 279
- 4.12.6 MED Network Policy 280
- 4.12.7 MED Port Setting 283
- 4.12.8 LLDP Overloading 286
- 4.12.9 LLDP Statistics 287
- 4.13 Diagnostics 289
- 4.13.2 Ping 291
- 4.13.3 Ping Test 291
- 4.13.4 IPv6 Ping Test 292
- 4.13.5 Trace Router 293
- 4.14 RMON 295
- 4.14.2 RMON Event 297
- 4.14.3 RMON Event Log 298
- 4.14.4 RMON Alarm 299
- 4.14.5 RMON History 302
- 4.14.6 RMON History Log 303
- 4.15 Maintenance 304
- 4.15.2 Reboot Switch 305
- 4.15.3 Backup Manager 305
- 4.15.4 Upgrade Manager 306
- 5. SWITCH OPERATION 307
- 5.5 Auto-Negotiation 308
- 6. TROUBLESHOOTING 309
- APPENDIX A 311
- EC Declaration of Conformity 313
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