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- Table of contents
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DHCP Working Principle
DHCP works via the “Client/Server” communication mode. The Client applies to the Server for
configuration. The Server assigns the configuration information, such as the IP address, to the
Client, so as to reach a dynamic employ of the network source. A Server can assign the IP
address for several Clients, which is illustrated in the following figure.
Figure 11-5 Network diagram for DHCP-snooping implementation
For different DHCP Clients, DHCP Server provides three IP address assigning methods:
（1） Manually assign the IP address: Allows the administrator to bind the static IP address to
the specific Client (e.g.: WWW Server) via the DHCP Server.
（2） Automatically assign the IP address: DHCP Server assigns the IP address without an
expiration time limitation to the Clients.
（3） Dynamically assign the IP address: DHCP Server assigns the IP address with an
expiration time. When the time for the IP address expired, the Client should apply for a
new one.
The most Clients obtain the IP addresses dynamically, which is illustrated in the following figure.
Figure 11-6 Interaction between a DHCP client and a DHCP server
（1） DHCP-DISCOVER Stage: The Client broadcasts the DHCP-DISCOVER packet to find the
DHCP Server.
150
- TL-SG5428 1
- TL-SG5412F 1
- COPYRIGHT & TRADEMARKS 2
- FCC STATEMENT 2
- CE Mark Warning 2
- Safety Information 3
- Package Contents 10
- Chapter 1 About this Guide 11
- Chapter 2 Introduction 15
- 2.3 Appearance Description 16
- 2.3.2 Rear Panel 17
- 3.1 Login 19
- 3.2 Configuration 19
- Figure 3-3 Main Setup-Menu 20
- Chapter 4 System 21
- 4.1.2 Device Description 22
- 4.1.3 System Time 23
- 4.1.4 Daylight Saving Time 24
- 4.1.5 System IP 25
- Figure 4-7 System IP 26
- 4.2 User Management 27
- 4.3 System Tools 28
- 4.3.2 Config Backup 29
- 4.3.3 Firmware Upgrade 30
- 4.3.4 System Reboot 30
- 4.4 Access Security 31
- 4.4.2 SSL Config 33
- 4.4.3 SSH Config 34
- Figure 4-17 SSH Config 35
- Network Requirements 36
- Return to CONTENTS 39
- Chapter 5 Switching 40
- 5.1.2 Port Mirror 41
- Mirror Group List 42
- Mirror Group 42
- Mirroring Port 42
- 5.1.3 Port Security 43
- Figure 5-4 Port Security 44
- 5.1.4 Port Isolation 45
- 5.1.5 Loopback Detection 46
- 5.2 LAG 47
- 5.2.1 LAG Table 48
- 5.2.2 Static LAG 49
- 5.2.3 LACP Config 50
- Figure 5-10 LACP Config 51
- 5.3 Traffic Monitor 52
- 5.3.2 Traffic Statistics 53
- 5.4 MAC Address 54
- 5.4.1 Address Table 55
- 5.4.2 Static Address 56
- Figure 5-14 Static Address 57
- 5.4.3 Dynamic Address 58
- 5.4.4 Filtering Address 59
- Create Filtering Address 60
- Search Option 60
- Filtering Address Table 60
- Chapter 6 VLAN 62
- 6.1 802.1Q VLAN 63
- 6.1.1 VLAN Config 64
- VLAN Table 65
- 6.1.2 Port Config 66
- VLAN Port Config 67
- VLAN of Port 67
- 6.2 Protocol VLAN 68
- 6.2.1 Protocol VLAN 69
- 6.2.2 Protocol Template 69
- 6.2.3 Port Enable 70
- 6.3 VLAN VPN 71
- 6.3.1 VPN Config 72
- 6.4 GVRP 73
- GVRP 74
- Figure 6-12 GVRP Config 75
- 6.5 Private VLAN 77
- Figure 6-13 79
- Figure 6-16, supposing the 79
- 6.5.1 PVLAN Config 81
- 6.5.2 Port Config 82
- Network Diagram 85
- Configure Switch A 85
- Configure Switch B 85
- Configure Switch C 87
- Chapter 7 Spanning Tree 88
- Figure 7-1 Basic STP diagram 89
- Table 7-1 Comparing BPDUs 90
- 7.1 STP Config 92
- Figure 7-4 STP Config 93
- 7.1.2 STP Summary 94
- 7.2 Port Config 95
- 7.3 MSTP Instance 97
- Figure 7-8 Instance Config 98
- 7.3.3 Instance Port Config 99
- 7.4 STP Security 100
- Loop Protect 101
- Root Protect 101
- TC Protect 101
- BPDU Protect 101
- BPDU Filter 101
- Figure 7-10 Port Protect 102
- 7.4.2 TC Protect 103
- Configuration Procedure 104
- Configure Switch A: 104
- Configure Switch B: 104
- Configure Switch C: 105
- Configure Switch D: 105
- Chapter 8 Multicast 107
- Figure 8-3 below 108
- 8.1 IGMP Snooping 109
- 8.1.1 Snooping Config 110
- 8.1.2 Port Config 111
- 8.1.3 VLAN Config 112
- Figure 8-6 VLAN Config 113
- 8.1.4 Multicast VLAN 114
- Figure 8-7 Multicast VLAN 115
- Configuration procedure: 116
- 8.3 Multicast IP 117
- 8.3.2 Static Multicast IP 118
- 8.4 Multicast Filter 119
- 8.4.1 IP-Range 120
- 8.4.2 Port Filter 120
- Figure 8-11 Port Filter 121
- 8.5 Packet Statistics 122
- Chapter 9 QoS 124
- Figure 9-2 802.1Q frame 125
- Figure 9-3 IP datagram 125
- Figure 9-4 SP-Mode 126
- Figure 9-5 WRR-Mode 126
- 9.1 DiffServ 127
- 9.1.2 Schedule Mode 128
- 9.1.3 802.1P/CoS Mapping 129
- 9.1.4 DSCP Priority 130
- 9.2 Bandwidth Control 131
- 9.2.2 Storm Control 132
- 9.3 Voice VLAN 133
- Port Voice VLAN Mode 134
- 9.3.1 Global Config 136
- 9.3.2 Port Config 136
- Figure 9-13 Port Config 137
- 9.3.3 OUI Config 138
- Chapter 10 ACL 140
- 10.1.2 Time-Range Create 141
- 10.2 ACL Config 142
- 10.2.2 ACL Create 143
- 10.2.3 MAC ACL 143
- 10.2.4 Standard-IP ACL 144
- 10.2.5 Extend-IP ACL 145
- Permit: Forward packets 146
- Deny: Discard Packets 146
- 10.3 Policy Config 147
- 10.3.3 Action Create 148
- 10.4 Policy Binding 149
- 10.4.3 VLAN Binding 150
- Configuration Procedure: 151
- Chapter 11 Network Security 154
- 11.1.2 Manual Binding 155
- Figure 11-2 Manual Binding 156
- 11.1.3 ARP Scanning 157
- 11.1.4 DHCP Snooping 158
- DHCP Working Principle 159
- Option 82 160
- DHCP Cheating Attack 160
- Figure 11-8 DHCP Snooping 162
- 11.2 ARP Inspection 163
- Imitating Gateway 164
- Cheating Gateway 164
- Cheating Terminal Hosts 165
- Man-In-The-Middle Attack 166
- 11.2.1 ARP Detect 167
- 11.2.2 ARP Defend 168
- 11.2.3 ARP Statistics 169
- 11.3 IP Source Guard 170
- 11.4 DoS Defend 171
- 11.5 802.1X 173
- 802.1X Timer 176
- 11.5.1 Global Config 177
- Global Config 178
- Authentication Config 178
- 11.5.2 Port Config 179
- 11.5.3 Radius Server 180
- Chapter 12 SNMP 182
- MIB Introduction 183
- 12.1 SNMP Config 184
- 12.1.2 SNMP View 185
- 12.1.3 SNMP Group 185
- Figure 12-5 SNMP Group 186
- 12.1.4 SNMP User 187
- User Table 188
- 12.1.5 SNMP Community 189
- 12.2 Notification 191
- 12.3 RMON 192
- 12.3.1 History Control 193
- 12.3.2 Event Config 194
- 12.3.3 Alarm Config 194
- Figure 12-11 Alarm Config 195
- Chapter 13 LLDP 197
- 13.1 Basic Config 200
- 13.1.2 Port Config 201
- 13.2 Device Info 202
- 13.2.2 Neighbor Info 203
- 13.3 Device Statistic 204
- Auto Refresh 205
- Global Statistics 205
- Neighbor Statistics 205
- Chapter 14 Cluster 207
- 14.1 NDP 208
- 14.1.2 NDP Summary 209
- 14.1.3 NDP Config 210
- Figure 14-4 NDP Config 211
- 14.2 NTDP 212
- 14.2.2 NTDP Summary 213
- 14.2.3 NTDP Config 214
- Figure 14-8 NTDP Config 215
- 14.3 Cluster 216
- Cluster Config 217
- Member Info 217
- 14.3.2 Cluster Config 218
- 14.3.3 Member Config 221
- 14.3.4 Cluster Topology 222
- Figure 14-19 Network diagram 224
- Chapter 15 Maintenance 226
- 15.2 Log 227
- 15.2.1 Log Table 228
- 15.2.2 Local Log 228
- 15.2.3 Remote Log 229
- 15.3 Device Diagnostics 230
- 15.3.1 Cable Test 231
- 15.3.2 Loopback 231
- 15.4 Network Diagnostics 232
- 15.4.2 Tracert 233
- Figure 15-10 Tracert 234
- 1. Hardware Installation 235
- Figure 16-5 Port Settings 237
- Figure 16-6 bootUtil Menu 237
- Appendix A: Specifications 239
- Figure B-1 240
- Figure B-2 240
- Figure B-3 241
- 1.1 Installation Guide 242
- Figure C-6 Setup Status 244
- 1.2 Uninstall Software 245
- 1.3 Configuration 246
- Appendix D: Glossary 250
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