Home » TP-Link Manuals » Hubs & Switches » TP-Link TL-SG3216 » Manual Viewer

TP-Link TL-SG3216 TL-SG3216 V1 User Guide - Page 149

DHCP-DISCOVER Stage, DHCP-OFFER Stage, DHCP-REQUEST Stage, DHCP-ACK Stage, Option 82

Add to My Manuals
Save this manual to your list of manuals

Page 149 highlights

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. （2） DHCP-OFFER Stage: Upon receiving the DHCP-DISCOVER packet, the DHCP Server selects an IP address from the IP pool according to the assigning priority of the IP addresses and replies to the Client with DHCP-OFFER packet carrying the IP address and other information. （3） DHCP-REQUEST Stage: In the situation that there are several DHCP Servers sending the DHCP-DFFER packets, the Client will only respond to the first received DHCP-DFFER packet and broadcast the DHCP-REQUEST packet which includes the assigned IP address of the DHCP-OFFER packet. （4） DHCP-ACK Stage: Since the DHCP-REQUEST packet is broadcasted, all DHCP Servers on the network segment can receive it. However, only the requested Server processes the request. If the DHCP Server acknowledges assigning this IP address to the Client, it will send the DHCP-ACK packet back to the Client. Otherwise, the Server will send the DHCP-NAK packet to refuse assigning this IP address to the Client. ¾ Option 82 The DHCP packets are classified into 8 types with the same format based on the format of BOOTP packet. The difference between DHCP packet and BOOTP packet is the Option field. The Option field of the DHCP packet is used to expand the function, for example, the DHCP can transmit the control information and network parameters via the Option field, so as to assign the IP address to the Client dynamically. For the details of the DHCP Option, please refer to RFC 2132. Option 82 records the location of the DHCP Client. Upon receiving the DHCP-REQUEST packet, the switch adds the Option 82 to the packet and then transmits the packet to DHCP Server. Administrator can be acquainted with the location of the DHCP Client via Option 82 so as to locate the DHCP Client for fulfilling the security control and account management of Client. The Server supported Option 82 also can set the distribution policy of IP addresses and the other parameters according to the Option 82, providing more flexible address distribution way. 142

Section	Page
Package Contents	8
Chapter 1 About this Guide	9
1.1 Intended Readers	9
1.2 Conventions	9
1.3 Overview of This Guide	9
Chapter 2 Introduction	13
2.1 Overview of the Switch	13
2.2 Main Features	13
2.3 Appearance Description	14
2.3.1 Front Panel	14
2.3.2 Rear Panel	15
Chapter 3 Login to the Switch	16
3.1 Login	16
3.2 Configuration	16
Chapter 4 System	18
4.1 System Info	18
4.1.1 System Summary	18
4.1.2 Device Description	20
4.1.3 System Time	20
4.1.4 System IP	22
4.2 User Manage	23
4.2.1 User Table	23
4.2.2 User Config	23
4.3 System Tools	25
4.3.1 Config Restore	25
4.3.2 Config Backup	25
4.3.3 Firmware Upgrade	26
4.3.4 System Reboot	27
4.3.5 System Reset	27
4.4 Access Security	27
4.4.1 Access Control	27
4.4.2 SSL Config	29
4.4.3 SSH Config	30
Chapter 5 Switching	36
5.1 Port	36
5.1.1 Port Config	36
5.1.2 Port Mirror	37
5.1.3 Port Security	39
5.2 LAG	40
5.2.1 LAG Table	41
5.2.2 Static LAG	42
5.2.3 LACP Config	43
5.3 Traffic Monitor	45
5.3.1 Traffic Summary	45
5.3.2 Traffic Statistics	46
5.4 MAC Address	47
5.4.1 Address Table	48
5.4.2 Static Address	50
5.4.3 Dynamic Address	51
5.4.4 Filtering Address	53
Chapter 6 VLAN	55
6.1 802.1Q VLAN	56
6.1.1 VLAN Config	58
6.1.2 Port Config	60
6.2 MAC VLAN	62
6.3 Protocol VLAN	63
6.3.1 Protocol Group Table	66
6.3.2 Protocol Group	66
6.3.3 Protocol Template	67
6.4 Application Example for 802.1Q VLAN	68
6.5 Application Example for MAC VLAN	70
6.6 Application Example for Protocol VLAN	71
6.7 GVRP	73
Chapter 7 Spanning Tree	77
7.1 STP Config	82
7.1.1 STP Config	82
7.1.2 STP Summary	84
7.2 Port Config	84
7.3 MSTP Instance	86
7.3.1 Region Config	86
7.3.2 Instance Config	87
7.3.3 Instance Port Config	88
7.4 STP Security	90
7.4.1 Port Protect	90
7.4.2 TC Protect	93
7.5 Application Example for STP Function	93
Chapter 8 Multicast	97
8.1 IGMP Snooping	99
8.1.1 Snooping Config	100
8.1.2 Port Config	101
8.1.3 VLAN Config	102
8.1.4 Multicast VLAN	104
8.2 Multicast IP	107
8.2.1 Multicast IP Table	108
8.2.2 Static Multicast IP	108
8.3 Multicast Filter	109
8.3.1 IP-Range	110
8.3.2 Port Filter	111
8.4 Packet Statistics	112
Chapter 9 QoS	114
9.1 DiffServ	117
9.1.1 Port Priority	117
9.1.2 Schedule Mode	118
9.1.3 802.1P Priority	119
9.1.4 DSCP Priority	119
9.2 Bandwidth Control	121
9.2.1 Rate Limit	121
9.2.2 Storm Control	122
9.3 Voice VLAN	123
9.3.1 Global Config	125
9.3.2 Port Config	126
9.3.3 OUI Config	127
Chapter 10 ACL	129
10.1 Time-Range	129
10.1.1 Time-Range Summary	129
10.1.2 Time-Range Create	130
10.1.3 Holiday Config	131
10.2 ACL Config	131
10.2.1 ACL Summary	132
10.2.2 ACL Create	132
10.2.3 MAC ACL	133
10.2.4 Standard-IP ACL	134
10.2.5 Extend-IP ACL	134
10.3 Policy Config	136
10.3.1 Policy Summary	136
10.3.2 Policy Create	137
10.3.3 Action Create	137
10.4 Policy Binding	138
10.4.1 Binding Table	138
10.4.2 Port Binding	139
10.4.3 VLAN Binding	139
10.5 Application Example for ACL	140
Chapter 11 Network Security	143
11.1 IP-MAC Binding	143
11.1.1 Binding Table	143
11.1.2 Manual Binding	144
11.1.3 ARP Scanning	146
11.1.4 DHCP Snooping	147
11.2 ARP Inspection	153
11.2.1 ARP Detect	157
11.2.2 ARP Defend	158
11.2.3 ARP Statistics	159
11.3 DoS Defend	160
11.4 802.1X	162
11.4.1 Global Config	166
11.4.2 Port Config	168
11.4.3 Radius Server	169
Chapter 12 SNMP	171
12.1 SNMP Config	173
12.1.1 Global Config	173
12.1.2 SNMP View	174
12.1.3 SNMP Group	175
12.1.4 SNMP User	176
12.1.5 SNMP Community	178
12.2 Notification	180
12.3 RMON	182
12.3.1 History Control	183
12.3.2 Event Config	183
12.3.3 Alarm Config	184
Chapter 13 Cluster	187
13.1 NDP	188
13.1.1 Neighbor Info	188
13.1.2 NDP Summary	189
13.1.3 NDP Config	191
13.2 NTDP	192
13.2.1 Device Table	192
13.2.2 NTDP Summary	193
13.2.3 NTDP Config	194
13.3 Cluster	196
13.3.1 Cluster Summary	196
13.3.2 Cluster Config	197
13.4 Application Example for Cluster Function	199
Chapter 14 Maintenance	202
14.1 System Monitor	202
14.1.1 CPU Monitor	202
14.1.2 Memory Monitor	203
14.2 Log	204
14.2.1 Log Table	205
14.2.2 Local Log	205
14.2.3 Remote Log	206
14.2.4 Backup Log	207
14.3 Device Diagnose	208
14.3.1 Cable Test	208
14.3.2 Loopback	209
14.4 Network Diagnose	209
14.4.1 Ping	209
14.4.2 Tracert	210
Appendix A: Specifications	212
Appendix B: Configuring the PCs	213
Appendix C: Load Software using FTP	216
Appendix D: 802.1X Client Software	221

Match case Limit results 1 per page

Figure 11-6 Interaction between a DHCP client and a DHCP server

（

）

DHCP-DISCOVER Stage:

The Client broadcasts the DHCP-DISCOVER packet to find the

DHCP Server.

（

）

DHCP-OFFER Stage:

Upon receiving the DHCP-DISCOVER packet, the DHCP Server

selects an IP address from the IP pool according to the assigning priority of the IP

addresses and replies to the Client with DHCP-OFFER packet carrying the IP address and

other information.

（

）

DHCP-REQUEST Stage:

In the situation that there are several DHCP Servers sending the

DHCP-DFFER packets, the Client will only respond to the first received DHCP-DFFER

packet and broadcast the DHCP-REQUEST packet which includes the assigned IP

address of the DHCP-OFFER packet.

（

）

DHCP-ACK Stage:

Since the DHCP-REQUEST packet is broadcasted, all DHCP Servers

on the network segment can receive it. However, only the requested Server processes the

request. If the DHCP Server acknowledges assigning this IP address to the Client, it will

send the DHCP-ACK packet back to the Client. Otherwise, the Server will send the

DHCP-NAK packet to refuse assigning this IP address to the Client.

Option 82

The DHCP packets are classified into 8 types with the same format based on the format of BOOTP

packet. The difference between DHCP packet and BOOTP packet is the Option field. The Option

field of the DHCP packet is used to expand the function, for example, the DHCP can transmit the

control information and network parameters via the Option field, so as to assign the IP address to

the Client dynamically. For the details of the DHCP Option, please refer to RFC 2132.

Option 82 records the location of the DHCP Client. Upon receiving the DHCP-REQUEST packet,

the switch adds the Option 82 to the packet and then transmits the packet to DHCP Server.

Administrator can be acquainted with the location of the DHCP Client via Option 82 so as to locate

the DHCP Client for fulfilling the security control and account management of Client. The Server

supported Option 82 also can set the distribution policy of IP addresses and the other parameters

according to the Option 82, providing more flexible address distribution way.

142