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Configuring DHCP snooping
DHCP snooping works between the DHCP client and server, or between the DHCP client and DHCP
relay agent. It guarantees that DHCP clients obtain IP addresses from authorized DHCP servers. Also, it
records IP-to-MAC bindings of DHCP clients (called DHCP snooping entries) for security purposes.
DHCP snooping does not work between the DHCP server and DHCP relay agent.
Overview
DHCP snooping defines trusted and untrusted ports to make sure clients obtain IP addresses only from
authorized DHCP servers.
• Trusted—A trusted port can forward DHCP messages correctly to make sure the clients get IP
addresses from authorized DHCP servers.
• Untrusted—An untrusted port discards received DHCP-ACK and DHCP-OFFER messages to prevent
unauthorized servers from assigning IP addresses.
DHCP snooping reads DHCP-ACK messages received from trusted ports and DHCP-REQUEST messages
to create DHCP snooping entries. A DHCP snooping entry includes the MAC and IP addresses of a client,
the port that connects to the DHCP client, and the VLAN. The DHCP snooping entries can be used by ARP
detection to prevent ARP attacks. For more information about ARP detection, see "Configuring ARP attack
pr
otection".
Application of trusted ports
Configure ports facing the DHCP server as trusted ports, and configure other ports as untrusted ports.
As shown in Figure 283, co
nfigure the DHCP snooping device's port that is connected to the DHCP
server as a trusted port. The trusted port forwards response messages from the DHCP server to the client.
The untrusted port connected to the unauthorized DHCP server discards incoming DHCP response
messages.
- User Guide 1
- Contents 3
- Overview 14
- Restrictions and guidelines 15
- 3. Click Custom Level 16
- Web interface 20
- Web user level 21
- Web-based NM functions 21
- Buttons and icons 29
- Page display function 29
- Search function 30
- Sort function 32
- Getting started with the CLI 33
- Setting terminal parameters 34
- CLI commands 37
- <Sysname> initialize 38
- [Y/N]:y 38
- Please wait 38
- <Sysname> ipsetup dhcp 38
- <Sysname> password 39
- Examples 41
- Parameters 41
- Description 41
- # Reboot the switch 46
- Configuration wizard 47
- Configuring stack 52
- Configuring stack ports 54
- Stack configuration example 56
- Setting the refresh period 61
- Configuring system name 63
- 4. Click Apply 64
- Maintaining devices 65
- Device reboot 66
- Electronic label 67
- Diagnostic information 67
- Configuring system time 69
- Configuring syslog 74
- Setting the log host 75
- Managing the configuration 77
- Saving the configuration 78
- Resetting the configuration 79
- Managing files 80
- Uploading a file 81
- Removing a file 81
- Managing ports 82
- Configuring port mirroring 92
- 5. Click Apply 98
- Managing users 99
- Setting the super password 100
- Configuring a loopback test 102
- 4. Click Test 103
- Configuring VCT 104
- Configuring RMON 106
- History group 107
- Event group 107
- Alarm group 107
- RMON configuration task list 108
- Configuring a history entry 111
- Configuring an event entry 112
- Configuring an alarm entry 113
- Displaying RMON statistics 114
- Displaying RMON event logs 117
- RMON configuration example 118
- Verifying the configuration 121
- Configuring energy saving 122
- Item Descri 123
- Configuring SNMP 124
- SNMP protocol versions 125
- Enabling SNMP agent 126
- Configuring an SNMP view 128
- Adding rules to an SNMP view 129
- Configuring an SNMP group 131
- Configuring an SNMP user 133
- Network requirements 137
- Configuring the agent 137
- Configuring the NMS 139
- SNMPv3 configuration example 140
- Configuring VLANs 146
- VLAN types 147
- Port-based VLAN 148
- Frame handling methods 149
- Creating VLANs 152
- Setting the PVID for a port 154
- Selecting VLANs 155
- Modifying a VLAN 156
- Modifying ports 157
- VLAN configuration example 158
- Configuration guidelines 162
- Configuring VLAN interfaces 163
- Modifying a VLAN interface 165
- Configuring a voice VLAN 169
- Configuring Switch A 176
- Types of MAC address entries 187
- Configuring MSTP 190
- Basic concepts in STP 191
- Path cost 192
- Calculation process 192
- Example of STP calculation 193
- Introduction to RSTP 197
- Introduction to MSTP 198
- MST region 199
- Port states 201
- How MSTP works 202
- Configuring an MST region 204
- Configuring MSTP globally 205
- Configuring MSTP on a port 208
- MSTP configuration example 212
- Configuration procedure 213
- Configuring Switch B 215
- Configuring Switch C 216
- Configuring Switch D 216
- Link aggregation modes 219
- Dynamic aggregation mode 220
- Configuration procedures 221
- Setting LACP priority 224
- Configuring LLDP 230
- LLDPDUs 231
- LLDP operating modes 234
- Working mechanism 234
- Protocols and standards 235
- Enabling LLDP on ports 236
- Configuring LLDP globally 240
- LLDP configuration example 249
- Configuring ARP 255
- ARP table 256
- Configuring ARP entries 257
- Removing ARP entries 258
- Configuring gratuitous ARP 259
- Configuring ARP detection 263
- Configuring IGMP snooping 265
- How IGMP snooping works 267
- Configuring MLD snooping 279
- How MLD snooping works 281
- Default route 292
- Configuration considerations 296
- DHCP overview 305
- IP address lease extension 306
- DHCP message format 307
- DHCP options 308
- Configuring DHCP relay agent 310
- Task Remarks 311
- Creating a DHCP server group 313
- Configuring DHCP snooping 319
- Enabling DHCP snooping 322
- Managing services 327
- Item Descri 329
- Using diagnostic tools 330
- Ping operation 331
- Traceroute operation 332
- 4. Click Start 333
- Configuring 802.1X 334
- Packet formats 335
- EAP over RADIUS 336
- EAP-Message 337
- Message-Authenticator 337
- EAP relay 339
- EAP termination 340
- 802.1X timers 341
- VLAN assignment 342
- Guest VLAN 342
- Auth-Fail VLAN 343
- Configuration prerequisites 344
- Configuring 802.1X globally 345
- Configuring 802.1X on a port 346
- Configuring IP addresses 350
- Configuring a RADIUS scheme 356
- Configuring AAA 358
- Configuring an ACL 361
- Configuring an ISP domain 367
- AAA configuration example 372
- Configuring RADIUS 376
- RADIUS packet format 378
- Extended RADIUS attributes 380
- Adding RADIUS servers 386
- RADIUS configuration example 387
- Configuring users 393
- Configuring a user group 395
- Managing certificates 397
- How PKI works 398
- PKI applications 399
- Creating a PKI entity 401
- Creating a PKI domain 403
- Generating an RSA key pair 406
- Destroying the RSA key pair 407
- 3. Click Request Cert 409
- Version CRL version number 411
- PKI configuration example 412
- Configuring the switch 413
- MAC authentication timers 418
- ACL assignment 418
- Configuring a local user 422
- 1. Create an ISP domain: 427
- Request timed out 433
- Configuring port security 434
- Configuring permitted OUIs 442
- Configuring port isolation 453
- Configuring authorized IP 456
- Configuring ACLs 463
- Rule numbering 464
- Rule numbering step 464
- Configuring a time range 466
- Adding an IPv4 ACL 467
- Adding an IPv6 ACL 474
- Configuring QoS 479
- Impacts 480
- Countermeasures 480
- End-to-end QoS 481
- Traffic classification 481
- Packet precedences 482
- 802.1p priority 483
- Queue scheduling 484
- WRR queuing 485
- Rate limit 486
- Priority mapping 487
- Adding a class 491
- Adding a traffic behavior 493
- Adding a policy 496
- Applying a policy to a port 497
- Configuring Switch 502
- Configuring PoE 510
- PoE configuration example 514
- Support and other resources 516
- Conventions 517
- Network topology icons 518
- Port numbering in examples 518
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