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xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch
143
Check
option 82 field.
Enabled– When the field is toggled to Enable, the relay agent will check the validity of
the packet’s option 82 field. If the switch receives a packet that contains the option-82
field from a DHCP client, the switch drops the packet because it is invalid. In packets
received from DHCP servers, the relay agent will drop invalid messages.
Disabled- When the field is toggled to Disabled, the relay agent will not check the
validity of the packet’s option 82 field.
DHCP Agent
Information Option 82
Policy
This field can be toggled between Replace, Drop, and Keep by using the pull-down
menu. It is used to set the Switches policy for handling packets when the DHCP
Agent Information Option 82 Check is set to Disabled. The default is Replace.
Replace- The option 82 field will be replaced if the option 82 field already exists in the
packet received from the DHCP client.
Drop- The packet will be dropped if the option 82 field already exists in the packet
received from the DHCP client.
Keep-The option 82 field will be retained if the option 82 field already exists in the
packet received from the DHCP client.
Click Apply to implement any changes that have been made.
NOTE: If the switch receives a packet that contains the option-82 field from a
DHCP client and the information-checking feature is enabled, the switch drops
the packet because it is invalid. However, in some instances, you might configure
a client with the option-82 field. In this situation, you should disable the
information-check feature so that the switch does not remove the option-82 field
from the packet. You can configure the action that the switch takes when it
receives a packet with existing option-82 information by configuring the DHCP
Agent Information Option 82 Policy.
The Implementation of DHCP Information Option 82 in DES-3828P/DES-
3828DC
The config dhcp_relay option_82 command configures the DHCP relay agent information option 82
setting of the switch. The formats for the circuit ID sub-option and the remote ID sub-option are as
follows:
NOTE: For the circuit ID sub-option of a standalone switch, the module field is
always zero.
Circuit ID sub-option format:
1. 2. 3. 4. 5. 6. 7.
1 6 0 4 VLAN Module Port
1 byte 1 byte 1 byte 1 byte 2 bytes 1 byte 1 byte
a. Sub-option type
- User Manual 1
- Table of Contents 3
- Preface 9
- Intended Readers 10
- Typographical Conventions 10
- Notes, Notices, and Cautions 10
- Safety Instructions 11
- Introduction 15
- Switch Description 16
- Features 16
- Front-Panel Components 18
- DES-3828P LEDs 19
- DES-3828/DES-3828DC LEDs 19
- • Off – Link down 20
- Rear Panel Description 21
- Side Panel Description 22
- Gigabit Ports 23
- Installation 24
- Rubber Feet 25
- Power On AC Power 26
- Power Failure 26
- RPS Installation 27
- DPS-800 28
- Connect to RPS 29
- DPS-600 30
- DES-3828P 31
- Connecting The Switch 32
- Switch or Hub 33
- Section 4 34
- Password Protection 37
- SNMP Settings 38
- IP Address Assignment 39
- Web-based User Interface 43
- Web Pages 44
- Administration 45
- IP Address 48
- Port Configuration 50
- Port Description 52
- PoE Configuration 54
- User Accounts 57
- Port Mirroring 58
- System Log Host 59
- System Severity Settings 62
- SNTP Settings 63
- Time Zone and DST 64
- Minutes 65
- 30, 60, 90, or 120 minutes 65
- Mean Time (GMT.) 65
- MAC Notification Settings 66
- TFTP Services 68
- Multiple Image Services 69
- Ping Test 71
- SNMP Manager 71
- SNMP User Table 72
- SNMP View Table 75
- SNMP Group Table 76
- SNMP Host Table 79
- SNMP Engine ID 81
- Backup/Restore 82
- Layer 2 Features 83
- VLAN Description 84
- IEEE 802.1Q VLANs 84
- 802.1Q VLAN Tags 85
- Port VLAN ID 86
- Tagging and Untagging 87
- Ingress Filtering 87
- Default VLANs 88
- Port-based VLANs 88
- VLAN Segmentation 88
- Static VLAN Entry 89
- GVRP Setting 92
- Trunking 94
- Link Aggregation 96
- LACP Port Setting 98
- IGMP Snooping 100
- Static Router Ports Entry 102
- Spanning Tree 103
- 802.1w Rapid Spanning Tree 104
- Port Transition States 104
- STP Bridge Global Settings 105
- • Remove VID - Select this 109
- MSTP Port Information 110
- STP Instance Settings 112
- STP Port Settings 113
- Forwarding 117
- Layer 3 Features 119
- MD5 Key Table Configuration 122
- Static ARP Table 125
- RIP Version 1 Message Format 127
- RIP Global Settings 128
- RIP Interface Settings 129
- Link-State Algorithm 131
- Shortest Path Algorithm 131
- OSPF Cost 131
- Shortest Path Tree 131
- Areas and Border Routers 133
- Link-State Packets 133
- OSPF Authentication 134
- Backbone and Area 0 134
- Virtual Links 135
- Partitioning the Backbone 135
- Neighbors 135
- Adjacencies 135
- Designated Router Election 136
- Building Adjacency 136
- OSPF Packet Formats 136
- OSPF Packet Header 137
- Hello Packet 138
- Database Description Packet 139
- Link-State Request Packet 140
- Link-State Update Packet 141
- Router Links Advertisements 143
- Routers Links Advertisements 144
- Description 145
- Network Links Advertisements 146
- Summary Link Advertisements 146
- OSPF Global Settings 148
- OSPF Area Setting 149
- OSPF Interface Settings 150
- OSPF Virtual Link Settings 153
- OSPF Host Route Settings 156
- DHCP/BOOTP Relay 157
- DNS Relay 161
- DNS Relay Static Settings 162
- VRRP Global Settings 163
- VRRP Virtual Router Settings 164
- VRRP Authentication Settings 167
- IGMP Versions 1 and 2 169
- IGMP Interface Settings 170
- DVMRP Global Settings 172
- DVMRP Interface Settings 173
- PIM-DM Configuration 174
- Section 9 177
- Understanding QoS 178
- Port Bandwidth 179
- QoS Scheduling Mechanism 180
- 802.1p Default Priority 181
- 802.1p User Priority 183
- Section 10 184
- Packet Content Mask: 188
- CPU Interface Filtering 199
- Security 215
- Port Security 217
- Port Lock Entries 219
- Authentication Server 220
- Authenticator 221
- Authentication Process 222
- Ethernet Switch 223
- Authentic RADIUS Server 227
- Trusted Host 228
- Authentication Server Group 232
- Authentication Server Host 233
- Login Method Lists 235
- Enable Method Lists 237
- Enable Admin 240
- Traffic Segmentation 241
- Secure Socket Layer (SSL) 242
- Download Certificate 243
- Ciphersuite 243
- SSH Server Configuration 246
- SSH User Authentication 250
- IP-MAC Binding 251
- IP-MAC Binding Table 252
- IP-MAC Binding Blocked 253
- ARP Storm Control 254
- Monitoring 255
- CPU Utilization 256
- Port Utilization 256
- Packets 257
- Received (RX) 258
- UMB Cast (RX) 259
- Transmitted (TX) 261
- Packet Size 268
- Browse Router Port 270
- Port Access Control 270
- RADIUS Accounting 272
- MAC Address 273
- IP Address Table 275
- Browse Routing Table 276
- Browse ARP Table 277
- IGMP Snooping Group 279
- IGMP Snooping Forwarding 280
- Browse IGMP Group Table 280
- DVMRP Monitoring 281
- Browse DVMRP Neighbor Table 282
- OSPF Monitoring 283
- Browse OSPF Neighbor Table 285
- OSPF Virtual Neighbor 285
- Switch History Log 287
- Switch Maintanence 288
- Reboot System 289
- Save Changes 290
- Technical Specifications 292
- Cables and Connectors 295
- Cable Lengths 296
- Glossary 297
- Warrenties/Registration 301
- Technical Support 308
- Техническая поддержка 314
- Asistencia Técnica 315
- Suporte Técnico 316
- Technische Unterstützung 320
- Assistance technique 321
- Supporto tecnico 323
- Pomoc techniczna 325
- Technická podpora 326
- D-Link Magyarország 327
- Teknisk Support 328
- International Offices 332
- Registration Card 333
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