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Chapter 17 IP Source Guard
MES-2110 User’s Guide
122
DHCP Snooping
Option
Select Enable to have the Switch add DHCP relay agent option
82 information to DHCP requests that the Switch relays to a
DHCP server for each VLAN. Otherwise, select Disable.
DHCP VLAN (Fixed) Enter the ID of a static VLAN; the valid range is between 1 and
4094.
Port This field displays the port number. If you configure the * port,
the settings are applied to all of the ports.
Trust Use this to set trusted ports.
Trusted ports are connected to DHCP servers or other switches,
and the Switch discards DHCP frames from trusted ports only if
the rate at which DHCP frames arrive is too high.
Untrust Use this to set un-trusted ports.
Untrusted ports are connected to subscribers, and the Switch
discards DHCP frames from untrusted ports in the following
situations:
• The frame is a DHCP server frame (for example, OFFER, ACK,
or NACK).
• The source MAC address and source IP address in the frame
do not match any of the current bindings.
• The frame is a RELEASE or DECLINE frame, and the source
MAC address and source port do not match any of the current
bindings.
• The rate at which DHCP frames arrive is too high.
All Port Use this to configure all ports as trusted or un-trusted ports.
Undo Click this to reset the values in this screen to their last-saved
values.
Apply Click Apply to save your changes to the Switch’s run-time
memory. The Switch loses these changes if it is turned off or
loses power, so use the Save link on the top navigation panel to
save your changes to the non-volatile memory when you are
done configuring.
DHCP Snooping Status
Action This shows whether DHCP snooping is enabled or disabled.
DHCP snooping VLAN
Mode
This shows whether the Switch forwards DHCP frames of any
VLANs or specific VLANs to DHCP servers.
DHCP Snooping
Option
This specifies whether or not the Switch enabled or disabled
adding DHCP relay agent option 82 information to DHCP requests
that the Switch relays to a DHCP server for each VLAN.
DHCP VLAN (Fixed) This shows the specific VLAN ID.
Trust/Untrust This shows whether the port is trusted or un-trusted.
Table 49 Configuration > DHCP Snooping > DHCP Snooping Configuration
LABEL DESCRIPTION
- MES-2110 1
- About This User's Guide 3
- Customer Support 4
- Document Conventions 5
- Icons Used in Figures 6
- Safety Warnings 7
- Contents Overview 10
- MES-2110 User’s Guide 10
- Table of Contents 11
- Introduction and 17
- Hardware 17
- CHAPTER 1 19
- 1.1.2 Bridging Example 20
- 1.1.5 Metro Ethernet 22
- Figure 5 Metro Ethernet 23
- CHAPTER 2 25
- 2.3.1.1 Precautions 27
- CHAPTER 3 29
- 3.1.1 Console Port 30
- 3.1.3 Mini-GBIC Slots 31
- 3.1.3.2 Transceiver Removal 32
- 3.1.4 Power Connector 33
- 3.2 LEDs 34
- Basic Configuration 35
- CHAPTER 4 37
- (1234 by default) 38
- 4.3 The Main Screen 39
- LINK DESCRIPTION 42
- 4.5 Switch Lockout 45
- 4.6 Resetting the Switch 45
- Username: admin 46
- Password: 46
- MES-2110> enable 46
- MES-2110# reset default 46
- CHAPTER 5 47
- Chapter 5 System Details 50
- PART III 51
- CHAPTER 6 53
- Chapter 6 Configuration 54
- Chapter 6 Configuration 55
- Status screen as shown next 55
- 6.4 The RMON Status Screen 57
- CHAPTER 7 59
- Chapter 7 Loop Detection 61
- Chapter 7 Loop Detection 62
- CHAPTER 8 63
- Chapter 8 Jumbo Frame 64
- CHAPTER 9 65
- 9.1.2 Guest VLAN 66
- 9.6 Technical Reference 71
- CHAPTER 10 75
- 10.1.2 How STP Works 76
- 10.1.3 STP Port States 77
- Chapter 10 Bridge 79
- Chapter 10 Bridge 80
- CHAPTER 11 83
- 11.3 The VLAN Type Screen 85
- 11.5.1 VLAN Stacking 87
- 11.5.2 VLAN Stacking Example 87
- 11.5.4 VLAN Tag Format 89
- 11.5.5 Frame Format 89
- Table 32 802.1Q Frame 90
- Chapter 11 VLAN 91
- CHAPTER 12 95
- Chapter 12 Bandwidth Control 96
- CHAPTER 13 97
- CHAPTER 14 99
- Chapter 14 Port Mirroring 100
- LABEL DESCRIPTION 100
- CHAPTER 15 101
- 15.3 Static Trunking Example 102
- 15.6 LACP Link Status 105
- Chapter 15 Link Aggregation 106
- CHAPTER 16 107
- 16.2 IGMP Configuration 108
- Chapter 16 IGMP 109
- 16.3 IGMP Status 110
- 16.4 MVR Overview 110
- 16.4.1 Types of MVR Ports 111
- 16.4.2 MVR Modes 111
- 16.4.3 How MVR Works 111
- Chapter 16 IGMP 118
- CHAPTER 17 119
- Chapter 17 IP Source Guard 122
- 17.3 DHCP Binding Table 123
- CHAPTER 18 127
- MAC Table Configuration 128
- Chapter 18 MAC 131
- Chapter 18 MAC 134
- CHAPTER 19 135
- Chapter 19 QoS 137
- 19.4 The Tag Priority Table 139
- Chapter 19 QoS 142
- Management 143
- CHAPTER 20 145
- Table 62 SNMP Commands 147
- 20.4 The SNTP Screen 148
- 20.5 Alarms and Logs 150
- 20.7 The Cable Test Screen 152
- 20.8 The Host DoS Protection 153
- 20.10 Upgrading the Firmware 155
- 20.12 Restarting the System 156
- Troubleshooting & 159
- Product 159
- Specifications 159
- CHAPTER 21 161
- 21.2 Switch Access and Login 162
- CHAPTER 22 165
- FEATURE DESCRIPTION 166
- STANDARD DESCRIPTION 168
- Appendices and 169
- APPENDIX A 171
- Appendix A Changing a Fuse 172
- APPENDIX B 173
- Appendix B Common Services 174
- Appendix B Common Services 175
- APPENDIX C 177
- FCC Warning 178
- CE Mark Warning: 178
- Warning: 178
- Notices 178
- ZyXEL Limited Warranty 179
- Appendix C Legal Information 180
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