Chapter 24 IP Source Guard
24.5 DHCP Snooping Configure
Use this screen to enable DHCP snooping on the Switch (not on specific VLAN), specify the VLAN where the default DHCP server is located, and configure the DHCP snooping database. The DHCP snooping database stores the current bindings on a secure, external TFTP server so that they are still available after a restart. To open this screen, click Advanced Application > IP Source Guard > DHCP Snooping > Configure.
Figure 103 DHCP Snooping Configure
The following table describes the labels in this screen.
Table 71 DHCP Snooping Configure
LABEL | DESCRIPTION |
Active | Select this to enable DHCP snooping on the Switch. You still have to |
| enable DHCP snooping on specific VLAN and specify trusted ports. |
| Note: The Switch will drop all DHCP requests if you enable |
| DHCP snooping and there are no trusted ports. |
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DHCP Vlan | Select a VLAN ID if you want the Switch to forward DHCP packets to |
| DHCP servers on a specific VLAN. |
| Note: You have to enable DHCP snooping on the DHCP |
| VLAN too. |
| You can enable Option82 in the DHCP Snooping VLAN Configure |
| screen (Section 24.5.2 on page 211) to help the DHCP servers distinguish |
| between DHCP requests from different VLAN. |
| Select Disable if you do not want the Switch to forward DHCP packets to a |
| specific VLAN. |
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