Dynamic Host Configuration Protocol (DHCP) Snooping VLAN Settings on SFE/SGE Managed Switches

Objective

Dynamic Host Configuration Protocol (DHCP) is a network protocol which allows a computer or a network device to join an IP-based network without having a pre-configured IP address. DHCP assigns a unique IP addresses to those network devices. When the devices leave the network the IP addresses are released. DHCP snooping provides a security feature which acts like a firewall between untrusted hosts and trusted DHCP servers.

This article explains how to configure VLAN settings for DHCP Snooping on SFE/SGE Managed Switches.

Applicable Devices

• SFE/SGE Series Switches

Software Version

• v3.0.2.0

Enable DHCP Snooping

Step 1. Log in to the web configuration utility and choose Security Suite > DHCP Snooping > Properties.  The Properties page opens:

Step 2. In the Enable DHCP Snooping field, check the Enable DHCP Snooping check box to enable the DHCP snooping on the device.

Step 3. Click Apply.

Caution: This only saves your configuration to the running configuration file. This means any changes made will be lost if the device is rebooted. If you wish to save these changes even after a system reboot, you need to copy the running configuration file to the startup configuration file. See Copy Configuration File on SFE/SGE Series Managed Switches for more information on how to do this.

DHCP Snooping VLAN

Step 1. Log into the web configuration utility and choose Security Suite > DHCP Snooping > VLAN Settings. The VLAN Settings page opens:

Step 2. Enter the VLAN ID that you would like to add in the VLAN ID field.

Step 3. Click Add. The Enabled VLANs list shows all the VLANs for which DHCP snooping is enabled.

Step 4. (Optional) To delete a VLAN choose the one which you would like to delete from the Enabled VLANs list. Click Delete.

Caution: This only saves your configuration to the running configuration file. This means any changes made will be lost if the device is rebooted. If you wish to save these changes even after a system reboot, you need to copy the running configuration file to the startup configuration file. See Copy Configuration File on SFE/SGE Series Managed Switches for more information on how to do this.