Configuration Guide 555
Configuring Network Security DHCP Snooping Configuration
Operation
Strategy
Select the operation for the Option 82 field of the DHCP request packets.
Keep: Indicates keeping the Option 82 field of the packets.
Replace: Indicates replacing the Option 82 field of the packets with one defined
by the switch. By default, the Circuit ID is defined to be the VLAN and the number
of the port which receives the DHCP Request packets. The Remote ID is defined
as the MAC address of the DHCP Snooping device which receives the DHCP
Request packets.
Drop: Indicates discarding the packets that include the Option 82 field.
Circuit ID
Customization
Select Enable to manually define the circuit ID field, which is a sub-option of
Option 82. The circuit ID configurations of the switch and the DHCP server should
be compatible with each other.
Circuit ID Enter the customized circuit ID, which contains up to 64 characters.
Remote ID
Customization
Select Enable to manually define the remote ID field, which is a sub-option of
Option 82. The remote ID configurations of the switch and the DHCP server
should be compatible with each other.
Remote ID Enter the customized remote ID, which contains up to 64 characters.
LAG Displays the LAG that the port is in.
2) Click Apply.
3.2 Using the CLI
3.2.1 Enabling DHCP Snooping on VLAN
Follow these steps to globally configure DHCP Snooping:
Step 1 configure
Enter global configuration mode.
Step 2 ip dhcp snooping
Globally enable DHCP Snooping.
Step 3 ip dhcp snooping vlan
vlan-range
Enable DHCP Snooping on the specified VLAN.
vlan-range:
Enter the vlan range in the format of 1-3, 5.
Step 4 show ip dhcp snooping
Verify global configuration of DHCP Snooping.
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