Reference Guide

Dynamic Host Configuration Protocol (DHCP) | 467
Command Modes
CONFIGURATION
Default
Disabled
Command
History
Usage
Information
When enabled, no learning takes place until snooping is enabled on a VLAN. Upon disabling DHCP
Snooping the binding table is deleted, and Option 82, IP Source Guard, and Dynamic ARP Inspection
are disabled.
Introduced in FTOS version 7.8.1.0, DHCP Snooping was available for Layer 3 only and dependent on
DHCP Relay Agent (ip helper-address). FTOS version 8.2.1.0 extends DHCP Snooping to Layer 2,
and you do not have to enable relay agent to snoop on Layer 2 interfaces.
Related
Commands
ip dhcp snooping database
c e s
Delay writing the binding table for a specified time.
Syntax
ip dhcp snooping database write-delay minutes
Parameters
Command Modes
CONFIGURATION
Default
None
Command
History
ip dhcp snooping binding
c e s
Create a static entry in the DHCP binding table.
Syntax
[no] ip dhcp snooping binding mac address vlan-id vlan-id ip ip-address interface type
slot/port lease number
Parameters
Version 8.3.1.0 Introduced on E-Series.
Version 8.2.1.0 Introduced on C-Series and S-Series for Layer 2 interfaces.
Version 7.8.1.0 Introduced on C-Series and S-Series on Layer 3 interfaces.
ip dhcp snooping vlan Enable DHCP Snooping on one or more VLANs.
minutes
Range: 5-21600
Version 8.3.1.0 Introduced on E-Series.
Version 7.8.1.0 Introduced on C-Series and S-Series
mac address Enter the keyword mac followed by the MAC address of the host to which the
server is leasing the IP address.
vlan-id vlan-id Enter the keyword vlan-id followed by the VLAN to which the host belongs.
Range: 2-4094
ip ip-address Enter the keyword ip followed by the IP address that the server is leasing.