Reference Guide

Dynamic Host Configuration Protocol (DHCP) | 509
ip dhcp snooping
c e s
Enable DHCP Snooping globally.
Syntax [no] ip dhcp snooping
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.
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