Command Line Reference Guide

450 | Dynamic Host Configuration Protocol (DHCP)
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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
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