Reference Guide

488 | Dynamic Host Configuration Protocol (DHCP)
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Related
Commands
clear ip dhcp snooping
c e s
Clear the DHCP binding table.
Syntax
clear ip dhcp snooping binding
Command Modes
EXEC Privilege
Default
None
Command
History
Related
Commands
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
arp inspection Enable Dynamic ARP Inspection on a VLAN.
Version 8.3.1.0 Introduced on E-Series.
Version 7.8.1.0 Introduced on C-Series and S-Series
show ip dhcp snooping Display the contents of 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.