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ip dhcp snooping
Enable DHCP snooping globally.
Syntax
[no] ip dhcp snooping
Defaults Disabled
Command Modes CONFIGURATION
Supported Modes Full–Switch
Command
History
Version Description
9.9(0.0) Introduced on the FN IOM.
8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
Usage
Information
When enabled, no learning takes place until you enable snooping on a VLAN. After disabling DHCP
snooping, the binding table is deleted, and Option 82, IP Source Guard, and Dynamic ARP Inspection are
disabled.
Introduced in the Dell Networking OS version 7.8.1.0, DHCP snooping was available for Layer 3 only and
dependent on DHCP Relay Agent (ip helper-address). The Dell Networking OS 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 vlan — enables DHCP snooping on one or more VLANs.
ipv6 dhcp snooping
Enable DHCPv6 snooping globally for ipv6.
Syntax
[no] ipv6 dhcp snooping
To disable the snooping globally, use the no ipv6 dhcp snooping command.
Defaults Disabled
Command Modes CONFIGURATION
Supported Modes Full–Switch
Command
History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.7(0.0) Introduced on the MXL.
ip dhcp snooping database
Delay writing the binding table for a specified time.
Syntax
ip dhcp snooping database write-delay minutes
Parameters
minutes The range is from 5 to 21600.
Defaults none
Command Modes CONFIGURATION
Supported Modes Full–Switch
Command
History
Version Description
9.9(0.0) Introduced on the FN IOM.
412 Dynamic Host Configuration Protocol