Concept Guide
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 specied 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.
8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
460 Dynamic Host Conguration Protocol