Administrator Guide

Command Modes CONFIGURATION
Command History
This guide is platform-specific. For command information about other platforms, see the relevant Dell Networking
OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.9(0.0) Introduced on the C9010.
9.7(0.0) Introduced on the S6000-ON.
9.4.(0.0) Added support for VRF.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
8.3.1.0 Introduced on the E-Series.
7.8.1.0 Introduced on C-Series and S-Series.
Example
Dell(conf)#ip dhcp relay information-option vpn
ip dhcp snooping
Enable DHCP snooping globally.
C9000 Series
Syntax
[no] ip dhcp snooping
Defaults Disabled
Command Modes CONFIGURATION
Command History
This guide is platform-specific. For command information about other platforms, refer to the relevant Dell
Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.9(0.0) Introduced on the C9010.
9.2(1.0) Introduced on the Z9500.
9.2.(0.0) Introduced on the S4810 and S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.1.0 Introduced on the E-Series.
8.2.1.0 Introduced on the C-Series and S-Series on Layer 2 interfaces.
7.8.1.0 Introduced on the C-Series and S-Series on Layer 3 interfaces.
Usage Information
When enabled, no learning takes place until you enable snooping on a VLAN. After disabling DHCP snooping, the
binding table deletes and Option 82, IP Source Guard, and Dynamic ARP Inspection are disabled.
DHCP snooping supports Layer 3 using DHCP Relay Agent (ip helper-address) and Layer 2. 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.
Dynamic Host Configuration Protocol (DHCP) 603