Administrator Guide

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.
ip dhcp snooping binding
Create a static entry in the DHCP binding table.
Syntax
[no] ip dhcp snooping binding mac address vlan-id vlan-id ip ip-address
interface interface-type lease number
Parameters
mac address Enter the keyword mac then the MAC address of the host to which the server is
leasing the IP address.
vlan-id vlan-id Enter the keywords vlan-id then the VLAN to which the host belongs. The range
is from 2 to 4094.
ip ip-address Enter the keyword ip then the IP address that the server is leasing.
interface type Enter the keyword interface then the type of interface to which the host is
connected:
● For a 10-Gigabit Ethernet interface, enter the keyword
TenGigabitEthernet then the slot/port information.
● For a 40-Gigabit Ethernet interface, enter the keyword fortyGigE then the
slot/port information.
Dynamic Host Configuration Protocol (DHCP) 641