Reference Guide

Parameters
trust-
downstream
Configure the system to trust Option 82 when it is received
from the previous-hop router.
Defaults Disabled.
Command
Modes
CONFIGURATION
Command
History
Version 9.0(1.3) Introduced on the S5000.
ip dhcp snooping
Enable DHCP Snooping globally.
S5000
Syntax
[no] ip dhcp snooping
Defaults Disabled.
Command
Modes
CONFIGURATION
Command
History
Version 9.0(1.3) Introduced on the S5000.
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.
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.
S5000
Syntax
[no] ip dhcp snooping binding mac address vlan-id vlan-id ip
ip-address interface type slot/port lease number
Parameters
mac address Enter the keyword mac followed by the MAC address of the
host to which the server is leasing the IP address.
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Security