Reference Guide

Security | 855
Command History
Related
Commands
ip dhcp relay
z
Enable Option 82.
Syntax
ip dhcp relay information-option [trust-downstream]
Parameters
Command Modes
CONFIGURATION
Default
Disabled
Command History
ip dhcp snooping
z
Enable DHCP Snooping globally.
Syntax
[no] ip dhcp snooping
Command Modes
CONFIGURATION
Default
Disabled
Command History
Usage Information
When enabled, no learning takes place until snooping is enabled on a VLAN. Upon 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 database
z
Delay writing the binding table for a specified time.
Syntax
ip dhcp snooping database write-delay minutes
Version 9.0.2.0 Introduced on the S6000.
Version 8.3.11.1 Introduced on Z9000
show ip dhcp snooping Display the contents of the DHCP binding table.
S6000
trust-downstream
Configure the system to trust Option 82 when it is received from the
previous-hop router.
Version 9.0.2.0 Introduced on the S6000.
Version 8.3.11.1 Introduced on Z9000
S6000
Version 9.0.2.0 Introduced on the S6000.
Version 8.3.11.1 Introduced on Z9000
ip dhcp snooping vlan Enable DHCP Snooping on one or more VLANs.
S6000