Command Line Reference Guide

1334 | Security
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Secure DHCP Commands
DHCP as defined by RFC 2131 provides no authentication or security mechanisms. Secure DHCP is a
suite of features that protects networks that use dynamic address allocation from spoofing and attacks.
• clear ip dhcp snooping
• ip dhcp relay
• ip dhcp snooping
• ip dhcp snooping database
• ip dhcp snooping binding
• ip dhcp snooping database renew
• ip dhcp snooping trust
• ip dhcp source-address-validation
• ip dhcp snooping vlan
• show ip dhcp snooping
clear ip dhcp snooping
c s
Clear the DHCP binding table.
Syntax
clear ip dhcp snooping binding
Command Modes
EXEC Privilege
Default
None
Command
History
Related
Commands
ip dhcp relay
c s
Enable Option 82.
Syntax
ip dhcp relay information-option [trust-downstream]
Parameters
Command Modes
CONFIGURATION
Default
Disabled
Command
History
Version 7.8.1.0 Introduced on C-Series and S-Series
show ip dhcp snooping Display the contents of the DHCP binding table.
trust-downstream
Configure the system to trust Option 82 when it is received from the
previous-hop router.
Version 7.8.1.0 Introduced on C-Series and S-Series