CLI Guide

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
Clear the DHCP binding table.
Syntax
clear ip dhcp snooping binding
Defaults none
Command Modes EXEC Privilege
Command History
This guide is platform-specific. For command information about other platforms,
see the relevant Dell Networking OS Command Line Reference Guide.
Version Description
9.8(2.0) Introduced on the S3100 series.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000–ON.
9.2(1.0) Introduced on the Z9500.
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.
7.8.1.0 Introduced on the C-Series and S-Series.
Related
Commands
• show ip dhcp snooping — display the contents of the DHCP binding table.
ip dhcp relay
Enable Option 82.
Syntax
ip dhcp relay information-option [trust-downstream | vrf]
Parameters
trust-downstream Configure the system to trust Option 82 when it is received
from the previous-hop router.
vrf Enter the keyword vrf to include VRF related information in
the Option 82. This configuration enables the relay agent to
include VRF related information when it forwards the
broadcasts from client to DHCP server.
Security
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