Users Guide
Defaults none
Command Modes EXEC Privilege
Supported Modes Full–Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
Related Commands show ip dhcp snooping — displays the contents of the DHCP binding table.
ip dhcp relay
Enable Option 82.
Syntax
ip dhcp relay information-option [trust-downstream]
Parameters
trust-downstream Congure the system to trust Option 82 when it is received from the previous-hop router.
Defaults Disabled.
Command Modes CONFIGURATION
Supported Modes Full–Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
ip dhcp snooping
Enable DHCP Snooping globally.
Syntax
[no] ip dhcp snooping
Defaults Disabled.
Command Modes CONFIGURATION
Supported Modes Full–Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
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.
Security 1201