Concept Guide
Parameters
name Enter the name of a VLAN on which to enable 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, the system begins creating entries in the binding table for the specied VLANs.
NOTE: Learning only happens if there is a trusted port in the VLAN.
Related Commands ip dhcp snooping trust — congures an interface as trusted.
ipv6 dhcp snooping vlan
Enable ipv6 DHCP Snooping on VLAN or range of VLANs.
Syntax
[no] ip dhcp snooping vlan vlan-id
To disable the ipv6 dhcp snooping on VLAN basis or range of VLAN, use the no ipv6 dhcp snooping vlan
<vlan-id> command.
Parameters
vlan-id Enter the name of a VLAN id or list of the VLANs to enable DHCP Snooping.
Defaults Disabled
Command Modes CONFIGURATION
Supported Modes Full–Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.7(0.0) Introduced on the MXL.
ip dhcp relay
Enable Option 82.
Syntax
ip dhcp relay information-option [remote-id | trust-downstream]
Parameters
remote-id Congure the system to enable the remote-id string in option-82.
trust-downstream Congure the system to trust Option 82 when it is received from the previous-hop router.
Defaults Disabled
464 Dynamic Host Conguration Protocol