CLI Guide

Layer 3 Routing Commands 1489
Default Configuration
This check is enabled by default.
Command Mode
Interface Configuration (VLAN) mode
User Guidelines
Enable DHCP Relay using the ip helper enable command. Use the global
configuration command ip dhcp relay information option command to
enable processing of DHCP circuit ID and remote agent ID options. DHCP
replies are checked by default. The network administrator should ensure that
only one switch in the path between the DHCP client and server processes
DHCP information options.
Example
The following example enables relay information check on the interface:
console(config)#interface vlan 10
console(config-if-vlan10)#ip dhcp relay information check-reply
ip dhcp relay information option
Use the ip dhcp relay information option command in Global Configuration
mode to globally enable insertion of the circuit ID option and remote agent
ID mode for BootP/DHCP Relay on the system (also called option 82). Use
the no form of the command to globally disable the circuit ID option and
remote agent ID mode for BootP/DHCP Relay.
Syntax
ip dhcp relay information option
no ip dhcp relay information option
Default Configuration
Disabled is the default configuration.
Command Mode
Global Configuration mode, Virtual Router Configuration mode