Users Guide

Layer 3 Routing Commands 1476
User Guidelines
The VRF identified in the parameter must have been previously created or an
error is returned.
Example
console#clear ip helper statistics
ip dhcp relay information check
Use the ip dhcp relay information check command to enable DHCP Relay to
check that the relay agent information option in forwarded BOOTREPLY
messages is valid. If an invalid message is received, the relay agent drops it.
This information check will take effect, though enabled, only when the relay
agent interface is enabled to insert the suboptions.
Syntax
ip dhcp relay information check
no ip dhcp relay information check
Default Configuration
This is enabled by default for a DHCP relay agent.
Command Mode
Global Configuration mode, Virtual Router Configuration mode
User Guidelines
Enable DHCP Relay using the ip helper enable command. Interface
configuration takes precedence over global configuration. However if there is
no interface configuration then global configuration is followed.
This check is enabled by default. The administrator has to ensure that the
relay should be configured such that only it should insert option-82 fields and
no other device near the client has the facility to insert options.
When in Virtual Router Configuration mode, this command operates within
the context of the virtual router instance. When in Global Configuration
mode, the command operates on the global router instance.