Use this command to force the DHCP server to send the VPN option (82) to the client.
None.
None.
VRF Configuration command mode.
When forwarding the local UDP broadcasts from a VRF to a destination address on the global router or a different VRF, the DHCP relay agent must include information about itself that the DHCP server will forward to the client. Including Option 82 in the DHCP relay information provides the required DHCP relay information. Use the ip dhcp relay information option vpn command to include DHCP relay agent information in the packet sent to the client by the DHCP server. See ip helper-address for details on changing the destination address for the forwarding of local UDP broadcasts.
The “no” form of this command removes the sending of Option 82 in the DHCP relay information.
The following example:
System(su)->router Alpha-Group System(su-*ha-Group)->configure System(su-*ha-Group-config)->ip forward-protocol udp System(su-*ha-Group-config)->interface vlan.0.10 System(su-*ha-Group-config-intf-vlan.0.10)->ip helper-address 134.141.95.105 vrf Internet-Access System(su-*ha-Group-config-intf-vlan.0.10)->exit System(su-*ha-Group-config)->ip dhcp relay information option vpn System(su-*ha-Group-config)->