Configure DHCP on a Brouter Port or a VRF Instance

Before you begin

  • You must first enable BootP/DHCP relay on a port (or VLAN).

  • You must enable DHCP and forwarding path.

  • You must enable IP Routing on the interface.

  • To perform this procedure on a non-default VRF, you must first change the VRF instance. For information about how to use EDM for a non-default VRF, see Select and Launch a VRF Context View. All parameters might not be available in non-default VRFs.

About this task

Use the DHCP tab to configure the DHCP behavior on a brouter port or a VRF instance. The DHCP tab is available only if the port is routed (that is, assigned an IP address).

Procedure

  1. In the Device Physical View tab, select a port.
  2. In the navigation pane, expand Configuration > Edit > Port.
  3. Select IP.
  4. Select the DHCP Relay tab.
  5. Select Enable to select the DHCP option.
  6. Configure the other parameters as needed.
  7. Select Apply.

DHCP field descriptions

Use data from the following table in the DHCP Relay tab.

Name

Description

Enable

Lets you use BootP/DHCP on the port. The default is disable.

MaxHop

Sets the maximum number of hops before a BootP/DHCP packet is discarded (1 to 16). The default is 4.

MinSec

The secs field in the BootP/DHCP packet header represents the elapsed time since the client first sent the message. If the secs field in the packet header is greater than this value, the system relays or forwards the packet; otherwise, the packet is dropped. The default is 0 seconds.

Mode

Sets the interface to process only BootP, only DHCP, or both types of packets. The default is both.

AlwaysBroadcast

When enabled, the server reply is sent as a broadcast back to the end station. The default is disable.

CircuitId

Indicates whether DHCP Relay inserted the option 82 circuit ID information into the DHCP packets before sending the DHCP packets to the DHCP server. The default is disable.

RemoteId

Indicates whether DHCP Relay inserted the option 82 remote ID information into the DHCP packets before sending the DHCP packets to the DHCP server. The default is disable.

Trusted

Indicates if DHCP packets come through a trusted DHCP circuit. Only packets with GIADDR configured to 0 and containing option 82 are forwarded if the circuit is trusted. The default value is false.
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