Configure BootP/DHCP on a VLAN or VRF Instance

Before you begin

  • 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 Relay tab to configure the DHCP behavior on a VLAN. The DHCP Relay tab is available only if the VLAN is routed and is assigned an IP address.

Procedure

  1. In the navigation pane, expand Configuration > VLAN.
  2. Select VLANs.
  3. Select the Basic tab.
  4. Select a VLAN.
  5. Select IP.
  6. Select the DHCP Relay tab.
  7. Select Enable.
  8. Optional: Configure the parameters as required.
  9. Select Apply.

DHCP Relay field descriptions

Use the data in the following table to use the DHCP Relay tab.

Variable

Value

Enable

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

MaxHop

Sets the maximum number of hops a BootP/DHCP packet can take from the DHCP client to the DHCP server. The maximum number of hops is 16. The default is 4.

MinSec

Represents the minimum number of seconds to wait between receiving a DHCP packet and forwarding the DHCP packet to the DHCP server. A value of 0 indicates that forwarding is done immediately. The default value is 0.

Mode

Indicates the type of DHCP packet required. The options are:

  • bootp

  • dhcp

  • both

The default is both.

AlwaysBroadcast

When enabled, the DHCP Reply packets are sent as a broadcast to the DHCP client. 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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