R21xx-HP FlexFabric 11900 Layer 3 IP Services Configuration Guide

Configuring DHCP server compatibility

Perform this task to enable the DHCP server to support DHCP clients that are incompliant with RFC.

Configuring the DHCP server to broadcast all responses

Typically, the DHCP server broadcasts a response only when the broadcast flag in the DHCP request is

set to 1. To work with DHCP clients that set the broadcast flag to 0 but do not accept unicast responses,

configure the DHCP server to ignore the broadcast flag and always broadcast a response.

Upon receiving a DHCP request from a DHCP relay agent (the giaddr field is not 0), the DHCP server

unicasts a response (the destination address is giaddr) to the DHCP relay agent regardless of whether it

is enabled to broadcast all responses.

To configure the DHCP server to broadcast all responses:

Ste

Command

Remarks

1. Enter system view.

system-view N/A

2. Enable the DHCP server to

broadcast all responses.

dhcp server always-broadcast

By default, the DHCP server looks at

the broadcast flag to decide

whether to broadcast or unicast a

response.

Configure the DHCP server to ignore BOOTP requests

The lease duration of the IP addresses obtained by the BOOTP clients is unlimited. For some scenarios

that do not allow unlimited leases, you can configure the DHCP server to ignore BOOTP requests.

To configure the DHCP server to ignore BOOTP requests:

Ste

Command

Remarks

1. Enter system view.

system-view N/A

2. Configure the DHCP server to

ignore BOOTP requests.

dhcp server bootp ignore

By default, the DHCP server

processes BOOTP requests.

Configuring the DHCP server to send BOOTP responses in RFC

1048 format

The format of the Vend field in the requests sent by some BOOTP clients is not compatible with RFC 1048.

By default, the DHCP server does not process the Vend field of such packets and copies the field into the

responses.

This function enables the DHCP server to fill in the Vend field using the RFC 1048-compliant format in

DHCP responses to RFC 1048-incompliant requests sent by BOOTP clients that request statically bound

addresses.

To configure the DHCP server to send BOOTP responses in RFC 1048 format: