Enabling Handling Of Option 82; Configuring Dhcp Server Compatibility; Configuring The Dhcp Server To Broadcast All Responses; Configure The Dhcp Server To Ignore Bootp Requests - H3C MSR 2600 Configuration Manual

Enabling handling of Option 82

Perform this task to enable the DHCP server to handle Option 82. Upon receiving a DHCP request that
contains Option 82, the DHCP server adds Option 82 into the DHCP response.
If you disable the DHCP to handle Option 82, it does not add Option 82 into the response message.
You must enable handling of Option 82 on both the DHCP server and the DHCP relay agent to ensure
correct processing for Option 82. For information about enabling handling of Option 82 on the DHCP
relay agent, see
To enable the DHCP server to handle Option 82:
Step
1. Enter system view.
2. Enable the server to handle
Option 82.

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.
If a DHCP request is from a DHCP client that has an IP address (the ciaddr field is not 0), the DHCP server
always unicasts a response (the destination address is ciaddr) to the DHCP client regardless of whether
this command is executed.
If a DHCP request is from a DHCP relay agent (the giaddr field is not 0), the DHCP server always 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:
Step
1. Enter system view.
2. Enable the DHCP server to
broadcast all responses.

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.
"Configuring Option 82."
Command
system-view
dhcp server always-broadcast
Command
system-view
dhcp server relay information enable
46
Remarks
N/A
By default, handling of
Option 82 is enabled.
Remarks
N/A
By default, the DHCP server looks at
the broadcast flag to decide
whether to broadcast or unicast a
response.