Configuring Ip Address Conflict Detection; Enabling Handling Of Option 82 - HP FlexNetwork MSR2003 Configuration Manual

Upon receiving a DHCP request from the interface, the DHCP server performs address allocation in
the following ways:
•
If a static binding is found for the client, the server assigns the static IP address and
configuration parameters from the address pool that contains the static binding.
•
If no static binding is found for the client, the server uses the address pool applied to the
interface for address and configuration parameter allocation.
To apply an address pool on an interface:
Step
1. Enter system view.
2. Enter interface view.
3. Apply an address pool on the
interface.

Configuring IP address conflict detection

Before assigning an IP address, the DHCP server pings that IP address.
•
If the server receives a response within the specified period, it selects and pings another IP
address.
•
If it receives no response, the server continues to ping the IP address until a specific number of
ping packets are sent. If still no response is received, the server assigns the IP address to the
requesting client. The DHCP client uses gratuitous ARP to perform IP address conflict
detection.
To configure IP address conflict detection:
Step
1. Enter system view.
2. (Optional.) Set the maximum
number of ping packets to be
sent for conflict detection.
3. (Optional.) Set the ping
timeout time.

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
Command
system-view
interface interface-type
interface-number
dhcp server apply ip-pool
pool-name
Command
system-view
dhcp server ping packets
number
dhcp server ping timeout
milliseconds
"Configuring Option 82."
50
Remarks
N/A
N/A
By default, no address pool is applied
on an interface.
If the applied address pool does not
exist, the DHCP server fails to perform
dynamic address allocation.
Remarks
N/A
The default setting is one.
The value 0 disables IP address
conflict detection.
The default setting is 500 ms.
The value 0 disables IP address
conflict detection.