UMN:CLI
User Manual
V8102
400
code: DHCP option code
NAME: DHCP option format name
no ip dhcp default-option
code
<1-254>
Removes a specified DHCP default option for a DHCP
server.
9.6.1.10
Static Mapping
The V8102 provides a static mapping function that enables to assign a static IP address
without manually specifying static IP assignment by using a DHCP lease database in the
DHCP database agent.
To perform a static mapping, use the following command.
Command
Mode
Description
origin file A.B.C.D FILE
DHCP Pool
Performs a static mapping.
A.B.C.D: DHCP database agent address
FILE: file name of DHCP lease database
no origin file
Cancels a static mapping.
For more information of the file naming of a DHCP lease database, see Section
9.6.1.11
Recognition of DHCP Client
Normally, a DHCP server is supposed to prohibit assigning an IP address when DHCP
packets have no client ID (CID). However, some Linux clients may send DHCP discover
messages without CID. To solve such a problem, the switch provides the additional option
to verify a hardware address (MAC address) instead of CID.
To select a recognition method of DHCP clients, use the following command.
Command
Mode
Description
ip dhcp database-key
{
client-id
|
hardware-address
}
Global
Selects a recognition method of DHCP clients
9.6.1.12
IP Address Validation
Before assigning an IP address to a DHCP client, a DHCP server will validate if the IP
address is used by another DHCP client with a ping or ARP. If the IP address does not re-
spond to a requested ping or ARP, the DHCP server will realize that the IP address is not
used then will assign the IP address to the DHCP client.
To select an IP address validation method, use the following command.
Command
Mode
Description
ip dhcp validate
{
arp
|
ping
}
Global
Selects an IP address validation method.
You can also set a validation value of how many responses and how long waiting
(timeout) for the responses from an IP address for a requested ping or ARP when a
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