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If you use the option command with the same code specified, the most recent configuration takes
effect.
You can customize options for the following purposes:
Add newly released options.
Add options for which the vendor defines the contents, for example, Option 43.
Add options for which the CLI does not provide a dedicated configuration command. For
example, you can use the option 4 ip-address 1.1.1.1 command to define the time server
address 1.1.1.1 for DHCP clients.
Add all option values if the actual requirement exceeds the limit for a dedicated option
configuration command. For example, the dns-list command can specify up to eight DNS
servers. To specify more than eight DNS server, you must use the option 6 command to define
all DNS servers.
If a DHCP option is specified by both the dedicated command and the option command, the DHCP
server assigns the content specified by the dedicated command. For example, if a DNS server
address is specified by the dns-list command and the option 6 command, the server uses the
address specified by dns-list command.
Examples
# Configure Option 7 to specify the log server address 2.2.2.2 in address pool 0.
<Sysname> system-view
[Sysname] dhcp server ip-pool 0
[Sysname-dhcp-pool-0] option 7 ip-address 2.2.2.2
Related commands
display dhcp server pool
reset dhcp server conflict
Use reset dhcp server conflict to clear IP address conflict information.
Syntax
reset dhcp server conflict [ ip ip-address ]
Views
User view
Predefined user roles
network-admin
Parameters
ip ip-address: Clears conflict information about the specified IP address. If you do not specify this
option, this command clears all address conflict information.
Usage guidelines
Address conflicts occur when dynamically assigned IP addresses have been statically configured for
other hosts. After you modify the address pool configuration, the conflicted addresses might become
assignable. To assign these addresses, use the reset dhcp server conflict command to clear the
conflict information first.
Examples
# Clear all IP address conflict information.
<Sysname> reset dhcp server conflict
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