Dell Networking 2048, Reference Manual

Page: 964 / 1823

964
DHCPv6 Commands
•
pref-value
— Preference value
—
used by clients to determine preference
between multiple DHCPv6 servers. (Range: 0-4294967295)
Default Configuration
The default preference value is 20. Rapid commit is not enabled by default.
Command Mode
Interface Configuration (VLAN, Tunnel) mode
User Guidelines
This feature requires the IPv6 DHCP service. Enable the IPv6 DHCP service
using the
service dhcpv6
command. The
ipv6 dhcp server
command enables
DHCP for IPv6 service on a specified interface using the pool for prefix
delegation and other configuration through that interface.
The rapid-commit keyword enables the use of the two-message exchange for
prefix delegation and other configuration. If a client has included a rapid
commit option in the solicit message and the rapid-commit keyword is
enabled for the server, the server responds to the solicit message with a reply
message.
If the preference keyword is configured with a value other than 0, the server
adds a preference option to carry the preference value for the advertise
messages. This action affects the selection of a server by the client. Any
advertise message that does not include a preference option is considered to
have a preference value of 0. If the client receives an advertise message that
includes a preference option with a preference value of 255, the client
immediately sends a request message to the server from which the advertise
message was received.
The DHCP for IPv6 client, server, and relay functions are mutually exclusive
on an interface. When one of these functions is already enabled and a user
tries to configure a different function on the same interface, a message is
displayed.
Example
console#configure
console(config)#service dhcpv6
console(config)# ipv6 dhcp pool pool1
2CSNXXX_SWUM200.book Page 964 Tuesday, December 10, 2013 1:22 PM