Administrator Guide

Layer 3 Routing Commands 1466
User Guidelines
The IPv6 DHCP service must be enabled to use this feature. Enable the IPv6
DHCP service using the service dhcpv6 command. If
relay-address is an IPv6
global address, then
relay-interface is not required. If relay-address is a link-
local or multicast address, then
relay-interface is required. Finally, a value for
relay-address is not specified, then a value for relay-interface must be
specified and the DHCPV6-ALLAGENTS multicast address (i.e. FF02::1:2)
is used to relay DHCPv6 messages to the relay server. An IP interface (VLAN)
can be configured in DHCP relay mode or DHCP server mode. Configuring
an interface in DHCP relay mode overwrites the DHCP server mode and vice-
versa.
An IP interface configured in relay mode cannot be configured as a DHCP
client (ip address dhcp).
Example
The following example configures VLAN 15 for DHCPv6 relay functionality.
console(config)#service dhcpv6
console(config)#interface vlan 15
console(config-if-vlan15)#ipv6 dhcp relay destination 2020:1::1
ipv6 dhcp server
Use the ipv6 dhcp server command in Interface Configuration mode to
configure DHCPv6 server functionality on an interface. For a particular
interface DHCPv6 server and DHCPv6 relay functions are mutually exclusive.
Syntax
ipv6 dhcp server pool-name [rapid-commit] [preference pref-value ]
• pool-name — The name of the DHCPv6 pool containing stateless and/or
prefix delegation parameters
•
rapid-commit — An option that allows for an abbreviated exchange
between the client and server.
•
pref-value — Preference value — used by clients to determine preference
between multiple DHCPv6 servers. (Range: 0-4294967295)
2CSNXXX_SWUM204.book Page 1466 Monday, January 25, 2016 1:25 PM