DHCPv6 Configuration
Fixed Switch Configuration Guide 25-15
address, a multicast address, or a link-local address. If the address is a multicast or link-local
address, then you must also specify the interface to be used to contact the DHCPv6 server.
Alternatively, you can specify only the interface to be used to contact the DHCPv6 server and the
Fixed Switch device will use the DHCPV6-ALL-AGENTS multicast address (FF02::1:2) to relay
DHCPv6 messages to the DHCPv6 server.
The show ipv6 dhcp interface command, in router privileged execution mode, will display how
an interface has been configured.
DHCPv6 Server Configuration
DHCPv6 server configuration consists of creating pools containing stateless and/or prefix
delegation parameters that should be used by the DHCPv6 server, then configuring an interface as
a DHCPv6 server and assigning the pools to be used.
Pool Configuration
DHCPv6 pools are used to specify information for the DHCPv6 server to distribute to DHCPv6
clients. These pools are shared between multiple interfaces over which DHCPv6 server
capabilities are configured.
After executing the ipv6 dhcp pool command in global router configuration mode, and entering
pool configuration mode, you can configure the following pool parameters:
• The DNS domain name for the pool which is provided to DHCPv6 clients by the DHCPv6
server. A DNS domain name is configured for stateless server support. A DHCPv6 pool can
have up to 8 domain names configured for it.
• The IPv6 DNS server address which is provided to DHCPv6 clients by the DHCPv6 server. A
DNS server address is configured for stateless server support. A DHCPv6 pool can have up to
8 DNS server addresses configured for it.
• An IPv6 address prefix to be delegated to a specific prefix delegation client, identified by their
DHCP unique identifier. Refer to RFC 3633, “IPv6 Prefix Options for Dynamic Host
Configuration Protocol (DHCP) version 6,” for more information about prefix delegation.
Refer to RFC 3315 for information about the DHCP Unique Identifier (DUID) of the prefix
delegation client.
Server Configuration
After configuring the pools, you can configure DHCPv6 server functionality on an interface with
the ipv6 dhcp server command in interface configuration mode. You can specify:
• The pool to be used, by name.
• Whether the server should use the Rapid Commit option that allows for an abbreviated
exchange between DHCPv6 client and server. Refer to RFC 3315 for more information.
• The server’s preference value, which is used by clients to determine preference among
multiple servers.
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