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Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-25303-03
Chapter 1 Configuring IPv6 Unicast Routing
Configuring IPv6
Default DHCPv6 Address Assignment Configuration
By default, no DHCPv6 features are configured on the switch.
DHCPv6 Address Assignment Configuration Guidelines
When configuring DHCPv6 address assignment, consider these guidelines:
• In the procedures, the specified interface must be one of these Layer 3 interfaces:
–
DHCPv6 IPv6 routing must be enabled on a Layer 3 interface.
–
SVI: a VLAN interface created by using the interface vlan vlan_id command.
–
EtherChannel port channel in Layer 3 mode: a port-channel logical interface created by using
the interface port-channel port-channel-number command.
• Before configuring DHCPv6, you must select a Switch Database Management (SDM) template that
supports IPv4 and IPv6.
• The switch can act as a DHCPv6 client, server, or relay agent. The DHCPv6 client, server, and relay
function are mutually exclusive on an interface.
• The DHCPv6 client, server, or relay agent runs only on the master switch. When there is a stack
master re-election, the new master switch retains the DHCPv6 configuration. However, the local
RAM copy of the DHCP server database lease information is not retained.
Enabling DHCPv6 Server Function
Beginning in privileged EXEC mode, follow these steps to enable the DHCPv6 server function on an
interface.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
ipv6 dhcp pool poolname Enter DHCP pool configuration mode, and define the name
for the IPv6 DHCP pool. The pool name can be a symbolic
string (such as Engineering) or an integer (such as 0).
Step 3
address prefix IPv6-prefix lifetime {t1 t1 | infinite} (Optional) Specify an address prefix for address assignment.
This address must be in hexadecimal, using 16-bit values
between colons.
lifetime t1 t1—Specify a time interval (in seconds) that an
IPv6 address prefix remains in the valid state. The range is 5
to 4294967295 seconds. Specify infinite for no time interval.
Step 4
link-address IPv6-prefix (Optional) Specify a link-address IPv6 prefix.
When an address on the incoming interface or a link-address
in the packet matches the specified IPv6 prefix, the server
uses the configuration information pool.
This address must be in hexadecimal, using 16-bit values
between colons.
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