1072 Configuring IPv6 Routing
Configuring IPv6 Interface Settings
Beginning in Privileged EXEC mode, use the following commands to 
configure IPv6 settings for VLAN, tunnel, or loopback interfaces.
Command Purpose
configure Enter Global Configuration mode.
interface {vlan | 
tunnel | loopback} 
interface-id
Enter Interface Configuration mode for the specified VLAN, 
tunnel, or loopback interface.
ipv6 enable Enable IPv6 on the interface. Configuring an IPv6 address 
will automatically enable IPv6 on the interface.
ipv6 address 
{autoconfig | dhcp | 
prefix/prefix-length 
[eui64]}
Configure the IPv6 address and network prefix length. 
Setting an IPv6 address enables IPv6 on the interface. You 
can also use the ipv6 enable command to enable IPv6 on the 
interface without setting an address.
Link-local, multicast, IPv4-compatible, and IPv4-mapped 
addresses are not allowed to be configured.
Include the EUI-64 keyword to have the system add the 64-
bit interface ID to the address. You must use a network prefix 
length of 64 in this case.
For VLAN interfaces, use the dhcp keyword to enable the 
DHCPv6 client and obtain an IP address form a network 
DHCPv6 server.
ipv6 mtu 
size
(VLAN interfaces only) Set the IPv6 Maximum 
Transmission Unit (MTU) on a routing interface. The IPv6 
MTU is the size of the largest IPv6 packet that can be 
transmitted on the interface without fragmentation. The 
range is 1280–1500 bytes.
ipv6 traffic-filter 
ACL 
name
Add an access-list filter to this interface.
ipv6 unreachables  (VLAN interfaces only) Allow the interface to send ICMPv6 
Destination Unreachable messages. The no ipv6 
unreachables command suppresses the ICMPv6 unreachable 
messages for this interface.
exit Exit the interface configuration mode.