Reference Guide

The no ipv6 address autoconfig command disables IPv6 global address autoconguration, and sets the interface to Router mode
with IPv6 forwarding enabled.
DHCP-assigned addresses
As an alternative to stateless autoconguration, you can enable a network host to obtain IPv6 addresses using a DHCP server via stateful
autoconguration using the
ipv6 address dhcp command. A DHCPv6 server uses a prex pool to congure a network address on an
interface. The interface ID is automatically generated.
Manally congured addresses
An interface can have multiple IPv6 addresses. To congure an IPv6 address in addition to the link-local address, use the ipv6 address
ipv6-address/mask command. Enter the full 128-bit IPv6 address, including the network prex and a 64-bit interface ID.
You can also manually congure an IPv6 address by assigning:
• A network prex with the EUI-64 parameter using the ipv6 address ipv6-prefix eui64 command. A 64-bit interface ID is
automatically generated based on the MAC address.
• A link-local address to use instead of the link-local address that is automatically congured when you enable IPv6 using the ipv6
address link-local command.
Congure IPv6 address
OS10(config)# interface ethernet 1/1/8
OS10(conf-if-eth1/1/8)# ipv6 address 2001:dddd:0eee::4/64
Congure network prex
OS10(config)# interface ethernet 1/1/8
OS10(conf-if-eth1/1/8)# ipv6 address 2001:FF21:1:1::/64 eui64
Congure link-local address
OS10(config)# interface ethernet 1/1/8
OS10(conf-if-eth1/1/8)# ipv6 address FE80::1/64 link-local
Stateless autoconguration
When an interface comes up, OS10 uses stateless autoconguration to generate a unique link-local IPv6 address with a FE80::/64 prex
and an interface ID generated from the MAC address. To use stateless autoconguration to assign a globally unique address using a prex
received in router advertisements, enter the
ipv6 address autoconfig command.
Stateless autoconguration sets an interface in host mode, and allows the interface connected to an IPv6 network to autocongure IPv6
addresses and communicate with other IPv6 devices on local links. A DHCP server is not required for automatic IPv6 interface
conguration. IPv6 devices on a local link send router advertisement (RA) messages in response to solicitation messages received at
startup.
Stateless autoconguration of IPv6 addresses is performed using:
Prex
advertisement Routers use router advertisement messages to advertise the network prex. Hosts append their interface-identier
MAC address to generate a valid IPv6 address.
Duplicate address
detection
An IPv6 host node checks whether that address is used anywhere on the network using this mechanism before
conguring its IPv6 address.
Prex renumbering Transparent renumbering of hosts in the network when an organization changes its service provider.
IPv6 provides the exibility to add prexes on router advertisements in response to a router solicitation (RS). By default, RA response
messages are sent when an RS message is received. The system manipulation of IPv6 stateless autoconguration supports the router side
Layer 3
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