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Configuring an IPv6 link-local address
About IPv6 link-local address
Configure IPv6 link-local addresses using one of the following methods:
• Automatic generation—The device automatically generates a link-local address for an
interface according to the link-local address prefix (FE80::/10) and the link-layer address of the
interface.
• Manual assignment—Manually configure an IPv6 link-local address for an interface.
Restrictions and guidelines
After you configure an IPv6 global unicast address for an interface, the interface automatically
generates a link-local address. This link-local address is the same as the one generated by using the
ipv6 address auto link-local command. If a link-local address is manually assigned to an
interface, this manual assigned link-local address takes effect. If the manually assigned link-local
address is deleted, the automatically generated link-local address takes effect.
Using the
undo ipv6 address auto link-local command on an interface deletes only the
link-local address generated by the
ipv6 address auto link-local command. If the interface
has an IPv6 global unicast address, it still has a link-local address. If the interface has no IPv6 global
unicast address, it has no link-local address.
An interface can have only one link-local address. As a best practice, use the automatic generation
method to avoid link-local address conflicts. If both the automatic generation and manual assignment
methods are used, the manual assignment takes precedence.
• If you first use automatic generation and then manual assignment, the manually assigned
link-local address overwrites the automatically generated one.
• If you first use manual assignment and then automatic generation, both of the following occur:
{ The link-local address is still the manually assigned one.
{ The automatically generated link-local address does not take effect. If you delete the
manually assigned address, the automatically generated link-local address takes effect.
Configuring automatic generation of an IPv6 link-local
address for an interface
1. Enter system view.
system-view
2. Enter interface view.
interface interface-type interface-number
3. Configure the interface to automatically generate an IPv6 link-local address.
ipv6 address auto link-local
By default, no link-local address is configured on an interface.
After an IPv6 global unicast address is configured on the interface, a link-local address is
generated automatically.
Manually assigning an IPv6 link-local address to an interface
1. Enter system view.
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