H3C Technologies H3C S5560 Series Switches - Manual (Page 164)

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An interface can have only one link-local address. To avoid link-local address conflicts, use the automatic
generation method.
Manual assignment takes precedence over automatic generation.
• 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 automatically generated link-local address does not take effect.
{
The link-local address is still the manually assigned one.
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
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
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 specifying an IPv6 link-local address for an interface
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Manually specify an IPv6
link-local address for the
interface.
ipv6 address ipv6-address
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.
After you configure an IPv6 global unicast address for an interface, the interface automatically generates
a link-local address. The automatically generated 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 link-local address takes effect. If the manually assigned link-local address is
removed, the automatically generated link-local address takes effect.
Using the undo ipv6 address auto link-local command on an interface only removes 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.