Configuring a Link-Local Address for an Interface

Prerequisites

IPv6 is enabled in the interface view.

Context

IPv6 addresses must be configured for routing device interfaces so that the routing devices can communicate with IPv6 devices.

Link-local addresses are used in neighbor discovery (ND) and in the communication between nodes on the local link during stateless address autoconfiguration. The packets with link-local addresses as source or destination addresses are forwarded only on the local link.

Link-local addresses can be automatically generated or manually configured.

After IPv6 is enabled on an interface, the system automatically generates a link-local address for the interface.
The link-local address that is manually configured must be valid (usually with the FE80::/10 prefix).

Link-local addresses are usually used for protocol communication between link-local nodes, meaning that these addresses are not directly related to the communication between users. Therefore, automatic generation of link-local addresses is recommended.

Procedure

Enter the interface view.

interface interface-type interface-number

Perform either of the following operations as required:
- Configure the device to automatically generate a link-local address for the interface.
```
ipv6 address auto link-local
```
- Manually configure a link-local address for the interface.
```
ipv6 address ipv6-address link-local
```
Only a single link-local address can be configured on an interface. If you configure multiple link-local addresses on the same interface, only the last configuration takes effect.
Exit the interface view.
```
quit
```