The ipv6 address auto global command enables a device to generate an IPv6 global address through stateless autoconfiguration.
The undo ipv6 address auto global command disables a device from generating an IPv6 global address through stateless autoconfiguration.
By default, the device is disabled from generating an IPv6 global address through stateless autoconfiguration.
| Parameter | Description | Value |
|---|---|---|
| default | Indicates that the device learns the default route. |
- |
Usage Scenario
After the ipv6 address auto global command is run, a device automatically generates an IPv6 global unicast address on the interface that receives a RA packet. The generated IPv6 address contains the address prefix in the received RA packet and interface identifier of the device. If the device does not receive RA packets, the device can only automatically configure a link-local address to interconnect with local nodes.
After the ipv6 address auto global default command is run, a device generates an IPv6 address based on the received RA packet and learns the source address in the RA packet. The device then uses the source IPv6 address as the next hop address of the default IPv6 route.
Prerequisites
The IPv6 function has been enabled on the interface using the ipv6 enable command in the interface view.
Precautions
After the ipv6 address auto global command is run, if an interface receives a new RA packet, a new IPv6 address is generated for the interface based on the received RA packet, but the default routes learned by the interface are not deleted.
If an interface has been configured with an IPv6 address, the original IPv6 address is not deleted after the interface receives an RA packet and generates a new IPv6 address. If the interface receives no RA packet and the generated IPv6 address expires, the interface deletes the generated IPv6 address and uses the original IPv6 address.
A device learns a maximum of three default routes based on RA packets. New routes cannot override the existing three routes, and extra routes will be discarded. If multiple default routes have the same priority, packets are forwarded in load balancing mode.
# Enable a device to generate an IPv6 global address through stateless autoconfiguration on VLANIF100.
<HUAWEI> system-view [HUAWEI] ipv6 [HUAWEI] interface vlanif 100 [HUAWEI-Vlanif100] ipv6 enable [HUAWEI-Vlanif100] ipv6 address auto global
# Enable a device to generate an IPv6 global address through stateless autoconfiguration on interface GE0/0/1.
<HUAWEI> system-view [HUAWEI] ipv6 [HUAWEI] interface gigabitethernet 0/0/1 [HUAWEI-GigabitEthernet0/0/1] undo portswitch [HUAWEI-GigabitEthernet0/0/1] ipv6 enable [HUAWEI-GigabitEthernet0/0/1] ipv6 address auto global