Symptom:
Automatic stateless address configuration for IPv6 may not operate instantly when activating IPv6. As a consequence, it takes time to add site-local/global addresses.
Corrective action:
When activating an interface for IPv6, a link-local address is added to the physical interface to activate the physical interface. To instantly create site-local/global address by the automatic stateless address configuration, it transmits the "router solicitation message" to the adjacent router to request for router advertisement message from the router. However, once the interface activates, if spanning tree protocol (STP) is running on the HUB, it takes time to hold a communication. Thus it may fail to request router advertisement messages.
Because IPv6 router transmits the router advertisement message periodically and automatic stateless address configuration runs after certain amount of time, it is possible to hold a communication of site-local/global addresses. Nevertheless, if the time interval parameter of transmitting the router advertisement message is set for a considerably long time, it may consume a long time until the automatic stateless address configuration starts and to hold a communication.
In such case, either establish a link for operating NIC and standby NIC or modify the router setting so that a router transmits the router advertisement message within a fewer minutes interval.
