| 摘要 |
A service interruption time is shortened in redundancy switching, thereby to render a vocal service of good quality, in addition to a data service of good quality by a server. In case of redundancy switching, an IP filter is set in a standby system server, and the standby system server is given the same IP address as an IP address given to an operation system server and is thereafter shifted into an operating state. On the other hand, the original operation system server deletes the given IP address and is thereafter shifted from an operating state into a standby state. The original standby system server releases the set IP filter, and thereafter starts the provision of a service.
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