Patent ID: 8489913
Filing Date: 2013-07-16
Classification: G06F,H04L

Abstract:
1. A network system, comprising: a first processing apparatus configured to provide a specific service; a second processing apparatus configured to provide the specific service, the first processing apparatus and the second processing apparatus having one identical address; a client apparatus configured to utilize the specific service; a network relay apparatus connected directly or indirectly via interfaces to the first processing apparatus, the second processing apparatus, and the client apparatus, configured to relay packet transmission between the client apparatus and the first processing apparatus or the second processing apparatus, and configured to forward a received packet, which is received via the interface connecting with the client apparatus to be sent to the address as a destination, to one processing apparatus in a state enabled to provide the specific service between the first processing apparatus and the second processing apparatus; wherein the network relay apparatus includes: a VRF definition information storage configured to store VRF definition information that defines belonginqness of each of the first processing apparatus, the second processing apparatus, and the client apparatus, to either of a first virtual network and a second virtual network; a status monitor configured to monitor a status of at least one of the first processing apparatus and the second processing apparatus specified as a monitor object apparatus, and to detect a state of the monitor object apparatus; and a failover processor configured to update the belongingness of the client apparatus to either of the first virtual network and the second virtual network in the VRF definition information, based on the detected state of the monitor object apparatus, a packet forwarding processor configured to, on detection of the packet, specify a virtual network to which a source apparatus of the packet belongs, by referring to the VRF definition information.