Patent ID: 9019816
Filing Date: 2015-04-28
Classification: H04L

Abstract:
1. A communication system comprising: a first communication apparatus and a second communication apparatus, and a third communication apparatus and a fourth communication apparatus provided opposing to the first communication apparatus and the second communication apparatus with connected by logic line paths, wherein the first communication apparatus comprises: a notification unit adapted to use a second path connected to the fourth communication apparatus and to notify the fourth communication apparatus of state information indicating a state of a first path connected to the third communication apparatus, the third communication apparatus comprises: a notification unit adapted to use a third path connected to the fourth communication apparatus and to notify the second communication apparatus of state information indicating a state of the first path, the second communication apparatus and the fourth communication apparatus comprise: an exchanging unit adapted to use a fourth path connected between the second communication apparatus and the fourth communication apparatus and to exchange the state information notified from the first communication apparatus with the state information notified from the third communication apparatus; and a switching unit adapted to, when the state information notified from the first communication apparatus and the state information notified from the third communication apparatus are information indicating a failure state of the first path that is an active path and when the self apparatus is one responsible for a switching, switch the active path to a backup path that is the second path or the third path connected to the self apparatus.