Patent ID: 8988988
Filing Date: 2015-03-24
Classification: H04L

Abstract:
1. A communication control method which is executed in a system including a first communication apparatus and a second communication apparatus connected through a third communication apparatus and a plurality of information processing apparatuses each connected to both of the first communication apparatus and the second communication apparatus, the communication control method comprising: outputting frames from the plurality of information processing apparatuses to the first communication apparatus for communication; when a failure in a link between the first communication apparatus and a first one of the plurality of information processing apparatuses is detected, switching a forwarding direction of first frames containing tag information and being outputted from the first one of the plurality of information processing apparatuses, from a first direction toward the first communication apparatus to a second direction toward the second communication apparatus, the first one of the plurality of information processing apparatuses using a first address; searching for a second one of the plurality of information processing apparatuses which uses the tag information in common with the first one of the plurality of information processing apparatuses, the second one of the plurality of information processing apparatuses using a second address different from the first address; and switching a forwarding direction of second frames containing the tag information used in common with the first one of the plurality of information processing apparatuses and being outputted from the second one of the plurality of information processing apparatuses, from a third direction toward the first communication apparatus to a fourth direction toward the second communication apparatus, wherein in the case where the forwarding direction of the second frames containing the tag information used in common with the first one of the plurality of information processing apparatuses and being outputted from the second one of the plurality of information processing apparatuses cannot be switched to the fourth direction toward the second communication apparatus, the first communication apparatus converts the tag information contained in the second frames outputted from the second one of the plurality of information processing apparatuses to other tag information and transfers the second frames containing the other tag information to the third communication apparatus, and the second communication apparatus converts the tag information contained in the first frames outputted from the first one of the plurality of information processing apparatuses to the other tag information and transfers the first frames containing the other tag information to the third communication apparatus.