Communication relay apparatus, active system switching method, and communication relay control board

摘要

A communication relay apparatus in which when an operation state of a first board is an active system and a fault in the first board is detected, a first transmission control circuit gives an instruction to an IF unit as to whether usage of a first transmission path is allowed and notifies a second transmission control circuit and a first communication state control unit that the fault is detected, the second transmission control circuit gives an instruction to the IF unit as to whether usage of a second transmission path is allowed, and when an evaluation is made to switch the operation state of the first board to the standby system, the first communication state control unit starts to take over the communication state of the communication data, which has passed through the first transmission path, to the second communication state control unit.

主权项

1. A communication relay apparatus, comprising:
an interface (IF) unit that externally transmits and receives communication data; a first board that comprises:
a first transmission control circuit that is connected to the IF unit by a first transmission path and controls usage of the first transmission path by the IF unit; anda first communication state control unit that manages a communication state of the communication data that has passed through the first transmission path; and a second board that is mounted as a redundant board of the first board and comprises:
a second transmission control circuit that is connected to the IF unit by a second transmission path and controls usage of the second transmission path by the IF unit; anda second communication state control unit that manages a communication state of the communication data that has passed through the second transmission path, wherein, when an operation state of the first board is an active system and the first transmission control circuit detects a fault in the first board, the first transmission control circuit gives an instruction to the IF unit as to whether or not the usage of the first transmission path is allowed and notifies the second transmission control circuit and the first communication state control unit that the fault is detected, wherein, in response to a notification from the first transmission control circuit, the second transmission control circuit gives an instruction to the IF unit as to whether or not the usage of the second transmission path is allowed, wherein, the first communication state control unit evaluates as to whether or not to switch the operation state of the first board to a standby system, and wherein, when an evaluation is made to switch the operation state of the first board to the standby system, the first communication state control unit starts to take over the communication state of the communication data, which has passed through the first transmission path, to the second communication state control unit.