Patent ID: 11936490
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. The first L2 switch according to claim 2, further comprising:
a session information generating unit, including the one or more computing devices, configured to generate session information of the upstream communication in which (i) a port of the first L2 switch used to receive the copy of the upstream communication (ii) the transmission source MAC address included in the copy of the upstream communication are associated with header information set for the copy of the upstream communication received from the second L2 switch,
wherein, in a case in which the failure determining unit determines that the failure has occurred in the second L2 switch, upon receiving the downstream communication corresponding to the upstream communication, the transferring unit is configured to transfer the downstream communication to the second L2 switch, using the port and the transmission source MAC address indicated by the generated session information of the upstream communication.