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

Claim 6:
7. The non-transitory recording medium according to claim 6, wherein the operations further comprise:
generating 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 and (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, based on determining that the failure has occurred in the second L2 switch, upon receiving the downstream communication corresponding to the upstream communication, transferring 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.