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

Claim 5:
6. The non-transitory recording medium according to claim 5, wherein the operations further comprise:
determining whether or not a failure has occurred in the second L2 switch,
wherein, based on determining that the failure has occurred in the second L2 switch:
specifying a second network apparatus serving as a second transmission source of the upstream communication, and
specifying (i) a second port of the first L2 switch connected to the second specified network apparatus serving as the second transmission source of the upstream communication and (ii) a second MAC address of the second transmission source of the upstream communication connected via the second specified port, and
storing, in the storage unit, session information of the upstream communication in which information regarding the second specified port and the second specified MAC address is associated with header information set for the copy of the upstream communication, in the storage unit.