Network relay arrangements including: multiple ports; MAC address storage; flooding indication storage; plane number management storage; table manager; and frame processor. The table manager: utilizes the plane number management storage to specify current identification information being currently used and next identification information to be used next, with regard to a preset element of the key item for identifying a target of deletion of the information of correlating the transmit port to the MAC address from the MAC address storage; sets the requirement of the flooding operation in registry of a certain information group in the flooding indication storage having the preset element and being correlated to the current identification information; and sets the non-requirement of the flooding operation in registry of a certain information group in the flooding indication storage having the preset element and being correlated to the next identification information.