Patent ID: 9413661
Filing Date: 2016-08-09
CPC Classification: H04L

Claim Text:
1. A network relay device comprising: a plurality of ports; an address table having a plurality of entries; and a frame processing unit which relays a frame to/from the plurality of ports based on the address table, wherein each of the plurality of entries includes: a first area in which first information is registered, the first information indicating a relation between the plurality of ports and MAC addresses existing beyond the plurality of ports; and a second area in which second information, indicating a collision history of a hash value in an entry in the address table, is registered, and in learning a transmission-source MAC address of a frame received at any of the plurality of ports, the frame processing unit calculates the hash value by using the transmission-source MAC address, and registers the second information in the second area if a MAC address different from the transmission-source MAC address has been registered in the first area of an entry corresponding to the hash value, the network relay device further comprising a managing unit which reads the second area of each of the plurality of entries in accordance with a request from a user, extracts an entry having the second region in which the second information is registered, and notifies the user of the extracted entry; and the managing unit further calculates a ratio of entries having the second area in which the second information is registered from among the plurality of entries in accordance with a request from a user, and notifies the user of the calculated ratio.