Flow identifying device, flow processing device, flow identifying method, and flow processing method

摘要

The flow identification device includes a retrieval flag table 3, a mask section 4, and a flow retrieval table 5 formed of a content-addressable memory (CAM). The retrieval flag table 3 stores a retrieval flag which sets a field to be retrieved among fields in the header of a received IP packet and an input logical link number corresponding thereto and outputs a flag corresponding to an extracted input logical link number. The mask section 4 masks each field in the header of a received IP packet with the retrieval flag and creates a post-mask retrieval key. The flow retrieval table 5 stores a post-mask retrieval key and a flow retrieval in a correspondence relationship and outputs a flow retrieval corresponding to the post-mask retrieval key output from the mask section.