| 摘要 |
The present invention relates to a lookup device and a method for classification and forwarding of packets in packet-switched networks, wherein each packet comprises a packet header comprising a number of fields, wherein several fields in the packet header together form a packet identifier. The lookup device (30) comprises n parallel hashing units (321, 322, ... 32n), wherein n is an integer and n>/=2, for computing, for each packet, a first index by hashing the packet identifier, and in dependence of the first index either directly or indirectly obtaining a packet identifier and forwarding information for the destination for said packet from one of at least n memories . The n hashing units (321, 322, ... 32n) are processing the same packet identifier at a time. The lookup device (30) also comprises a comparator (42) connected either directly or indirectly to at least one of said memories and to an input to said n hashing units (321, 322, ... 32n) for comparing the packet identifier input to the n hashing (321, 322, ... 32n) and the packet identifier output from said memory. When the compared packet identifiers match, the forwarding information for the packet is obtained from said memory. |
