| 摘要 |
<p>The invention relates to a frame discard method for a packet switch and to a packet switch. The method comprises the steps of (a) receiving packets belonging to at least one transmission connection, consecutive packets of an individual transmission connection forming frames, (b) switching packets from N input ports of the switch to N output ports of the switch, through at least one intermediate port, and (c) discarding complete frames, if the load level in the switch exceeds a predetermined threshold. In order to combine a good frame level performance with implementation simplicity, the packets are discarded in a switch where the maximum number of packets that can be transmitted simultaneously to one port is smaller than N, in such a way that (i) when the number of packets simultaneously contending for an individual port exceeds said maximum number, at least one first packet of a frame is chosen to be discarded from among said packets, and (ii) once a first packet of a frame has been discarded, the remaining packets of the same frame are discarded, regardless of the current buffering capacity of the switch.</p> |
