Patent ID: 7894341

Claim:
A communications method in which data packets addressed to multiple destinations are transmitted via at least one multi-port switch from a source, the method comprising the steps of: (i) providing the or each switch with a data processing capacity; (ii) having each said switch on receipt of one of said data packets delete those addresses of said multiple destinations which are inaccessible thereby; (iii) maintaining a list of the corresponding port for each said one of those destinations to which the switch is directly connected and the corresponding port(s) of that or those destination(s) to which the switch is not directly connected; and (iv) having each said switch on receipt of one of said data packets addressed both to at least one destination to which the switch is directly connected and at least one destination to which said switch is indirectly connected, deliver said packet to the corresponding port of said directly connected destination(s) and delete the addresses of said directly connected destination(s) from said packet before delivering said one packet to the port(s) corresponding to that or those destination(s) to which said switch is not directly connected.