Method for data transfer through a bridge to a network requiring source route information

Claim 3

A method as in claim 1 additionally comprising the step of: (d) maintaining an address table (14,140,141) which includes the addresses for stations (51,55-60) on the first network (61) and which includes addresses and route information (74) of stations (31-54) on the second network (21,22,23,24,25) for which stations (31-54) on the second network (21,22,23,24,25) for which route information (74) is known by the bridge (51).

Claim 4

A method as in claim 2 additionally comprising the step of: (e) receiving a second data frame (71) from the second network (21,22,23,24,25), the second data frame (71) having a second destination address (72) and a source address (73); and, (f) when the bridge (51) is referenced in the second route information (74), performing the following substeps: (f1) removing route information (74) from the second data frame (71) to create a second modified data frame, and (f2) sending the second modified data frame out on the first network (61), and (f3) when the source address (73) is not in the address table (14,140,141) creating an entry in the address table (14,140,141) which includes the source address (73) and route information (74) derived from the route information (74) in the second data frame (71).

Claim 5

A method as in claim 2 additionally comprising: (e) maintaining an address cache (11) in which is stored an address for every entry in the address table (14,140,141).

Claim 6

A method as in claim 1 wherein step (c) additionally includes discarding the first data frame (81) when the first destination address (72) addresses a station (31-54) on the second network (21,22,23,24,25) and the bridge (51) does not have route information (74) to the station (31-54) on the second network (21,22,23,24,25).

Claim 7

A bridge (51) between a first network (61) which does not require route information within data frames (71,81) and a second network (21,22,23,24,25) requiring route information (74) within data frames (71,81), the bridge (51) comprising: a first memory (3) which receives data frames (71,81) from the first network (61) and from the second network (21,22,23,24,25), the data frames (71,81) each having a destination address (72,82); a system processor (9), coupled to the first memory (3), the system processor (9) monitoring data frames (71,81) received by the first memory (3); and, a system memory (12), coupled to the system processor (9), the system memory (12) including an address table (14,140,141), the address table (14,140,141) including a plurality of entries, each entry being for a single station (31-60) and each entry including a first field (17,170,171) containing an address of the station (31-60), and when the station (31-60) is in the second network (21,22,23,24,25) the entry includes a second field (19,191) which contains a route to the station (31-60); wherein when the first memory (3) receives from the first network (61) a first data frame (81) having a first destination address (72), the system processor (9) searches the address table (14,140,141) for the first destination address (72), the system processor (9) adding first route information (74) to the first data frame (81) to form a first modified data frame and sending the first modified data frame out on the second network (21,22,23,24,25) when the system processor (9) finds a second entry in the address table (14,140,141), the second entry including the first destination address (72) in a first field (17,170,171) of the second entry, and the first destination address (72) being address of a station (31-54) on the second network (21,22,23,24,25), and the system processor (9) initiating a route discovery process to a station (31-54) on the second network (21,22,23,24,25) with the first destination address (72) when no entry in the address table (14,140,141) contains the first destination address (72).

Claim 8

A bridge (51) between a first network (61) which does not require route information within data frames (71,81) and a second network (21,22,23,24,25) requiring route information (74) within data frames (71,81), the bridge (51) comprising: a first memory (3) which receives data frames (71,81) from the first network (61) and from the second network (21,22,23,24,25), the data frames (71,81) each having a destination address (72,82); a system processor (9), coupled to the first memory (3), the system processor (9) monitoring data frames (71,81) received by the first memory (3); and, a system memory (12), coupled to the system processor (9), the system memory (12) including an address table (14,140,141), the address table (14,140,141) including a plurality of entries, each entry being for a single station (31-60) and each entry including a first field (17,170,171) containing an address of the station (31-60), and when the station (31-60) is in the second network (21,22,23,24,25) the entry includes a second field (19,191) which contains a route to the station (31-60); wherein when the first memory (3) receives from the first network (61) a first data frame (81) having a first destination address (72), the system processor (9) searches the address table (14,140,141) for the first destination address (72), the system processor (9) adding first route information (74) to the first data frame (81) to form a first modified data frame and sending the first modified data frame out on the second network (21,22,23,24,25) when the system processor (9) finds a second entry in the address table (14,140,141), the second entry including the first destination address (72) in a first field (17,170,171) of the second entry, and the first destination address (72) being address of a station (31-54) on the second network (21,22,23,24,25), and the system processor (9) initiating a route discovery process to a station (31-54) on the second network (21,22,23,24,25) with the first destination address (72) when no entry in the address table (14,140,141) contains the first destination address (72).

Claim 9

A bridge (51) as in claim 6 wherein when the first memory (3) receives from the second network (21,22,23,24,25) a second data frame (71) having second route information (74) and a source address (73), the system processor (9) searches the second route information to determine whether the bridge (51) is in the second route information (74), the system processor (9) removing the second route information (74) from the second data frame (71) to form a second modified data frame and sending the second modified data frame out on the first network (61) when the system processor (9) determines the bridge (51) is referenced in the second route information (74), and the system processor (9) adding a third entry to the address table (14,140,141), the third entry having the source address in a first field (17,170,171) address, and a second field (19,191) having route information (74) derived from the second route information (74) when the second destination address (72) is the address of a station (51,55-60) on the first network (61) and no entry in the address table (14,140,141) contains the the source address.

Claim 10

A bridge (51) as in claim 6 additionally comprising an address cache (11), coupled to the system processor (9), the address cache (11) containing at least a portion of addresses contained in the first field (17,170,171) of entries in the address table (14,140,141).

Claim 11

A bridge (51) as in claim 6 wherein the system processor (9) discards the first data frame (81) when the system processor (9) finds a first entry in the address table (14,140,141) which includes the first destination address (72), the first destination address (72) being the address of a station (51,55-60) on the first network (61).

Claim 12

A bridge (51) as in claim 6, each entry in the address table (14,140,141) including a third field (18) indicating in which of the first network (61) and the second network (21,22,23,24,25) a station (31-60) listed in the first field (17,170,171) of the entry resides.

Claim 13

A bridge (51) as in claim 6 wherein when the first memory (3) receives from the second network (21,22,23,24,25) a second data frame (71) having second route information (74), a second destination address (72) and a source address (73), the system processor (9) searches the second route information (74) to determine whether the second data frame (71) is an explorer message of the all routes type and searches the address table (14,140,141) to determine on which network (21,22,23,24,25,61) a station (31-60) with the second destination address (72) resides, the system processor (9) discarding the second data frame (71) when both the second data frame (71) is an explorer message of the all routes type and the second destination address (72) addresses a station (31-54) on the second network (61).

Claim 16

A method as in claim 12 additionally comprising the steps of: (d) receiving a second data frame (71) from the second network (21,22,23,24,25), the second data frame (71) having second routing information (74) and a source address (73); (e) when the bridge (51) is in the second route information (74), performing the following substeps: (e1) removing the second route information (74) from the second data frame (71) to create a second modified data frame, and (e2) sending the second modified data frame out on the first network (61), and (e3) when the source address (73) is not in the address table (14,140,141) recording in a memory the route information (74) derived from the second route information (74) in the second data frame (71).