Method for creating a dynamic address table for a switching nde in a data network and a method for transmitting a data message

• US 20040246963A1
• Filed: 03/16/2004
• Published: 12/09/2004
• Est. Priority Date: 09/26/2001
• Status: Active Grant

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Klotz, Dieter, Bruckner, Dieter, Schimmer, Jurgen, Gotz, Franz-Josef
• Granted Patent: US 7,916,738 B2
• Time in Patent Office: Days
• US Class Current: 370/392
• CPC Class Codes: H04L 12/462 LAN interconnection over a bridge based backbone
• CPC Class Codes: H04L 45/742 Route cache; Operation thereof
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers

Abstract

The invention relates to a switching node comprising a dynamic address table in a data network, in addition to a method for creating a dynamic address table of this type for a switching node. The method comprises the following steps: receipt of a first data message with a source address at a port of the switching node; entry of the source address, details of the port and a counter initial value in a line of the address table that is assigned to the source address as the target address, whereby the current counter value indicates the validity of the entry and the current counter value is modified, if a second data message with the source address as the target address is received and the entry is valid.

Claims

1-12. -12. (canceled)

13. A method for creating a dynamic address table for a switching node in a data network, comprising:

receiving a first data message with a source address at a port of the switching node; and

entering data in a line of the address table that is assigned to the source address as the target address, the data comprising;

(1) the source address, (2) details of the port, and, (3) a counter initial value,

whereby the current counter value indicates the validity of the entry and the current counter value is modified if a second data message with the source address as the target address is received and the entry is valid.

14. The method according to claim 13, wherein the current counter value is reset to the counter initial value if a third data message with the source address is received at the port.

15. The method according to claim 13, wherein the current counter value is incremented upon each receipt of the second data message if the second data message is received with the source address as the target address and the entry is valid.

16. The method according to claim 13, wherein the current counter value is decremented upon each receipt of the second data message if the second data message is received with the source address as the target address and the entry is valid.

17. The method according to claim 13, wherein the source address and the target address are in each case unicast addresses.

20. The method as claimed in claim 13, wherein the switching node is used for a data network and is adapted to create a dynamic address table.

23. The method according to claim 13, wherein the method is implemented in a computer programming product for creating a dynamic address table.

18. A method for transmitting a data message with a target address via a switching node of a data network, comprising:

receiving the data message by the switching node;

accessing a line of an address table assigned to the target address of the data message;

checking by the current counter value whether the entry in the line is valid; and

forwarding the data message to a port specified in the line, if the entry is valid.

19. The method according to claim 18, wherein the data message is forwarded from the switching node as a broadcast data message if the entry is not valid.

21. The method as claimed in claim 18, wherein the switching node is adapted to transmit a data message.

22. The method as claimed in claim 18, wherein the data network further comprises the switching node.

24. The method according to claim 18, wherein the method is implemented in a computer programming product for transmitting a data message.