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

• US 7,916,738 B2
• Filed: 09/13/2002
• Issued: 03/29/2011
• Est. Priority Date: 09/26/2001
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Götz, Franz-Josef, Brückner, Dieter, Schimmer, Jürgen, Klotz, Dieter
• Primary Examiner(s): Sheikh; Ayaz R
• Assistant Examiner(s): Lee; Andrew C
• Application Number:
  US10/489,764
• Publication Number:
  US 20040246963A1
• Time in Patent Office: 3,119 Days
• Field of Search: 370/412, 370/413, 370/466, 370/402, 370/241, 370/255, 370/258, 370/353, 370/389, 370/392, 370/401, 709/220, 709/227, 709/229, 709/238, 709/245, 709/311
• US Class Current: 370/401
• 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. A method for creating a dynamic address table for a multi-port switching node in a data network for a plurality of data messages each having a target address, comprising the steps of:

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

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

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

wherein the counter value is adjustable toward a predetermined value based on receipt of one or more data messages having the source address of the first data message as the target address, wherein the predetermined value is determinative as to whether the source address is no longer valid as the target address such that a current counter value indicates whether an entry is valid, and the current counter value is adjusted to the initial value if the entry is no longer valid.

2. The method according to claim 1, 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.

3. The method according to claim 1, wherein the current counter value is incremented upon each receipt of a subsequent data message having the source address as the target address and the entry is valid.

4. The method according to claim 1, wherein the current counter value is decremented upon each receipt of a subsequent data message having the source address as the target address and the entry is valid.

5. The method according to claim 1, wherein the source address and the target address are in each case unicast addresses.

6. The method as claimed in claim 1, wherein the switching node is used for a data network and to create a dynamic address table.

7. The method according to claim 1, further including the step of implementing the steps of claim 1 in a computer programming product for creating a dynamic address table.

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

providing a counter with an initial value assigned as a counter value, the counter value adjustable toward a predetermined value based on receipt by the switching node of the data message having the target address, wherein the predetermined value is determinative as to whether the counter value is no longer valid;

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 an entry of a current counter value to determine 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; and

adjusting the current counter value based on receipt of the data message if the value is valid and setting the counter value to the initial value if the current value is not valid.

9. The method according to claim 8, wherein the data message is forwarded from the switching node as a broadcast data message if the entry is not valid.

10. The method as claimed in claim 8, wherein the switching node transmits a data message.

11. The method as claimed in claim 8, wherein the data network further comprises the switching node.

12. The method according to claim 8, further including the step of implementing the steps of claim 8 in a computer programming product for transmitting a data message.