Forwarding data path optimization in a distributed environment for achieving micro-mobility

• US 20090103490A1
• Filed: 10/19/2007
• Published: 04/23/2009
• Est. Priority Date: 10/19/2007
• Status: Active Grant

• Current Assignee: Ericsson AB (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Redback Networks Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Baruah, Pritam, Lakshmikanthan, Ramanathan
• Granted Patent: US 7,986,667 B2
• Time in Patent Office: Days
• US Class Current: 370/331
• CPC Class Codes: H04L 12/4633 Interconnection of networks using encapsulation techniques, e.g. tunneling

Abstract

A method and apparatus of updating a forwarding plane of a network element in response to receiving a mobility event is described. The network element receives a mobility message indicating a mobile node has coupled to a new access port associated with the network element. The message further indicates that the mobile node moved from an old access port to a new access port. The network element adds an entry in a forwarding table of the old egress engine to redirect a set of packets destined to the mobile node to a new egress engine, where the new egress engine is associated with the new access port. Furthermore, the network element redirects the set of packet from the old egress engine to the new egress engine.

Claims

1. A computerized method, comprising:

receiving a mobility message by a network element indicating a mobile node has coupled to a new access port, wherein the mobility message further indicates that the mobile node moved from an old access port to the new access port, and wherein the network element comprises the old and new access port;

adding an entry in a forwarding table associated with an old egress engine to redirect a set of packets destined to the mobile node to a new egress engine, wherein the new egress engine is associated with the new access port; and

forwarding the set of packets to the mobile node from the old egress engine via the new egress engine.

2. The computerized method of claim 1, further comprising:

receiving the set of packets at one or more ingress engines; and

forwarding the set of packets to the old egress engine from the one or more ingress engines.

3. The computerized method of claim 1, wherein the forwarding is based on a special egress key associated with the new egress engine, wherein the special egress key indicates encapsulation and process information associated with the new access port.

4. The computerized method of claim 3, further comprising:

creating the special egress key based on information associated with the new access port.

5. The computerized method of claim 1, wherein receiving the mobility message is received at a new ingress engine associated with the new access port.

6. The computerized method of claim 5, further comprising:

sending a forwarding message to the old egress engine, wherein the forwarding message indicates to forward the set of packets to the new egress engine.

7. A machine-readable medium that stores instructions, which when executed by a set of one or more processors, cause said set of processors to perform operations comprising:

receive a mobility message by a network element indicating a mobile node has coupled to a new access port, wherein the mobility message further indicates that the mobile node moved from an old access port to the new access port, and wherein the network element comprises the old and new access port;

add an entry in a forwarding table associated with an old egress engine to redirect a set of packets destined to the mobile node to a new egress engine, wherein the new egress engine is associated with the new access port; and

forward the set of packets to the mobile node from the old egress engine via the new egress engine.

8. The machine-readable medium of claim 7, further comprising:

receive the set of packets at one or more ingress engines; and

forward the set of packets to the old egress engine from the one or more ingress engines.

9. The machine-readable medium of claim 7, wherein the forwarding is based on a special egress key associated with the new egress engine, wherein the special egress key indicates encapsulation and process information associated with the new access port.

10. The machine-readable medium of claim 9, further comprising:

create the special egress key based on information associated with the new access port.

11. The machine-readable medium of claim 7, wherein receive a message is received at a new ingress engine associated with the new access port.

12. The machine-readable medium of claim 11, further comprising:

send a forwarding message to the old egress engine, wherein the forwarding message indicates to forward the set of packets to the new egress engine.

13. A network comprising:

a mobile node; and

a network element comprising;

a plurality of access ports,

a set of one or more ingress engines, wherein one of the set of one or more ingress engines receives a mobility message indicating the mobile node has coupled to a new one of the plurality of access ports, wherein the mobility message further indicates that the mobile node moved from an old one of the plurality of access ports to the new access port, and

a plurality of egress engines, wherein one of the plurality of egress engines that is associated with the old one of the plurality of access ports adds an entry in a forwarding table to redirect a set of packets destined to the mobile node to the new one of the plurality of egress engines, wherein the new one of the plurality of egress engines is associated with the new one of the plurality of access ports, and wherein the old one of the plurality of egress engines forwards the set of packets to the mobile node via the new one of the plurality of egress engines.

14. The network of claim 13, wherein at least one of the set of one or more ingress engines receives the set of packets and the at least one of the set of one or more ingress engines forwards the set of packets to the old one of the plurality of egress engines.

15. The network of claim 13, wherein the forwarding is based on a special egress key associated with the new one of the plurality of egress engines, wherein the special egress key indicates encapsulation and process information associated with the new one of the plurality of the access ports.

16. The network of claim 15, wherein the network element creates the special egress key based on information associated with the new one of the plurality of access ports.

17. The network of claim 13, wherein a new one of the set of one or more of ingress engines associated with the new one of the plurality of access ports receives the mobility message.

18. The network of claim 17, wherein the new one of the set of one or more of ingress engines sends a forwarding message to the old one of the plurality of egress engines, wherein the forwarding message indicates to redirect the set of packets to the new one of the plurality of egress engines.

19. An apparatus comprising:

means for receiving a mobility message indicating a mobile node has coupled to a new access port, wherein the mobility message further indicates that the mobile node moved from an old access port to the new access port, and wherein the network element comprises the old and new access port;

means for adding an entry in a forwarding table associated with an old egress engine to redirect a set of packets destined to the mobile node to a new egress engine, wherein the new egress engine is associated with the new access port; and

means for forwarding the set of packets to the mobile node from the old egress engine via the new egress engine.

20. The apparatus of claim 19, further comprising:

means for receiving the set of packets at one or more ingress engines; and

means for forwarding the set of packets to the old egress engine from the one or more ingress engines.