Method, system, and device for implementing service forwarding

• US 8,902,909 B2
• Filed: 05/24/2011
• Issued: 12/02/2014
• Est. Priority Date: 11/24/2008
• Status: Expired due to Fees

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Wang, Enfu
• Primary Examiner(s): Sam, Phirin
• Application Number:
  US13/114,712
• Publication Number:
  US 20110222847A1
• Time in Patent Office: 1,288 Days
• US Class Current: 370/401
• CPC Class Codes: H04L 45/04 Interdomain routing, e.g. hierarchical routing
• CPC Class Codes: H04L 45/50 using label swapping, e.g. multi-protocol label switch [MPLS]
• CPC Class Codes: H04Q 11/0062 Network aspects
• CPC Class Codes: H04Q 2011/0077 Labelling aspects, e.g. multiprotocol label switching [MPLS], G-MPLS, MPAS

Abstract

In the field of communications, a method, a system, and a device for implementing service forwarding are disclosed. The method includes: establishing an optical network tunnel between data communication devices; triggering physical interfaces of the data communication devices directly connected to an optical network to start a link layer protocol after the optical network tunnel is successfully established; performing, by the data communication devices, link layer negotiation through the optical network tunnel according to the link layer protocol; setting a link layer state between the data communication devices and a physical state of the physical interfaces to be valid after the link layer negotiation is performed successfully; and implementing, service forwarding, by the data communication devices through the optical network tunnel after the link layer state and the physical state of the physical interfaces are set to be valid. In this way, Internet Protocol (IP)/Multi-Protocol Label Switching (MPLS) service forwarding of the data communication devices is implemented, implementation complexity of bearing the IP/MPLS service over a Generalized Multi-Protocol Label Switching User-Network Interface (GMPLS UNI) tunnel is reduced, reconstruction on an IP/MPLS control plane and a forwarding plane is decreased, and forwarding performance is improved.

Claims

1. A method for implementing service forwarding, wherein at least two data communication devices communicate with each other through an optical network, the method comprising:

establishing an optical network tunnel between the data communication devices;

triggering physical interfaces directly connected to the optical network in the data communication devices to start a link layer protocol after the optical network tunnel is successfully established;

performing, by the data communication devices, link layer negotiation through the optical network tunnel according to the link layer protocol;

setting a link layer state between the data communication devices and a physical state of the physical interfaces to be valid after the link layer negotiation is successfully performed; and

implementing, by the data communication devices, service forwarding through the optical network tunnel after the link layer state and the physical state of the physical interfaces are set to be valid.

2. The method according to claim 1, wherein the performing, by the data communication devices, the link layer negotiation through the optical network tunnel according to the link layer protocol comprises:

sending, by a first data communication device, a link protocol request message through a physical interface of the first data communication device directly connected to the optical network;

transmitting the link protocol request message to a second data communication device through the optical network tunnel;

receiving, by the second data communication device, the link protocol request message through a physical interface of the second data communication device directly connected to the optical network, and sending a link protocol response message through the physical interface of the second data communication device directly connected to the optical network;

transmitting the link protocol response message to the first data communication device through the optical network tunnel; and

receiving, by the first data communication device, the link protocol response message through the physical interface of the first data communication device directly connected to the optical network.

3. The method according to claim 2, wherein the implementing, by the data communication devices, the service forwarding through the optical network tunnel comprises:

sending, by the first data communication device, a service to the optical network tunnel through the physical interface of the first data communication device, and transmitting the service to the second data communication device through the optical network tunnel; and

receiving, by the second data communication device, the service through the physical interface of the second data communication device directly connected to the optical network, wherein the second data communication device is a next hop data communication device of the first data communication device.

4. The method according to claim 2, further comprising:

setting the physical state of the physical interfaces to be invalid when the optical network tunnel becomes faulty.

5. The method according to claim 2, wherein the establishing of the optical network tunnel between the data communication devices comprises:

initiating, by the first data communication device, an optical network tunnel establishing request, to the optical network through the physical interface of the first data communication device directly connected to the optical network according to a user configuration and/or a service trigger, wherein the request carries information such as an identifier of the second data communication device, a bandwidth, and a Quality of Service (QoS) parameter;

receiving, by the optical network, the optical network tunnel establishing request, and establishing an optical path between the first data communication device and the second data communication device according to the information carried in the request; and

establishing, by the first data communication device, the optical network tunnel between the first data communication device and the second data communication device according to the optical path.

6. The method according to claim 2, wherein the link layer protocol comprises:

a Point-to-Point Protocol (PPP) or an Ethernet link layer protocol.

7. The method according to claim 2, wherein the service comprises:

a network protocol Internet Protocol (IP) service and/or a Multi-Protocol Label Switching (MPLS) service.

8. The method according to claim 1, wherein the implementing, by the data communication devices, the service forwarding through the optical network tunnel comprises:

sending, by the first data communication device, a service to the optical network tunnel through the physical interface of the first data communication device, and transmitting the service to the second data communication device through the optical network tunnel; and

receiving, by the second data communication device, the service through the physical interface of the second data communication device directly connected to the optical network, wherein the second data communication device is a next hop data communication device of the first data communication device.

9. The method according to claim 3, wherein before the sending, by the first data communication device, the service to the optical network tunnel through the physical interface of the first data communication device, the method further comprises:

receiving, by the first data communication device, the service sent by a previous hop data communication device of the first data communication device, wherein the previous hop data communication device knows that the physical state of the physical interface of the first data communication device is valid by searching a forwarding table of the previous hop data communication device, and sends the service to the first data communication device.

10. The method according to claim 1, further comprising:

setting the physical state of the physical interfaces to be invalid when the optical network tunnel becomes faulty.

11. The method according to claim 1, wherein the establishing of the optical network tunnel between the data communication devices comprises:

initiating, by the first data communication device, an optical network tunnel establishing request, to the optical network through the physical interface of the first data communication device directly connected to the optical network according to a user configuration and/or a service trigger, wherein the request carries information such as an identifier of the second data communication device, a bandwidth, and a Quality of Service (QoS) parameter;

receiving, by the optical network, the optical network tunnel establishing request, and establishing an optical path between the first data communication device and the second data communication device according to the information carried in the request; and

establishing, by the first data communication device, the optical network tunnel between the first data communication device and the second data communication device according to the optical path.

12. The method according to claim 1, wherein the link layer protocol comprises:

a Point-to-Point Protocol (PPP) or an Ethernet link layer protocol.

13. The method according to claim 1, wherein the service comprises:

a network protocol Internet Protocol (IP) service and/or a Multi-Protocol Label Switching (MPLS) service.

14. A system for implementing service forwarding, comprising:

a first data communication device and a second data communication device, wherein the first data communication device and the second data communication device communicate with each other through an optical network;

the first data communication device being configured to establish an optical network tunnel between the first data communication device and the second data communication device;

trigger a physical interface of the first data communication device directly connected to the optical network to start a link layer protocol after the optical network tunnel is successfully established;

perform link layer negotiation with the second data communication device through the optical network tunnel according to the link layer protocol;

set a link layer state and a physical state of the physical interface to be valid after the link layer negotiation is successfully performed; and

send a service to the optical network tunnel through the physical interface after the link layer state and the physical state of the physical interface are set to be valid; and

the second data communication device being configured to establish the optical network tunnel between the second data communication device and the first data communication device;

trigger a physical interface of the second data communication device directly connected to the optical network to start the link layer protocol after the optical network tunnel is successfully established;

perform the link layer negotiation with the first data communication device through the optical network tunnel according to the link layer protocol;

set the link layer state and the physical state of the physical interface of the second data communication device to be valid after the link layer negotiation is successfully performed; and

receive the service transmitted by the optical network tunnel through the physical interface of the second data communication device after the link layer state and the physical state of the physical interface are set to be valid.

15. The system according to claim 14, further comprising an optical network, wherein

the optical network is configured to establish the optical network tunnel between the first data communication device and the second data communication device;

and receive the service sent over the physical interface of the first data communication device, and transmit the service to the second data communication device.

16. A data communication device, comprising:

an establishing module, configured to establish an optical network tunnel between the data communication device and a peer data communication device;

a starting module, configured to trigger a physical interface of the data communication device directly connected to an optical network to start a link layer protocol after the establishing module successfully establishes the optical network tunnel;

a negotiating module, configured to perform link layer negotiation with the peer data communication device through the optical network tunnel established by the establishing module according to the link layer protocol started by the starting module;

a setting module, configured to set a link layer state and a physical state of the physical interface to be valid after the link layer negotiation is successfully performed by the negotiating module; and

a sending module, configured to send a service to the optical network tunnel through the physical interface after the link layer state and the physical state of the physical interface are set to be valid by the setting module.

17. The data communication device according to claim 16, further comprising:

a receiving module, configured to receive the service transmitted by the optical network tunnel established by the establishing module through the physical interface set by the setting module.