BIDIRECTIONAL FORWARDING DETECTION BFD SESSION NEGOTIATION METHOD, DEVICE, AND SYSTEM

• US 20140307564A1
• Filed: 06/25/2014
• Published: 10/16/2014
• Est. Priority Date: 11/13/2012
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Xiong, Yu, Li, Jingtang
• Granted Patent: US 9,444,709 B2
• Time in Patent Office: Days
• US Class Current: 370/242
• CPC Class Codes: H04L 43/0811 by checking connectivity
• CPC Class Codes: H04L 43/0823 Errors, e.g. transmission errors
• CPC Class Codes: H04L 63/08 for authentication of entities cryptographic mechanisms or cryptographic arrangements for entity authentication H04L9/32
• CPC Class Codes: H04L 63/1441 Countermeasures against malicious traffic countermeasures against attacks on cryptographic mechanisms H04L9/002
• CPC Class Codes: H04L 63/162 at the data link layer
• CPC Class Codes: H04L 67/141 Setup of application sessions admission control or resource allocation in data switching networks H04L47/70
• CPC Class Codes: H04L 67/146 Markers for unambiguous identification of a particular session, e.g. session cookie or URL-encoding
• CPC Class Codes: H04L 67/63 Routing a service request depending on the request content or context
• CPC Class Codes: H04L 69/24 Negotiation of communication capabilities
• CPC Class Codes: H04L 69/40 for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection management of faults, events, alarms or notifications in data switching networks H04L41/06

Abstract

The present invention relates to a BFD session negotiation method. The BFD session negotiation method includes: generating a first discriminator value, where the first discriminator value is unique in a local area network to which a local device belongs; generating a first BFD control packet, where the first BFD control packet includes the first discriminator value; and sending the first BFD control packet to a peer device, so that the peer device performs a session negotiation with the local device according to the first discriminator value.

Claims

1. A bidirectional forwarding detection (BFD) session negotiation method, comprising:

generating a first discriminator value, wherein the first discriminator value is unique in a local area network to which a local device belongs;

generating a first BFD control packet, wherein the first BFD control packet comprises the first discriminator value; and

sending the first BFD control packet to a peer device, so that the peer device performs a session negotiation with the local device according to the first discriminator value.

2. The method according to claim 1, wherein after sending the first BFD control packet to a peer device, the method further comprises:

receiving a second BFD control packet from the peer device, wherein the second BFD control packet carries a second discriminator value generated by the peer device; and

using the first discriminator value and the second discriminator value to identify a session.

3. The method according to claim 1, wherein generating a first discriminator value comprises:

generating the first discriminator value according to identification information of the local device.

4. The method according to claim 3, wherein the identification information of the local device comprises one or more of a media access control MAC address, a device name, an interface IP, and an outbound interface index of the local device.

5. The method according to claim 3, wherein generating a first discriminator value comprises:

combining a result, which is obtained by mapping, according to a set mapping algorithm, the identification information of the local device, and a serial number of a session corresponding to the first BFD control packet to form the first discriminator value.

6. The method according to claim 5, wherein the set mapping algorithm comprises a hash algorithm, and the result obtained by mapping comprises a hash index.

7. A bidirectional forwarding detection (BFD) session negotiation device, comprising:

a discriminator value generating unit, configured to generate a first discriminator value, wherein the first discriminator value is unique in a local area network to which a local device belongs;

a packet generating unit, configured to generate a first BFD control packet, wherein the first BFD control packet comprises the first discriminator value; and

a packet sending unit, configured to send the first BFD control packet to a peer device, so that the peer device performs a session negotiation with the local device according to the first discriminator value.

8. The device according to claim 7, comprising:

a packet receiving unit configured to receive a second BFD control packet from the peer device, wherein the second BFD control packet carries a second discriminator value generated by the peer device; and

a session negotiation unit configured to use the first discriminator value and the second discriminator value to identify a session.

9. A bidirectional forwarding detection (BFD) session negotiation system, comprising:

a local device configured to;

generate a first discriminator value, wherein the first discriminator value is unique in a local area network to which the local device belongs,

generate a first BFD control packet, wherein the first BFD control packet comprises the first discriminator value, and

send the first BFD control packet to a peer device; and

wherein the peer device is configured to perform a session negotiation with the local device according to the first discriminator value.

10. The system according to claim 9, wherein the peer device is configured to send a second BFD control packet to the local device, the second BFD control packet carries a second discriminator value generated by the peer device, and the second discriminator value is unique in a local area network to which the peer device belongs.

11. The system according to claim 10, wherein the local device is further configured to receive the second BFD control packet and use the first discriminator value and the second discriminator value to identify a session.