Connectivity detection session creation method, network device, and system

Patent metadata

Field	Value
Publication number	US-11863394-B2
Application number	US-202117375348-A
Country	US
Kind code	B2
Filing date	Jul 14, 2021
Priority date	Jan 16, 2019
Publication date	Jan 2, 2024
Grant date	Jan 2, 2024

Abstract

A connectivity detection session creation method, a network device, and a system, to create a connectivity detection session in an EVPN. The method includes: receiving, by the first network device, a creation message of a connectivity detection session from the second network device, where the creation message of the connectivity detection session carries an inclusive multicast route of the second network device and session information of the second network device; determining, by the first network device, that a local inclusive multicast routing table includes the inclusive multicast route of the second network device; and creating, by the first network device, the connectivity detection session with the second network device based on the session information of the second network device.

First claim

What is claimed is:

1. A connectivity detection session creation method, wherein the method is applied to an Ethernet virtual private network (EVPN), the EVPN comprises a first network device and a second network device, and the method comprises:
receiving, by the first network device, a creation message of a connectivity detection session from the second network device, wherein the creation message of the connectivity detection session carries an inclusive multicast route of the second network device and session information of the second network device;
determining, by the first network device, that a local inclusive multicast routing table comprises the inclusive multicast route of the second network device; and
creating, by the first network device, the connectivity detection session with the second network device based on the session information of the second network device.

2. The method according to claim 1 , wherein the receiving, by the first network device, of a creation message of a connectivity detection session from the second network device comprises:
receiving, by the first network device, the creation message of the connectivity detection session that is sent by the second network device in a broadcast or multicast manner.

3. The method according to claim 1 , wherein before the receiving, by the first network device, of a creation message of a connectivity detection session from the second network device, the method further comprises:
obtaining, by the first network device, the inclusive multicast routing table, wherein the inclusive multicast routing table comprises the inclusive multicast route of the second network device.

4. The method according to claim 1 , wherein the connectivity detection session comprises a connectivity fault management (CFM) session.

5. The method according to claim 1 , wherein a type-length-value (TLV) field in the creation message of the connectivity detection session comprises the inclusive multicast route of the second network device, the TLV field comprises a type, a length, and a value, the type is used to indicate that a type of the TLV field is the inclusive multicast route, the length is used to indicate a length of the TLV field, and the value is the inclusive multicast route of the second network device.

6. The method according to claim 1 , wherein the session information of the second network device comprises a maintenance association end point identifier (MEP ID) or a session identifier (Session ID) of the second network device.

7. The method according to claim 6 , further comprising:
obtaining, by the first network device, an MEP ID range or a session ID range, wherein the MEP ID range comprises the MEP ID of the second network device, or the session ID range comprises the session ID of the second network device; and
before the creating, by the first network device, of the connectivity detection session with the second network device based on the session information of the second network device, the method further comprises:
determining, by the first network device, that the MEP ID of the second network device is within the MEP ID range; or
determining, by the first network device, that the session ID of the second network device is within the session ID range.

8. A connectivity detection session creation method, wherein the method is applied to an Ethernet virtual private network (EVPN), the EVPN comprises a first network device and a second network device, and the method comprises:
obtaining, by the second network device, an inclusive multicast route of the second network device; and
sending, by the second network device, a creation message of a connectivity detection session to the first network device, wherein the creation message of the connectivity detection session carries the inclusive multicast route and session information of the second network device, and the session information is used to create the connectivity detection session.

9. The method according to claim 8 , wherein the sending, by the second network device, of a creation message of a connectivity detection session to the first network device comprises:
sending, by the second network device, the creation message of the connectivity detection session to each network device in the EVPN in a broadcast or multicast manner.

10. The method according to claim 8 , wherein the connectivity detection session comprises a connectivity fault management (CFM) session.

11. The method according to claim 8 , wherein a type-length-value (TLV) field in the creation message of the connectivity detection session comprises the inclusive multicast route of the second network device, the TLV field comprises a type, a length, and a value, the type is used to indicate that a type of the TLV field is the inclusive multicast route, the length is used to indicate a length of the TLV field, and the value is the inclusive multicast route of the second network device.

12. The method according to claim 8 , wherein the session information of the second network device comprises a maintenance association end point identifier (MEP ID) or a session identifier (session ID) of the second network device.

13. A network device serving as a first network device, comprising:
a transceiver, a memory, and a processor, wherein
the processor is configured to execute a computer-readable instruction in the memory to cause the network device to perform the following operations:
receiving a creation message of a connectivity detection session from a second network device, wherein the creation message of the connectivity detection session carries an inclusive multicast route of the second network device and session information of the second network device;
determining that a local inclusive multicast routing table comprises the inclusive multicast route of the second network device; and
creating the connectivity detection session with the second network device based on the session information of the second network device.

14. The first network device according to claim 13 , wherein the processor is configured to execute the instruction to cause the network device to:
receive the creation message of the connectivity detection session that is sent by the second network device in a broadcast or multicast manner.

15. The first network device according to claim 13 , wherein the processor is further configured to:
obtain the inclusive multicast routing table, wherein the inclusive multicast routing table comprises the inclusive multicast route of the second network device.

16. The first network device according to claim 13 , wherein the connectivity detection session comprises a connectivity fault management (CFM) session.

17. The first network device according to claim 13 , wherein a type-length-value (TLV) field in the creation message of the connectivity detection session comprises the inclusive multicast route of the second network device, the TLV field comprises a type, a length, and a value, the type is used to indicate that a type of the TLV field is the inclusive multicast route, the length is used to indicate a length of the TLV field, and the value is the inclusive multicast route of the second network device.

18. The first network device according to claim 13 , wherein the session information of the second network device comprises a MEP ID or a session ID of the second network device.

19. The first network device according to claim 13 , wherein the processor is further configured to:
obtain a maintenance association end point identifier (MEP

Assignees

• Huawei Tech Co Ltd

Inventors

• Li Xiaojing

Classifications

• H04L12/4641 Primary

  Virtual LANs, VLANs, e.g. virtual private networks [VPN] (LAN interconnection over a bridge based backbone H04L12/462; encapsulation techniques H04L12/4633; routing of packets H04L45/00; packet switches H04L49/00; virtual private networks for security H04L63/0272) · CPC title

• H04L41/12 Primary

  Discovery or management of network topologies · CPC title

• H04L45/66

  Layer 2 routing, e.g. in Ethernet based MAN's · CPC title

• H04L67/141

  Setup of application sessions (admission control or resource allocation in data switching networks H04L47/70) · CPC title

• H04L12/1877

  Measures taken prior to transmission · CPC title