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Time synchronization method and apparatus

A time synchronization and time technology, applied in the field of Ethernet, can solve problems such as network traffic influence, traffic congestion, time synchronization result error, etc., and achieve the effect of avoiding the influence of network traffic, simplifying the calculation method, and widening the application range

Active Publication Date: 2008-10-29
NEW H3C TECH CO LTD
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Problems solved by technology

[0015] 1. The network time protocol is relatively complicated, and the concept of client / server is introduced. The NTP time server needs to respond to the NTP protocol message of the client
[0016] 2. The important parameter "transmission delay" in time synchronization is easily affected by network traffic
In different directions of the same link, there may be different traffic congestion or idle states. Therefore, the round-trip time of packets on the same link is usually not equal. Therefore, the link transmission delay calculated according to the NTP protocol is easy Affected by network traffic, resulting in large errors in time synchronization results
[0017] 3. The NTP protocol is based on more than three layers of protocols (such as UDP and IP). If the device is not configured with three layers of protocols, it cannot be applied
For example, in the initial deployment phase of the network or just after restarting, engineers and technicians often use the Ethernet OAM protocol to test the link status. At this time, there is actually a requirement to configure the device time, but the network time protocol Such application-layer protocols are often not yet configured to use

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Embodiment Construction

[0053] Since the Ethernet entity (port) in the OAM loopback state is in a link interruption state for the upper-layer protocols above Layer 3, there is no data message from the upper-layer protocol, so no network traffic will affect time synchronization. The present invention aims at this feature. When the OAM connection is in the remote loopback state, the system time of the remote device is set by the near-end device, which avoids the influence of the network flow of the upper layer protocol on the time synchronization. The present invention will be further described through specific embodiments below in conjunction with the accompanying drawings.

[0054] In order to understand this embodiment more easily, the OAM loopback function is briefly introduced first.

[0055] According to the description of the IEEE 802.3ah protocol, the main purpose of the loopback function is to locate faults and test link performance. In order to achieve the purpose of link performance testing...

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Abstract

The invention provides a time synchronization method and a device. The time synchronization method of the invention measures the propagation delay between proximal end equipment and distant end equipment when the distant end equipment is in the state of loop-back so as to realize time synchronization. According to the invention, the influence of the network traffic on the time synchronization result can be avoided.

Description

technical field [0001] The present invention relates to the technical field of Ethernet, in particular to a method for synchronizing time between a near-end device and a remote device with an Ethernet operation, administration, and maintenance (OAM, Operations, Administration, and Maintenance) connection established and equipment. Background technique [0002] The Institute of Electrical and Electronics Engineers (IEEE, Institute of Electrical and Electronics Engineers) has formulated a protocol for detecting the status of an Ethernet direct link in the IEEE802.3ah standard, called the Ethernet OAM protocol. It works at the data link layer and uses OAM Protocol Data Units (OAMPDU, OAM Protocol Data Units) to be exchanged regularly between devices to report the status of the network, enabling network administrators to manage the network more effectively. [0003] The Ethernet OAM connection process is also called a discovery (Discovery) phase. In this phase, the OAM entity d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06
Inventor 韩琦
Owner NEW H3C TECH CO LTD
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