Method and device for recognizing PTP (precise time protocol) messages in MPLS (multi-protocol label switching) network

Abstract

The invention discloses a method and a device for recognizing PTP (precise time protocol) messages in an MPLS (multi-protocol label switching) network. According to the method and the device, when messages entering the MPLS network are packaged by an input direction edge label switching router according to differences between the PTP massages and non-PTP messages, reserved Ethernet type domains are filled with different Ethernet type fields; when the messages are analyzed in a label switching router, the PTP messages are recognized through the Ethernet type fields, timestamps and time domain deviation information are acquired for the PTP messages, and time domain information is updated; the messages are forwarded to an output direction edge label switching router for unpackaging after MPLS forwarding information is acquired. The method and the device have the advantages that label stacks which MPLS forwarding depends on do not need to be changed, MPLS label number and structure are not changed, PTP network deployment in the MPLS network is simplified, and recognition speed of the PTP messages in the MPLS network is increased.

Description

technical field [0001] The invention relates to the field of network communication, in particular to a hardware-based method and device for realizing PTP message identification in an MPLS network. Background technique [0002] With the development of mobile data services, the time synchronization requirements of mobile base stations are also constantly improving. In traditional networks, GPS is used for time synchronization between mobile base stations. However, GPS synchronization has high installation and maintenance costs. , high requirements for the installation environment and security factors of the national telecommunications network, etc., so PTP (Precision Time Protocol, precise clock synchronization protocol) has become an alternative to GPS. PTP is a high-precision time synchronization protocol defined by IEEE1588. Compared with traditional timing technology, PTP has obvious advantages. It uses two-way channels with ns-level precision, low cost, and can adapt to d...

AI Technical Summary

Problems solved by technology

[0005] 1) The identification of the message depends on the label stack of the MPLS message, which is not conducive to the network chip to identify the PTP message at the first time

[0006] 2) All edge devices must establish Timing LSPs with the main device. With the increase of edge devices, more Timing LSPs need to be maintained, and the scalability is poor

[0009] This patent discloses a method for identifying a PTP message by changing the label stack of the message, which solves the problem associated with the number of Timing LSPs and the number of edge devices in the above technology, but it still has limitations: 1) report The identification of the text depends on the label stack of the MPLS message, which is not conducive to the network chip to identify the PTP message at the first time; 2) At the same time, the number of MPLS labels is increased. If there are multiple labels, such as LSP over LSP, they must be in the label Add multiple Reverse Labels to the stack to increase the forwarding difficulty of network devices

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