A method and device for identifying ptp messages in mpls network

Abstract

The present invention discloses a method and device for identifying PTP messages in an MPLS network. According to the difference between PTP messages and non-PTP messages, the messages entering the MPLS network are encapsulated in edge label switching routers in the incoming direction. , fill in different Ethernet type fields in the reserved Ethernet type field, and when parsing the packet in the label switching router, identify the PTP packet through the Ethernet type field, and obtain the time stamp and Time domain offset information, and update the time domain information, and at the same time obtain the MPLS forwarding information, forward the message to the outgoing edge label switching router for decapsulation processing. The present invention does not need to change the label stack on which MPLS forwarding depends, does not change the number and structure of MPLS labels, simplifies the network deployment of PTP in the MPLS network, and also improves the identification and processing speed of PTP messages in the MPLS network.

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 the 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 ...

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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