Method, device and system for sending and receiving messages

Abstract

The present invention relates to technologies in the communication field, and in particular to a method, device and system for sending and receiving messages. The method obtains the export encapsulation table information corresponding to the pseudowire PW label; After the control word is added to the text, add the control word in the current message and send it; analyze the received current message; find the corresponding index label attribute table according to the pseudowire PW label information of the current message obtained by the analysis; according to the index label attribute The control word identifier in the table determines that the current message carries the control word, and then processes the current message according to the type of the current message. By using the message sending and receiving method, device and system provided by the embodiments of the present invention, the control word can be selected to be turned on or off according to specific scenarios, reducing the probability of message mishandling.

Description

technical field [0001] The present invention relates to the technology in the field of communication, and in particular to a message sending and receiving method, device and system. Background technique [0002] MPLS (Multi-Protocol Label Switching, multi-protocol label switching technology) is a technology based on label encapsulation and forwarding. It combines the powerful three-layer routing function of IP network and the efficient forwarding mechanism of traditional two-layer network, thus greatly improving the Forwarding efficiency. The edge device of the MPLS PSN (Packet Switched Network, packet switching network) performs label encapsulation and decapsulation on the data message and forwards it to the final user equipment, and the intermediate device only performs label forwarding. Since the payload in the message is not modified during the MPLS forwarding process, the payload is the part except the public network MAC (Multiple Access Channel, multiple access channe...

AI Technical Summary

Problems solved by technology

In this case, if the control word based on global opening and closing is used, the above two requirements cannot be met at the same time.

In addition, when interconnecting with other devices, if the control word modes on both sides are inconsistent, it will cause processing errors. Suppose there is the following MPLS PSN scenario: if the peer device enables the control word, the MPLS packets received by the local device carry control Word field, if the local device does not enable the control word, it will not recognize the control word in the message, and mistakenly use it as the payload part of the message, resulting in a forwarding error; otherwise, from the local device to the peer The message of the end device does not carry the control word information, and the peer device has enabled the control word, so the peer end will mistakenly treat the 4 bytes after the PW label in the MPLS message sent by the local end as the control word.

Images