Message transmission method and device

Abstract

The embodiment of the invention provides a message transmission method and device. The message transmission method comprises steps that a first network device receives a first message sent by a previous hop device of the first network device, wherein the first message comprises an SR header; the first network device generates cache index information of the SR header and stores the cache index information and the SR header; the first network device generates a second message according to the first message, wherein the second message comprises cache index information and does not comprise an SRheaderer; and the first network device sends the second message to the second network device. When the first network device caches the SR header of the first message, the cache index information is generated, the cache index information is carried in the second message, the cache index information sent to the second network device by the first network device is the same as the cache index information received by the first network device from the second network device, and the SR header can be successfully recovered through the cache index information which is not changed, so that the normal forwarding of the message is ensured.

Description

technical field [0001] The embodiments of the present application relate to the field of communication technologies, and in particular, to a message transmission method and device. Background technique [0002] The Internet Engineering Task Force (IETF) Service Function Chain (SFC) Working Group (Working Group, WG) defines the SFC implementation framework. The network element types of the SFC data plane may include: a classifier (Classifier), a service function forwarder (Service Function Forwarder, SFF), an SFC proxy (SFC proxy) and a service function device (Service Function, SF). [0003] When implementing segment routing (Segment Routing, SR) SFC, if the SF does not support SR, the SFF must implement the SR proxy function. The message processing flow is as follows: When an SFF receives an SR message from the upstream device of the SFF and needs to implement the SR dynamic proxy function, before the SFF forwards the service message to the SF, it needs to strip and cache ...

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Problems solved by technology

[0004] However, when SFF implements the above-mentioned SR dynamic proxy function, if SF modifies the 5-tuple of the service message, then when SFF receives the service message returned by SF, it will not be able to use the 5-tuple to successfully query and restore the SR header Encapsulation, resulting in packet forwarding failure

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