Method for detection of RP state in multicast network, device, RP device and multicast system

Abstract

The invention discloses a method for detection of an RP state in a multicast network, a device, an RP device and a multicast system. The method comprises the following steps: sending a detection message with a sequential identity to an RP to be detected according to a preset sending frequency; and determining whether the RP to be detected fails or changes according to the continuity of the identity carried in a response message sent back from the RP to be detected. The device comprises a message sending module and a failure detection module. The system comprises a detection device and at least one RP device. Since the detection message with the sequential identity is sent to the RP to be detected according to the preset frequency, and the RP state is determined according to the real-time response of the RP to be detected, the embodiment of the invention can realize the rapid and accurate detection of the RP state, thereby effectively improving the convergence of the whole multicast network and enhancing the accuracy and reliability of data message transmission in the multicast network.

Description

technical field [0001] The embodiment of the present invention relates to the field of communication technologies, and in particular to a method and device for detecting RP status in a multicast network, an RP device and a multicast system. Background technique [0002] As an effective IP transmission solution, multicast technology can save backbone network bandwidth and is applicable to services with large data transmission, such as emerging e-commerce, online conferences, online auctions, video on demand and distance teaching In services such as unicast, it can effectively avoid the high requirement of network bandwidth for unicast transmission. Therefore, multicast technology has been widely used. [0003] In a multicast network, a multicast shared tree needs to be established to transmit packets, and the multicast shared tree is implemented through a multicast routing protocol. Among them, Protocol Independent Multicast Sparse Mode (PIM-SM) is a widely used multicast ro...

AI Technical Summary

Problems solved by technology

Since the BSR sends out guidance information to notify the change of the RP in the entire network only when the local RP mapping table changes, the period for the BSR to detect the failure of the RP is relatively long, usually 150s. Therefore, once the RP fails, there may be The serious situation of multicast data stream interruption occurs because the BSR waits for the RP to fail for too long

In the prior art, it is also proposed to increase the speed of multicast routing update by reducing the cycle of RP notification information, but the RP notification message is a protocol message, and the device needs to consume a lot of time to process this protocol message. resources, if there are multiple C-RPs in the network, it will cause a large burden on the BSR device, and the method of reducing the RP advertisement period can only ensure that the route convergence is completed within 3 to 5 seconds. , will still cause the loss of a large number of data packets

[0005] In the process of implementing the present invention, the inventor found that in the existing multicast technology, the time for BSR to detect and discover RP faults or changes is relatively long, so that when the RP node fails or changes, the multicast network cannot be quickly re-converged. Causes the loss of multicast packets, affecting the security and reliability of multicast network packet transmission

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