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Graceful restart method based on PIM SM protocol and system thereof

A graceful restart and restart technology, which is applied in the field of graceful restart technology, can solve problems such as long time keeping table items alive, failure to establish registration status on the control plane, and failure to restore registration status in a short time, so as to avoid network problems.

Active Publication Date: 2010-11-24
MAIPU COMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the master-slave switch of the source DR device, because the MFIB is backed up on the data plane, the multicast service data from the multicast source S will not trigger the sending of the no cache message, so the control plane cannot establish the registration state before the MFIB is deleted
During the restart process, the MFIB can only be deleted through natural aging (that is, the keep-alive timer expires), and usually the keep-alive time of the entry is very long, which makes it impossible to restore the registration status on the source DR in a short time during the restart process

Method used

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  • Graceful restart method based on PIM SM protocol and system thereof
  • Graceful restart method based on PIM SM protocol and system thereof
  • Graceful restart method based on PIM SM protocol and system thereof

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Embodiment

[0058] like Figure 4 In the network environment shown, it is assumed that all devices in the figure support the graceful restart function of PIM SM. The source DR initiates a multicast source registration to the RP, and the RP fills in the registration state (S, G) In the outbound interface of the entry. At the same time, (S, G) join is initiated to the source DR. (S, G) entries are established on the devices between the source DR and RP. In the absence of RPT switching, the multicast stream flows from the source DR to the RP, and then from the RP to each receiver.

[0059] In this embodiment, a master-slave switchover occurs on the RP device.

[0060] Step 1: The RP sets the S flag of the graceful restart field in the hello message. At this time, the device checks that there is a local loopback0 interface configured as dynamic rp-candidate in the static configuration, so it fills the loopback0 address into the local RP list. , notify HR1 and HR2 that it has restarted by...

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Abstract

The invention provides a graceful restart method based on a PIM SM protocol, which can realize faster convergence of multicast protocol states, and a system for realizing the method. In the method, neighbor equipment checks all interfaces connected with restart equipment, and if any IGMP member exists on the interfaces, an IGMP host member report is forged and sent to the restart equipment; the restart equipment recovers an IGMP member state under the interface corresponding to the IGMP host member report by analyzing the IP address of a multicast group in the IGMP host member report; the neighbor equipment on all the interfaces of the restart equipment checks IGMP member information on network segments connected with the restart equipment, and if any IGMP member exists, the IGMP host member report is constructed; and thus, the restart equipment can fast recover the IGMP member information on each interface without waiting for the IGMP member report respectively sent by the host on each interface. The invention enables the restart equipment control plane to quicken the recovery rate of the IGMP member state.

Description

technical field [0001] The present invention relates to the technical field of data communication, in particular to a graceful restart technology of PIM SM (sparse mode independent multicast protocol, protocolindependent multicast sparse mode). Background technique [0002] At present, the emerging streaming media services have higher requirements on reliability, and device-level reliability is an important aspect to achieve service reliability. High-reliability equipment usually adopts a distributed architecture with separate data plane and control plane, and a dual-master redundant design. The distributed architecture that separates the data plane and the control plane divides the device into two layers: control and forwarding. The control layer is responsible for routing control and calculation, and the forwarding layer is only responsible for data forwarding. A device that supports dual-master redundancy uses two MPUs (main processing units). The master MPU is in the wo...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L12/24H04L12/18H04L29/06H04L29/12
Inventor 熊思王强
Owner MAIPU COMM TECH CO LTD
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