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Method for protecting DR (designated router) redundancy in PIM-SM (protocol independent multicast-sparse mode)

A PIM-SM, redundancy protection technology, applied in the field of DR redundancy protection, can solve the problems of wasting network bandwidth, wasting bandwidth, and not solving time, saving convergence time and reducing waste.

Inactive Publication Date: 2012-03-14
SUZHOU CENTEC COMM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the large amount of time taken by DR elections is not addressed
[0007] Moreover, in the second existing technical solution, running VRRP and BFD between all routers in the local network will introduce a large number of protocol packets into the local network, which wastes network bandwidth to a certain extent.
In particular, in order to achieve the millisecond-level switching required by the carrier-class network, it is necessary to send detection messages at a high frequency, and the wasted bandwidth is particularly obvious

Method used

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  • Method for protecting DR (designated router) redundancy in PIM-SM (protocol independent multicast-sparse mode)
  • Method for protecting DR (designated router) redundancy in PIM-SM (protocol independent multicast-sparse mode)
  • Method for protecting DR (designated router) redundancy in PIM-SM (protocol independent multicast-sparse mode)

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Embodiment Construction

[0018] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in which the same structures or functions are marked with the same numerals. It should be pointed out that the purpose of the drawings is only to facilitate the description of the specific embodiments of the present invention, and is not a redundant description or limitation to the scope of the present invention.

[0019] The method for DR redundancy protection in the PIM-SM provided by the present invention includes the following processes in turn: the DR election process before the network failure, to determine the DR in the network, and the DR performs the function of distributing or receiving multicast traffic; BDR election process , to determine the BDR in the network; the behavior process of BDR.

[0020] Compared with the prior art, the improved DR / BDR election mechanism of the present invention is specifically as follows:

[0021] When a PIM-SM-en...

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Abstract

The invention discloses a method for protecting DR (designated router) redundancy in PIM-SM (protocol independent multicast-sparse mode), which sequentially comprises the following processes: a DR / BDR (backup designated router) election process prior to a network fault: determining DR and BDR in a network, wherein the DR has a function of distributing or receiving multicast flow; and a BDR action process including a fault detection process: continuously detecting the DR state by the BDR, immediately switching the BDR into a new DR once a DR fault is found, and then performing the BDR election process again to reelect a new BDR. The invention can accelerate the multicast routing convergence rate in case of a DR fault, thereby realizing the quick recovery of multicast flow.

Description

technical field [0001] The invention relates to a method for DR redundancy protection in computer network data communication multicast technology. Background technique [0002] Multicast, also called multicast, is a point-to-multipoint communication method, which improves the efficiency of data transmission. Reduces the possibility of backbone network congestion. The currently used multicast routing protocols mainly include PIM-SM, PIM-DM, and MSDP. On the WAN, multicast receiving members are relatively sparse, and PIM-SM (Protocol-Independent Multicast-Sparse Mode, Protocol-Independent Multicast Sparse Mode) is mostly used. The DR (Designated Router, Designated Router) election mechanism specified in the PIM-SM protocol is as follows: [0003] When a PIM-SM-enabled interface receives a Hello packet from a neighbor, it parses the Hello packet and records three pieces of information related to DR election, such as the neighbor's primary_ip_address, dr_priority, and dr_prio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/24H04L12/56H04L12/26H04L45/28
Inventor 徐锦韬吴秀余
Owner SUZHOU CENTEC COMM CO LTD
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