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Method and device for judging crucial links to provide quick fault recovery in software defined network

A software-defined network and critical link technology, which is applied in the field of link assurance in software-defined networks, to achieve the effects of improving reliability, reducing scale, and widening application scenarios

Inactive Publication Date: 2017-09-08
BEIJING UNIV OF POSTS & TELECOMM +1
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Problems solved by technology

The maximum VLAN_ID in the OpenFlow1.3 protocol does not exceed 4096, so this solution can only be applied to small networks

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  • Method and device for judging crucial links to provide quick fault recovery in software defined network
  • Method and device for judging crucial links to provide quick fault recovery in software defined network
  • Method and device for judging crucial links to provide quick fault recovery in software defined network

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Embodiment Construction

[0014] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0015] see figure 1 , is a flow chart of an embodiment of an optimization method for realizing fast recovery of a single SDN link in the present invention, including the following steps:

[0016] Step 101: update network topology information in time according to LLDP message;

[0017] Step 102: update the number of flow table information in the link as required, when a new service flow enters the network or when the flow table item related to the current service flow expires, the flow table number information in the link needs to be updated;

[0018] Step 103: establish an ILP (Integral Linear Programming) model according to the current network topology information, and use the HILPR algorithm to solve the key links in the network topology;

[0019] Step 104: to the critical link in the step 103 according to the connection that single link reduces ho...

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Abstract

The invention discloses a method and a device for judging crucial links to provide quick fault recovery in a software defined network. The method comprises the following steps of obtaining a network topology through real-time detection of a controller; counting the number of business flows borne by each link according to a PACKET-IN message sent by a switch; applying a linear programming algorithm HILPR to carry out iterative solution to obtain the crucial links in the current network topology; endowing key indexes to the links according to the number of connection pairs which are reduced after the single link is removed from the network; combining the key indexes of the crucial links and the business flow number indexes borne on the key indexes to obtain a combined score; dividing the links into the different levels according to the score of the links and providing different link guarantee mechanisms; and providing protection mechanisms based on spare paths for the links with the high level and providing controller involved recovery mechanisms for the links with the low level.

Description

technical field [0001] The invention relates to the technical field of link assurance in software-defined networks, in particular to a method and device for determining critical links in software-defined networks and providing fast fault recovery. Background technique [0002] At present, the advent of the Internet era has spawned many new services, and in order to better meet the needs of users, the indicators of the services are getting higher and higher, and at the same time, new requirements are put forward for the network carrying these services. Among them, in order to ensure the service quality of the voice communication, the operator's network requires the delay time of the service flow to be within 50 ms. At the same time, in order to ensure the sustainable operation of the business, it is necessary to provide guarantee for the link so that the link can be restored quickly when it fails. [0003] The existing fast recovery schemes for links are mainly divided into ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/24
CPCH04L41/0654
Inventor 崔鸿雁刘凯张雨晨
Owner BEIJING UNIV OF POSTS & TELECOMM
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