Protocol-independent forwarding network rapid fault detection and flow protection switching method

A forwarding network, protocol-independent technology, applied in the Internet field, can solve the problems of limited protocol type support, poor flexibility, affecting multicast, etc., achieving high scalability and adaptability, reducing complexity and cost, and high-scale adaptability sexual effect

Active Publication Date: 2016-08-24
INST OF INFORMATION ENG CAS
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] ·It can only support existing protocols such as Ethernet, IP, MPLS, etc., and is limited by OpenFlow's support range of protocol types, and cannot flexibly support new protocols;
[0008] Need to implement a hardware message generation engine, which increases the complexity and cost of the switch, and can only generate messages with a relatively fixed format, which has poor flexibility;
[0009] It is necessary to establish a BFD session between the entry node and the exit node of the flow. In a lar

Method used

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  • Protocol-independent forwarding network rapid fault detection and flow protection switching method
  • Protocol-independent forwarding network rapid fault detection and flow protection switching method
  • Protocol-independent forwarding network rapid fault detection and flow protection switching method

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Embodiment Construction

[0047] The present invention includes two parts: fast fault detection and flow protection switching, and their working processes are described as follows.

[0048] 1.1 Fast Fault Detection

[0049] In order to quickly detect a link or node failure between two network nodes, a connectivity check session must be established between the two nodes, and connectivity check messages are sent bidirectionally, such as figure 1 shown.

[0050] Other nodes may be included between the two endpoints of the connectivity check session. Since other nodes can be quickly notified of failure events through the mechanism proposed by the present invention, it is generally only necessary to establish sessions between directly connected nodes.

[0051] A connectivity check session consists of two directions. by figure 1 Taking the direction from switch S1 to switch S2 as an example, the working process is as follows:

[0052] Extend the POF protocol and add a new type of TIMER_CONFIG message (t...

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Abstract

The invention discloses a protocol-independent forwarding network rapid fault detection and flow protection switching method which includes following steps. A controller notifies that each pair of switches S1 and S2 start a timer respectively. When a transmission timer on the S1 is overtime, a connectivity inspection message is generated and sent to S2, and S2 sets a stream metadata unit FM_CC as r. When an inspection timer on S2 is overtime, the FM_CC value is detected. If the FM_CC value is r, then the FM_CC value is set to b; if the FM_CC value is b, a fault notice message is generated and sent to switch that has to respond to the fault event, and S1 is notified of the fault. S1 sends the fault notice to a switch that has to respond to the fault event. When a source node sends data to a target node through a flow switching node, the flow switching node checks the availability of a main path. If the main path is available, the data are transmitted through the main path; otherwise, a standby path is selected for data transmission.

Description

technical field [0001] The invention relates to the technical field of the Internet, in particular to a fast fault detection and flow protection switching method in a protocol-independent forwarding (POF)-based software-defined network (SDN). Background technique [0002] Protocol Independent Forwarding (POF) is an extension to the software-defined networking (SDN) southbound interface protocol OpenFlow. POF provides the ability for the SDN controller to directly specify the offset and length of the rule matching field and the instruction operation field, and defines field modification, insertion, deletion, mathematical and logical operations, checksum calculation, instruction jump and other instructions for Various operations are performed on the message, and new features such as Flow Metadata and instruction modification are added. In the POF network, the data plane does not need to have the knowledge of specific network protocols, and only needs to follow the rules issue...

Claims

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Application Information

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IPC IPC(8): H04L12/711H04L12/703H04L12/26H04L45/247H04L45/28
CPCH04L43/0811H04L43/10H04L45/22H04L45/28
Inventor 郑宏波葛敬国鄂跃鹏吕红蕾张磊韩春静
Owner INST OF INFORMATION ENG CAS
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