WO2016031923A1 - Commutateur, système de réseau superposé, procédé et programme de changement de configuration de tunnel - Google Patents

Commutateur, système de réseau superposé, procédé et programme de changement de configuration de tunnel Download PDF

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Publication number
WO2016031923A1
WO2016031923A1 PCT/JP2015/074257 JP2015074257W WO2016031923A1 WO 2016031923 A1 WO2016031923 A1 WO 2016031923A1 JP 2015074257 W JP2015074257 W JP 2015074257W WO 2016031923 A1 WO2016031923 A1 WO 2016031923A1
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identification information
processing unit
tunnel
change
flow identification
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PCT/JP2015/074257
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English (en)
Japanese (ja)
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直之 岩下
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日本電気株式会社
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  • the present invention is based on a Japanese patent application: Japanese Patent Application No. 2014-173909 (filed on August 28, 2014), and the entire description of the application is incorporated herein by reference.
  • the present invention relates to a switch, an overlay network system, a tunnel setting changing method, and a program, and more particularly, a switch and an overlay network system that function as a tunnel endpoint that performs encapsulation and decapsulation of a frame to be transmitted to and received from an opposite tunnel endpoint.
  • the present invention relates to a tunnel setting changing method and program.
  • Non-Patent Document 1 is a draft of VXLAN (refer to the section of Page 10, Outer UDP Header).
  • Non-Patent Documents 2 and 3 are specifications of OpenFlow white paper and OpenFlow switch, which are related technologies of the present invention.
  • Patent Document 1 discloses a circuit emulation method using an IP interworking VLL (virtual dedicated line) using an IP / MPLS (Internet Protocol / Multi-Protocol Label Switching) cloud.
  • IP interworking VLL virtual dedicated line
  • MPLS Internet Protocol / Multi-Protocol Label Switching
  • An object of the present invention is to provide a switch, an overlay network system, a tunnel setting change method, and a program that can contribute to improvement of a tunnel setting change function of a switch that functions as a tunnel endpoint of an overlay network system.
  • a tunnel processing unit that performs encapsulation and decapsulation of a frame to be transmitted to and received from an opposite tunnel end point, and a flow for identifying the encapsulated frame
  • a change instruction receiving unit that receives an instruction to change identification information, and a change processing unit that changes the flow identification information used by the tunnel processing unit on the condition that a predetermined period has elapsed after receiving the instruction to change the flow identification information.
  • a switch is provided.
  • an overlay network system configured using the above switch is provided.
  • an encapsulated frame is identified as a tunnel end point of an overlay network in a switch having a tunnel processing unit that encapsulates and decapsulates a frame transmitted / received to / from an opposite tunnel end point.
  • Receiving a flow identification information change instruction to change the flow identification information used by the tunnel processing unit on condition that a predetermined period has elapsed after receiving the flow identification information change instruction; A method for changing a tunnel setting is provided. This method is associated with a specific machine called a switch that changes a tunnel setting based on an instruction to change flow identification information received from another device.
  • encapsulation is performed on a computer mounted on a switch equipped with a tunnel processing unit that performs encapsulation and decapsulation of a frame transmitted to and received from an opposite tunnel end point.
  • Flow identification information used by the tunnel processing unit on the condition that a predetermined period has elapsed after receiving the flow identification information change instruction for identifying the received frame and the flow identification information change instruction
  • a program for executing the program can be recorded on a computer-readable (non-transient) storage medium. That is, the present invention can be embodied as a computer program product.
  • the present invention it is possible to contribute to the improvement of the change function of the tunnel setting of the switch functioning as the tunnel end point of the overlay network system. That is, the present invention converts the switch shown in the background art into a switch that functions more suitably as a tunnel end point of the overlay network system.
  • a tunnel processing unit 260a that performs encapsulation and decapsulation of a frame to be transmitted to and received from an opposite tunnel endpoint as a tunnel endpoint of an overlay network,
  • a switch 200a including an instruction receiving unit 261a and a change processing unit 262a is provided.
  • the change instruction receiving unit 261a receives a flow identification information change instruction (AAA ⁇ BBB) for identifying an encapsulated frame from another device or the like, and passes it to the change processing unit 262a. .
  • the change processing unit 262a uses the flow identification information (such as UDP port information in the UDP port information storage unit 266a) used by the tunnel processing unit 260a on the condition that a predetermined period has elapsed after receiving the flow identification information change instruction. ).
  • a predetermined period set as a period until the switch 200a changes the flow identification information is a period in which the flow identification information does not match with other switches (tunnel communication is not performed).
  • the period is not particularly limited as long as it is a period (desirably minimized) that is shorter.
  • a time is set such that the flow identification information is simultaneously changed in each switch at a certain timing.
  • a period until the flow identification information is changed may be embedded in the flow identification information itself. At this time, a value may be set in consideration of the time at which the flow identification information change instruction reaches each switch, or an arbitrary time or the like is designated based on time information common to each switch. You may do it.
  • the flow identification information change instruction may be received from another switch that has been operated by an operator or the like, or may be received from an arbitrary switch management device or the like.
  • the process for changing the flow identification information is automated, and operation costs can be greatly reduced compared to a method in which an operator or the like individually changes settings for each switch. It becomes possible.
  • by performing the flow identification information changing process based on the predetermined period it is possible to shorten the period during which tunnel communication is disabled.
  • FIG. 2 is a diagram illustrating a configuration of the overlay network system according to the first embodiment of this invention.
  • a plurality of virtual switches 200A to 200C arranged as tunnel end points of the overlay network system, a flow control device 100 that controls these virtual switches 200, and these virtual switches 200 are used to communicate with each other.
  • a configuration including virtual machines 300A to 300E is shown.
  • VXLAN tunnels 400AB-1 to 400BC-2 which will be described later, are constructed.
  • virtual switch 200 when the virtual switches 200A to 200C, the virtual machines 300A to 300E, and the VXLAN tunnels 400AB-1 to 400BC-2 are not particularly distinguished, they are referred to as “virtual switch 200”, “virtual machine 300”, and “VXLAN tunnel 400”, respectively. .
  • the flow control device 100 performs flow management for constructing the VXLAN tunnel 400 in a mesh shape between the virtual switches 200, and instructs flow setting to one or more virtual switches 200. Thereby, the flow control apparatus 100 realizes a communication network between the virtual machines 300.
  • Such a flow control device 100 can be realized by adding a tunnel management function to the OpenFlow controllers of Non-Patent Documents 2 and 3.
  • the virtual switch 200 selects a flow entry having a matching condition that matches the input frame from the flow entries set by the instruction of the flow control apparatus 100 for the input frame from the virtual machine 300 or another virtual switch. To process the input frame.
  • the virtual switch 200 outputs the input frame to the VXLAN tunnel 400 for connection with the other virtual machine 300 according to the selected flow entry, and outputs it to the other virtual switch 200 across the base network 500, or the flow control device 100. Output to or drop.
  • the virtual machine 300 transmits a frame addressed to the other virtual machine 300 to the virtual switch 200 and receives a frame originating from the other virtual machine 300 from the virtual switch 200. Further, the virtual machine 300 does not need to be directly connected to the virtual switch 200 and may be connected via a layer 2 switch (L2SW), or the virtual machine 300 is a layer 3 switch (L3SW) or a router. In some cases, another virtual machine 300 is connected to the destination.
  • L2SW layer 2 switch
  • L3SW layer 3 switch
  • another virtual machine 300 is connected to the destination.
  • the virtual switch 200 and the virtual machine 300 in the connected state may be virtual entities that operate on the same virtualization server by using server virtualization technology.
  • the infrastructure network 500 is a layer 3 network or the like for performing frame transfer between the virtual switches 200.
  • the infrastructure network 500 can communicate with a destination IP address given when encapsulated in VXLAN, and when a multicast address is set as the destination, all virtual switches 200 It can be delivered to.
  • FIG. 3 is a diagram illustrating a configuration of the virtual switch according to the first embodiment.
  • the configuration includes a flow entry search unit 201, a flow entry storage unit 202, a flow entry processing unit 203, a flow processing unit 204, a flow control device communication unit 205, and a VXLAN processing unit 250. It is shown.
  • the flow entry search unit 201, the flow entry storage unit 202, the flow entry processing unit 203, the flow processing unit 204, and the flow control device communication unit 205 correspond to the function of the open flow switch of Non-Patent Document 1. Is done.
  • the VXLAN processing unit 250 and the command processing unit 251 and the tunnel processing units 260-1 and 260-2 (hereinafter referred to as “tunnel processing unit 260” unless the tunnel processing units 260-1 and 260-2 are particularly distinguished). And.
  • the tunnel processing unit 260 passes the VXLAN-encapsulated frame input from the VXLAN tunnel 400 to the flow entry search unit 201, and performs VXLAN decapsulation as necessary according to the instruction of the flow processing unit 204, and outputs it to the virtual machine 300.
  • the tunnel processing unit 260 passes the frame input from the virtual machine 300 to the flow entry search unit 201, encapsulates VXLAN as necessary in accordance with the instruction of the flow processing unit 204, and establishes a virtual interface facing through the VXLAN tunnel 400. A process of transferring to the switch 200 is performed.
  • the command processing unit 251 receives an operation from the user, and outputs a UDP port number change instruction command or the like to the tunnel processing unit 260.
  • the flow entry search unit 201 extracts flow entry search condition information for searching for a flow entry from the input frame, and searches the flow entry storage unit 202 using the flow entry search condition information. As a result of the search, the flow entry search unit 201 passes the action and input frame of the matched flow entry to the flow processing unit 204. In addition, the flow entry search unit 201 updates the time-out time and statistical information of the flow entry matched at that time, if any.
  • the flow entry storage unit 202 uses a flow entry table set by the flow control device 100 and the like. The change of the flow entry in the flow entry storage unit 202 is reported to the flow control apparatus 100 and grasped. Therefore, the flow control apparatus 100 can grasp and control the behavior of the virtual switch 200.
  • the flow entry processing unit 203 updates the flow entry storage unit 202 in accordance with an operation instruction or a reference instruction such as addition / deletion regarding a flow entry coming from the flow control apparatus 100 via the flow control apparatus communication unit 205. Further, the flow entry processing unit 203 refers to the flow entry storage unit 202, deletes the flow entry that has timed out, and sends the flow entry to the flow control device 100 via the flow control device communication unit 205. Report that it has been deleted.
  • the flow processing unit 204 changes the value of the frame according to the input frame and its action passed from the flow control device 100 via the flow entry search unit 201 or via the flow control device communication unit 205, A frame is output or a frame is output to another virtual switch 200. Further, as necessary, the flow processing unit 204 instructs the VXLAN processing unit 250 to perform VXLAN encapsulation, outputs it to the VXLAN tunnel 400, performs VXLAN decapsulation of a frame input from the VXLAN tunnel 400, A frame is output to the flow control device 100 via the control device communication unit 205 or dropped.
  • FIG. 4 is a diagram illustrating a configuration of a frame that is VXLAN encapsulated by the virtual switch according to the first embodiment of this invention.
  • the tunnel processing unit 260 of the VXLAN processing unit 250 encapsulates the original frame with additional headers such as Outer MAC, Outer IP, Outer UDP, and VXLAN ID.
  • additional headers such as Outer MAC, Outer IP, Outer UDP, and VXLAN ID.
  • UDP port information numbers 601 and 602 described later are set in the Outer UDP header, which can be used for flow identification and load distribution (load balancing) using the same.
  • decapsulation processing for removing the additional header from the encapsulated frame is performed.
  • FIG. 5 is a diagram illustrating a configuration of the tunnel processing unit 260 in the virtual switch 200 according to the first embodiment.
  • a change instruction receiving unit 261 a change instruction transmitting unit 263, a VNI information storage unit 264, a tunnel release unit (decapsulation unit) 265, a UDP port information storage unit 266, and a tunneling unit ( A configuration including an encapsulation unit 267 is shown.
  • the change instruction receiving unit 261 receives the UDP port number change notification frame output from the other virtual switch 200 via the VXLAN tunnel 400.
  • the change instruction receiving unit 261 includes a change processing unit 262.
  • the change processing unit 262 does not receive a UDP port number change notification frame for instructing a change to a different UDP port number from another device for a predetermined time after receiving the UDP port number change notification frame Then, the UDP port number change process defined in the UDP port number change notification frame is executed.
  • the change processing unit 262 again performs a different UDP for a predetermined time.
  • the UDP port number changing process defined in the UDP port number change notification frame instructing the change to the different UDP port number is executed.
  • the identity of the UDP port number change notification frame can be confirmed using the value of the processing identification number field of the UDP port number change notification frame.
  • the change instruction transmission unit 263 creates a UDP port number change notification frame using the input of the UDP port number change instruction from the command processing unit 251 as a trigger.
  • the change instruction transmission unit 263 requests the tunneling unit (encapsulation unit) 267 to encapsulate the created UDP port number change notification frame, and then multicasts to all the other virtual switches 200.
  • the VNI information storage unit 264 holds a virtual network identifier (VNI) of VXLAN that the tunnel processing unit 260 has. This virtual network identifier (VNI) is stored in the VXLAN header of FIG.
  • the tunnel release unit (decapsulation unit) 265 performs decapsulation by removing an additional header from the VXLAN frame of the frame input from the VXLAN tunnel 400.
  • the UDP port information storage unit 266 holds UDP port information for the tunnel processing unit 260 to perform transmission / reception via the VXLAN tunnel 400.
  • the UDP port number held in the UDP port information storage unit 266 is changed by the change processing unit 262.
  • the UDP port information may be changed according to the UDP port number change instruction from the command processing unit 251.
  • the UDP port information storage unit 266 can be shared by a plurality of tunnel processing units 260. That is, one UDP port number can be used for a plurality of VNIs.
  • the tunneling unit (encapsulating unit) 267 When outputting to the VXLAN tunnel 400, the tunneling unit (encapsulating unit) 267 performs VXLAN encapsulation processing by adding an additional header to the original frame as shown in FIG.
  • FIG. 6 is a diagram showing an example of the configuration (format) of the UDP port number change notification frame transmitted by the virtual switch 200.
  • the UDP port number change notification frame is the same as the VXLAN encapsulated frame shown in FIG. 4, and has a configuration in which the VXLAN header portion 1001 is added to the original frame 1002.
  • a destination multicast group address for multicasting this frame is set for all virtual switches 200.
  • the original frame 1002 includes a body including an Inner MAC header and UDP port number change instruction data.
  • an identification address For the destination address (Dst MAC) and the source address (Src MAC) of the Inner MAC header, an identification address according to a predetermined rule is set. As an example, this address can be created using the virtual network identifier VNI in the VXLAN header and the destination UDP port number. For example, when the virtual network identifier VNI is “0x123456” and the UDP port number is “0xA980”, the address “0xFF123456A980” can be created by combining both. In the Ether type field, a value assigned for the UDP port number change notification frame is set.
  • the UDP port number change instruction data in the body part includes an operation code part 1701 for setting a request type such as a UDP port number change instruction, a UDP port number 1702 which is a value to be changed, and a virtual network identifier VNI value to be changed. 1703, a VNI mask 1704, a process identification number 1705, the number of transmissions 1706 for the same process identification number 1705, and the like.
  • the process identification number 1705 is a consistency within the system that is obtained by the virtual switch 200 inquiring the flow control device 100 via the flow control device communication unit 205 for each UDP port number change request. It is a certain sequence number.
  • the flow control apparatus 100 can create a unique process identification number 1705 from the initial value having a certain length (for example, 64 bits) by sequentially incrementing each time an inquiry is received.
  • 3 and 5 is realized by a computer program that causes a computer mounted on the virtual switch 200 to execute the above-described processes using the hardware thereof. You can also.
  • FIG. 7 is a sequence diagram showing the operation of the first exemplary embodiment of the present invention.
  • the virtual switch 200A requests the flow control apparatus 100 to issue a process identification number as a sequence number that is consistent within the system (step S001).
  • the change instruction receiving unit 261 is notified of the UDP port number change instruction.
  • the change instruction receiving unit 261 of the virtual switch 200A prepares to change the UDP port number by passing the UDP port number change notification in the change processing unit 262 (step S003).
  • the change instruction transmission unit 263 of the virtual switch 200A creates a UDP port number change notification frame in a format as shown in FIG. 6 and multicasts it to all virtual switches 200 in the same virtual network (step S004). .
  • a value indicating a UDP port number conversion processing request is set in the operation code portion 1701 in the body of the UDP port number change notification frame, and the port number after change 65000 is set in the UDP port number 1702. Is set.
  • step S002 “1” is set in the VNI value 1703, the value 0xFFFFFF indicating that all the bits of the VNI value match is set in the VNI mask 1704, and the process identification number 1705 is flowed in step S002.
  • the process identification number acquired from the control device 100 is set.
  • the number of transmissions 1706 may be increased by setting the initial value to “0”, or the initial value may be subtracted as the specified number of transmissions.
  • the UDP port number change notification frame is transmitted by UDP connectionless communication, considering the possibility of loss, a predetermined number (for example, 10 times) while incrementing the number of transmissions. It is assumed that the UDP port number change notification frame is repeatedly transmitted.
  • the change processing unit 262 of the virtual switch 200A that has received the UDP port number change notification and is ready to change the UDP port number has issued a value with a larger processing identification number from another virtual switch 200 for a predetermined period, that is, a newer issue. If the received UDP port number change notification frame is not received, the number of the UDP port information storage unit 266 is changed from 60000 to 65000 (step S005a).
  • the multicast UDP port number change notification frame is received by the change instruction receiving unit 261 of the virtual switches 200B and 200C and transferred to the change processing unit 262 of each virtual switch 200B and 200C.
  • the change processing unit 262 of the virtual switches 200B and 200C does not receive a value with a large processing identification number, that is, a newly issued UDP port number change notification frame from another virtual switch 200 for a predetermined period.
  • the number of the UDP port information storage unit 266 is changed from 60000 to change 65000 (steps S005b and S005c).
  • the UDP port number of all virtual switches 200 in the system can be changed at once by multicast transmission of a UDP port number change notification frame requesting the change of the UDP port number.
  • the UDP port number change notification frame is multicast to all the virtual switches 200, and the UDP port number change process is performed all at once after a predetermined time. As a result, operational costs can be reduced, and the time for communication interruption can be shortened.
  • a layer 3 network capable of multicasting is set by setting a multicast address as a destination in the VXLAN header, but forwarding is performed hop-by-hop. It can also be used in an open flow network.
  • a physical switch having a VXLAN tunnel endpoint function can be used instead of the virtual switch 200.
  • the transmission of the UDP port number change notification frame may not be performed by the virtual switch 200 but may be entrusted to a multicast server for distribution to an external virtual network node via an overlay tunnel.
  • the UDP port number change instruction may receive not only a user instruction via the command processing unit 251 but also a UDP port number change instruction from the flow control apparatus 100.
  • the flow control apparatus 100 may transmit an output request for a UDP port number change notification frame.
  • the flow control device 100 stores the association between the virtual network identifier VNI and the UDP port number when assigning the process identification number. In this way, when the virtual switch 200 is added, it is possible to perform consistent settings for the added virtual switch 200 as well.
  • the UDP port number for receiving the UDP port number change notification frame may be a fixed value.
  • the UDP port number change notification frame distribution may be broadcast instead of multicast.
  • the virtual switch has been described as having a function as an OpenFlow switch.
  • the present invention can be realized even when an overlay network is realized by means other than OpenFlow.
  • the processing identification number may be created by a device other than the flow control device 100. Further, a value representing the priority order of the UDP port number change notification frame may be set as the process identification number. In this case, a higher priority UDP frame number change notification frame is given priority rather than the latest UDP port number change notification frame.
  • the change processing unit is a switch that determines the predetermined period using time information included in an instruction to change the flow identification information.
  • the switch of the first or second form When the change processing unit receives an instruction to change the flow identification information having different contents before the predetermined period has elapsed, the switch executes an arbitration process between the change instructions for the flow identification information based on a predetermined rule. .
  • the change instruction transmission unit obtains identification information for uniquely specifying the flow identification information change instruction from a predetermined control device, and embeds it in the flow identification information change instruction
  • the change processing unit is a switch that performs identification of a change instruction of flow identification information and arbitration processing based on the identification information.
  • the switch for changing the flow identification information is exchanged by a frame of a predetermined format encapsulated by the tunnel processing unit.
  • the flow identification information is a switch that is a UDP (User Datagram Protocol) port number.

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Abstract

La présente invention améliore une fonction de changement de configuration de tunnel d'un commutateur qui fonctionne comme un point d'extrémité de tunnel d'un système de réseau superposé. Un commutateur, qui fonctionne comme un point d'extrémité de tunnel d'un réseau superposé, comprend : une unité de traitement de tunnel qui réalise une encapsulation et une désencapsulation de trames transmises/reçues depuis un point d'extrémité de tunnel opposé ; une unité de réception d'instruction de changement qui reçoit une instruction de changement d'informations d'identification de flux permettant d'identifier des trames encapsulées ; et une unité de traitement de changement qui, à condition qu'un intervalle de temps donné se soit écoulé depuis la réception de l'instruction de changement d'informations d'identification de flux, change les informations d'identification de flux qui doivent être utilisées par l'unité de traitement de tunnel.
PCT/JP2015/074257 2014-08-28 2015-08-27 Commutateur, système de réseau superposé, procédé et programme de changement de configuration de tunnel WO2016031923A1 (fr)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
US11005752B2 (en) 2016-08-11 2021-05-11 New H3C Technologies Co., Ltd. Packet transmission

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JP5437518B2 (ja) * 2013-07-08 2014-03-12 エヌ・ティ・ティ・コミュニケーションズ株式会社 仮想ネットワークシステム、構成変更方法、トンネル終端装置、トンネル接続装置、及びプログラム
US20140092907A1 (en) * 2012-08-14 2014-04-03 Vmware, Inc. Method and system for virtual and physical network integration

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JP2006135945A (ja) * 2004-10-04 2006-05-25 Nec Corp パス設定装置、パス設定システム、及び、それらのパス設定方法
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JP5437518B2 (ja) * 2013-07-08 2014-03-12 エヌ・ティ・ティ・コミュニケーションズ株式会社 仮想ネットワークシステム、構成変更方法、トンネル終端装置、トンネル接続装置、及びプログラム

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