KR20120068278A - The overlay network based on dynamic circuit using virtual router - Google Patents

Abstract

PURPOSE: Dynamic circuit-based overlay network setup method and structure using a virtual router are provided to maximize the applicability of existing network resources by forming various overlay networks based on the virtual router. CONSTITUTION: High-speed switches(110) are composed of a device with various transmission layers. A virtual router(111) operates and sets-up a routing table. A GMPLS-based controlling plane(120) controls the transmission planes of the switches. A path computation engine(PCE) block(130) efficiently calculates the path of the controlling plane. A management block is further prepared.

Description

The overlay network based on dynamic circuit using virtual router

The present invention relates to a network system.

The present invention is to design a new routing method and structure using resources provided in a virtual network environment, more specifically, GMPLS of the control plane capable of supporting a multi-transport layer, LSP path, LSP path formed using the same The following describes a method and structure for configuring an overlay network based on a dynamic circuit by using a virtual router based on virtualization to provide routing between networks.

In the existing backbone, the MPLS-VPN method has been widely used to form the path to the MPLS-based LSP. However, as today, the number of devices for accessing the Internet is increasing, and due to the popularization of smart phones, network traffic is increasing rapidly. This necessitated the need to update existing networks to provide bandwidth close to 100 gigabytes. For this, optical network based networks such as DWDM and SONET are required. GMPLS is a protocol that can be configured for circuit-based networks other than the packet layer. This conventional GMPLS is an LSP-based route establishment method that establishes an end-to-end route. However, such an end-to-end routing method reduces the overall utilization of network resources, and it is impossible to configure various overlay networks.

Therefore, this article provides a structure in which various overlay networks can be configured by using a virtual router, not based on end-to-end routing in a GMPLS-based network, to maximize the utilization of existing network resources. And, we propose a method for constructing a variety of dynamic overlay network.

The technical problem to be achieved by the present invention is to provide a structure that can be configured in a variety of overlay networks using a virtual router, rather than the end-to-end routing in the GMPLS-based network as described above, to maximize the utilization of the existing network resources In addition, various overlay network networks can be configured.

In order to achieve the above object, the present invention provides a control plane of GMPLS technology; A high bandwidth switch managed by the control plane; In addition to the virtualization-based router for providing the routing function between the LSP and the path computing engine (PCE) for providing a path calculation result on the control plane.

As described above, the dynamic circuit based overlay network configuration technique using the virtual router presented in the present invention provides a dynamic overlay network using a GMPLS-based LSP and a virtual router for routing between them. In this way, it is possible to provide separate network links using the LSP, and by providing a router that enables routing between them through virtualization, it is possible to provide a virtual network in which network resources are actually separated. The virtual network thus formed can provide various services by utilizing LSPs formed to meet the quality of service (Qos) required by the network subscriber and routing between them.

In addition, the present invention is to separate the control plane and data plane using GMPLS, the control plane utilizes a virtual router, it is possible to develop a new routing protocol according to the user's needs, the control plane simply provides a high bandwidth This allows a perfect separation between software and hardware.

1 is a screen showing the structure of an overlay network configuration system based on a dynamic circuit using a virtual router according to the present invention.
2 is a flowchart illustrating a procedure for establishing an end-to-end LSP path according to the present invention.

In order to achieve the above object, the method of the present invention includes a first step of receiving a path request of the LSP; Extracting a start address and a destination address of the received LSP to extract an ERO (Explicit Route Object) object of the corresponding LSP; A third step of setting a new LSP set if the corresponding LSP set does not exist as a result of the second step determination; A fourth step of operating a virtual router for routing between LSPs when the set of LSPs comprises a plurality of LSPs; And a fifth step of setting the set of corresponding LSPs as a forwarding plane.

Hereinafter, with reference to the accompanying drawings will be described in detail the specific flow of the present invention.

1 illustrates a structure of a system for providing a virtualization-based hierarchical virtual network service according to the present invention.

Dynamic circuit based overlay network configuration system using a virtual router according to the present invention, as shown in Figure 1, ultra-fast switches 110 consisting of equipment of various transmission layers for ultra-fast forwarding, and such (110) The GMPLS-based control plane 120 for controlling the transport plane of the switches of the virtual routers 111 and 110, which can operate and set up a routing table when needed as an upper layer of switches, and such a control plane It supports signaling processes through traffic engineering such as OSPF-TE and RSVP-TE. And to manage the set of LSPs formed by GMPLS and PCE (130) and Path Computation Engiene (130) to provide efficient routing based on traffic engineering on systems that can dynamically provide circuit-based overlay networks. It characterized in that the management block 140 is provided. The system of the present invention as described above is a system that provides an ultra-high speed overlay network by providing an LSP path dynamically when a user's request is required through a GMPLS-based signaling process, and providing routing between LSPs using a virtual router. Is summarized. In other words, the general switch system is separated based on packet and circuit, so that the transport layer to support the high-speed network is separated. PCE is also used to provide a variety of dynamic, high-speed overlay networks, even in circuit-based, packet-based approaches. The overlay network thus provided can satisfy various Qos through a signaling process, and provide various overlay networks utilizing a virtual router away from the network structure providing only a limited ring structure in the optical communication base. In addition, the ultra-high speed overlay network can provide a new network service paradigm by interworking with various services such as cloud services.

FIG. 2 is a flowchart illustrating a procedure for setting an LSP path according to the state of various LSP sets when a request for LSP path setting is received in a dynamic circuit based overlay network configuration system using a virtual router according to the present invention. .

As shown in FIG. 2, when the LSP setting request is received from the control plane 120 of the dynamic circuit based overlay network setting system utilizing the virtual router of the present invention (S100), it is used for the upper PCE 120. A set of possible LSPs is requested (S101). The PCE 120 searches for a set of available LSPs (S102).

If it is determined in step S102 that there is a set of available LSPs, the process proceeds to a step for setting the set of LSPs. If there is no set of available LSPs, the ERO object according to the requested LSP information is determined. It is extracted (S104).

If it is determined whether there are LSPs that are interlinked in advance among the ERO objects, that is, reusable LSPs (S105), and if the reusable LSPs exist as a result of the determination, it is determined whether the LSPs in the remaining sections can be set (S107). If there is no reusable LSP at all, as a result of the determination, it is determined whether the path of the end-to-end LSP can be set (S106).

If it is determined in S106 that there is no path that satisfies the corresponding LSP request, a failure occurs, and if there is a satisfactory impairment, the LSP set is formed (S108).

If it is determined in step S107 that the LSP path can be set between the remaining objects, a corresponding set of LSPs is formed (S108).

If it is determined in step S102 that there is a set of usable LSPs, it is determined whether the set of LSPs consists of a plurality of LSPs (S103).

If it is determined in step S103 that the LSP is composed of a plurality of LSPs, routing between the LSPs is necessary. To this end, extract the VLAN number for each LSP (S110), operate the virtual router for each intersection switch (S111), and update the virtual router to perform VLAN switching based on the VLAN number information extracted from S110 (S112). .

After all control plane data is updated by step S112, the forwarding table of the corresponding switches is updated through the RSVP-TE signaling protocol based on this information (S109). Then, by assigning the VLAN number of the LSP of the starting point of the LSP path to the user, the user can enter the network (S110).

110: multiple transport layer switches providing ultra-fast forwarding
111: Dynamically operating virtual router contained in switch on 110
120: control plane providing GMPLS-based signaling process
130: PCE block for calculating the path setting in the control plane
140: block for managing a set of LSPs

Claims (10)

A high speed multiple transport layer switch including a dynamically operating virtual router;
GMPLS based control plane;
A PCE block for providing an efficient path computation to the control plane; And
Management block
Dynamic circuit-based overlay network configuration system using a virtual router characterized in that it comprises a. The method of claim 1,
A switch is a switch that covers not only IP-based packet switches but also various multi-layer switches such as SONET and DWDM. Unlike a conventional optical switch, a switch enables physical forwarding through a plurality of ports so that the existing ring structure In addition to networks, switches provide networks of various mesh structures. The method of claim 1,
The GMPLS-based control plane provides the network status information to the LSP management system through the interface block for communicating with the LSP management system of Clause 1 on the control plane using the existing RSVP-TE and OSPF-TE-based traffic engineering. A system that, afterwards, instructs to form a path, when it actually needs to set the path to the LSP. The method of claim 1,
A switch is a system that can dynamically create a virtual router using virtualization technology. The lower forwarding layer of the switch is a high-speed physical layer that provides high-speed forwarding performance through routing on the physical layer when no virtual router is needed, and only when the routing information is needed. A system that updates routing tables at the physical layer. The method of claim 4, wherein
A virtual router is a virtual router that climbs on a plurality of virtual machines formed on a switch. The separation between these virtual routers is separated through the internal VLAN, and when it goes up from the lower physical layer to the upper virtual router layer, it is raised based on the VLAN information of the packet. The method of claim 4, wherein
Virtual routers can be created and removed dynamically by a GMPLS-based control plane. In addition, the routing protocol is a programmable virtual router that can provide various functions according to the user defined protocol as well as the existing routing protocol. The method of claim 1,
The management block is a block for efficiently managing network resources managed by the GMPLS-based control plane. This enables the integration of LSP sets, virtual routers, and switches that provide mesh-based networks, as well as existing end-to-end LSP connections, to provide a dynamic circuit-based overlay network. The method of claim 1,
The management block monitors the resource status of the network, updates the status of the LSP set, and manages the routing table of the virtual router through the interface with the GMPLS-based control plane of claim 3. The method of claim 8,
The management block always sets the state of all networks through a GMPLS-based control plane. As a result, even if the type and number of equipment to be managed by the control plane increases, only the control plane needs to be updated, so the management block does not need to know the specification information of all the devices. The method of claim 1,
The PCE block is a block for calculating a path of a requesting LSP and performs bandwidth-centric path calculation by a Constrained Shortest Path First (CSPF) method. However, the PCE block in this article is a computational block that can consider not only bandwidth but also limit variables that are applied differently according to various network services such as delay, jitter, and bandwidth.

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