KR101404491B1 - System and Method for dynamic bandwidth setting of subnet based on OpenFlow network - Google Patents

Abstract

The present invention relates to a system and a method for setting a dynamic bandwidth of subnets based on an openflow network. The system comprises a portal management apparatus for setting a queue/bandwidth in each interface of openflow (OF) nodes, in which a sharing link is included, based on topology information and virtual local area network (VLAN) information transmitted from an openflow network control apparatus when sharing link usage time information of a VLAN unit and requirement information for a network usage pattern are inputted; and an openflow network control apparatus for collecting the topology information and the VLAN information for the OF nodes to transmit the collected information to the portal management apparatus and for dynamically setting a bandwidth of each subnet by reflecting a VLAN priority code point (PCP) field in packet-in openflow messages based on the requirement information for the network usage pattern transmitted from the portal management apparatus.

Description

TECHNICAL FIELD [0001] The present invention relates to a dynamic bandwidth setting system and a dynamic bandwidth setting subnet based on an open flow network,

The present invention relates to a dynamic bandwidth setting system and method for a subnet based on an open flow network. More particularly, the present invention relates to a system and method for setting a dynamic bandwidth The present invention relates to an open-flow network-based dynamic bandwidth setting system and method for dynamically setting a bandwidth for each subnet using an area network priority code point (SFN) field.

OpenFlow technology is a technology standard for testing new protocols on real networks. OpenFlow technology allows network protocols to be tested while maintaining existing applications.

A network system with open flow technology includes an open flow protocol that provides flow table, controller, and inter-switch communication security. The flow table is built into the switch and defines rules for how to handle packets and traffic. A controller is a kind of command computer that controls an open-flow system and communicates with the switch using a specially defined open-flow protocol. This protocol is encrypted by Secure Socket Layer (SSL).

An open-flow system provides an API (Application Programming Interface) that can be used to issue commands to switches, routers, or network controllers. Engineers can define their own protocols using this API. For example, simple traffic can be defined by a given IP address.

According to this command, the controller can set the path through the optimized network using the network knowledge information.

However, conventionally, when connecting the access network and the backbone network, it is difficult to guarantee the service quality per subnet at a specific time by using the physically shared uplink, and in the case of selectively using the QoS function of the network node, There was a drawback.

In addition, there is a problem that a packet bottleneck occurs at a specific time zone by using the physically shared uplink.

Korean Patent Laid-Open No. 10-2012-0139824: Method of controlling switch and flow table

SUMMARY OF THE INVENTION The present invention has been conceived in order to solve the above problems, and an object of the present invention is to provide a method and apparatus for managing a bottleneck expected area according to a network utilization pattern and a reservation time inputted by an administrator in an open- The present invention provides a dynamic bandwidth setting system and method for a subnet based on an open flow network, which can efficiently manage a bandwidth of a shared link by dynamically allocating differentiated priorities to subnets.

According to one aspect of the present invention, when requirement information for a network usage pattern is input based on topology information and Vlan (virtual local area network) information transmitted from an open-flow network control apparatus, Collects topology information and Vlan information for OF nodes, and transmits the collected portal information to the portal management apparatus, and transmits the collected portal information to the portal management apparatus, An open flow network including an open-flow network control device that dynamically sets a bandwidth for each subnet by reflecting a Vlan pcp (priority code point) field in packet-in open flow messages based on the requirement information on the network utilization pattern A dynamic bandwidth setting system for each subnet is provided.

The requirement information for the network utilization pattern may include at least one of a required bandwidth for each Vlan ID, a shared link use reserved time information for each Vlan, a designated OF node, and a Tagged port number of a designated OF node.

The portal management apparatus may set a queue / bandwidth of each OF node by reflecting a Guaranteed Minimum Bandwidth (GMB) scheduling policy provided by each OF node to which the shared link belongs.

The open-flow network control apparatus obtains basic configuration information for each node through open-flow feature messages and transmits LLDP (Link Layer Discovery Protocol) messages to OF nodes in the form of a packet-out message, Monitor the connection status, generate topology information for the open flow access network based on the connection status between the monitored OF nodes, and transmit the topology information to the portal management apparatus.

Also. The open flow network control apparatus collects and stores Vlan information including at least one of Vlan ID and interface information registered per OF node through SSH (Secure SHell) connection to each OF switches To the portal management apparatus.

According to another aspect of the present invention, there is provided a network management system comprising: a requirement information database storing requirement information for a network utilization pattern, queue / bandwidth information determined for each OF of nodes to which a shared link belongs, a Vlan information database storing Vlan information, (LLDP) messages to the OF nodes in the form of a packet-out message to monitor the connection status between the OF nodes, and the monitored OF A topology information providing module for generating topology information on the open flow network based on the connection state between the nodes and transmitting the topology information to the portal management device, a Vlan ID registered for each OF node through SSH (Secure SHell) connection to each OF switch, Vlan information including at least one of the interface information is collected and stored in the Vlan information database A Vlan information providing module for transmitting the Vlan information to the portal management apparatus at the same time, a Vlan pcp field for the packet-in open flow messages based on the requirement information on the network usage pattern stored in the requirement information database, There is provided an open flow network control apparatus including a Vlan pcp field setting module for dynamically ensuring bandwidth, and an OF message processing module for generating a flow table to be applied to OF nodes and transmitting the flow table to OF nodes.

The requirement information for the network utilization pattern may include at least one of a required bandwidth for each Vlan ID, a shared link use reserved time information for each Vlan, a designated OF node, and a Tagged port number of a designated OF node.

The OFDMA information management module includes: an OF node information management unit for obtaining basic configuration information for each OF node through Open Flow Feature messages; an LLDP message management unit for managing, based on the basic configuration information of OF nodes acquired from the OF node information management unit, To the OF nodes in the form of a Packet-out message to monitor the connection status between the OF nodes and acquire the connection status between the monitored nodes, And a topology management unit for structuring the topology information for the open flow network using the connection state and transmitting the structured topology information to the portal management apparatus.

The Vlan information providing module collects Vlan information including at least one of Vlan ID and interface information registered for each OF node through an SSH (Secure SHell) connection to an OF switch, stores the Vlan information in the Vlan information database, A bandwidth setting unit configured to set a bandwidth for each OF-node based on the bandwidth information stored in the requirement information database and the Vlan information acquired by the Vlan information acquisition unit.

The Vlan pcp field setting module includes a Vlan pcp field setting unit for reflecting a Vlan pcp field for packet-in open flow messages based on requirement information for a network usage pattern stored in the requirement information database, And a timer management unit for dynamically changing and assigning the Vlan pcp top priority according to the designated shared link use reserved time.

The Vlan pcp field setting unit adds a "set_vlan_pcp" action to the Tagged port, in addition to the output port number specifying action, among the ports occupied by the designated Vlan ID arriving at the shared link use reservation time among the bottleneck region node groups, Among the bottleneck area node groups, among the ports occupied by the non-assigned Vlan IDs that fall outside the category of the shared link utilization reservation time, the Tagged port is allocated to the output In addition to the action specifying the port number, you can assign a default priority to the flows through the "set_vlan_pcp" action.

The Vlan pcp field setting unit may designate only the output port number for forwarding the flows for all ports of the non-bottleneck region node group and untagged ports of the bottleneck region node group.

According to another aspect of the present invention, the portal management apparatus transmits, to the open flow network control apparatus, information on the network usage pattern and the shared link utilization time information in units of Vlan based on the topology information and the Vlan information transmitted from the open- Setting the queue / bandwidth information for each port of the OF nodes to which the sharing link belongs, and transmitting the set queue / bandwidth information to the open-flow network control apparatus; and the open- There is provided a dynamic bandwidth setting method for each subnet based on an open flow network including a step of dynamically setting a bandwidth for each subnet by reflecting a Vlan pcp field in packet-in open flow messages based on the requirement information on a usage pattern .

In the dynamic bandwidth setting method for each subnet based on the open flow network, the open flow network control apparatus may further include collecting topology information and Vlan information about OF nodes and transmitting the collected topology information and Vlan information to the portal management apparatus.

The requirement information for the network utilization pattern may include at least one of a required bandwidth for each Vlan ID, a shared link use reserved time information for each Vlan, a designated OF node, and a Tagged port number of a designated OF node.

According to the present invention, it is possible to efficiently manage the bandwidth of the shared link by dynamically allocating priorities differentiated according to subnets in the bottleneck anticipated time zones according to the network usage pattern and the reservation time input by the administrator in the open flow network environment.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating a dynamic bandwidth setting system for each subnet based on an open flow network according to an embodiment of the present invention; FIG.
2 is a block diagram schematically showing a configuration of a portal management apparatus according to an embodiment of the present invention.
3 is a block diagram schematically showing the configuration of an open-flow network control apparatus according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating a method for setting a dynamic bandwidth per subnet based on an open flow network, according to an embodiment of the present invention; FIG.

The foregoing and other objects, features, and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

1 is a diagram illustrating a dynamic bandwidth setting system for each subnet based on an open flow network according to an embodiment of the present invention.

Referring to FIG. 1, a dynamic bandwidth setting system for each subnet based on an open flow network includes a plurality of OF (OpenFlow) nodes 320 for transmitting and receiving data, an OF switch 310 for relaying flow transmission / reception between OF nodes 320, An open flow network control device 200 that receives flow information from the OF switch 310 and controls the routing of the flow, and the portal management device 100.

When the requirement information for the network usage pattern is input based on the topology information and the Vlan information transmitted from the open-FL network control device 200, Set the queue / bandwidth as a star.

A detailed description of this portal management apparatus 100 will be given with reference to FIG.

The open-flow network control apparatus 200 sets a Vlan pcp (priority code point) field to dynamically secure the network service quality based on the request information and the reservation time for the network utilization pattern transmitted from the portal management apparatus 100 To guarantee exclusive bandwidth in a certain time zone by subnet.

The open-flow network control apparatus 200 obtains basic configuration information for each OF-nodes through the open flow feature messages and transmits LLDP (Link Layer Discovery Protocol) messages to OF (OpenFlow) nodes in a packet- And transmits the generated topology information to the portal control apparatus 100 based on the connection state between the monitored OF nodes and generates topology information for the open flow access network 300. [

The open-flow network control apparatus 200 collects Vlan information including at least one of Vlan ID, interface information (Tagged Untagged) registered for each OF node through SSH connection to each OF (OpenFlow) switches 310 And transmits it to the portal management apparatus 100 at the same time.

The open flow network control apparatus 200 reflects the Vlan pcp field in the packet-in open flow messages based on the requirement information on the network usage pattern transmitted from the portal management apparatus 100. [

The open-flow network control apparatus 200 generates the forwarding path for the flow by reflecting the flow information received from the switch 310 and the user's request. The open-flow network control apparatus 200 transmits the generated forwarding path to the OF switch 310 in the form of a flow entry.

The open-flow network control apparatus 200 monitors the OF switch 310 in the open-flow network 300 and dynamically sets a transmission path to the switch 310 in the open-flow network 300 according to communication conditions. The open-loop network control apparatus 200 registers the flow on the OF switch by creating a flow table using the open-flow protocol message. Here, the flow defines a predetermined process (action) to be performed on a packet conforming to a predetermined rule. The rules of the flow are defined by various combinations of any or all of the destination address, the source address, the destination port, and the source port included in the header area of the frame carrying the packet, and the rule is identifiable. It should be noted that the above address includes a MAC address (Media Access Control Address) and an IP address (Internet Protocol Address). In addition to the above, information of an ingress port can also be used as a rule of a flow.

The flow table stores data (flow entries) of flows for each OF switch.

The OF switch 310 receiving the flow entry manages the subsequent traffic based on the forwarding rule included in the entry. The flow entry includes a header field including destination / source MAC, IP, service port number, and the like, and an action field for performing forwarding to the designated port.

As an example of the open-flow network control apparatus 200, computers such as a PC (personal computer), an appliance, a workstation, a mainframe, and a supercomputer are good examples. In addition, the open-loop network control apparatus 200 is also suitable for a virtual machine (VM) environment built on a physical machine.

A detailed description of the open-flow network control apparatus 200 will be given with reference to FIG.

OF switch 310 performs packet transmission according to the created flow table.

The OF switch 310 stores the data received from the transmitting-side OF node in the buffer, and then transmits information about the requested flow to the open-flow-network controller 200 side. At this time, information exchange for flows is performed using an open flow protocol.

As an example of the OF switch 310, a network switch is assumed. The network switch may be an L3 switch, a L4 switch, an L7 switch / application switch (layer 7 switch), or a multi-layer switch. In addition, examples of the switch 20 include a router, a proxy, a gateway, a firewall, a load balancing device, a band control device, a security monitoring and control device, a base station, A computer having a port, and the like are exemplified.

Upon communication between the OF node 320, the transmitting OF node requests communication to the receiving OF node to be connected to the OF switch 310 side.

2 is a block diagram schematically showing a configuration of a portal management apparatus according to an embodiment of the present invention.

Referring to FIG. 2, the portal management apparatus 100 includes an authentication unit 110 and a network usage pattern input unit 120.

The authentication unit 110 performs manager authentication using the authentication information input from the administrator. Here, the authentication information may include an ID / password, an authentication key, etc., and the authentication unit 110 confirms whether the authentication information input by the administrator is the previously registered information, and performs the administrator authentication. That is, when the authentication information is the registered information, the authentication unit 110 determines that the user is an authenticated administrator, and if the authentication information is not registered, the authentication unit 110 can determine that the user is an unauthenticated administrator.

The network usage pattern input unit 120 sets up a queue / bandwidth for each OF node to which the shared link belongs based on the topology information and the Vlan information, when the requirement information for the network usage pattern is input from the authorized administrator. That is, the network usage pattern input unit 120 receives the requirement information for the network usage pattern from the authorized administrator. Here, the requirement information for the network usage pattern may include a required bandwidth per Vlan ID (i.e., subnet), a service quality assurance time zone, a designated OF node, a Tagged port number of a designated OF node, and the like. The service quality assurance time zone may refer to a shared link utilization reservation time information (i.e., a reservation time) in units of Vlan (subnet), and a Tagged port number of a designated OF node may include a port number to which a shared link belongs It can mean.

The network usage pattern input unit 120 obtains topology information on the open-flow network to be managed from the topology management unit of the open-flow network control apparatus. In addition, the network usage pattern input unit 120 obtains Vlan information including designated OF nodes constituting the network, Tagged port number of the designated OF node, and Vlan ID for each OF node from the open-flow network control apparatus.

The manager inputs a time zone in which the shared link can be used exclusively for each subnet that is mapped to each Vlan ID through the topology information and Vlan information obtained through the network usage pattern input unit 120. The network usage pattern input unit 120 The queue / bandwidth information is set for each interface of the OF nodes to which the sharing link belongs. At this time, the network usage pattern input unit 120 sets the queue / bandwidth information reflecting the scheduling policy provided by the target OF node. That is, the network usage pattern input unit 120 targets network nodes that provide a Guaranteed Minimum Bandwidth (GMB) policy that guarantees a minimum bandwidth for a plurality of queues existing in each physical interface. The GMB scheduling policy is utilized If all bandwidth is allocated to the highest priority queue, other traffic placed in the queue of the next highest priority will not be able to invade the traffic assigned to the highest priority queue.

As described above, the network usage pattern input unit 120 sets guarantee bandwidths for the respective queues for the ports belonging to the shared link, taking into consideration the scheduling policy of the OF node. For example, when it is desired to guarantee all the bands of the shared link for a subnet belonging to a specific Vlan ID, for each of the eight queues corresponding to the pcp field, {100,0,0,0,0,0,0,0} . These inputs are stored in the requirements information DB of the open-flow network control device and reflected in the open-flow network. Here, the pcp field may conform to the IEEE 802.1p standard.

3 is a block diagram schematically illustrating the configuration of an open-flow network control apparatus according to an embodiment of the present invention.

3, the open-flow network control apparatus 200 includes a requirement information database 210, a Vlan information database 220, a topology information providing module 230, a Vlan pcp field setting module 240, Module 250, and an OF message processing module 260.

The requirement information database 210 stores requirements information on the network usage pattern and queue / bandwidth information determined for each OF-node interface to which the shared link belongs. Here, the requirement information for the network usage pattern may include a required bandwidth per Vlan ID, a service quality assurance time zone, a designated OF node, a Tagged port number of a designated OF node, and the like.

The Vlan information database 220 stores Vlan information. That is, the Vlan information database 220 stores Vlan information including Vlan ID information, interface information (Tagged, Untagged) registered for each OF node through an SSH connection to each OF switches. The information stored in the Vlan information database 220 is provided to the portal management device so that the network manager can grasp the shared link information and determine the interfaces to which the queue / bandwidth information is set.

The topology information providing module 230 acquires basic configuration information for each OF node through open flow feature messages and transmits LLDP (Link Layer Discovery Protocol) messages to the OF nodes in the form of a packet-out message, And generates topology information for the open flow network based on the connection state between the monitored OF nodes and transmits the topology information to the portal management apparatus.

The topology information providing module 230 includes an OF node information managing unit 236, a link information obtaining unit 234, and a topology managing unit 232.

The OF node information management unit 236 obtains the basic configuration information for each OF node through the open flow feature messages. The Open Flow Feature message conforms to the Open Flow Protocol standard specification, and provides information on the capabilities (capability values) supported by the OF nodes. The information includes whether flow / port statistical information is supported, And the like.

The link information acquisition unit 234 transmits LLDP (Link Layer Discovery Protocol) messages to the OF nodes in the form of a packet-out message based on the basic configuration information of the OF nodes acquired by the OF node information management unit 236, Monitors the connection state between the nodes, and acquires the connection state between the monitored OF nodes. That is, when an LLDP message transmitted in the form of a packet-out message is broadcasted to neighboring OF nodes, OF nodes receiving an LLDP message do not have a flow table for processing the packet, And transmits the packet-in message to the open-flow network control device. The open-flow network control device, which has received the packet-in message, can determine whether the OF-nodes are connected based on the packet-in message.

The topology management unit 232 structures the topology information of the open flow network using the connection state between the OF nodes obtained by the link information obtaining unit 234 and transmits the structured topology information to the portal management apparatus.

The Vlan information providing module 250 collects Vlan information including Vlan ID, Tagged Information, Untagged, and the like registered for each OF node through an SSH (Secure SHell) connection to each OF switch, And transmits the same to the portal management apparatus.

The Vlan information providing module 250 includes a queue / bandwidth information setting unit 252 and a Vlan group information obtaining unit 254.

Vlan group information acquisition unit 254 collects Vlan information including Vlan ID, interface information (Tagged, Untagged) registered for each OF node through SSH (Secure SHell) connection to the OF switch, And transmits the same to the portal management apparatus. That is, the Vlan group information obtaining unit 254 can obtain the Vlan ID information, the tag information, and the untagged information registered for each OF node by reading and parsing the Vlan ID and interface information from the OF switch.

The queue / bandwidth information setting unit 252 sets the queue / bandwidth according to the interface of each OF node based on the queue / bandwidth information stored in the requirement information database 210 and the Vlan information obtained by the Vlan group information obtaining unit 254 Setting. That is, the first packets flowing into the open flow network are delivered to the open flow network control apparatus based on the operation method of the open flow network, and corresponding flow tables are allocated. During this process, the tagged ports belonging to the shared link are allocated the highest priority queue during the reservation time, reflecting the requirements information of the network usage pattern transmitted from the portal management device.

The Vlan pcp field setting module 240 reflects the Vlan pcp field for the packet-in open flow messages based on the requirement information on the network usage pattern stored in the requirement information database 210, .

The Vlan pcp field setting module 240 includes a Vlan pcp field setting unit 244 and a timer management unit 242.

The Vlan pcp field setting unit 244 reflects the Vlan pcp field for the packet-in open flow messages based on the requirement information for the network usage pattern stored in the requirement database 210. [ The action of setting the Vlan pcp field is configured in the OF message processing module 260 as a flow table including the addition of "set_vlan_pcp" operation and is transmitted to OF nodes.

A method for the Vlan pcp field setting unit 244 to reflect Vlan pcp fields for packet-in open flow messages will be described in more detail.

OF nodes belonging to the open flow network can be classified into bottleneck nodes and non-bottleneck nodes. In addition, from the viewpoint of the physical interface of each OF node, it is possible to classify the tagged port belonging to the shared link and the untagged port as the non-designated Vlan group designated by the reserved time of the manager's shared link Can be classified. Considering these classification perspectives, it is possible to reclassify for action generation according to node group / port combination. Therefore, the Vlan pcp field setting unit 244, among the bottleneck area node groups, among the ports occupied by the designated Vlan ID that has arrived at the shared link use reservation time, the Tagged port is additionally provided with a "set_vlan_pcp" action To allow the flows to be assigned the highest priority number. The highest priority number thus allocated is mapped to a guarantee bandwidth preset for the flows. Among the bottleneck node group, among the ports occupied by the unspecified Vlan IDs that fall outside the reserved time category, the Tagged port has a default action (default) for the corresponding flows through the "set_vlan_pcp" action in addition to the general action for specifying the output port number. Best effort "service by assigning rankings. In addition, for all ports of the non-bottleneck region node group, only the output port number for forwarding flows is specified without any additional action, and since untagged ports of the bottleneck node group are not passed through the shared link, Only the output port number for the forwarding of the packet.

The timer management unit 242 adjusts the Vlan pcp priority order to be dynamically changed and allocated according to the reservation time designated for each Vlan ID (per subnet).

OF message processing module 260 performs processing and corresponding functions for the open flow protocol.

OF message processing module 260 generates a flow table to be applied to the OF nodes and transmits the generated flow table to the OF nodes. That is, the OF message processing module 260 specifies an output port number to which packets related to the flow table are to be transmitted. In this case, an action to set the Vlan pcp field is additionally specified.

Finally, the flow tables thus transmitted are reflected in respective OF nodes, and packets transmitted thereafter can dynamically set / release the Vlan pcp field according to the Vlan ID based on the reservation time set by the network manager, A certain bandwidth can be guaranteed.

4 is a flowchart illustrating a method for setting a dynamic bandwidth per subnet based on an open flow network according to an embodiment of the present invention.

Referring to FIG. 4, the portal management apparatus receives the requirement information on the network usage pattern based on the topology information and the Vlan information for the open flow network (S402). Here, the requirement information for the network usage pattern may include the requested bandwidth for each Vlan ID, the reserved link utilization time information for Vlan units, the designated OF node, the Tagged port number of the designated OF node, and the like.

Then, the portal management apparatus sets a queue / bandwidth for each port of the OF nodes to which the shared link belongs based on the requirement information on the network usage pattern (S404).

Then, the portal management apparatus not only stores the requirement information of the network usage pattern and the set queue / bandwidth information, but also transmits it to the open-flow network control apparatus (S406).

Thus, those skilled in the art will appreciate that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

The present invention relates to a method and apparatus for dynamically allocating priorities differentiated according to subnets to bottleneck anticipated areas according to a network utilization pattern and a reservation time inputted by an administrator in an open flow network environment composed of Vlan and sharing an uplink, The present invention can be applied to an open-flow network-based subnet-specific dynamic bandwidth setting system and method that enables efficient management.

100: portal management apparatus 110: authentication unit
120: network usage pattern input unit 200: open flow network control device
210: Requirement information DB 220: Vlan information DB
230: Topology information providing module 240: Vlan PCP field setting module
250: Vlan information providing module 260: OF message processing module
310: OF switch 320: OF node

Claims (15)

When the requirement information for the network usage pattern is inputted based on the topology information and the virtual local area network (Vlan) information transmitted from the open flow network control device, the queue / bandwidth of each OF (OpenFlow) A portal management apparatus for setting the portal management apparatus; And
OF open-flow messages based on the requirement information on the network usage pattern transmitted from the portal management apparatus, collects topology information and Vlan information about the OF nodes, and transmits the topology information and the Vlan information to the portal management apparatus, an open-loop network controller for setting a bandwidth dynamically for each subnet by reflecting a priority code point field;
A dynamic bandwidth setting system for each subnet based on an open flow network.
The method according to claim 1,
Wherein the requirement information for the network utilization pattern includes at least one of a required bandwidth for each Vlan ID, a shared link use reservation time information in units of Vlan, a designated OF node, and a Tagged port number of a designated OF node. Based dynamic bandwidth setting system for each subnet.
The method according to claim 1,
Wherein the portal management apparatus sets a queue / bandwidth of each OF node by reflecting a Guaranteed Minimum Bandwidth (GMB) scheduling policy provided by each OF node to which the shared link belongs. system.
The method according to claim 1,
The open-flow network control apparatus obtains basic configuration information for each node through open-flow feature messages and transmits LLDP (Link Layer Discovery Protocol) messages to OF nodes in the form of a packet-out message, Wherein the monitoring device monitors the connection status and generates topology information for the open flow network based on the connection status between the monitored OF nodes and transmits the generated topology information to the portal management device. .
The method according to claim 1,
The open flow network control apparatus collects and stores Vlan information including at least one of Vlan ID and interface information registered per OF node through SSH (Secure SHell) connection to each OF switches To the portal management apparatus, the open-flow-network-based subnet-specific dynamic bandwidth setting system.
A requirement information database for storing requirements information on the network usage pattern and queue / bandwidth information determined for the interfaces of the OF nodes to which the shared link belongs;
A Vlan information database storing Vlan information;
Obtain basic configuration information for each OF node through open flow feature messages and send link layer discovery protocol (LLDP) messages to OF nodes in the form of a packet-out message to monitor the connection status between OF nodes, A topology information providing module for generating topology information on the open flow network based on the connection state between the monitored OF nodes and transmitting the topology information to the portal management device;
Vlan information including at least one of Vlan ID and interface information registered for each OF node through an SSH (Secure SHell) connection to each OF switch is collected and stored in the Vlan information database, and Vlan information Providing module;
A Vlan pcp field setting module which reflects the Vlan pcp field for packet-in open flow messages based on the requirement information on the network usage pattern stored in the requirement information database and dynamically guarantees a bandwidth for each subnet; And
An OF message processing module for generating a flow table to be applied to OF nodes and transmitting the generated flow table to OF nodes;
And an open-flow network controller.
The method according to claim 6,
Wherein the requirement information for the network utilization pattern includes at least one of a required bandwidth for each Vlan ID, a shared link use reservation time information in units of Vlan, a designated OF node, and a Tagged port number of a designated OF node. controller.
The method according to claim 6,
The topology information providing module includes:
An OF node information management unit for acquiring basic configuration information for each OF node through Open Flow Feature messages;
Based on the basic configuration information of the OF nodes obtained by the OF node information management unit, transmits the LLDP messages to the OF nodes in the form of a packet-out message to monitor the connection status between the OF nodes, A link information obtaining unit for obtaining a status; And
And a topology management unit configured to structure the topology information for the open flow network using the connection state between the nodes obtained in the link information obtaining unit and transmit the structured topology information to the portal management apparatus. Network control device.
The method according to claim 6,
The Vlan information providing module includes:
Vlan information including at least one of Vlan ID and interface information registered for each OF node through an SSH (Secure SHell) connection to an OF switch is collected and stored in the Vlan information database, and Vlan information An acquisition unit; And
And a bandwidth setting unit configured to set a bandwidth for each of the OF nodes based on the bandwidth information stored in the requirement information database and the Vlan information obtained by the Vlan information obtaining unit.
The method according to claim 6,
The Vlan pcp field setting module includes:
A Vlan pcp field setting unit for reflecting a Vlan pcp field for packet-in open flow messages based on the requirement information for the network usage pattern stored in the requirement information database; And
And a timer management unit for dynamically changing and assigning a Vlan pcp top priority according to a scheduled time of using the shared link designated by the Vlan ID.
11. The method of claim 10,
The Vlan pcp field setting unit adds a "set_vlan_pcp" action to the Tagged port, in addition to the output port number specifying action, among the ports occupied by the designated Vlan ID arriving at the shared link use reservation time among the bottleneck region node groups, Among the bottleneck area node groups, among the ports occupied by the non-assigned Vlan IDs that fall outside the category of the shared link utilization reservation time, the Tagged port is allocated to the output and assigns a default rank to the flows through the "set_vlan_pcp" action in addition to the action specifying the port number.
11. The method of claim 10,
Wherein the Vlan pcp field setting unit specifies only the output port number for forwarding the flows for all the ports of the non-bottlenecking region node group and untagged ports of the bottlenecking region node group.
When the portal management apparatus inputs the requirement information on the network usage pattern based on the topology information and the Vlan information transmitted from the open-flow network control apparatus, the queue management unit sets queue / bandwidth information for each port of OF nodes to which the shared link belongs Transmitting the set queue / bandwidth information to an open-flow network control apparatus; And
Setting the bandwidth dynamically for each subnet by reflecting the Vlan pcp field in the packet-in open flow messages based on the requirement information on the network usage pattern transmitted from the portal management apparatus;
Based dynamic bandwidth setting method for each subnet based on an open flow network.
14. The method of claim 13,
Wherein the open-flow network control apparatus further comprises collecting topology information and Vlan information about OF nodes and transmitting the collected topology information and Vlan information to the portal management apparatus.
14. The method of claim 13,
Wherein the requirement information for the network utilization pattern includes at least one of a required bandwidth for each Vlan ID, a shared link use reservation time information in units of Vlan, a designated OF node, and a Tagged port number of a designated OF node. Based dynamic bandwidth setting per subnet.

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