CN113098784B - Distributed shunt based on SDN architecture and creation method thereof - Google Patents
Distributed shunt based on SDN architecture and creation method thereof Download PDFInfo
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- CN113098784B CN113098784B CN202110337696.7A CN202110337696A CN113098784B CN 113098784 B CN113098784 B CN 113098784B CN 202110337696 A CN202110337696 A CN 202110337696A CN 113098784 B CN113098784 B CN 113098784B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/12—Avoiding congestion; Recovering from congestion
- H04L47/125—Avoiding congestion; Recovering from congestion by balancing the load, e.g. traffic engineering
Abstract
The invention discloses a distributed splitter based on an SDN framework and a creation method thereof, wherein the whole splitter comprises an access layer for acquiring mirror flow of different regions, a core layer for collecting received data flows of different regions and a delivery layer for sending the data flows to a specified flow analysis device; the access layer and the core layer, and the core layer and the delivery layer are connected with each other two by two. And adding a filtering strategy, a delivery strategy and a network processing node on the basic architectures of the access layer, the core layer and the delivery layer. The flow divider is a flow acquisition and distribution platform which is simple in configuration, extremely high in expansibility and very accurate, and meets the increasing demand for more efficient and fine management of flow.
Description
Technical Field
The invention relates to a distributed shunt based on an SDN framework and a creation method thereof, belonging to the technical field of network communication.
Background
At the exit of a campus or campus network, it is common to deploy some bypassed traffic analysis devices. The current method is to transmit the network image traffic to the bypass device by means of mirror port traffic, network TAP (splitter) and optical splitter. However, as more bypass devices are deployed, the method encounters more and more problems, such as:
1. lack of uniform planning: various monitoring devices are deployed independently and monitored independently;
2. resources are limited: the port mirror image and the optical splitter in the traditional method are complex to operate, the port mirror image occupies a limited port of core equipment, if the attenuation of an optical path is too high, not only a network port Down of bypass equipment is caused, but also the stability of an Inline link is influenced;
3. cloud incapability: the traditional method cannot cover a virtual network architecture, collect cloud data and the like;
4. the extension is limited: the traditional method can only provide limited filtering functions, and has low expandability and high management difficulty. This has a great limitation to the development of services and the enlargement of network size. For example, replacing the core device (with a large number of interfaces) increases the operation cost, requires rewiring, and causes service interruption; moreover, if the monitoring device wants to acquire traffic of a specific destination port or a specific protocol, it is difficult for the traffic mirror and the optical splitter to complete the task.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a distributed splitter based on an SDN architecture, which can well solve the problems.
In order to achieve the purpose, the invention adopts the following technical scheme: a distributed splitter based on an SDN architecture, comprising:
the access layer is used for acquiring mirror image flow of different areas;
the core layer is used for summarizing the received data streams of different areas;
the delivery layer is used for sending the data stream to the specified traffic analysis equipment;
the access layer and the core layer, and the core layer and the delivery layer are connected with each other two by two; the data flow inlet of the access layer is an inlet set of the whole diverter, and the data flow outlet of the delivery layer is an outlet set of the diverter; and a filtering strategy, a delivery strategy and a network processing node are added among the access layer, the core layer and the delivery layer.
Furthermore, the access layer, the core layer and the delivery layer all include a preset number of SDN switches based on an OpenFlow protocol, and switch links between the access layer and the core layer and between the core layer and the delivery layer are packaged in a VLAN and a VXLAN manner, respectively, so as to implement cross-network interconnection.
A method for creating a distributed splitter based on an SDN architecture comprises the following steps:
step S1, defining a network infrastructure, wherein the whole network infrastructure is divided into three layers, namely an access layer, a core layer and a delivery layer, and the access layer is connected with the core layer and the core layer is connected with the delivery layer in pairs;
step S2, adding a distributed splitter on the basis of the infrastructure created in the step S1, wherein the distributed splitter comprises a switch set, a switch interface set and a link set which are selected for each layer;
step S3, adding a delivery strategy on the splitter created in the step S2, wherein the delivery strategy comprises selecting an access switch interface set and a delivery switch interface set, and defining flow characteristics;
step S4, adding a filtering strategy on the flow divider created in the step S2, wherein the filtering strategy comprises selecting an access switch interface set and defining flow characteristics;
step S5, adding a network processing node to the splitter created in step S2, including selecting a core switch interface set.
Further, the step S1 specifically includes:
step S11, defining a network infrastructure, and dividing the network infrastructure into three layers, namely an access layer, a core layer and a delivery layer;
step S12, configuring a preset number of SDN switches based on an OpenFlow protocol for each layer according to deployment requirements;
and step S13, respectively packaging the switch links between the access layer and the core layer and between the core layer and the delivery layer in a VLAN and VXLAN mode, and realizing cross-network interconnection.
Further, the step S2 specifically includes:
step S21, selecting an access switch set, a core switch set and a delivery switch set;
step S22, selecting an access switch interface set, a core switch interface set and a delivery switch interface set;
and step S23, selecting a link between the access switch and the core switch and a link between the core switch and the delivery switch, and realizing the self-defined and elastically expandable distributed splitter on the same network infrastructure.
Further, the step S3 specifically includes:
step S31, selecting an access switch interface set and a delivery switch interface set which need to be added with delivery strategies;
step S32, defining flow characteristics including VLAN ID, IP address, DSCP, transmission layer protocol and transmission layer port in flow;
step S33, calculating links between the access layer and the core layer and between the core layer and the delivery layer according to the access interface set and the delivery interface set in the delivery strategy; wherein, the access interface set is the access switch interface set selected in step S31, and the delivery interface set is the delivery switch interface set selected in step S31;
step S34, according to the access interface, the traffic characteristics, the link between the access layer and the core layer, the link between the core layer and the delivery layer, and the delivery interface, a set of OpenFlow flow tables is calculated, and the OpenFlow tables are issued to the SDN switch related to the interface set selected in step S31 through the controller, so that specific traffic is input from the access interface and output from the delivery interface.
Further, the step S4 specifically includes:
step S41, selecting the access exchanger interface set which needs to add the filtering strategy;
step S42, defining flow characteristics including VLAN ID, IP address, DSCP, transmission layer protocol and transmission layer port in flow;
and step S43, calculating a set of OpenFlow flow tables according to the access interface and flow characteristics, and issuing the OpenFlow flow tables to the SDN switch related to the interface set selected in the step S41 through the controller to realize that specific flow is discarded after being input from the access interface.
Further, the step S5 specifically includes:
step S51, selecting a core layer switch interface set which needs to be added with the network processing node, and taking the interface in the interface set as the receiving and sending interface of the network processing node;
step S52, traversing the delivery strategies, and combining the receiving and sending interfaces of the network processing nodes with each strategy;
and step S53, calculating a set of OpenFlow flow tables according to the access interface, the flow characteristics, the links between the access layer and the core layer, the receiving and sending interfaces of the network processing node, the links between the core layer and the delivery interface, and issuing the OpenFlow flow tables to all related SDN switches through the controller to realize the functions of flow centralized audit and centralized DPI.
Compared with the prior art, the invention has the following advantages:
firstly, a shunt is created on an SDN basic network architecture, so that unified flow planning is facilitated, deployment is convenient and flexible, expandability is strong, and construction cost is greatly saved;
secondly, the whole flow divider is a three-layer architecture model comprising a receiving layer, a core layer and a delivery layer, so that the functions of copying, converging, mapping, load balancing and the like of network flow can be realized conveniently;
thirdly, the delivery strategy and the filtering strategy are simple, flexible and powerful in configuration, and accurate matching and shunting of network flow can be realized;
fourthly, network nodes, such as network nodes with a DPI function and the like, can be added into the flow divider at will, and the accurate matching and flow dividing of the data flow can be further improved by combining a strategy.
Drawings
FIG. 1 is a diagram of a distributed splitter framework as disclosed in the examples of the present invention;
FIG. 2 is a diagram of a mirrored traffic import splitter as disclosed in an example of the present invention;
fig. 3 is a flow transmission diagram of a flow divider according to an embodiment of the present invention.
Detailed Description
The technical solutions in the implementation of the present invention will be made clear and fully described below with reference to the accompanying drawings, and the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a distributed shunt based on an SDN framework, which comprises:
the access layer is used for acquiring mirror image flow of different areas;
the core layer is used for summarizing the received data streams of different areas;
the delivery layer is used for sending the data stream to the specified traffic analysis equipment;
the access layer and the core layer, and the core layer and the delivery layer are used for sending the data stream to a specified flow and dividing the data stream into two layers for interconnection; the data flow inlet of the access layer is an inlet set of the whole diverter, and the data flow outlet of the delivery layer is an outlet set of the diverter; and a filtering strategy, a delivery strategy and a network processing node are added among the access layer, the core layer and the delivery layer.
Furthermore, the access layer, the core layer and the delivery layer all comprise a preset number of SDN switches based on an OpenFlow protocol, and switch links between the access layer and the core layer and between the core layer and the delivery layer are packaged in a VLAN (virtual local area network) and VXLAN (virtual extensible local area network) mode respectively, so that cross-network interconnection is realized.
In the VLAN packaging, the filtering rule is that at the path interface of an access layer switch, the path interface of a core layer switch and the exit interface of a delivery layer switch, an Action of a flow table is set as drop, and the delivery layer is prevented from transmitting data flow to the access layer; and VXLAN packaging, wherein the filtering rule is that VXLAN is arranged at a port corresponding to a physical connection link from an access layer to a core layer, VXLAN is also arranged at a port corresponding to a link from the core layer to a delivery layer, and an Action of a flow table is set as drop on the link as same as VLAN packaging.
A method for creating a distributed splitter based on an SDN architecture comprises the following steps:
step S1, defining a network infrastructure, wherein the whole network infrastructure is divided into three layers, namely an access layer, a core layer and a delivery layer, and the access layer is connected with the core layer and the core layer is connected with the delivery layer in pairs;
step S2, adding a distributed splitter on the basis of the infrastructure created in the step S1, wherein the distributed splitter comprises a switch set, a switch interface set and a link set which are selected for each layer;
step S3, adding a delivery strategy on the splitter created in the step S2, wherein the delivery strategy comprises selecting an access switch interface set and a delivery switch interface set, and defining flow characteristics;
step S4, adding a filtering strategy on the flow divider created in the step S2, wherein the filtering strategy comprises selecting an access switch interface set and defining flow characteristics;
step S5, adding a network processing node to the splitter created in step S2, including selecting a core switch interface set.
As a further limitation of the present invention, the step S1 specifically includes:
step S11, defining a network infrastructure, and dividing the network infrastructure into three layers, namely an access layer, a core layer and a delivery layer;
step S12, configuring a preset number of SDN switches based on an OpenFlow protocol for each layer according to deployment requirements;
and step S13, respectively packaging the switch links between the access layer and the core layer and between the core layer and the delivery layer in a VLAN and VXLAN mode, and realizing cross-network interconnection.
As a further limitation of the present invention, the step S2 specifically includes:
step S21, selecting an access switch set, a core switch set and a delivery switch set;
step S22, selecting an access switch interface set, a core switch interface set and a delivery switch interface set;
and step S23, selecting a link between the access switch and the core switch and a link between the core switch and the delivery switch, and realizing the self-defined and elastically expandable distributed splitter on the same network infrastructure.
As a further limitation of the present invention, the step S3 specifically includes:
step S31, selecting an access switch interface set and a delivery switch interface set which need to be added with delivery strategies; wherein the selected access switch interface set is a subset of the access switch interface set selected in step S2, and the selected delivery switch interface set is a subset of the delivery switch interface set selected in step S2;
step S32, defining flow characteristics including VLAN ID, IP address, DSCP, transmission layer protocol and transmission layer port in flow;
step S33, calculating links between the access layer and the core layer and between the core layer and the delivery layer according to the access interface set and the delivery interface set in the delivery strategy; wherein, the access interface set is the access switch interface set selected in step S31, and the delivery interface set is the delivery switch interface set selected in step S31;
step S34, according to the access interface, the traffic characteristics, the link between the access layer and the core layer, the link between the core layer and the delivery layer, and the delivery interface, a set of OpenFlow flow tables is calculated, and the OpenFlow tables are issued to the SDN switch related to the interface set selected in step S31 through the controller, so that specific traffic is input from the access interface and output from the delivery interface.
As a further limitation of the present invention, the step S4 specifically includes:
step S41, selecting the access exchanger interface set which needs to add the filtering strategy; wherein, the selected access switch interface set is a subset of the access switch interface set selected in step S2, and is unrelated to the access switch interface set selected in step S31;
step S42, defining flow characteristics including VLAN ID, IP address, DSCP, transmission layer protocol and transmission layer port in flow;
and step S43, calculating a set of OpenFlow flow tables according to the access interface and flow characteristics, and issuing the OpenFlow flow tables to the SDN switch related to the interface set selected in the step S41 through the controller to realize that specific flow is discarded after being input from the access interface.
As a further limitation of the present invention, the step S5 specifically includes:
step S51, selecting a core layer switch interface set which needs to be added with the network processing node, and taking the interface in the interface set as the receiving and sending interface of the network processing node;
step S52, traversing the delivery strategies, and combining the receiving and sending interfaces of the network processing nodes with each strategy;
and step S53, calculating a set of OpenFlow flow tables according to the access interface, the flow characteristics, the links between the access layer and the core layer, the receiving and sending interfaces of the network processing node, the links between the core layer and the delivery interface, and issuing the OpenFlow flow tables to all related SDN switches through the controller to realize the functions of flow centralized audit and centralized DPI.
Example (b):
as shown in fig. 1, assume that the receive layer (Access) deploys 2 switches, SDN _ A, SDN _ B respectively; a Delivery layer (Delivery) deploys 2 switches, namely SDN _ D, SDN _ E; core layer (Core) deploys 1 switch SDN _ C. Physical links are constructed between the receiving layer and the core layer, and between the core layer and the delivery layer, and are used for classifying and transmitting the mirror image traffic.
The receiving layer, the core layer and the delivery layer process the mirror flow according to the sequence, and the Drop of the Action in the flow table is executed according to the strategy in the reverse sequence.
As shown in fig. 2, in the SDN network, the mirror port of each node transmits the duplicated traffic to the import set corresponding to the access layer switch, and the access layer switch encapsulates the packet of the mirror traffic according to the offloading policy (optionally, VLAN or VXLAN), thereby laying a foundation for implementing communication in the local area network or across the wide area network.
As shown in fig. 3, the access layer sends the received mirror traffic set _ vlan (or set _ vxlan) to the core layer, the core layer receives the traffic from the receiving layer, and the matching policy (its attached rules) is sent to the designated delivery layer switch egress along the physical Path of the splitter.
With the increase of network flow, when the number of switch ports in a certain layer or multiple layers of the infrastructure cannot meet the requirement, capacity expansion can be realized by adding SDN switches and adding a shunt;
if the network flow currently processed needs to be adjusted, the network flow can be realized by simply adjusting the delivery strategy, the filtering strategy or the network processing node.
In summary, the present invention establishes a path of a splitter, normalizes a data flow direction, constructs a splitter flow forwarding graph, calculates a policy intersection of OpenFlow flow tables, changes a priority of the intersection policy, attaches a tag (VLAN or VXLAN) to a mirror flow, introduces the mirror flow into an access layer device, and splits each monitoring device from a delivery layer device, thereby implementing mirror flow load balancing and improving communication efficiency of a network. Meanwhile, the shunt is established on the SDN basic network architecture, so that unified flow planning is facilitated, the deployment is convenient and flexible, the expandability is strong, and the construction cost is greatly saved; the whole flow divider is a three-layer architecture model comprising a receiving layer, a core layer and a delivery layer, and is convenient for realizing the functions of copying, converging, mapping, load balancing and the like of network flow; the delivery strategy and the filtering strategy are simple, flexible and powerful in configuration, and accurate matching and shunting of network flow can be realized; and network nodes, such as network nodes with a DPI function and the like, can be optionally added in the splitter, and the accurate matching and splitting of data flow can be further improved by combining strategies. The establishing method realizes a flow collecting and distributing platform which is simple in configuration, extremely strong in expansibility and very accurate at the same time by defining an SDN network infrastructure, establishing a distributed splitter, adding a delivery strategy, adding a filtering strategy and adding network processing nodes, and meets the increasing demand of more efficient and more precise management on flow.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the embodiments may be appropriately combined to form other embodiments understood by those skilled in the art.
Claims (3)
1. A method for creating a distributed splitter based on an SDN architecture is characterized by comprising the following steps:
step S1, defining a network infrastructure, wherein the whole network infrastructure is divided into three layers, namely an access layer, a core layer and a delivery layer, and the access layer is connected with the core layer and the core layer is connected with the delivery layer in pairs;
step S2, adding a distributed splitter on the basis of the infrastructure created in the step S1, wherein the distributed splitter comprises a switch set, a switch interface set and a link set which are selected for each layer;
step S3, adding a delivery strategy on the splitter created in the step S2, wherein the delivery strategy comprises selecting an access switch interface set and a delivery switch interface set, and defining flow characteristics;
step S4, adding a filtering strategy on the flow divider created in the step S2, wherein the filtering strategy comprises selecting an access switch interface set and defining flow characteristics;
step S5, adding network processing nodes on the splitter created in step S2, including selecting a core switch interface set;
the step S1 specifically includes:
step S11, defining a network infrastructure, and dividing the network infrastructure into three layers, namely an access layer, a core layer and a delivery layer;
step S12, configuring a preset number of SDN switches based on an OpenFlow protocol for each layer according to deployment requirements;
step S13, the switch links between the access layer and the core layer and between the core layer and the delivery layer are respectively packaged in a VLAN and VXLAN mode to realize cross-network interconnection;
the step S2 specifically includes:
step S21, selecting an access switch set, a core switch set and a delivery switch set;
step S22, selecting an access switch interface set, a core switch interface set and a delivery switch interface set;
step S23, selecting a link between an access switch and a core switch and a link between the core switch and a delivery switch, and realizing a self-defined and elastically expandable distributed splitter on the same network infrastructure;
the step S3 specifically includes:
step S31, selecting an access switch interface set and a delivery switch interface set which need to be added with a delivery strategy;
step S32, defining flow characteristics including VLAN ID, IP address, DSCP, transmission layer protocol and transmission layer port in flow;
step S33, calculating links between the access layer and the core layer, and between the core layer and the delivery layer according to the access interface set and the delivery interface set in the delivery strategy; wherein, the access interface set is the access switch interface set selected in step S31, and the delivery interface set is the delivery switch interface set selected in step S31;
step S34, calculating a set of OpenFlow flow tables according to the access interface, the flow characteristics, the links between the access layer and the core layer, the links between the core layer and the delivery interface, and issuing the OpenFlow flow tables to the SDN switch related to the interface set selected in the step S31 through the controller to realize the input of specific flow from the access interface and the output from the delivery interface;
the step S4 specifically includes:
step S41, selecting the access exchanger interface set which needs to add the filtering strategy;
step S42, defining flow characteristics including VLAN ID, IP address, DSCP, transmission layer protocol and transmission layer port in flow;
step S43, according to the access interface and the flow characteristics, a set of OpenFlow flow tables is calculated, and the OpenFlow flow tables are issued to the SDN switch related to the interface set selected in the step S41 through the controller, so that specific flow is input from the access interface and then discarded;
the step S5 specifically includes:
step S51, selecting the core layer switch interface set which needs to add network processing node, and using the interface in the interface set as the receiving and sending interface of the network processing node;
step S52, traversing the delivery strategies, and combining the receiving and sending interfaces of the network processing nodes with each strategy;
and step S53, calculating a set of OpenFlow flow tables according to the access interface, the flow characteristics, the links between the access layer and the core layer, the receiving and sending interfaces of the network processing node, the links between the core layer and the delivery interface, and issuing the OpenFlow flow tables to all related SDN switches through the controller to realize the functions of flow centralized audit and centralized DPI.
2. A distributed splitter based on an SDN architecture, the distributed splitter being created by the creating method of claim 1, including:
the access layer is used for acquiring mirror image flow of different areas;
the core layer is used for summarizing the received data streams of different areas;
the delivery layer is used for sending the data stream to the specified flow analysis equipment;
the access layer and the core layer, and the core layer and the delivery layer are connected with each other two by two; the data flow inlet of the access layer is an inlet set of the whole diverter, and the data flow outlet of the delivery layer is an outlet set of the diverter; and a filtering strategy, a delivery strategy and a network processing node are added among the access layer, the core layer and the delivery layer.
3. The distributed splitter based on the SDN architecture of claim 2, wherein the access layer, the core layer, and the delivery layer each include a preset number of SDN switches based on an OpenFlow protocol, and switch links between the access layer and the core layer, and between the core layer and the delivery layer are respectively encapsulated in a VLAN and VXLAN manner, thereby implementing cross-network interconnection.
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