CN110572327A - Method for realizing cross-network-segment data forwarding of neutron network and flow controllable method - Google Patents
Method for realizing cross-network-segment data forwarding of neutron network and flow controllable method Download PDFInfo
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- CN110572327A CN110572327A CN201910701777.3A CN201910701777A CN110572327A CN 110572327 A CN110572327 A CN 110572327A CN 201910701777 A CN201910701777 A CN 201910701777A CN 110572327 A CN110572327 A CN 110572327A
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
- H04L45/745—Address table lookup; Address filtering
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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
- H04L49/00—Packet switching elements
- H04L49/70—Virtual switches
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
Abstract
the invention provides a method for realizing cross-network-segment data forwarding and flow control of a neutron network, which comprises the following steps: setting an Open Flow protocol to add a relevant Flow table in an Open Flow switch; and processing the received message by inquiring the Flow table, and forwarding the data to a corresponding port according to the corresponding Flow table entry to finish the data forwarding of the whole Open Flow network. The Open Flow controller is used for centrally controlling Neutron network traffic through an Open Flow network model. Meanwhile, aiming at the defects of the Open Flow protocol in the cross-segment data forwarding aspect, an action function for processing the ARP and the ICMP message is added on the basis of the current Open Flow protocol, so that the Open Flow protocol can normally respond to the ARP packet and the three-layer data packet ICMP, data forwarding can be carried out between different network segments, and the data Flow of the Neutron network is better controlled.
Description
Technical Field
the invention relates to the technical field of network services, in particular to a method for realizing cross-network-segment data forwarding and a flow controllable method of a neutron network.
Background
With the advent of the cloud computing era, infrastructure service-based cloud computing management platforms have received wide attention, and the generation and rapid development of Open cloud platforms Open Stack are also beneficial to this.
The Network structure of the early Open Stack is Nova-Network, but the Nova-Network structure is relatively simple in design and can only meet the simple requirement of a small-scale two-layer Network. With the continuous expansion of network scale and the proposal of network as a service concept, the Open Stack community proposes a Neutron network model, and a user can use an API provided by Neutron and then customize advanced network services such as network topology, VPN, Firewall and the like according to the requirement of the user.
although the Neutron network of Open Stack realizes network services and also satisfies the generalized software defined network, the model still has the following disadvantages:
In a Neutron network, a virtual switch used is an Open VSwitch, an overall architecture is designed based on a traditional network mode, a forwarding layer and a control layer of the virtual switch are not stripped, data exchange between the switches is automatically negotiated based on a dynamic protocol, and forwarding of overall data is uncontrollable, so that controllability of flow is insufficient.
Disclosure of Invention
the invention provides a method for realizing cross-network data forwarding of a Neutron network and a method for controlling the flow, aiming at the problems that in the Neutron network, a used virtual switch is an Open VSwitch, the whole architecture is designed based on the traditional network mode, a forwarding layer and a control layer of the virtual switch are not separated, data exchange between the switches is automatically negotiated based on a dynamic protocol, and the forwarding of the whole data is uncontrollable.
the technical scheme of the invention is as follows:
In a first aspect, a technical solution of the present invention provides a method for implementing data forwarding across network segments in a neutron network, including the following steps:
Setting an Open Flow protocol to add a relevant Flow table in an Open Flow switch;
and processing the received message by inquiring the Flow table, and forwarding the data to a corresponding port according to the corresponding Flow table entry to finish the data forwarding of the whole Open Flow network.
further, the step of processing the received packet by querying the Flow table, forwarding the data to the corresponding port according to the corresponding Flow table entry, and completing the data forwarding of the entire Open Flow network includes processing an ARP packet, and the specific steps are as follows:
when the Open Flow switch receives the data packet, analyzing the header of the data packet;
judging whether the packet is an ARP message or not according to the analyzed header information of the packet;
If not, performing other processing;
If the ARP message is the ARP message, judging whether the destination address is an interface IP address of an Open Flow switch or not;
And if the destination address is the interface IP address of the Open Flow switch, inquiring a Flow table of the Open Flow switch, matching the message, and if a matched Flow table item exists, processing the message according to the Flow table item.
further, the processing step of the ARP packet further includes:
And if the Flow table item is not matched, updating the Flow table of the Open Flow switch.
further, the processing step of the ARP packet further includes:
if the message is an ARP message but the destination address of the message is not the interface IP address of the Open Flow switch, judging whether the message is the other interface IP address of the Open Flow switch or not, if the destination address is determined to be the other port IP address of the Open Flow switch, inquiring a Flow table of the Open Flow switch, matching the message, and if a matched Flow table item exists, processing the message according to the Flow table item; and if the Flow table item is not matched, updating the Flow table of the Open Flow switch.
Further, the processing step of the ARP packet further includes:
if the message is the ARP message but the destination address of the message is not the interface IP address of the Open Flow switch, judging whether the message is the other interface IP address of the Open Flow switch or not, if the destination address is not the other port IP address of the Open Flow switch, uniformly sending the message to the Open Flow controller, and uniformly processing the message by the controller.
further, the step of processing the received message by querying the Flow table, forwarding the data to the corresponding port according to the corresponding Flow table entry, and completing the data forwarding of the whole Open Flow network includes processing the ICMP message, and the specific steps are as follows:
when the Open Flow switch receives the data packet, analyzing the header of the data packet;
Whether the ICMP message is determined by the analyzed header information of the data packet, if the ICMP message is determined, whether the destination address of the ICMP message is the local address is continuously determined, if the ICMP message is the local address, the ICMP message request is directly responded, if the destination address is a non-local address, an IP _ MAC cache table of an Open Flow switch is inquired, and if a matching item exists in the cache table, the MAC address is obtained, and the data is forwarded according to the path.
further, the step of processing the ICMP packet further includes:
And if the cache table has no matching item, the Open Flow switch sends an ARP request to the destination address, and executes an ARP message processing Flow.
further, the step of processing the ICMP packet further includes:
When the received data packet is an ICMP message, inquiring a cache table of an Open Flow switch according to the IP address to search a corresponding MAC address;
Modifying the source MAC address and the destination MAC address, and sending the data packet to a corresponding port;
if the cache table of the exchanger is inquired according to the IP address and does not have a corresponding MAC address, an ARP request is sent to the target address to obtain the target MAC address;
The IP address and the destination MAC address are stored to a cache table of the switch.
In a second aspect, a technical solution of the present invention provides a method for implementing that a neutron network traffic is controllable, including the following steps:
setting an Open Flow protocol to realize cross-network segment data forwarding of the neutron network;
An Open Flow controller controls Neutron network Flow;
The step of implementing the network segment data forwarding across the neutron network is the step of the method for implementing the network segment data forwarding across the neutron network in the first aspect.
The problem that the Open Flow protocol does not support ARP message and ICMP packet processing is solved. Through the action of new addition, the Open Flow switch can normally forward the ICMP request between different network segments.
according to the technical scheme, the invention has the following advantages: the Open Flow controller is used for centrally controlling Neutron network traffic through an Open Flow network model. Meanwhile, aiming at the defects of the Open Flow protocol in the cross-segment data forwarding aspect, an action function for processing the ARP and the ICMP message is added on the basis of the current Open Flow protocol, so that the Open Flow protocol can normally respond to the ARP packet and the three-layer data packet ICMP, data forwarding can be carried out between different network segments, and the data Flow of the Neutron network is better controlled.
In addition, the invention has reliable design principle, simple structure and very wide application prospect.
therefore, compared with the prior art, the invention has prominent substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.
drawings
in order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic flowchart of a method for processing an ARP packet according to an embodiment of the present invention.
Fig. 2 is a schematic flowchart of a method for processing an ICMP packet according to an embodiment of the present invention.
Detailed Description
in order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
the technical scheme of the invention provides a method for realizing cross-network-segment data forwarding of a neutron network, which comprises the following steps:
setting an Open Flow protocol to add a relevant Flow table in an Open Flow switch;
And processing the received message by inquiring the Flow table, and forwarding the data to a corresponding port according to the corresponding Flow table entry to finish the data forwarding of the whole Open Flow network.
it should be noted that, in this embodiment, the step of processing a received packet by querying a Flow table, forwarding data to a corresponding port according to a corresponding Flow entry, and completing data forwarding of the entire Open Flow network includes processing an ARP packet, as shown in fig. 1, the specific steps are as follows:
when the Open Flow switch receives the data packet, analyzing the header of the data packet; judging whether the packet is an ARP message or not according to the analyzed header information of the packet; if not, performing other processing; if the ARP message is the ARP message, judging whether the destination address is an interface IP address of an Open Flow switch or not; and if the destination address is the interface IP address of the Open Flow switch, inquiring a Flow table of the Open Flow switch, matching the message, and if a matched Flow table item exists, processing the message according to the Flow table item. And if the Flow table item is not matched, updating the Flow table of the Open Flow switch.
If the message is an ARP message but the destination address of the message is not the interface IP address of the Open Flow switch, judging whether the message is the other interface IP address of the Open Flow switch or not, if the destination address is determined to be the other port IP address of the Open Flow switch, inquiring a Flow table of the Open Flow switch, matching the message, and if a matched Flow table item exists, processing the message according to the Flow table item; and if the Flow table item is not matched, updating the Flow table of the Open Flow switch.
If the message is the ARP message but the destination address of the message is not the interface IP address of the Open Flow switch, judging whether the message is the other interface IP address of the Open Flow switch or not, if the destination address is not the other port IP address of the Open Flow switch, uniformly sending the message to the Open Flow controller, and uniformly processing the message by the controller.
The step of processing the received message by querying the Flow table, forwarding the data to the corresponding port according to the corresponding Flow table entry, and completing the data forwarding of the whole Open Flow network includes processing the ICMP message, as shown in fig. 2, and the specific steps are as follows:
when the Open Flow switch receives the data packet, analyzing the header of the data packet;
whether the ICMP message is determined by the analyzed header information of the data packet, if the ICMP message is determined, whether the destination address of the ICMP message is the local address is continuously determined, if the ICMP message is the local address, the ICMP message request is directly responded, if the destination address is a non-local address, an IP _ MAC cache table of an Open Flow switch is inquired, and if a matching item exists in the cache table, the MAC address is obtained, and the data is forwarded according to the path. And if the cache table has no matching item, the Open Flow switch sends an ARP request to the destination address, and executes an ARP message processing Flow.
it should be noted that, when the received data packet is an ICMP packet, the cache table of the Open Flow switch is queried according to the IP address to find a corresponding MAC address; modifying the source MAC address and the destination MAC address, and sending the data packet to a corresponding port; if the cache table of the exchanger is inquired according to the IP address and does not have a corresponding MAC address, an ARP request is sent to the target address to obtain the target MAC address; the IP address and the destination MAC address are stored to a cache table of the switch.
In the above code, the port structure represents a port data structure of an Open Flow switch, the buffer structure represents a cache for storing ARP packets, and the ofp _ action _ header structure represents an action of an Open Flow protocol. Messages which are not processed are uniformly forwarded to an Open Flow controller and are uniformly processed by the controller, and the message forwarding function is mainly realized by a function of _ action _ output ().
after adding basic actions for processing ARP packets and ICMP packets on the original basis of the Open Flow protocol, the current Open Flow network can forward data of different network segments, a relevant Flow table is added into the Open Flow switch, the Open Flow switch processes the received ARP packets and ICMP packets by inquiring the Flow table, and then the data are forwarded to corresponding ports according to corresponding Flow table items, so that the data forwarding of the whole Open Flow network is completed.
Example two
The technical scheme of the invention provides a method for realizing the controllable network flow of a neutron, which comprises the following steps:
Setting an Open Flow protocol to realize cross-network segment data forwarding of the neutron network;
an Open Flow controller controls Neutron network Flow;
The step of implementing the data forwarding across network segments of the neutron network is the step of the method of implementing the data forwarding across network segments of the neutron network described in the first embodiment. The Open Flow controller for controlling Neutron network traffic is well known in the art and will not be described herein.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A method for realizing data forwarding across network segments of a neutron network is characterized by comprising the following steps:
setting an Open Flow protocol and adding a relevant Flow table in an Open Flow switch;
and processing the received message by inquiring the Flow table, and forwarding the data to a corresponding port according to the corresponding Flow table entry to finish the data forwarding of the whole Open Flow network.
2. The method according to claim 1, wherein the step of processing the ARP packet includes the steps of receiving a packet by querying a Flow table, forwarding the packet to a corresponding port according to a corresponding Flow table entry, and completing the data forwarding of the entire Open Flow network, and the specific steps include:
When the Open Flow switch receives the data packet, analyzing the header of the data packet;
judging whether the packet is an ARP message or not according to the analyzed header information of the packet;
If not, performing other processing;
If the ARP message is the ARP message, judging whether the destination address is an interface IP address of an Open Flow switch or not;
and if the destination address is the interface IP address of the Open Flow switch, inquiring a Flow table of the Open Flow switch, matching the message, and if a matched Flow table item exists, processing the message according to the Flow table item.
3. The method according to claim 2, wherein the step of processing the ARP packet further includes:
and if the Flow table item is not matched, updating the Flow table of the Open Flow switch.
4. the method according to claim 3, wherein the step of processing the ARP packet further includes:
If the message is an ARP message but the destination address of the message is not the interface IP address of the Open Flow switch, judging whether the message is the other interface IP address of the Open Flow switch or not, if the destination address is determined to be the other port IP address of the Open Flow switch, inquiring a Flow table of the Open Flow switch, matching the message, and if a matched Flow table item exists, processing the message according to the Flow table item; and if the Flow table item is not matched, updating the Flow table of the Open Flow switch.
5. the method according to claim 4, wherein the step of processing the ARP packet further includes:
if the message is the ARP message but the destination address of the message is not the interface IP address of the Open Flow switch, judging whether the message is the other interface IP address of the Open Flow switch or not, if the destination address is not the other port IP address of the Open Flow switch, uniformly sending the message to the Open Flow controller, and uniformly processing the message by the controller.
6. The method according to claim 5, wherein the step of processing the ICMP packet by querying a Flow table to process the received packet, forwarding the packet to a corresponding port according to a corresponding Flow table entry, and completing the packet forwarding of the entire Open Flow network includes the following specific steps:
when the Open Flow switch receives the data packet, analyzing the header of the data packet;
whether the ICMP message is determined by the analyzed header information of the data packet, if the ICMP message is determined, whether the destination address of the ICMP message is the local address is continuously determined, if the ICMP message is the local address, the ICMP message request is directly responded, if the destination address is a non-local address, an IP _ MAC cache table of an Open Flow switch is inquired, and if a matching item exists in the cache table, the MAC address is obtained, and the data is forwarded according to the path.
7. the method according to claim 6, wherein the step of processing the ICMP packet further comprises:
And if the cache table has no matching item, the Open Flow switch sends an ARP request to the destination address, and executes an ARP message processing Flow.
8. The method according to claim 7, wherein the step of processing the ICMP packet further comprises:
when the received data packet is an ICMP message, inquiring a cache table of an Open Flow switch according to the IP address, and searching a corresponding MAC address;
modifying the source MAC address and the destination MAC address, and sending the data packet to a corresponding port;
if the cache table of the exchanger is inquired according to the IP address and does not have a corresponding MAC address, an ARP request is sent to the target address to obtain the target MAC address;
the IP address and the destination MAC address are stored to a cache table of the switch.
9. a method for realizing the controllable network flow of a neutron is characterized by comprising the following steps:
Setting an Open Flow protocol to realize cross-network segment data forwarding of the neutron network;
An Open Flow controller controls Neutron network Flow;
The step of implementing the data forwarding across network segments of the neutron network is the step of implementing the data forwarding across network segments of the neutron network as claimed in any one of claims 1 to 8.
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Application publication date: 20191213 |