CN106101297B - A kind of message answer method and device - Google Patents
A kind of message answer method and device Download PDFInfo
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- CN106101297B CN106101297B CN201610391043.6A CN201610391043A CN106101297B CN 106101297 B CN106101297 B CN 106101297B CN 201610391043 A CN201610391043 A CN 201610391043A CN 106101297 B CN106101297 B CN 106101297B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/10—Mapping addresses of different types
- H04L61/103—Mapping addresses of different types across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP]
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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
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The present invention provides a kind of message answer method and device, is applied on switching equipment, this method comprises: receiving the message that user terminal is sent；When the connection of detection and control device disconnects, determine whether received message is Address requests message；When determining received message is Address requests message, the first address carried in the Address requests message is obtained；The forwarding flow entry comprising first address is judged whether there is, record has the first address and two address corresponding relationship in the forwarding flow entry；When there is the forwarding flow entry comprising first address, the second address in the forwarding flow entry is obtained；Address response message is responded to the user terminal, carries second address in the address response message.The present invention can avoid the flow interrupt problem after switching equipment is disconnected with controller, improve the stability of SDN network.
Description
Technical field
The present invention relates to network communication technology field more particularly to a kind of message answer methods and device.
Background technique
SDN (Software Defined Network, software defined network) is a kind of novel transmission via net framework, is led to
Plane and data planar separation will be controlled by crossing, and realize the flexible control of network flow.
SDN network is made of controller and switching equipment.ARP (the Address Resolution that user terminal is sent
Protocol, address resolution protocol) message or DHCP (Dynamic Host Configuration Protocol, DynamicHost
Configuration protocol) message by switching equipment is transmitted to response in controller collection.When controller failure or switching equipment and controller
Between communication link fails when, user terminal can not receive response message, cause the IP (Internet of user terminal
Protocol, Internet protocol) address loses (for example, when user terminal is restarted) or ARP entry is lost (for example, ARP entry obtains not
It is deleted to timely updating), so as to cause flow interrupt.
Summary of the invention
The purpose of the present invention is to provide a kind of message answer method and device, to according to having forwarding on switching equipment
Address corresponding relationship in flow entry carries out response to the Address requests of user terminal.
For achieving the above object, the present invention provides technical solutions:
The present invention provides a kind of message answer method, is applied on switching equipment, this method comprises:
Receive the message that user terminal is sent；
When the connection of detection and control device disconnects, determine whether received message is Address requests message；
When determining received message is Address requests message, the first ground carried in the Address requests message is obtained
Location；
The forwarding flow entry comprising first address is judged whether there is, record has the first ground in the forwarding flow entry
Location and two address corresponding relationship；
When there is the forwarding flow entry comprising first address, the second address in the forwarding flow entry is obtained；
Address response message is responded to the user terminal, carries second address in the address response message.
The present invention also provides a kind of message answering devices, are applied on switching equipment, which includes:
Message receiving unit, for receiving the message of user terminal transmission；
Message determination unit, for determining whether received message is address when the connection of detection and control device disconnection
Request message；
First acquisition unit, for obtaining the Address requests report when determining received message is Address requests message
The first address carried in text；
List item judging unit, for judging whether there is the forwarding flow entry comprising first address, the forwarding flow
Record has the first address and two address corresponding relationship in list item；
Second acquisition unit, for obtaining the forwarding flow table when there is the forwarding flow entry comprising first address
The second address in；
Message responds unit, for responding address response message to the user terminal, takes in the address response message
With second address.
Switching equipment of the present invention is by the analysis to having forwarding flow entry it can be seen from above description, to having stream
The Address requests for measuring the user terminal being related to carry out response, thus in the flow after avoiding switching equipment and controller from disconnecting
Disconnected problem, improves the stability of SDN network.
Detailed description of the invention
Fig. 1 is the schematic diagram of the SDN network shown in the embodiment of the present invention；
Fig. 2 is the message answer method flow chart shown in the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of the switching equipment shown in the embodiment of the present invention；
Fig. 4 is the structural schematic diagram of the message answering device shown in the embodiment of the present invention.
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistented with the present invention.On the contrary, they be only with it is such as appended
The example of device and method being described in detail in claims, some aspects of the invention are consistent.
It is only to be not intended to limit the invention merely for for the purpose of describing particular embodiments in terminology used in the present invention.
It is also intended in the present invention and the "an" of singular used in the attached claims, " described " and "the" including majority
Form, unless the context clearly indicates other meaning.It is also understood that term "and/or" used herein refers to and wraps
It may be combined containing one or more associated any or all of project listed.
It will be appreciated that though various information, but this may be described using term first, second, third, etc. in the present invention
A little information should not necessarily be limited by these terms.These terms are only used to for same type of information being distinguished from each other out.For example, not departing from
In the case where the scope of the invention, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as
One information.Depending on context, word as used in this " if " can be construed to " ... when " or " when ...
When " or " in response to determination ".
The embodiment of the present invention proposes a kind of message answer method, and this method is by having forwarding flow entry in switching equipment
Analysis, response is carried out to the Address requests for the user terminal that existing flow is related to, to guarantee that flow does not interrupt.
It is the SDN network schematic diagram shown in the embodiment of the present invention referring to Fig. 1.The SDN network includes controller
Controller, gateway GW, virtual swap device OVS1 and OVS2 and virtual machine VM1~VM6.Certainly, the present invention does not have
Equipment in body limitation SDN network is entity device or virtual unit, can self assemble according to actual needs.
It referring to fig. 2, is one embodiment flow chart of message answer method of the present invention, the embodiment is to message answering
It is described.
Step 201, the message that user terminal is sent is received.
The message that user terminal issues arrives first on the switching equipment direct-connected with it, for example, the message that VM1 is sent is first
OVS1 is reached, subsequent processing is executed by direct-connected switching equipment.
Step 202, when the connection of detection and control device disconnects, determine whether received message is Address requests message.
When switching equipment detects that the connection between controller disconnects (for example, controller failure or switching equipment and control
Connection caused by link failure between device processed disconnects) when, then the address for showing that controller can not again send user terminal asks
It asks and carries out response, at this point, by switching equipment on behalf of response.
Switching equipment is before carrying out response, it is necessary first to the type of message for determining received message, it is received confirming
When message is Address requests message, response is carried out for Address requests message.In a kind of preferably embodiment, switching equipment
The message characteristic (for example, protocol type, source/destination port numbers etc.) that pre-set Address requests message can be obtained, referring to table 1
Table 1
When the message characteristic of received message is identical as the message characteristic of preset Address requests message, determine received
Message is Address requests message.For example, it is assumed that the Ethernet protocol type eth_type of received message is arp, then can confirm
Currently received message is ARP request message.
Step 203, it when determining received message is Address requests message, obtains and carries in the Address requests message
First address.
When determining that received message is DHCP request message (for example, DHCP Discover message) by step 202,
The first address that DHCP request message carries is obtained, first address is for the currently MAC of the user terminal of initiation Address requests
Location；When received message is ARP request message, the first address that ARP request message carries is obtained, at this point, first address
For the IP address for currently initiating purpose user terminal known to the user terminal of Address requests.
Step 204, the forwarding flow entry comprising first address is judged whether there is, is recorded in the forwarding flow entry
There are the first address and two address corresponding relationship.
Step 205, when there is the forwarding flow entry comprising first address, second in the forwarding flow entry is obtained
Address.
In SDN network, the forwarding flow entry that switching equipment is issued according to controller instructs normal data message to forward, should
Forwarding flow entry generally includes the information such as source/destination IP address, source/destination MAC Address, protocol type and exit port.Pass through
Parsing to forwarding flow entry is it is found that there are the corresponding relationships and purpose of source IP address and source MAC in forwarding flow entry
The corresponding relationship of IP address and target MAC (Media Access Control) address.
After switching equipment gets the first address carried in Address requests message, the forwarding flow of local record can be inquired
List item, confirmation is local to whether there is the forwarding flow entry comprising the first address.For example, when address request message is DHCP request report
Wen Shi, the first address are the MAC Address of user terminal, are confirmed whether there is the forwarding flow entry comprising user terminal MAC Address；
When address request message be ARP request message when, the first address be purpose user terminal IP address, be confirmed whether exist comprising
The forwarding flow entry of the purpose user terminal IP address.
As previously mentioned, in forwarding flow entry, there are the corresponding relationships of IP address and MAC Address, therefore, are finding comprising the
After the forwarding flow entry of one address, the second address corresponding with the first address in forwarding flow entry can be obtained.For DHCP request
For, the second address is the IP address for initiating the user terminal of request；For ARP request, the second address is purpose user
The MAC Address of terminal.
Step 206, Xiang Suoshu user terminal responds address response message, carries described second in the address response message
Address.
For DHCP request, address response message is dhcp response message (for example, DHCP Offer message), DHCP
The IP address of user terminal is carried in response message；For ARP request, address response message is arp response message, ARP
The MAC Address of purpose user terminal is carried in response message.
It can be seen from above description for have flow, due to its on switching equipment existing forwarding flow entry, because
This, between controller failure or switching equipment and controller when link failure, switching equipment is locally saved by inquiry
Flow entry is forwarded, the Address requests of user terminal are responded, is obtained for a long time so as to avoid the Address requests of user terminal
Existing flow interrupt is caused less than response.
In addition, when switching equipment inquires forwarding flow entry (for example, newly generated flow) corresponding less than ARP request message
When, i.e., there is no when the forwarding flow entry comprising purpose user terminal IP address, the MAC Address of gateway can be obtained, by net
The MAC Address for closing equipment, which is added in arp response message, is sent to user terminal, so that user terminal is according to gateway
Flow is sent to gateway by MAC Address, flow forwarding is carried out by gateway, so that the forwarding for solving new flow is asked
Topic.
You need to add is that switching equipment can disable when detecting that the connection with controller disconnects and send control on flow
The flow entry (will cannot match send controller to handle in the prior art on the flow of forwarding flow entry) of device, referred to as send stream on first
List item activates the flow entry for sending gateway on flow, flow entry is sent on referred to as second, referring to table 2.
| Occurrence | Action item | Whether activate |
| Eth_type:ipv4 | On send gateway | It is |
Table 2
Table 2 is the example that flow entry is sent on second.This send on second the priority of flow entry lower than forwarding flow entry, works as stream
When amount cannot match forwarding flow entry, gateway is sent to handle in flow entry by sending in matching second.When switching equipment and control
When connection between device processed restores, flow entry is sent in activation first, send flow entry in disabling second, make to generate during disconnection
New flow again on send controller, request issues forwarding flow entry, restores normal forwarding.As it can be seen that being produced during being disconnected for connection
Raw new flow, the embodiment of the present invention still ensure that normal forwarding, do not stop, and improve the reliability of SDN network.
Now still by taking Fig. 1 as an example, message answering is introduced.
It is assumed that the IP address of VM1~VM6 is 10.0.0.1~10.0.0.6, the MAC Address of VM1~VM6 is reduced to MAC1
~MAC6 is indicated；The IP address of gateway GW is 10.0.0.254, and the MAC Address of GW is MAC_GW.
Assuming that the connection between OVS1 and controller Controller has disconnected, OVS1 disables message up sending Controller
Flow entry, activate message up sending GW flow entry.And the existing forwarding flow entry for instructing flow from VM1 to VM5 on OVS1,
As shown in table 3, only example goes out to forward the partial information of flow entry the forwarding flow entry.It can be seen that and turn from the forwarding flow entry
There are the corresponding relationships of IP address and MAC Address in hair flow entry.
| Source IP address | Source MAC | Purpose IP address | Target MAC (Media Access Control) address |
| 10.0.0.1 | MAC1 | 10.0.0.5 | MAC5 |
Table 3
When VM1 sends DHCP request message, own MAC address MAC1 is carried in the DHCP request message.OVS1 connects
After the DHCP request message for receiving VM1 transmission, first according to the message characteristic in aforementioned table 1, confirm that received message is DHCP
Then request message inquires the forwarding flow entry of local record, forwarding flow entry shown in discovery table 3 includes the MAC Address of VM1
Therefore MAC1 obtains IP address 10.0.0.1 corresponding with MAC1, IP address 10.0.0.1 is carried in dhcp response message
In be sent to VM1 so that the IP address that VM1 had both made can still to get after restart for its distribution, prevents flow interrupt.
When VM1 sends ARP request message, the IP address 10.0.0.5 of VM5 is carried in ARP request message.OVS1 connects
After the ARP request message for receiving VM1 transmission, according to the message characteristic in table 1, confirm that received message is ARP request message, so
Afterwards, the forwarding flow entry of local record is inquired, forwarding flow entry shown in discovery table 3 includes the IP address 10.0.0.5 of VM5, because
This, obtains MAC Address MAC5 corresponding with IP address 10.0.0.5, and MAC Address MAC5 is carried and is sent in arp response message
To VM1, so that the ARP entry of the VM5 recorded in VM1 is timely updated, flow interrupt is prevented.
When VM1 sends the ARP request message for carrying IP address 10.0.0.6, the forwarding flow table of OVS1 inquiry local record
, when not finding the forwarding flow entry comprising IP address 10.0.0.6, therefore, obtain the MAC Address MAC_ of the GW of local record
MAC_GW carrying is sent to VM1 by GW in arp response message, and VM1 is using the MAC Address MAC_GW of GW as being sent to VM6's
The target MAC (Media Access Control) address of flow after the flow reaches OVS1, matches the higher forwarding flow entry of priority first, if forwarding flow table
There is no the forwarding flow entry that target MAC (Media Access Control) address is MAC_GW (for example, the forwarding flow entry that target MAC (Media Access Control) address is MAC_GW in
Aging), then by sending flow entry in matching priority lower second, gateway is above sent, is forwarded by gateway.
Corresponding with the embodiment of aforementioned message answer method, the present invention also provides the embodiments of message answering device.
The embodiment of message answering device of the present invention can be applied on switching equipment.Installation practice can pass through software
It realizes, can also be realized by way of hardware or software and hardware combining.Taking software implementation as an example, as on a logical meaning
Device, be that corresponding computer program instructions are formed in the processor run memory by equipment where it.From hardware
For level, as shown in figure 3, for a kind of hardware structure diagram of equipment where message answering device of the present invention, in addition to shown in Fig. 3
Except processor and nonvolatile memory, equipment in embodiment where device generally according to the equipment actual functional capability,
It can also include other hardware, this is repeated no more.
Referring to FIG. 4, for the structural schematic diagram of the message answering device in one embodiment of the invention.Message response dress
It sets and is obtained including message receiving unit 401, message determination unit 402, first acquisition unit 403, list item judging unit 404, second
Unit 405 and message is taken to respond unit 406, in which:
Message receiving unit 401, for receiving the message of user terminal transmission；
Message determination unit 402, for determining whether received message is ground when the connection of detection and control device disconnection
Location request message；
First acquisition unit 403, for obtaining the Address requests when determining received message is Address requests message
The first address carried in message；
List item judging unit 404, for judging whether there is the forwarding flow entry comprising first address, the forwarding
Record has the first address and two address corresponding relationship in flow entry；
Second acquisition unit 405, for obtaining the forwarding flow when there is the forwarding flow entry comprising first address
The second address in list item；
Message responds unit 406, for responding address response message to the user terminal, in the address response message
Carry second address.
Further,
The message determination unit 402, specifically for obtaining the message characteristic of preset Address requests message；It is connect when described
When the message characteristic of the message of receipts is identical as the message characteristic of the preset Address requests message, the received message is determined
For Address requests message.
Further,
The Address requests message is DHCP request message, and first address is that the current user for initiating Address requests is whole
The MAC Address at end, second address are the IP address of the user terminal, and the address response message is dhcp response report
Text.
Further,
The Address requests message is ARP request message, and first address is that the current user for initiating Address requests is whole
The IP address of known purpose user terminal is held, second address is the MAC Address of the purpose user terminal, the address
Response message is arp response message.
Further,
The second acquisition unit 405 is also used to when there is no the forwardings of the IP address comprising the purpose user terminal
When flow entry, the MAC Address of gateway is obtained；
The message responds unit 406, is also used to for the MAC Address of the gateway being added to and is sent to the user
In the arp response message of terminal, so that flow is sent to gateway according to the MAC Address of the gateway by the user terminal
Equipment carries out flow forwarding by gateway.
The function of each unit and the realization process of effect are specifically detailed in the above method and correspond to step in above-mentioned apparatus
Realization process, details are not described herein.
For device embodiment, since it corresponds essentially to embodiment of the method, so related place is referring to method reality
Apply the part explanation of example.The apparatus embodiments described above are merely exemplary, wherein described be used as separation unit
The unit of explanation may or may not be physically separated, and component shown as a unit can be or can also be with
It is not physical unit, it can it is in one place, or may be distributed over multiple network units.It can be according to actual
The purpose for needing to select some or all of the modules therein to realize the present invention program.Those of ordinary skill in the art are not paying
Out in the case where creative work, it can understand and implement.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.
Claims (4)
1. a kind of message answer method is applied on switching equipment, which is characterized in that this method comprises:
Receive the message that user terminal is sent；
When the connection of detection and control device disconnects, determine whether received message is Address requests message；
When determining received message is Address requests message, the first address carried in the Address requests message is obtained；
Judge whether there is the forwarding flow entry comprising first address, in the forwarding flow entry record have the first address and
Two address corresponding relationship；
When there is the forwarding flow entry comprising first address, the second address in the forwarding flow entry is obtained；
Address response message is responded to the user terminal, carries second address in the address response message；
The Address requests message is ARP request message, and first address is currently to have initiated the user terminal of Address requests
The IP address for the purpose user terminal known, second address are the MAC Address of the purpose user terminal, the address response
Message is arp response message；
When the forwarding flow entry of the IP address comprising the purpose user terminal is not present, preset gateway is obtained
MAC Address；
The MAC Address of the gateway is added in the arp response message for being sent to the user terminal, so that the use
MAC Address transmitted traffic of the family terminal based on the gateway；
When the switching equipment receives the flow, and the flow matches forwarding flow entry not successfully, based on sharp in advance
The flow is sent to gateway by the flow entry that gateway is sent on living, carries out flow forwarding by gateway.
2. the method as described in claim 1, which is characterized in that whether the received message of determination is Address requests message,
Include:
Obtain the message characteristic of preset Address requests message；
When the message characteristic of the received message is identical as the message characteristic of the preset Address requests message, institute is determined
Stating received message is Address requests message.
3. a kind of message answering device, it is applied on switching equipment, which is characterized in that the device includes:
Message receiving unit, for receiving the message of user terminal transmission；
Message determination unit, for determining whether received message is Address requests when the connection of detection and control device disconnection
Message；
First acquisition unit, for obtaining in the Address requests message when determining received message is Address requests message
The first address carried；
List item judging unit, for judging whether there is the forwarding flow entry comprising first address, the forwarding flow entry
Middle record has the first address and two address corresponding relationship；
Second acquisition unit, for obtaining in the forwarding flow entry when there is the forwarding flow entry comprising first address
The second address；
Message responds unit, for responding address response message to the user terminal, carries institute in the address response message
State the second address；
The Address requests message is ARP request message, and first address is currently to have initiated the user terminal of Address requests
The IP address for the purpose user terminal known, second address are the MAC Address of the purpose user terminal, the address response
Message is arp response message；
The second acquisition unit is also used to when there is no the forwarding flow entrys of the IP address comprising the purpose user terminal
When, obtain the MAC Address of preset gateway；
The message responds unit, is also used to for the MAC Address of the gateway being added to and is sent to the user terminal
In arp response message, so that MAC Address transmitted traffic of the user terminal based on the gateway；
Flow transmission unit, for receiving the flow when the switching equipment, and the flow matches forwarding flow not successfully
When list item, based on the flow entry for sending gateway on being previously active, the flow is sent to gateway, by gateway
Carry out flow forwarding.
4. device as claimed in claim 3, it is characterised in that:
The message determination unit, specifically for obtaining the message characteristic of preset Address requests message；When the received report
When the message characteristic of text is identical as the message characteristic of the preset Address requests message, determine that the received message is address
Request message.
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| CN108696434B (en) * | 2017-04-11 | 2022-01-14 | 华为技术有限公司 | Method, equipment and system for forwarding data message |
| CN106973126A (en) * | 2017-05-26 | 2017-07-21 | 杭州迪普科技股份有限公司 | A kind of arp reply method and device |
| CN110224942B (en) * | 2018-03-01 | 2023-08-04 | 中兴通讯股份有限公司 | Message processing method, device and storage medium |
| CN110011917B (en) * | 2019-03-21 | 2021-05-07 | 新华三技术有限公司 | Message forwarding method and device, electronic equipment and storage medium |
| CN111726295B (en) * | 2020-06-28 | 2023-04-07 | 北京天融信网络安全技术有限公司 | Message processing method and device, network equipment and computer readable storage medium |
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| CN104219340A (en) * | 2014-09-25 | 2014-12-17 | 杭州华三通信技术有限公司 | ARP (Address Resolution Protocol) response proxy method and apparatus |
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| CN104219340A (en) * | 2014-09-25 | 2014-12-17 | 杭州华三通信技术有限公司 | ARP (Address Resolution Protocol) response proxy method and apparatus |
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