CN101808107B - A method, device and system for two-layer intercommunication between a storage device and a user - Google Patents

Abstract

The implementation of the invention relates to a storage device and user communication method in the communication field, including the steps that: address resolution protocol ARP request is received, and the ARP request contains the IP address of a target node; whether the target node is a storage device is judged; if the target node is a storage device, response for storing MAC address of storage device is sent to the requestor, so that user equipment communicates with the storage device by the MAC address of the storage device. The implementation of the invention also provides a device and system for communication between storage device and user. The implementation of the invention effectively avoids that messages between user and storage device need to be forwarded by virtue of a gateway and reduces impact on the gateway.

Description

A method, device and system for two-layer intercommunication between a storage device and a user

technical field

The present invention relates to the field of communication technology, and in particular to a method, device and system for Layer 2 intercommunication between a storage device and a user.

Background technique

For high-bandwidth streaming media services, the industry generally adopts a method of adding storage devices to network devices close to the user side. The storage device can cache part of the content that the user needs to download, and the user can obtain the content from the nearest storage device. Compared with the huge amount of streaming media content, the capacity of the storage device is usually relatively small, and the stored content is limited, so it is difficult for a single storage device to meet the needs of users. Therefore, at present, some content is usually stored on each storage device, and users can obtain content not only from the nearest storage device, but also from other storage devices.

The existing access network architecture includes three parts: broadband gateway (such as BRAS), aggregation network (Aggregation Network), and access network (Access Network). In the process of implementing the present invention, the inventor found that in the existing access network, all users are isolated on the second layer, even the traffic between the user and the nearest storage device must be forwarded through the gateway. With the continuous growth of users and the continuous growth of streaming media services that occupy a large amount of network bandwidth, the architecture of the existing access network leads to excessive traffic passing through the gateway, which becomes a bottleneck in the network.

Contents of the invention

Embodiments of the present invention provide a method, device, and system for Layer 2 intercommunication between a storage device and a user, which prevents messages between the user and the storage device from being forwarded through a gateway and reduces impact on the gateway.

Embodiments of the present invention are achieved through the following technical solutions:

An embodiment of the present invention provides a method for Layer 2 intercommunication between a storage device and a user, including:

receiving an Address Resolution Protocol ARP request, where the ARP request carries the IP address of the destination node;

judging whether the destination node is a storage device;

If the destination node is a storage device, provide the MAC address of the storage device to the client device sending the ARP request, so that the client device communicates with the storage device through the MAC address of the storage device .

An embodiment of the present invention provides a proxy device, including:

The first receiving unit is configured to receive an ARP request, where the ARP request carries the IP address of the destination node;

a judging unit, configured to judge whether the destination node requested in the APR request is a storage device;

A MAC address providing unit, configured to provide the MAC address of the storage device to the client device sending the ARP request when the judging unit determines that the destination node requested in the ARP request is a storage device, so that the The client device communicates with the storage device through the MAC address of the storage device.

An embodiment of the present invention provides an access node, including:

The third receiving unit is configured to receive an address resolution protocol ARP message sent by a storage device belonging to the same virtual local area network VLAN as the access node, and the ARP message carries the MAC address of the storage device; the same VLAN is a VLAN composed of all gateway devices, access nodes, aggregation nodes and storage devices belonging to the same gateway;

The recording unit is used to record the MAC address of the storage device received by the third receiving unit and the processing rules of the message sent to the storage device; the processing rule includes: storing the destination MAC in the received message For the MAC message of the device, modify the VLAN tag to be the tag of the VLAN composed of all gateway devices, access nodes, aggregation nodes and storage devices under the same gateway;

The fourth receiving unit is configured to receive a message sent by the client device;

A sending unit, configured to send the message to the storage device according to the processing rules recorded by the recording unit when the destination MAC of the message received by the fourth receiving unit is the MAC of the storage device.

An embodiment of the present invention provides a system for Layer 2 intercommunication between a storage device and a user, including: an address resolution protocol (ARP) proxy device, a storage device, an access node, and a convergence node. The storage device is hung on the access node or convergence node. node, and the storage device, access node and convergence node belong to the same gateway, and the storage device, access node and convergence node form a virtual local area network (VLAN);

The ARP proxy device is configured to receive an ARP request, and when the requested destination node in the ARP request is a storage device, provide the MAC address of the destination storage device to the client device sending the ARP request;

The access node is configured to, after receiving the packet encapsulated with the MAC address of the storage device, send the message, the processing rule includes: among the received messages, for which the destination MAC is the MAC of the storage device, modify the VLAN tag to be the tag of the VLAN composed of the storage device, the access node and the aggregation node.

It can be seen from the technical solutions provided by the above-mentioned embodiments of the present invention that the proxy device in the embodiments of the present invention can distinguish the destination node of the ARP request to provide the corresponding MAC address, and when the destination node is a storage device, provide the MAC address of the storage device to the The requested client device effectively prevents the messages between the user and the storage device from being forwarded through the gateway, reducing the impact on the gateway.

Description of drawings

FIG. 1 is a flowchart of a method for Layer 2 intercommunication between a storage device and a user according to an embodiment of the present invention;

Fig. 2 is the flow chart of the substeps that step 14 of the method described in Fig. 1 comprises;

FIG. 3 is a flow chart of an example of a method for Layer 2 intercommunication between a storage device and a user according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a message being modified during a message sending process according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a proxy device according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of an access node according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a message sending system according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. It should be understood that the described embodiments are only some of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The embodiment of the present invention discloses a method for Layer 2 intercommunication between a storage device and a user. Taking FIG. 1 as an example, it is an operation flowchart of the method described in this embodiment, including the following steps:

Step 10: receiving an Address Resolution Protocol (ARP, Address Resolution Protocol) request, carrying the IP address of the destination node in the ARP request;

The ARP proxy device receives the ARP request sent by the client device, and the ARP proxy device may be an access node (AN, Access Node), or a broadband gateway, such as a BRAS. The ARP request is a request to obtain a Medium Access Control (MAC, Medium Access Control) address of the destination node.

The IP address of the destination node can be acquired by the client device, and the acquisition method is the prior art, and the embodiment of the present invention does not limit it, for example, it can be through a Dynamic Host Configuration Protocol (DHCP, Dynamic Host Configuration Protocol) server or a content index server to get.

Step 11: judging whether the destination node is a storage device;

In the embodiment of the present invention, all gateway devices, access nodes AN, aggregation nodes and storage devices belonging to the same gateway form a virtual local area network (VLAN, Virtual Local Area Network), and the storage device sends an ARP message in the VLAN. The ARP message carries the MAC address and IP address of the storage device, and the ARP proxy device learns the MAC address and the IP address through the ARP message, and records the correspondence between the MAC address and the IP address, as well as the IP address and/or Or whether the device corresponding to the MAC address is a storage device. Therefore, the AN or BRAS as an ARP proxy device can determine whether the destination node is a storage device according to the recorded correspondence between the MAC address and the IP address, and whether the device corresponding to the IP address and/or the MAC address is a storage device.

If the destination node is a storage device, go to step 12; otherwise, go to step 13.

Step 12: Provide the MAC address of the storage device to the client device sending the ARP request.

The ARP proxy device can search for the MAC address of the storage device corresponding to the IP address of the destination node in the ARP request according to the corresponding relationship between the recorded MAC address and the IP address; provide the IP address found and the destination node in the ARP request The MAC address of the storage device corresponding to the address is given to the client device.

When the client device needs to communicate with the storage device, it can use the obtained MAC address of the storage device to encapsulate the message and send it, so that the communication between the client device and the storage device does not need to go through the gateway device.

Step 13: Provide the MAC address of the gateway to the client device sending the ARP request.

Step 14: The client device communicates with the storage device through the MAC address of the storage device.

Specifically, in this step, the AN may receive the message encapsulated by the client device using the MAC address of the destination storage device, and the MAC address of the storage device is obtained by the method described in the above-mentioned embodiments.

As shown in Figure 2, the process in which the client device communicates with the storage device through the MAC address of the storage device includes the following sub-steps:

Step 140: AN receives the packet sent by the client device and encapsulated with the MAC address of the storage device;

Step 141: According to the MAC address of the recorded storage device and the processing rules of the message sent to the storage device, the AN modifies the virtual local area network VLAN tag of the message to be all gateway devices, access nodes, aggregation nodes and Tags of VLANs composed of storage devices;

The MAC address of the storage device and the processing rules for the message sent to the storage device are obtained from the ARP message sent by the storage device, specifically including: the storage device sends an ARP message in the VLAN, and the ARP The MAC address of the storage device is carried in the message. After receiving the ARP message, each AN in the same VLAN records the MAC address of the storage device and the processing rules for the message sent to the storage device. The processing The rules include: in the received message, the destination MAC is the message of the storage device MAC, and the VLAN tag (VLAN ID) of the modified message is all gateway devices, access nodes AN, aggregation nodes and storage devices of the same gateway. The tag of the VLAN that the device is composed of.

Therefore, after the AN receives the message, it finds that the destination MAC of the message is the MAC of the storage device, and then modifies the VLAN tag of the message to be all gateway devices, access nodes AN, convergence nodes and The tag of the VLAN composed of storage devices.

Step 142: Send the message with the modified VLAN tag to the storage device.

The AN sends the message to the storage device in a VLAN formed by all gateway devices, access nodes AN, aggregation nodes and storage devices of the same gateway.

The ARP proxy device described in this embodiment can distinguish the destination node of the ARP request to provide the corresponding MAC address, and when the destination node is a storage device, provide the MAC address of the storage device to the requesting client device. When communicating with the storage device, the MAC address of the storage device can be used to encapsulate the message and send it. The AN to which the client device belongs can send the message according to the recorded MAC address of the destination storage device and the processing rules, realizing the The traffic between the device and the storage device does not need to be forwarded through the gateway, which reduces the impact on the gateway.

The following is a detailed description of the specific application of the embodiment of the present invention. First, all gateway devices, ANs, aggregation nodes, and storage devices (Cache in this example) under the same gateway need to be formed into a VLAN, that is, the same VLAN ID must be added. , the VLAN is referred to as CacheVLAN, as shown in Figure 3, the ARP proxy device provides the MAC address to the client device and the process of client device and Cache communication includes the following steps:

Step 30: Each Cache device in a Cache VLAN broadcasts an ARP message in the Cache VLAN, and carries the MAC address and the IP address of this Cache in the ARP message;

The ARP packet may be a gratuitous ARP packet.

Step 31: After each AN belonging to the same Cache VLAN with the Cache device receives the ARP message, learn the MAC address of each Cache by the message, record the MAC address of each Cache and the address of the message sent to the storage device Processing rule, described processing rule comprises: in the message that receives, destination MAC is the message of Cache equipment MAC, revises VLAN mark and sends after being Cache VLAN mark (VLAN ID); Belong to the ARP of same Cache VLAN with Cache equipment After receiving the ARP message, the proxy device records the correspondence between the MAC address and the IP address, and whether the device corresponding to the IP address and/or the MAC address is a Cache device.

The ARP proxy device described in this example is a gateway, and it may also be an AN or other devices that perform the ARP function in practical applications.

Step 32: The ARP proxy device receives the ARP request sent by the client device D2, and the ARP request carries the IP address of the destination Cache1;

The client device D2 can determine the IP address of the destination Cache1 through the content index server, such as the electronic program guide in the IPTV system, or other redirection servers, and carry the IP address in the ARP request;

Step 33: The ARP proxy device returns the corresponding MAC address of Cache1 to the client device D2 according to the ARP request;

The ARP proxy device searches for the MAC address of Cache1 corresponding to the IP address of the destination node in the ARP request according to the corresponding relationship between the recorded MAC address and the IP address, and whether the device corresponding to the IP address and/or the MAC address is a Cache device, And find that the destination node Cache1 is a Cache device, then send an ARP response to the client device D2, and return the MAC address of Cache1, for example, the MAC address of Cache1 is mac-c;

If the destination node in the ARP request is not a Cache device, the ARP proxy device returns the MAC address of the gateway (not shown in the figure).

Step 34: The access node AN2 to which the client device D2 is connected receives the message encapsulated by the client device D2 using the MAC address mac-c of the Cache1.

Step 35: AN2 modifies the message VLAN tag to a Cache VLAN tag according to the recorded MAC addresses of each Cache and the processing rules of the message sent to the storage device, and then sends it in the Cache VLAN.

If there is no VLAN tag in the message sent by the client device D2, the Cache VLAN tag is directly added to the message.

Step 36: The device AN1 with Cache1 attached to the side receives the message, and forwards the message to the destination Cache1 device.

If the Cache1 is connected to the AN2, the AN2 directly sends the packet with the modified VLAN tag to the Cache1.

In the above example, when a message needs to be sent to Cache1, the MAC address of Cache1 is obtained first, and the message is encapsulated and sent according to the MAC address of Cache1, so that the message between the client device and Cache does not need to be forwarded through the gateway, which reduces the burden on the gateway. shock. In the above example, the message is only modified once in the AN, that is, the AN modifies the VLAN tag in the message to be the Cache VLAN tag. As shown in Figure 4, above the dotted line is the process of sending the message from the client device D2 to Cache1, and below the dotted line is the process of sending the message from Cache1 to the user device D2. In the message forwarding process in both directions, There is only one modification of the message respectively, that is, after receiving the message, the AN modifies the VLAN tag in the message as a Cache VLAN tag. If there is no VLAN tag in the original message, it will add a Cache VLAN tag. Changed to Cache VLAN tag. In FIG. 4, D1IP represents the destination IP address, that is, the IP address of Cache1, and D2IP represents the source IP address, that is, the IP address of D2.

In practical applications, due to the limited capacity of storage devices attached to the AN side, multiple storage devices are often organized in a P2P manner to share content on different storage devices, that is, P2P is implemented between storage devices. , called P2P AN Cache, the solution of the embodiment of the present invention is still applicable in the scenario of P2P AN Cache. It can be understood that the embodiment of the present invention is also applicable to the case where multiple Caches are side-hung on a sink node or other devices and organized in a P2P manner.

An embodiment of the present invention provides a proxy device. As shown in FIG. 5, the proxy device includes:

The first receiving unit 500 is configured to receive an ARP request, where the ARP request carries the IP address of the destination node;

A judging unit 501, configured to judge whether the destination node requested in the APR request is a storage device;

The MAC address providing unit 502 is configured to provide the MAC address of the storage device to the client device sending the ARP request when the judging unit 501 determines that the requested destination node in the ARP request is a storage device, so that The client device communicates with the storage device through the MAC address of the storage device.

The proxy device may also include:

The second receiving unit 503 is configured to receive an ARP message sent by a storage device belonging to the same VLAN as the proxy device, where the ARP message carries the MAC address and IP address of the storage device;

The storage unit 504 is configured to store the correspondence between the MAC address and the IP address of the storage device carried in the ARP message received by the second receiving unit 503, and whether the device corresponding to the MAC address and/or IP address is a storage device Information.

The proxy device is deployed on an access node or a gateway.

The proxy device in this embodiment realizes judging whether the destination address in the ARP request is a storage device, and returns the MAC address of the storage device if it is a storage device.

The embodiment of the present invention also provides an access node. As shown in FIG. 6, the access node includes:

The third receiving unit 600 is configured to receive an ARP message sent by a storage device belonging to the same VLAN as the access node, where the ARP message carries the MAC address of the storage device; A VLAN composed of all gateway devices, access nodes, aggregation nodes and storage devices under the same gateway;

The recording unit 601 is configured to record the MAC address of the storage device received by the third receiving unit 600 and the processing rules for the messages sent to the storage device, the processing rules include: , the destination MAC is the message of the MAC of the storage device, modify the VLAN tag to be the tag of the VLAN composed of all gateway devices, access nodes, aggregation nodes and storage devices under the same gateway;

The fourth receiving unit 602 is configured to receive a packet sent by the client equipment.

The sending unit 603 is configured to send the message to the storage device according to the processing rule recorded by the recording unit 601 when the destination MAC of the message received by the fourth receiving unit 602 is the MAC of the storage device.

The access node also includes an interface (not shown in the figure) for mounting the storage device on the side, for mounting the storage device on the side.

The access node described in this embodiment can save the MAC address of the storage device and the processing rules of the message sent to the storage device, and forward the message encapsulated with the MAC address of the destination storage device according to the MAC address of the storage device and the processing rule According to the processing rule, all the messages between the client device and the storage device do not need to be forwarded through the gateway, thereby reducing the impact on the gateway.

The embodiment of the present invention also provides a system for Layer 2 intercommunication between a storage device and a user, as shown in FIG. Hanging on the access node 73 or the convergence node 74, as shown in FIG. Under the same gateway device 75, the storage device 72, the access node 73, the convergence node 74 and the gateway device 75 form a VLAN;

The ARP proxy device 71 is configured to receive an ARP request, and when judging that the requested destination node in the ARP request is a storage device, provide the MAC address of the destination storage device to the client device sending the ARP request; the The ARP proxy device can be set on the access node 73 or on the gateway device 75 .

The storage device 72 is configured to broadcast an ARP message in the VLAN, and the ARP message carries the MAC address and IP address of the storage device; the storage device 72 is side-mounted on the access node 73 superior.

The access node 73 is configured to receive and record the MAC address of the storage device and the processing rule for the message sent to the storage device, the processing rule includes: in the received message, the destination MAC is For the message of the storage device MAC, modify the VLAN tag to be the tag of the VLAN formed by the storage device 72, the access node 73, the convergence node 74, and the gateway device 75, and receive the message encapsulated with the MAC address of the storage device After that, the message is sent according to the processing rule.

The ARP agent device of the system described in this embodiment realizes judging whether the destination address in the ARP request is a storage device, if it is a storage device, then returns the MAC address of the storage device, and uses the MAC address of the destination storage device to encapsulate the message when the message is sent , the access node forwards the message according to the destination MAC address of the message and the corresponding processing rules, so that all the messages communicated between the client device and the storage device do not need to be forwarded through the gateway, reducing the impact on the gateway.

In summary, the ARP proxy device in the embodiment of the present invention realizes judging whether the destination address in the ARP request is a storage device, and if it is a storage device, returns the MAC address of the storage device, and uses the MAC address of the destination storage device when sending a message Encapsulate the message, and the access node forwards the message according to the destination MAC address of the message and the corresponding processing rules, so that all the messages communicated between the client device and the storage device do not need to be forwarded through the gateway, reducing the impact on the gateway.

Those skilled in the art can understand that all or part of the steps in the methods of the above embodiments can be implemented by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. The readable storage medium is, for example, a read-only memory (referred to as ROM), a random access memory (referred to as RAM), a magnetic disk, an optical disk, and the like.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (13)

1. A method for two-layer communication between a storage device and a user, comprising: receiving an Address Resolution Protocol ARP request, where the ARP request carries the IP address of the destination node; judging whether the destination node is a storage device; If the destination node is a storage device, provide the MAC address of the storage device to the client device sending the ARP request, so that the client device communicates with the storage device through the MAC address of the storage device ; The judging whether the destination node is a storage device includes: Determine whether the device corresponding to the IP address of the destination node carried in the ARP request is a storage device according to the recorded correspondence between the MAC address and the IP address, and whether the device corresponding to the MAC address and/or the IP address is a storage device. 2. The method according to claim 1, wherein the providing the MAC address of the storage device to the client device sending the ARP request comprises: According to the corresponding relationship between the MAC address and the IP address of the recorded storage device, search for the MAC address of the storage device corresponding to the IP address of the destination node in the ARP request; the corresponding relationship between the MAC address and the IP address of the storage device is determined by the storage Obtained from the ARP packet sent by the device; Providing the found MAC address of the storage device corresponding to the IP address of the destination node in the ARP request to the client device sending the ARP request. 3. The method according to claim 1, wherein the communication between the client device and the storage device through the MAC address of the storage device comprises: The access node receives the packet sent by the client device and encapsulated with the MAC address of the storage device; According to the MAC address of the recorded storage device and the processing rules of the message sent to the storage device, modify the virtual local area network VLAN tag of the message to be composed of all gateway devices, access nodes, aggregation nodes and storage devices under the same gateway VLAN tagging; Send the packet with the modified VLAN tag to the storage device. 4. The method according to claim 3, wherein the MAC address of the storage device and the processing rule of the message sent to the storage device are obtained from the ARP message sent by the storage device. 5. An agent device, characterized in that, comprising: The first receiving unit is configured to receive an ARP request, where the ARP request carries the IP address of the destination node; a judging unit, configured to judge whether the destination node requested in the ARP request is a storage device; A MAC address providing unit, configured to provide the MAC address of the storage device to the client device sending the ARP request when the judging unit determines that the destination node requested in the ARP request is a storage device, so that the The client device communicates with the storage device through the MAC address of the storage device; The judging whether the destination node is a storage device includes: Determine whether the device corresponding to the IP address of the destination node carried in the ARP request is a storage device according to the recorded correspondence between the MAC address and the IP address, and whether the device corresponding to the MAC address and/or the IP address is a storage device. 6. The proxy device according to claim 5, further comprising: The second receiving unit is configured to receive an ARP message sent by a storage device belonging to the same VLAN as the ARP proxy device, and the ARP message carries the MAC address and the IP address of the storage device; the same VLAN is A VLAN composed of all gateway devices, access nodes, aggregation nodes and storage devices belonging to the same gateway; A storage unit, configured to store the correspondence between the MAC address and the IP address of the storage device carried in the ARP message received by the second receiving unit and whether the device corresponding to the MAC address and/or IP address is a storage device information. 7. The proxy device according to claim 5 or 6, wherein the ARP proxy device is deployed in an access node or a gateway. 8. An access node, characterized in that, comprising: The third receiving unit is configured to receive an address resolution protocol ARP message sent by a storage device belonging to the same virtual local area network VLAN as the access node, and the ARP message carries the MAC address of the storage device; the same VLAN is a VLAN composed of all gateway devices, access nodes, aggregation nodes and storage devices belonging to the same gateway; The recording unit is used to record the MAC address of the storage device received by the third receiving unit and the processing rules of the message sent to the storage device; the processing rule includes: storing the destination MAC in the received message For the MAC message of the device, modify the VLAN tag to be the tag of the VLAN composed of all gateway devices, access nodes, aggregation nodes and storage devices under the same gateway; The fourth receiving unit is configured to receive a message sent by the client device; A sending unit, configured to send the message to the storage device according to the processing rules recorded by the recording unit when the destination MAC of the message received by the fourth receiving unit is the MAC of the storage device. 9. The access node according to claim 8, further comprising an interface for side-mounting the storage device, for the side-mounting storage device. 10. A system for Layer 2 intercommunication between a storage device and a user, comprising: an address resolution protocol (ARP) proxy device, a storage device, an access node, and a convergence node, and the storage device is hung on the access node or On the convergence node, and the storage device, the access node and the convergence node belong to the same gateway, the storage device, the access node and the convergence node form a virtual local area network (VLAN); The ARP proxy device is configured to receive an ARP request, and when the requested destination node in the ARP request is a storage device, provide the MAC address of the destination storage device to the client device sending the ARP request; The access node is configured to, after receiving the message encapsulated with the MAC address of the storage device, send the message, the processing rule includes: among the received messages, for which the destination MAC is the MAC of the storage device, modify the VLAN tag to be the tag of the VLAN formed by the storage device, the access node and the aggregation node. 11. The system according to claim 10, wherein the storage device is configured to send an ARP message in the VLAN, and the ARP message carries the MAC address and the IP address of the storage device. 12. The system according to claim 10, wherein the ARP proxy device is set on the access node. 13. The system according to claim 10, further comprising: a gateway device belonging to the same VLAN as the storage device, the access node and the aggregation node, and the ARP proxy device is set on the gateway device.

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