WO2020011135A1

WO2020011135A1 - Packet transmission

Info

Publication number: WO2020011135A1
Application number: PCT/CN2019/095137
Authority: WO
Inventors: 单丽娜
Original assignee: 新华三技术有限公司
Priority date: 2018-07-09
Filing date: 2019-07-08
Publication date: 2020-01-16
Also published as: CN108989173B; CN108989173A

Abstract

A method comprises: an AC receiving a first address resolution protocol (ARP) request packet to be broadcasted, the first ARP request packet carrying a first wireless payload; determining a target virtual BSS interface corresponding to a VLAN to which the first ARP request packet belongs and a target AP covering the target virtual BSS interface; modifying a prestored second ARP request packet according to the first wireless payload of the first ARP request packet and prestored encapsulation information, the encapsulation information comprising radio frequency information of the target virtual BSS interface and next-hop address information corresponding to the target AP; and transmitting the modified second ARP request packet to the target AP. The present invention can enhance processing efficiency of an AC.

Description

Message transmission

Cross-reference to related applications

This application claims priority from a Chinese patent application filed with the Chinese Patent Office on July 9, 2018, with the application number 201810744809.3, and the invention name is "A Method and Device for Message Transmission", the entire contents of which are incorporated herein by reference. in.

Background technique

At present, an access controller (English: Access Controller, AC for short) and an access point (English: Access Point, AP for short) are usually set in a wireless network. The AC will establish and maintain at least one virtual basic service for the AP. Set (English: Basic Service Set, referred to as BSS) interface. The virtual BSS interface may belong to the same virtual local area network (English: Virtual Local Area Network, abbreviated as VLAN), or may belong to different VLANs.

After the AC receives the first Address Resolution Protocol (ARP) request message sent by the sender in a certain VLAN, for each virtual BSS interface in the VLAN, the AC responds to the first The ARP request message is copied, and then the first ARP request is encapsulated for the virtual BSS interface to obtain a second ARP request message, and then the second ARP request message is sent to the target AP to which the virtual BSS interface belongs. For example, an AC supporting 2048 APs usually needs to maintain more than 60,000 virtual BSS interfaces. If these virtual BSS interfaces belong to the same VLAN, when the AC receives ARP request packets in this VLAN, the AC needs to apply More than 60,000 copies of the ARP request message are then encapsulated and then forwarded to each virtual BSS interface.

Brief description of the drawings

FIG. 1 is an example diagram of a network system provided by an embodiment of the present application; FIG.

2 is a flowchart of a message transmission method according to an embodiment of the present application;

3 is a flowchart of a method for modifying a second ARP request message according to an embodiment of the present application;

4 is a schematic structural diagram of a message transmission apparatus according to an embodiment of the present application;

5 is a schematic structural diagram of a message transmission apparatus according to an embodiment of the present application;

6 is a schematic structural diagram of a message transmission apparatus according to an embodiment of the present application;

FIG. 7 is a schematic structural diagram of an AC according to an embodiment of the present application.

detailed description

In order to make the foregoing objects, features, and advantages of the present application more comprehensible, the present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

In the prior art, after the AC receives the first ARP request packet sent by the sender in a VLAN, the AC copies the first ARP request packet for each virtual BSS interface in the VLAN. Then encapsulate the first ARP request for the virtual BSS interface to obtain a second ARP request message, and then send the second ARP request message to the target AP to which the virtual BSS interface belongs. In this case, when there are many virtual BSS interfaces in the same VLAN, the AC needs to consume a large amount of resources to process the replication and encapsulation of ARP request packets, resulting in low processing efficiency of the AC.

The embodiment of the present application provides a message transmission method, and the method can be applied to a scenario where an AC broadcasts an ARP request message. As shown in FIG. 1, this is an example diagram of a network system provided in an embodiment of the present application. The system includes: an AC, an access switch, AP1, AP2, terminal 1, terminal 2, and terminal 3. Among them, the AC is connected to AP1 and AP2 through the access switch, and the service set identifiers (English: Service Set Identifier, SSID) provided by AP1 and AP2 are SSID1 and SSID2 respectively, and the AC is established by SSID1 of AP1 and SSID2 of AP2. It also maintains virtual BSS interface 1 and virtual BSS interface 2. Terminals 1 and 2 access the network through AP1 and AP2, respectively, and terminal 3 accesses the network through the access switch. Among them, the virtual BSS interface 1, the virtual BSS interface 2, the interface of the access switch connected to terminal 3, and the interface of the AC connected to the access switch belong to VLAN 1.

An embodiment of the present application provides a method for transmitting a message, and the method is applied to an AC. The AC may determine the target virtual BSS interface corresponding to the VLAN to which the first ARP request message belongs and the target AP to which the target virtual BSS interface belongs according to the received first ARP request message, and then, according to the first ARP request message, The first wireless payload and the pre-stored encapsulation information directly modify the pre-stored second ARP request message, eliminating the need to duplicate the first ARP request message, which improves the processing efficiency of the AC. As shown in Figure 2, the specific processing flow is as follows:

Step 201: Receive a first ARP request message to be broadcast.

The first ARP request message carries a first wireless payload (English: Wireless Payload).

In implementation, when a terminal needs to obtain the MAC address corresponding to the first terminal according to the Internet Protocol (English: Internet, Protocol, IP for short) address of another terminal (which may be referred to as the first terminal), the terminal may send an ARP request message. . In this scenario, the first wireless payload may include a sender IP address, a sender MAC address, and a receiver (ie, the first terminal) IP address. Or, when the terminal obtains its own IP address through Dynamic Host Configuration Protocol (English: Dynamic Host Configuration Protocol, DHCP), in order to prevent the acquired IP address from conflicting with the IP address of other terminals, the terminal can send an ARP request. Message.

In one example. Referring to FIG. 1, when the terminal 3 needs to communicate with the terminal 2, the terminal 3 may query the MAC address of the terminal 2 in a locally pre-stored ARP table according to the IP address of the terminal 2. If the MAC address of terminal 2 is not stored in the ARP table, terminal 3 may send a first ARP request message to the access switch. For example, in the first wireless payload carried in the first ARP request message sent by the terminal 3, the sending end IP address is the IP address of the terminal 3, the sending end MAC address is the MAC address of the terminal 3, and the receiving end IP address Is the IP address of terminal 2. After receiving the first ARP request message, the access switch may add VLAN information to the first ARP request message according to a preset VLAN policy. Subsequently, the access switch may send the first ARP request packet to the AC according to the VLAN information.

The AC may receive a first ARP request message sent by the terminal through the access switch, where the first ARP request message carries the first wireless payload and VLAN information.

Optionally, for the case where the terminal accesses the network through the AP, the first ARP request message sent by the terminal (such as terminal 1) may also carry a protocol header, which includes an Ethernet header, an IP header, and user data. Report protocol (English: UserDatagramProtocol, UDP for short) header, control and configuration protocol (English: Control and Wireless Access Points Protocol, CAPWAP) for wireless access point. The access switch queries the local pre-stored forwarding table according to the destination MAC address in the Ethernet header, and sends the first ARP request message to the AC through the interface connected to the AC.

Step 202: Determine a target virtual BSS interface corresponding to the VLAN to which the first ARP request message belongs, and a target AP to which the target virtual BSS interface belongs.

In implementation, the AC may store the correspondence between the AP, the virtual BSS interface, and the VLAN in advance. After receiving the first ARP request message, the AC can analyze the first ARP request message to obtain the VLAN information carried in the first ARP request message. Then, the AC may query the target virtual BSS interface corresponding to the VLAN and the AP corresponding to the target virtual BSS interface (that is, the target AP) according to the VLAN information.

For example, as shown in Table 1, virtual BSS interface 1 and virtual BSS interface 3 both belong to AP1, and virtual BSS interface 1 belongs to VLAN 1, virtual BSS interface 3 belongs to VLAN 2, virtual BSS interface 2 and virtual BSS interface 4 belong to AP2, and Virtual BSS interface 2 belongs to VLAN1, virtual BSS interface 4 belongs to VLAN2, and the VLAN information carried in the first ARP request message is VLAN1. The AC determines the target virtual BSS interface as virtual BSS interface 1 and virtual BSS interface 2 and AP1 and AP2 as target APs according to VLAN 1 carried in the first ARP request message.

Table I

虚拟BSS接口Virtual BSS interface	APAP	VLANVLAN
11	AP1AP1	11
22	AP2AP2	11
33	AP1AP1	22
44	AP2AP2	22

Step 203: Modify the pre-stored second ARP request message according to the first wireless payload of the first ARP request message and the pre-stored encapsulation information.

The encapsulation information includes radio frequency information of the target virtual BSS interface and next hop address information corresponding to the target AP.

In implementation, during the process of establishing a connection between the AC and the AP, the AC can generate a forwarding table based on the information of the AP. The forwarding table includes several forwarding entries, and each forwarding entry includes an index value, a destination address, and a next-hop VLAN. , Next hop MAC address and characteristic value. The characteristic value is generated according to the forwarding information corresponding to the AP in the forwarding table. In the forwarding table, each feature value in the forwarding table can uniquely identify the forwarding information corresponding to an AP. When the forwarding information corresponding to an AP in the forwarding table is updated, the characteristic value is also updated accordingly. The characteristic value may be a devil number or other character string, which is not limited in this application. In addition, the characteristic value may be randomly assigned by the AC, or may be calculated by the AC according to a preset characteristic value algorithm (such as a hash algorithm) and forwarding information.

Refer to Table 2 for an example of forwarding representation provided in the embodiment of the present application.

Table II

索引值Index value	目的地址Destination address	下一跳VLANNext hop VLAN	下一跳MAC地址Next hop MAC address	特征值Eigenvalues
11	AP1AP1	VLAN1VLAN1	MAC1MAC1	0x5a5a5a5a0x5a5a5a5a

The index value is used to uniquely identify a forwarding entry; the destination address is the IP address of the AP; the next-hop VLAN and next-hop MAC address are the next-hop VLAN and next-hop MAC corresponding to the AP.

After an AP establishes a connection with the AC, the AC may allocate a buffer space for the AP, and the buffer space may include a preset number of data blocks, where each data block may store a second ARP request message. The number of data blocks (that is, the preset number) is greater than or equal to the number of virtual BSS interfaces corresponding to the AP.

The second ARP request packet is an ARP packet obtained by the AC, including a protocol header and a wireless payload. Among them, the protocol header includes an Ethernet header, an IP header, a UDP header, and a CAPWAP header. The encapsulation process of the second ARP request message may be as follows.

The AC may generate a second ARP request message according to the address information of the device, the address information of each AP, and the next hop address information of each AP in the current forwarding table. The address information may include an IP address, a MAC address, a UDP port number, and the like, and the next hop address information may include a next hop VLAN, a next hop MAC address, and next hop exit information.

For example, referring to Table 2, the AC can set the source MAC address in the Ethernet header to the MAC address of the AC, the destination MAC address to the next hop MAC address (that is, MAC1), and the VLAN to the next hop VLAN (that is, VLAN1). ; Set the source IP address in the IP header to the IP address of the AC, the destination IP to the IP address of AP1, the source port number in the UDP header to the UDP port number of the AC, and the destination port number to the UDP port of AP1 number.

In addition, for each AP, the AC may also create the AP information table, and the AP information table is a table for storing AP information of each AP. The AC may store the characteristic value and index value of the AP in the forwarding table into the AP information table, and set the characteristic value in the data block corresponding to the AP as the characteristic value of the AP in the forwarding table. The characteristic value is generated according to the forwarding information corresponding to the AP. In the AP information table, each feature value in the AP information table can uniquely identify forwarding information corresponding to an AP (that is, an entry corresponding to the AP in the forwarding table). Subsequently, the characteristic value of the AP in the forwarding table and the characteristic value of the AP in the AP information table can be compared to determine whether the forwarding information corresponding to the AP has been updated. The characteristic value may be a devil number or other character string, which is not limited in this application. In addition, the AP information table may further include next hop address information corresponding to the AP, and the next hop address information may include next hop VLAN, next hop MAC address, and next hop exit information.

After the AC determines the target virtual BSS interface and target AP, it can randomly select a data block in the buffer space, and then modify the data block in the data block according to the first wireless payload of the first ARP request message and the pre-stored encapsulation information. The second ARP request message.

For example, the next-hop MAC address and next-hop VLAN in the Ethernet header can be modified; the radio frequency information in the CAPWAP header; and the check field in the second ARP request message. The specific modification process will be explained in detail later.

Optionally, when an AP goes offline, the AC can release the cache space corresponding to the AP.

Optionally, when the number of target virtual BSS interfaces is multiple, the AC may select multiple data blocks in the buffer space, and according to the first wireless payload of the first ARP request message and the pre-stored encapsulation information, respectively, Modify the second ARP request message in each data block.

Step 204: Send the modified second ARP request message to the target AP.

In implementation, after the AC modifies the second ARP request message, it can send the modified second ARP request message to the target AP.

Optionally, before modifying the second ARP request message, the AC can also determine whether the next hop address information corresponding to the target AP has changed, and then determine what needs to be modified in the second ARP request message according to the determination result. As shown in Figure 3, the specific process is as follows:

Step 301: Obtain a first feature value corresponding to the target AP and a second feature value corresponding to a pre-stored second ARP request message.

The first feature value and the second feature value are generated according to the forwarding information corresponding to the target AP.

In implementation, after the AC determines the target virtual BSS interface and the target AP, it can obtain the first characteristic value corresponding to the target AP and the second characteristic value corresponding to the second ARP request message, and the second characteristic value corresponding to the second ARP request message. The feature value is a feature value stored in a data block corresponding to the second ARP request message. The number of second ARP request messages is multiple. In this embodiment, the implementation manners of obtaining the first feature value corresponding to the target AP may be various. The embodiments of this application provide several feasible ways, as follows:

Method one is to obtain the feature value corresponding to the target AP stored in the forwarding table.

In implementation, after determining the target AP, the AC may directly query the feature value corresponding to the target AP in the forwarding table.

Manner 2: For the first second ARP request message in the plurality of second ARP request messages, the step of obtaining the first characteristic value corresponding to the target AP may include: obtaining the IP address of the target AP corresponding to the forwarding table. An index value, according to which the third feature value corresponding to the index value is queried in the forwarding table; if the third feature value is the same as the feature value in the AP information of the target AP stored in advance, the feature in the AP information is Value as the first feature value; if the third feature value is not the same as the feature value in the pre-stored AP information of the target AP, the feature value in the AP information is modified to the third feature value, and the modified AP information is modified The eigenvalue in is used as the first eigenvalue. Obtaining a first feature value corresponding to the target AP for other second ARP request messages in the plurality of second ARP request messages includes: obtaining the feature value in the AP information of the target AP as the first feature value

In implementation, for the first second ARP request message among multiple second ARP request messages, the AC may obtain the index value and characteristic value corresponding to the target AP in the AP information table, and then transfer the The feature value corresponding to the target AP is queried during publishing (for convenience of distinction, it is called the third feature value). Then, the AC may determine whether the third feature value is the same as the feature value in the AP information of the target AP. If they are the same, it means that the next hop address information corresponding to the target AP in the forwarding table has not changed. The AC uses the characteristic value of the target AP in the AP information as the first characteristic value. If it is not the same, it indicates that the target AP in the forwarding table corresponds to The AC's next hop address information changes, the AC can modify the characteristic value of the target AP in the AP information to a third characteristic value, and use the characteristic value of the target AP in the modified AP information as the first characteristic value. Subsequently, for other second ARP request messages in the multiple second ARP request messages, the AC can directly obtain the first characteristic value from the AP information of the target AP without querying the forwarding table. Due to the time required to query the forwarding table It is longer. Therefore, based on the above processing, query time can be effectively reduced, and AC processing efficiency is improved.

In step 302, it is determined whether the first characteristic value is the same as the second characteristic value. If so, step 303 is performed; otherwise, step 304 is performed.

Step 303: Modify the pre-stored second ARP request message according to the first wireless payload of the first ARP request message and the radio frequency information of the target virtual BSS interface.

In implementation, if the first characteristic value is the same as the second characteristic value, it means that the destination MAC and VLAN in the Ethernet header in the second ARP request message need not be modified, and the AC only needs to perform The first wireless payload and the radio frequency information of the target virtual BSS interface modify the second ARP request message. The specific processing process includes the following steps:

Step 1: Modify the parameter value of the preset parameter in the second wireless payload of the second ARP request message to the parameter value of the preset parameter in the first wireless payload. The preset parameter includes the sending end IP address, Sending MAC address and receiving IP address.

In implementation, the AC may correspondingly modify the sender IP address, sender MAC address, and receiver IP address in the second wireless payload of the second ARP request message to the first carried in the first ARP request message. The sender IP address, sender MAC address, and receiver IP address in the wireless payload.

For example, the sending end IP address in the first wireless payload carried in the first ARP request message is 2.0.0.100, the sending end MAC address is 00: 00: 12: 12: 80: 15, and the receiving end IP address is 2.0 .0.11, the AC can modify the sender's IP address in the second ARP request packet to 2.0.0.100, the sender's MAC address to 00: 00: 12: 12: 80: 15, and the receiver's IP address to 2.0 .0.11.

Step 2: Modify the radio frequency information in the CAPWAP header in the second ARP request message to the radio frequency information of the target virtual BSS interface.

In implementation, the AC may correspondingly modify the radio frequency information in the CAPWAP header in the second ARP request message to the radio frequency information of the target virtual BSS interface. For example, if the radio frequency information of the target virtual BSS interface is 1, the AC may modify the radio frequency information in the CAPWAP header in the second ARP request packet to 1.

Step 3: Modify the ID field and the check field in the IP header of the second ARP request message according to the maximum transmission unit corresponding to the target AP.

In implementation, the AC may modify the check field in the second ARP request message according to the maximum transmission unit corresponding to the target AP. In addition, the AC can also determine whether the second ARP request message needs to be fragmented according to the maximum transmission unit. If so, the second ARP request message is fragmented and the encapsulation information is modified according to the maximum transmission unit. Fragment identification in the IP header in. The specific fragmentation process belongs to the prior art, which is not repeated in the embodiment of the present application.

Optionally, the execution process of the above steps 1 to 3 is in no particular order.

Step 304: Modify the second ARP request message according to the first wireless payload of the first ARP request message, the next hop address information corresponding to the target AP, and the radio frequency information of the target virtual BSS interface.

In implementation, if the first characteristic value is different from the second characteristic value, it means that the destination MAC address and VLAN in the Ethernet header in the second ARP request packet need to be modified, and the AC needs to modify the The first wireless payload, the radio frequency information of the target virtual BSS interface, and the next hop address information corresponding to the target AP are used to modify the second ARP request message. The specific processing process includes the following steps:

The specific processing procedure is similar to step 1 in step 303, and is not repeated here.

Step 2: Modify the radio frequency information in the CAPWAP header of the control and configuration protocol in the second ARP request message to the radio frequency information of the target virtual BSS interface.

The specific processing procedure is similar to step 2 in step 303, and details are not described herein again.

The specific processing procedure is similar to step 3 in step 303, and details are not described herein again.

Step 4: Modify the destination MAC address and VLAN in the Ethernet header of the second ARP request message to the next hop MAC and next hop VLAN corresponding to the target AP.

In implementation, the AC can obtain the next-hop VLAN and next-hop MAC address corresponding to the target AP from the AP information of the target AP, and then the destination MAC address and VLAN in the Ethernet header of the second ARP request packet can be obtained. Correspond to the next hop MAC address and next hop VLAN corresponding to the target AP. For example, if the next-hop MAC address corresponding to the target AP is MAC1 and the next-hop VLAN is VLAN1, the AC changes the destination MAC address in the Ethernet header of the second ARP request packet to MAC1 and the VLAN to VLAN1.

Optionally, the execution process of the above steps 1 to 4 is in no particular order.

Optionally, when the AC will modify the second ARP request message according to the next-hop MAC and next-hop VLAN corresponding to the target AP, the AC may also modify the characteristic value corresponding to the second ARP request message. The specific process is as follows: If the first characteristic value is different from the second characteristic value, the second characteristic value corresponding to the second ARP request message is modified to the first characteristic value.

In implementation, in order to prevent repeated modification of the Ethernet header in the second ARP request message, the AC modifies the Ethernet header in the second ARP request message according to the next-hop MAC and next-hop VLAN corresponding to the target AP. After the destination MAC and VLAN are set, the second characteristic value corresponding to the second ARP request packet may be modified to the first characteristic value. In this way, if the next-hop address information corresponding to the target AP does not change, there is no need to modify the Ethernet header in the second ARP request packet, thereby improving processing efficiency.

In the embodiment of the present application, the AC may receive a first ARP request message to be broadcast, and the first ARP request message carries a first wireless payload. The AC determines a target virtual BSS interface corresponding to the VLAN to which the first ARP request message belongs, and a target AP to which the target virtual BSS interface belongs, and then according to the first wireless payload and the pre-stored encapsulation information of the first ARP request message, Modify the pre-stored second ARP request message. The encapsulation information includes the radio frequency information of the target virtual BSS interface and the next hop address information of the target AP, and send the modified second ARP request message to the target AP. In this way, the AC only needs to modify the pre-stored second ARP request message according to the first wireless payload of the first ARP request message to be broadcast and the pre-stored encapsulation information, and does not need to duplicate the first ARP request message. Improve AC processing efficiency.

Based on the same technical concept, as shown in FIG. 4, an embodiment of the present application further provides a device for transmitting a message. The device is applied to an AC. The device includes:

The receiving module 410 is configured to receive a first address resolution protocol ARP request message to be broadcast, where the first ARP request message carries a first wireless payload;

A determining module 420, configured to determine a target virtual BSS interface corresponding to a VLAN to which the first ARP request message belongs, and a target AP to which the target virtual BSS interface belongs;

The first modification module 430 is configured to modify the pre-stored second ARP request message according to the first wireless payload of the first ARP request message and the pre-stored encapsulation information, where the encapsulation information includes radio frequency information of the target virtual BSS interface and The next hop address information corresponding to the target AP;

The sending module 440 is configured to send a modified second ARP request message to the target AP.

Optionally, as shown in FIG. 5, the device further includes:

The obtaining module 450 is configured to obtain a first feature value corresponding to the target AP and a second feature value corresponding to a pre-stored second ARP request message, where the first feature value and the second feature value are corresponding to the target AP. Generated by forwarding information;

The first modification module 430 is specifically configured to:

If the first characteristic value is the same as the second characteristic value, modifying the pre-stored second ARP request message according to the first wireless payload of the first ARP request message and the radio frequency information of the target virtual BSS interface;

If the first characteristic value is different from the second characteristic value, the second ARP is modified according to the first wireless payload of the first ARP request message, the next hop address information corresponding to the target AP, and the radio frequency information of the target virtual BSS interface. Request message.

Optionally, the first modification module 430 is specifically configured to:

Modify the parameter value of the preset parameter in the second wireless payload of the second ARP request message to the parameter value of the preset parameter in the first wireless payload. The preset parameter includes the sending end IP address and the sending end MAC. Address and receiving end IP address;

Modify the radio frequency information in the control and configuration protocol CAPWAP header in the second ARP request message into radio frequency information of the target virtual BSS interface;

Modify the ID field and the check field in the IP header of the second ARP request message according to the maximum transmission unit corresponding to the target AP.

Optionally, the next hop address information includes a next hop MAC address and a next hop VLAN;

The first modification module 430 is specifically configured to:

Modify the destination MAC address and VLAN in the Ethernet header of the second ARP request message to the next hop MAC and next hop VLAN corresponding to the target AP;

Optionally, as shown in FIG. 6, the device further includes:

The second modification module 460 is configured to modify the second feature value corresponding to the second ARP request message to the first feature value if the first feature value is different from the second feature value.

Optionally, the number of the second ARP request messages is multiple. For the first second ARP request message in the multiple second ARP request messages, the obtaining module 450 is specifically configured to:

Obtain the corresponding index value of the target AP's IP address in the forwarding table;

Querying the third feature value corresponding to the index value in the forwarding table according to the index value;

If the third feature value is the same as the feature value in the AP information of the target AP stored in advance, using the feature value in the AP information as the first feature value;

If the third feature value is not the same as the feature value in the AP information of the target AP stored in advance, the feature value in the AP information is modified to the third feature value, and the feature value in the modified AP information is used as the first Eigenvalues;

For other second ARP request messages in the plurality of second ARP request messages, the obtaining module 450 is specifically configured to:

Acquire a feature value in the AP information of the target AP as the first feature value.

Based on the same technical concept, as shown in FIG. 7, an embodiment of the present application further provides an AC. The AC includes: a processor 701 and a machine-readable storage medium 702. The machine-readable storage medium 702 stores Machine-executable instructions executed by the processor 701, the machine-executable instructions causing the processor 701 to:

Receiving a first address resolution protocol ARP request message to be broadcast, where the first ARP request message carries a first wireless payload;

Determining a target virtual basic service set BSS interface corresponding to a VLAN to which the first ARP request message belongs, and a target AP to which the target virtual BSS interface belongs;

Modifying a pre-stored second ARP request message according to a first wireless payload of the first ARP request message and pre-stored encapsulation information, where the encapsulation information includes radio frequency information of the target virtual BSS interface and the The next hop address information corresponding to the target AP;

Sending a modified second ARP request message to the target AP.

In an optional embodiment of the present application, the machine-executable instructions further cause the processor 701 to:

Obtaining a first feature value corresponding to the target AP and a second feature value corresponding to the second ARP request message stored in advance, wherein the first feature value and the second feature value are based on the Generated by the forwarding information corresponding to the target AP;

The modifying the pre-stored second ARP request message according to the first wireless payload of the first ARP request message and the pre-stored encapsulation information includes:

If the first characteristic value is the same as the second characteristic value, modify the pre-stored second ARP according to the first wireless payload of the first ARP request message and the radio frequency information of the target virtual BSS interface. Request message

If the first characteristic value is different from the second characteristic value, according to the first wireless payload of the first ARP request message, the next hop address information corresponding to the target AP, and the target virtual value Radio frequency information of the BSS interface, and modify the second ARP request message.

In an optional embodiment of the present application, the machine-executable instructions specifically cause the processor 701 to:

Modify a parameter value of a preset parameter in a second wireless payload of the second ARP request message to a parameter value of the preset parameter in the first wireless payload, and the preset parameter includes Sender IP address, sender MAC address, and receiver IP address;

Modifying the radio frequency information in the control and configuration protocol CAPWAP header in the second ARP request message into radio frequency information of the target virtual BSS interface;

Modifying the ID field and the check field in the IP header of the second ARP request message according to the maximum transmission unit corresponding to the target AP.

In an optional embodiment of the present application, the next hop address information includes a next hop MAC address and a next hop VLAN;

The machine-executable instructions specifically cause the processor 701 to:

Modifying the destination MAC address and VLAN in the Ethernet header of the second ARP request message to the next hop MAC and next hop VLAN corresponding to the target AP;

If the first characteristic value is different from the second characteristic value, modify the second characteristic value corresponding to the second ARP request message to the first characteristic value.

In an optional embodiment of the present application, the number of the second ARP request packets is multiple;

The machine-executable instructions specifically cause the processor 701 to:

For a first second ARP request message among multiple second ARP request messages, obtaining an index value corresponding to the IP address of the target AP in the forwarding table;

Querying a third feature value corresponding to the index value in the forwarding table according to the index value;

If the third feature value is the same as the feature value in the AP information of the target AP, using the feature value in the AP information as the first feature value;

If the third feature value is different from the feature value in the AP information of the target AP, modify the feature value in the AP information to the third feature value, and modify the AP information after the modification The feature value in the first feature value;

For other second ARP request messages among the plurality of second ARP request messages, the acquiring a first feature value corresponding to the target AP includes:

Acquire a feature value in the AP information of the target AP as a first feature value.

As shown in FIG. 7, the network device may further include a communication bus 703. Through the communication bus 703, the processor 701 and the machine-readable storage medium 702 complete communication interaction. The communication bus 703 may be a Peripheral Component Interconnect Standard (English: Peripheral Component Interconnect (PCI) for short) bus or an Extended Industry Standard Architecture (English: Extended Industry Standard Architecture (EISA) bus for short). The communication bus 703 can be divided into an address bus, a data bus, a control bus, and the like.

The machine-readable storage medium 702 may include random access memory (English: Random Access Memory, referred to as RAM), and may also include non-volatile memory (English: Non-Volatile Memory, referred to as NVM), such as at least one disk memory. . In addition, the machine-readable storage medium 702 may also be at least one storage device located remote from the foregoing processor 701.

The processor 701 may be a general-purpose processor 701, including a central processing unit 701 (English: Central Processing Unit, abbreviated as: CPU), a network processor 701 (English: Network Processor, abbreviated as: NP), etc .; it may also be a digital signal processor 701 (English: Digital Signal Processing, referred to as DSP), Application Specific Integrated Circuit (English: Application Specific Integrated Circuit, referred to as ASIC), Field Programmable Gate Array (English: Field-Programmable Gate Array, FPGA) or other Programming logic devices, discrete gate or transistor logic devices, discrete hardware components.

In still another embodiment provided by the present application, a computer-readable storage medium is also provided. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, any one of the foregoing message transmissions is implemented. Steps of the method.

In yet another embodiment provided by the present application, a computer program product containing instructions is also provided, which when executed on a computer, causes the computer to execute the steps of the method for transmitting a message in any of the above embodiments.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions according to the embodiments of the present application are wholly or partially generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, a computer, a server, or a data center. Transmission via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) to another website site, computer, server, or data center. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, a data center, or the like that includes one or more available medium integration. The available medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (Solid State Disk (SSD)), and the like.

Optionally, in this article, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that between these entities or operations There is any such actual relationship or order. Moreover, the terms "including", "comprising", or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or device that includes a series of elements includes not only those elements but also those that are not explicitly listed Or other elements inherent to such a process, method, article, or device. Without more restrictions, the elements defined by the sentence "including a ..." do not exclude the existence of other identical elements in the process, method, article, or equipment that includes the elements.

Each embodiment in this specification is described in a related manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments. In particular, as for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant part may refer to the description of the method embodiment.

The above descriptions are merely preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Any modification, equivalent replacement, and improvement made within the spirit and principle of this application are included in the protection scope of this application.

Claims

A method for message transmission. The method is applied to AC. The method includes:

Receiving a first address resolution protocol ARP request message to be broadcast, where the first ARP request message carries a first wireless payload;

Determining a target virtual basic service set BSS interface corresponding to the virtual local area network VLAN to which the first ARP request message belongs, and a target AP to which the target virtual BSS interface belongs;

Modifying a pre-stored second ARP request message according to a first wireless payload of the first ARP request message and pre-stored encapsulation information, where the encapsulation information includes radio frequency information of the target virtual BSS interface and the The next hop address information corresponding to the target AP;

Sending a modified second ARP request message to the target AP.
The method according to claim 1, further comprising:

Obtaining a first feature value corresponding to the target AP and a second feature value corresponding to the second ARP request message stored in advance, wherein the first feature value and the second feature value are based on the Generated by the forwarding information corresponding to the target AP;

The modifying the pre-stored second ARP request message according to the first wireless payload of the first ARP request message and the pre-stored encapsulation information includes:

If the first characteristic value is the same as the second characteristic value, modify the pre-stored second ARP according to the first wireless payload of the first ARP request message and the radio frequency information of the target virtual BSS interface. Request message

If the first characteristic value is different from the second characteristic value, according to the first wireless payload of the first ARP request message, the next hop address information corresponding to the target AP, and the target virtual value Radio frequency information of the BSS interface, and modify the second ARP request message.
The method according to claim 2, wherein the modifying a pre-stored second ARP request message according to a first wireless payload of the first ARP request message and radio frequency information of the target virtual BSS interface comprises:

Modify a parameter value of a preset parameter in a second wireless payload of the second ARP request message to a parameter value of the preset parameter in the first wireless payload, and the preset parameter includes Sender IP address, sender MAC address, and receiver IP address;

Modifying the radio frequency information in the control and configuration protocol CAPWAP header in the second ARP request message into radio frequency information of the target virtual BSS interface;

Modifying the ID field and the check field in the IP header of the second ARP request message according to the maximum transmission unit corresponding to the target AP.
The method according to claim 2, wherein the next hop address information includes a next hop MAC address and a next hop VLAN;

Modifying the second ARP request message according to the first wireless payload of the first ARP request message, next hop address information corresponding to the target AP, and radio frequency information of the target virtual BSS interface, include:

Modifying the destination MAC address and VLAN in the Ethernet header of the second ARP request message to the next hop MAC and next hop VLAN corresponding to the target AP;

Modify a parameter value of a preset parameter in a second wireless payload of the second ARP request message to a parameter value of the preset parameter in the first wireless payload, and the preset parameter includes Sender IP address, sender MAC address, and receiver IP address;

Modifying the radio frequency information in the control and configuration protocol CAPWAP header in the second ARP request message into radio frequency information of the target virtual BSS interface;

Modifying the ID field and the check field in the IP header of the second ARP request message according to the maximum transmission unit corresponding to the target AP.
The method according to claim 2, further comprising:

If the first characteristic value is different from the second characteristic value, modify the second characteristic value corresponding to the second ARP request message to the first characteristic value.
The method according to claim 2, wherein the number of the second ARP request messages is multiple;

For the first second ARP request message among the plurality of second ARP request messages, obtaining the first feature value corresponding to the target AP includes:

Obtaining the corresponding index value of the IP address of the target AP in the forwarding table;

Querying a third feature value corresponding to the index value in the forwarding table according to the index value;

If the third feature value is the same as the feature value in the AP information of the target AP, using the feature value in the AP information as the first feature value;

If the third feature value is different from the feature value in the AP information of the target AP, modify the feature value in the AP information to the third feature value, and modify the AP information after the modification The feature value in the first feature value;

For other second ARP request messages among the plurality of second ARP request messages, the acquiring a first feature value corresponding to the target AP includes:

Acquire a feature value in the AP information of the target AP as a first feature value.
An AC, comprising: a processor and a machine-readable storage medium, the machine-readable storage medium storing machine-executable instructions executable by the processor, the machine-executable instructions causing the processing Device:

Receiving a first address resolution protocol ARP request message to be broadcast, where the first ARP request message carries a first wireless payload;

Determining a target virtual basic service set BSS interface corresponding to the virtual local area network VLAN to which the first ARP request message belongs, and a target AP to which the target virtual BSS interface belongs;

Modifying a pre-stored second ARP request message according to a first wireless payload of the first ARP request message and pre-stored encapsulation information, where the encapsulation information includes radio frequency information of the target virtual BSS interface and the The next hop address information corresponding to the target AP;

Sending a modified second ARP request message to the target AP.
The AC of claim 7, the machine-executable instructions further cause the processor:

Obtaining a first feature value corresponding to the target AP and a second feature value corresponding to the second ARP request message stored in advance, wherein the first feature value and the second feature value are based on the Generated by the forwarding information corresponding to the target AP;

The modifying the pre-stored second ARP request message according to the first wireless payload of the first ARP request message and the pre-stored encapsulation information includes:

If the first characteristic value is the same as the second characteristic value, modify the pre-stored second ARP according to the first wireless payload of the first ARP request message and the radio frequency information of the target virtual BSS interface. Request message

If the first characteristic value is different from the second characteristic value, according to the first wireless payload of the first ARP request message, the next hop address information corresponding to the target AP, and the target virtual value Radio frequency information of the BSS interface, and modify the second ARP request message.
The AC of claim 8, the machine-executable instructions specifically cause the processor:

Modify a parameter value of a preset parameter in a second wireless payload of the second ARP request message to a parameter value of the preset parameter in the first wireless payload, and the preset parameter includes Sender IP address, sender MAC address, and receiver IP address;

Modifying the radio frequency information in the control and configuration protocol CAPWAP header in the second ARP request message into radio frequency information of the target virtual BSS interface;

Modifying the ID field and the check field in the IP header of the second ARP request message according to the maximum transmission unit corresponding to the target AP.
The AC according to claim 8, wherein the next hop address information includes a next hop MAC address and a next hop VLAN;

The machine-executable instructions specifically cause the processor:

Modifying the destination MAC address and VLAN in the Ethernet header of the second ARP request message to the next hop MAC and next hop VLAN corresponding to the target AP;

Modify a parameter value of a preset parameter in a second wireless payload of the second ARP request message to a parameter value of the preset parameter in the first wireless payload, and the preset parameter includes Sender IP address, sender MAC address, and receiver IP address;

Modifying the radio frequency information in the control and configuration protocol CAPWAP header in the second ARP request message into radio frequency information of the target virtual BSS interface;

Modifying the ID field and the check field in the IP header of the second ARP request message according to the maximum transmission unit corresponding to the target AP.
The AC of claim 8, the machine-executable instructions further cause the processor:

If the first characteristic value is different from the second characteristic value, modify the second characteristic value corresponding to the second ARP request message to the first characteristic value.
The AC according to claim 8, the number of the second ARP request messages is multiple;

The machine-executable instructions specifically cause the processor:

For a first second ARP request message among multiple second ARP request messages, obtaining an index value corresponding to the IP address of the target AP in the forwarding table;

Querying a third feature value corresponding to the index value in the forwarding table according to the index value;

If the third feature value is the same as the feature value in the AP information of the target AP, using the feature value in the AP information as the first feature value;

If the third feature value is different from the feature value in the AP information of the target AP, modify the feature value in the AP information to the third feature value, and modify the AP information after the modification The feature value in the first feature value;

For other second ARP request messages among the plurality of second ARP request messages, the acquiring a first feature value corresponding to the target AP includes:

Acquire a feature value in the AP information of the target AP as a first feature value.
A machine-readable storage medium stores machine-executable instructions. When called and executed by a processor, the machine-executable instructions cause the processor to: implement the method steps of any one of claims 1-6.