WO2012088901A1 - 一种虚拟局域网的分配方法以及相关装置 - Google Patents
一种虚拟局域网的分配方法以及相关装置 Download PDFInfo
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- WO2012088901A1 WO2012088901A1 PCT/CN2011/078706 CN2011078706W WO2012088901A1 WO 2012088901 A1 WO2012088901 A1 WO 2012088901A1 CN 2011078706 W CN2011078706 W CN 2011078706W WO 2012088901 A1 WO2012088901 A1 WO 2012088901A1
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- Prior art keywords
- mac address
- terminal device
- prefix field
- vlan
- packet
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Classifications
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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
- H04L61/50—Address allocation
- H04L61/5038—Address allocation for local use, e.g. in LAN or USB networks, or in a controller area network [CAN]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2101/00—Indexing scheme associated with group H04L61/00
- H04L2101/60—Types of network addresses
- H04L2101/604—Address structures or formats
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2101/00—Indexing scheme associated with group H04L61/00
- H04L2101/60—Types of network addresses
- H04L2101/618—Details of network addresses
- H04L2101/622—Layer-2 addresses, e.g. medium access control [MAC] addresses
Definitions
- a virtual local area network is a type of network switching device that logically divides a LAN device into a network segment or a smaller local area network, thereby implementing a data exchange technology of a virtual working group, and is mainly applied to a switch. And in the router.
- VLAN virtual local area network
- LANs have the same attributes. Since it is logically divided rather than physically divided, each workstation in the same VLAN is not restricted to the same physical range, that is, these workstations can be on different physical network segments. According to the characteristics of VLANs, broadcast and unicast traffic inside a VLAN are not transferred to other VLANs, which helps control traffic, reduce equipment investment, simplify network management, and improve network security. In addition to dividing the network into multiple broadcast domains, VLANs can effectively control the occurrence of broadcast storms and make the network topology very flexible. It can also be used to control different departments and different sites in the network. Visit each other.
- the most common way to divide a VLAN is based on port division.
- This method adds the same VLAN tag to the packets with no VLAN tags from the same port and forwards the packets in the same VLAN.
- This mode is simple to configure and is applicable to the networking environment where the physical location of the terminal device is relatively fixed. With the popularity of mobile office and wireless access, the terminal device no longer accesses the device through the fixed port. It may use port A to access the network this time, and use port B to access the network next time. If the VLANs of port A and port B are different, the terminal device will be assigned to another VLAN after the second access. The services cannot be used or cannot use the resources in the original VLAN. The configuration is the same. When port B is assigned to another terminal device, access security is introduced.
- MAC Media Access Control
- Embodiments of the present invention provide a method for allocating a virtual local area network and related devices, which are used to quickly and flexibly perform VLAN allocation of a large number of terminal devices.
- the method for allocating a virtual local area network includes: obtaining a media access control MAC address of the terminal device; extracting a prefix field in the MAC address according to a preset extraction rule, where the prefix field is a binary field of the first N bits in the MAC address And the N is greater than or equal to 1, and is less than 48; and the terminal device is allocated a corresponding VLAN tag according to the prefix field.
- the device for distributing a virtual local area network includes: an obtaining unit, configured to acquire a media access control MAC address of the terminal device; and an extracting unit, configured to extract a prefix field in the MAC address according to a preset extraction rule, where The prefix field is a binary field of the first N bits in the MAC address, and the N is greater than or equal to 1, and is less than 48.
- the allocating unit is configured to allocate a corresponding VLAN tag to the terminal device according to the prefix field.
- FIG. 1 is a schematic flowchart of a VLAN allocation method according to an embodiment of the present invention
- FIG. 2 is another schematic flowchart of a VLAN allocation method according to an embodiment of the present invention.
- FIG. 3 is another schematic flowchart of a VLAN allocation method according to an embodiment of the present invention.
- FIG. 4 is a schematic diagram showing the logical structure of a VLAN allocating apparatus according to an embodiment of the present invention.
- the embodiment of the invention provides a method for allocating a virtual local area network and related devices, which are used for quickly and flexibly completing cage allocation of a large number of terminal devices.
- an embodiment of a method for allocating a virtual local area network includes:
- the virtual local area network VLAN allocation device acquires the MAC address of the terminal device.
- the virtual local area network (VLAN) VLAN allocation device is an access device having a Layer 2 function, for example, a switch, a Digital Subscriber Line Access Multiplexer (DSLAM), a router having a Layer 2 function, and the like.
- DSLAM Digital Subscriber Line Access Multiplexer
- the MAC address is the world's only 48-bit (binary) physical address that is burned into the network card by the manufacturer. 0 to 23 of the MAC address is the Organizationally Unique Identifier (OUI), and 0UI is a unique identifier assigned to various organizations by the Institute of Electrical and Electronics Engineers (IEEE). To identify nodes in the LAN; 24 to 47 bits of the MAC address are assigned by the manufacturer.
- UMI Organizationally Unique Identifier
- IEEE Institute of Electrical and Electronics Engineers
- the VLAN allocating device extracts a prefix field in the MAC address according to a preset extraction rule, and the prefix field is a binary field of the first N bits in the MAC address, and N is greater than or equal to 1, and less than 48.
- the 0UI of its MAC address is definitely the same (that is, the first 24 bits are the same). If the terminal equipment produced by the same company or manufacturer is the same type of product (such as a digital set-top box), the field with the same prefix portion of the MAC address may be longer (that is, the larger the value of N).
- the administrator can flexibly set the N value according to the actual situation of the type, quantity, and distribution of various terminal devices in the enterprise, so that the management is convenient and the terminal can be acquired as much as possible.
- Device information When performing VLAN assignment of a terminal device, the administrator can flexibly set the N value according to the actual situation of the type, quantity, and distribution of various terminal devices in the enterprise, so that the management is convenient and the terminal can be acquired as much as possible. Device information.
- the VLAN allocating device allocates a corresponding VLAN tag to the terminal device according to the prefix field.
- the prefix field and the corresponding VLAN tag are stored, and the mapping relationship between the prefix field and the corresponding VLAN tag is established.
- Each type of terminal device has different service application requirements, needs to be allocated to the corresponding VLAN, and obtains corresponding network resources, and the same type of terminal device often has the same prefix field, and the VLAN allocation device can distinguish different according to the prefix field.
- Type of terminal device and can assign phases to multiple terminal devices of the same type
- the same VLAN tag avoids the problem of accurate static binding of MAC addresses and VLANs—the amount of data caused by one-to-one relationship is large and difficult to maintain.
- the invention extracts a prefix field in a MAC address, and allocates a corresponding VLAN tag to the terminal device according to the prefix field. If a terminal device with multiple prefix fields needs to allocate a VLAN tag, the present invention can uniformly be a plurality of terminals. The device divides the VLANs, so that these terminal devices with the same prefix field have the same VLAN tag, which reduces the burden on the switch and improves the speed of allocating queries.
- the present invention provides an achievable method for extracting a prefix field.
- another embodiment of the method for allocating a virtual local area network according to the present invention includes: 201. Obtaining a terminal MAC address of the device;
- the VLAN assignment device acquires the MAC address of the terminal device that needs to assign a VLAN tag.
- the VLAN allocation device queries the mask corresponding to the MAC address.
- a mask matching the prefix field of the MAC address is preset in the VLAN allocating device, that is, if the prefix field is the first N bits of the MAC address, the first N bits of the mask are "1", and the remaining 48 minus N The bit is "0", for example: If the prefix field is 32 bits (1234-5678-xxxx), the mask is ffff-ffff_0000.
- the role of the mask is to mask out fields other than the prefix field in the MAC address, so that the computer separately identifies the prefix field in the MAC address.
- the VLAN allocating device performs a logical AND operation on the MAC address and the corresponding mask to obtain a prefix field.
- the mask length configuration is shorter. That is, the "1" configuration of the first few bits of the mask is less); if the number of terminals is small, a longer mask can be configured to achieve more precise configuration and control (that is, the "1" configuration of the first few bits of the mask is more some).
- the mask can be configured as: ffff-ff 00-0000.
- the terminal device The information displayed in the network is only 1234-56, but this MAC address plus mask can indicate that the number of terminals ranges from 1234-5600-0000 to 1234_56ff-ffff; when comparing the same type of terminal equipment in the enterprise
- the mask can be configured as: ffff-fff-0000.
- the information that the terminal device displays on the network is: 1234-5678, the computer can learn more about this from the prefix field of 1234-5678.
- the information of the terminal device makes the allocation in the VLAN more reasonable.
- the corresponding MAC address plus mask can indicate that the range of the number of terminals is small, only 1234-5678-0000 to 1234_5678_ffff.
- the prefix field is extracted by using a configuration mask.
- the prefix field of the preset length may be fixedly extracted by using a preset parameter.
- the extraction rule of the prefix field may also be used. There are other ways, which are not specifically limited here.
- step 204 in this embodiment is the same as that of step 103 in the foregoing embodiment shown in FIG. 1, and details are not described herein again.
- a MAC address plus a mask is used to allocate a VLAN.
- the method for representing a terminal device is very flexible, and the number and accuracy of the control terminal can be determined according to actual needs.
- the VLAN allocating device allocates a good VLAN to all the terminal devices when the device is initialized.
- some terminal devices can configure the VLA label for the sent packet, and some terminal devices cannot The message sent by the VLA tag is configured. Therefore, the present invention also provides a mechanism for allocating a VLAN in real time.
- another embodiment of the method for allocating a virtual local area network according to the present invention includes:
- the VLAN distribution device receives the message sent by the terminal device in the same local area network, and the message represents the service required by the corresponding terminal device.
- the VLAN allocation device determines whether the packet carries a VLAN tag. If the VLAN tag is carried, the step 308 is triggered. If the VLAN tag is not carried, the step 303 is triggered.
- some terminal devices when a packet is sent, some terminal devices can configure a VLAN tag for the sent packet, and some terminal devices cannot configure a VLAN tag for the packet sent by the terminal device.
- the switch device needs to be configured in real time. Add a preset VLAN tag to the VLAN-free packet so that the packet can be forwarded in the corresponding VLAN.
- the VLAN allocating device decapsulates the packet, and obtains the MAC address of the terminal device where the sender is located in the packet. 304. Query a mask corresponding to the MAC address.
- step 304 in this embodiment is the same as that of the step 202 in the foregoing embodiment shown in FIG. 2, and details are not described herein again.
- step 305 in this embodiment is the same as that of the step 203 in the foregoing embodiment shown in FIG. 2, and details are not described herein again.
- the VLAN allocation device queries the mapping relationship between the locally stored prefix field and the VLAN tag.
- a prefix field of a MAC address indicates all terminal devices of the same type. This type of terminal device should be configured with corresponding network resources and transmission priorities. Therefore, packets sent by the terminal device need to have corresponding network resources and transmission priorities. Level intra-VLAN forwarding. Since the process of packet forwarding occurs after the terminal device is initialized, each prefix field and the corresponding VLAN tag are locally stored.
- the VLAN assigning device After the mapping between the prefix field and the corresponding VLAN tag is queried, the VLAN assigning device adds a corresponding VLAN tag to the packet, so that the packet can be forwarded in the corresponding VLAN.
- the VLAN allocation device forwards the packet to the corresponding VLAN according to the VLAN tag on the packet, and performs service processing carried by the packet.
- the VLA distribution device when the VLA distribution device receives the packet, it determines whether the packet carries a VLAN tag, and if not, assigns a VLAN tag to the packet according to the prefix field of the packet, so that the packet is The text can be forwarded in the corresponding VLAN to perform corresponding service processing.
- the prefix field of the present invention can represent a plurality of terminal devices, the amount of stored data is small, so that when the mapping relationship of related VLA tags is performed, Convenient, the speed of message forwarding has been significantly improved.
- VLAN allocation method in the foregoing embodiment is further described in detail in a specific application scenario, which is specifically:
- the VLAN allocating device When all terminal devices located in the same local area network are initialized, the VLAN allocating device first obtains the MAC addresses of all the terminal devices, and analyzes and classifies all the MAC addresses, according to the type, quantity, and distribution of various terminal devices. The factor determines the prefix field of each type of terminal device, and then stores the prefix field locally in the form of a MAC address plus a mask. Assume that all of the above terminal devices can be divided into three categories: computers, IP phones, and digital set-top boxes. The analysis of the types, numbers, and distribution of various terminal devices determines that the prefix fields of computers, IP phones, and digital set-top boxes are 24 bits. , 32-bit and 40-bit.
- 1234-5678_9abc, 1234-56bc-349a, and 1234-5634-9a34 are one of the terminal devices of the computer, IP phone, and digital set-top box, respectively, and their MAC address plus mask forms are: 1234-5678-9abc+ffff_ff 00-0000, 1234-56bc-349a+ffff-fff-0000 and 1234-5634-9a34+fff-fffff-f00.
- a VLAN tag is assigned to each prefix field, and the mapping relationship between each prefix field and the VLAN tag is stored, and the VLAN tag is sent to the corresponding terminal device, so that the terminal device with the capability of adding the VLAN tag is added.
- the VLAN tag corresponding to the terminal device can be added to the packet.
- the VLAN distribution device obtains the packet sent by the terminal device, and determines whether the packet carries the VLAN tag. If yes, the packet is forwarded to the corresponding VLAN according to the VLAN tag of the packet, and the packet is sent to the VLAN.
- the process of assigning a VLAN tag in real time includes: First, decapsulating the packet, obtaining the MAC address of the terminal device where the sender is located in the message is 1234-5678_9abc; and then querying the MAC address of the MAC address 1234-5678_9abc+ The masked data string is 1234-5678_9abc +ffff-ff 00-0000, and the MAC address and the corresponding mask are logically ANDed by the binary number to obtain the prefix field 1234-56. Finally, the locally stored prefix field is queried.
- VLAN tag mapping relationship (1234-56- VLAN1) according to the mapping relation of the packet with the corresponding VLAN tag VLAN1 0
- the VLAN distribution device After the corresponding VLAN tag is added to the packet, the VLAN distribution device forwards the packet to the VLAN 1 according to the VLAN tag of the packet, and performs the service processing of the packet.
- the terminal device of the present invention allocates a VLAN according to the prefix field of the MAC address, the related application of the terminal device does not change, so there is no need to reconfigure the SA. If the enterprise needs to upgrade or update the device, as long as the enterprise still uses the devices produced by the same manufacturer, the prefix field of the MAC address may not change, so the original VLAN configuration does not need to be changed, which reduces the work of the enterprise to maintain the network device. burden.
- An embodiment of the VLA allocation apparatus in the embodiment of the present invention includes:
- the obtaining unit 401 is configured to acquire a media access control MAC address of the terminal device.
- the extracting unit 402 is configured to extract a prefix field in the MAC address according to the preset extraction rule, where the prefix field is a binary field of the first N bits in the MAC address, where N is greater than or equal to 1, and is less than 48;
- the allocating unit 403 is configured to allocate a corresponding VLAN tag to the terminal device according to the prefix field.
- the extracting unit in the embodiment of the present invention may include:
- the first query module 4021 is configured to query a mask corresponding to the MAC address.
- the operation module 4022 is configured to perform a logical AND operation on the MAC address and the mask to obtain a prefix field.
- the second query module 4031 is configured to query a mapping relationship between the prefix field and a VLAN tag.
- the allocating module 4032 is configured to allocate a corresponding VLAN tag to the terminal device according to the mapping relationship.
- the receiving unit 404 is configured to receive the packet sent by the terminal device, and trigger the acquiring unit to obtain the MAC address of the terminal device in the packet.
- the forwarding unit 405 is configured to forward the packet to a VLAN corresponding to the VLAN tag, and perform corresponding service processing.
- the determining unit 406 is configured to determine whether the packet carries a VLAN tag, and if yes, trigger the forwarding unit 405, and if not, trigger the acquiring unit 401.
- the obtaining unit 401 obtains the MAC address of the terminal device, and the MAC address is a globally unique 48-bit (binary) physical address that is burned into the network card by the manufacturer.
- the obtaining process may be performed when the terminal device is initialized, or the receiving unit 404 may first receive the packet sent by the terminal device in the same local area network, and the trigger obtaining unit 401 obtains the terminal device where the sender is located in the packet. MAC address.
- the determining unit 406 in the VLAN allocating device determines whether the received packet carries a VLAN tag, and if so, triggers the forwarding unit 405, and if not, triggers the acquiring unit. 401.
- the extracting unit 402 extracts a prefix field in the MAC address according to a preset extraction rule, where the prefix field is a binary field of the first N bits in the MAC address, and N is greater than or equal to 1, and is less than 48.
- the preset extraction rule may be that the first query module 4021 queries the mask corresponding to the MAC address, and then the operation module 4022 performs a logical AND operation on the MAC address and the corresponding mask to obtain a prefix field.
- a mask matching the prefix field of the MAC address is preset in the VLAN allocating device, that is, if the prefix field is the first N bits of the MAC address, the first N bits of the mask are "1", and the remaining 48 minus N Bit is "0", such as: prefix field For 32 bits (1234-5678-xxxx), the mask is ffff-ff ff_0000.
- the extraction unit 402 of the present invention may also automatically extract the prefix field of the preset length by using a preset parameter. In an actual application, the extraction rule of the prefix field may have other manners, which is not specifically limited herein.
- the second query module 4031 in the allocating unit 403 queries the mapping relationship between the prefix field and the VLAN tag, and the allocating module 4032 allocates a corresponding VLAN tag to the packet sent by the terminal device according to the mapping relationship.
- the forwarding unit 405 forwards the packet to the VLAN corresponding to the VLAN tag, and performs the process. Corresponding business processing.
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CN114513695A (zh) * | 2022-04-19 | 2022-05-17 | 深圳市华曦达科技股份有限公司 | 一种ott行业视频内容跨区域运营的方法与装置 |
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