CN111343089B - Method and system for solving flooding problem caused by MAC address HASH conflict - Google Patents
Method and system for solving flooding problem caused by MAC address HASH conflict Download PDFInfo
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- CN111343089B CN111343089B CN202010096993.2A CN202010096993A CN111343089B CN 111343089 B CN111343089 B CN 111343089B CN 202010096993 A CN202010096993 A CN 202010096993A CN 111343089 B CN111343089 B CN 111343089B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/54—Organization of routing tables
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/32—Flooding
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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
- H04L61/5046—Resolving address allocation conflicts; Testing of addresses
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- 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
Abstract
The invention discloses a method and a system for solving the flooding problem caused by MAC address HASH conflict, relating to the technical field of exchange and forwarding, wherein when the MAC address HASH conflict occurs, conflict information is written into an ACL (access control list) table item carried by a switching chip, and a source port for receiving a message in the conflict information is used as a redirection port of the ACL table item, so that an MAC address forwarding table is simulated; and initiates a timer for use as an aging-related operation for the MAC address recorded by the ACL entry. The invention uses the ACL table items of the exchange chip per se without using the external expansion TCAM table, and only uses one ACL table item to solve one address conflict, thereby having low cost; only the conflict address is provided with the table item, and the timer is started for aging at regular time, so that the counting of an extra ACL table is not needed, the occupied CPU resource is less, and the ACL reuse rate is improved; hardware resources are still adopted for corresponding forwarding, so that the line speed forwarding is completely achieved, and the forwarding performance is excellent.
Description
Technical Field
The invention relates to the technical field of exchange and forwarding, in particular to a method and a system for solving the flooding problem caused by MAC address HASH conflict.
Background
MAC address learning forwarding is the core, and most basic, function of all switching type devices. If the MAC address learning conflicts, the network bandwidth is directly wasted, even the normal interaction of the services is influenced, and the problem of packet loss or flooding caused by the MAC address conflict is greatly necessary to solve.
The essence of MAC address learning conflict is caused by insufficient hardware resources of the exchange chip, when HASH calculated values are the same and corresponding hardware block entries are full, HASH conflict occurs, the MAC address cannot be learned, and subsequent messages taking the MAC as a destination address are flooded to influence the network.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method and a system for solving the flooding problem caused by MAC address HASH conflict, which have low cost and occupy less CPU resources.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: a method for solving the flooding problem caused by MAC address HASH conflict comprises the following steps:
when the MAC address HASH conflicts, the forwarding chip reports conflict information;
creating an ACL entry in an ACL entry of a forwarding chip, writing conflict information into the newly created ACL entry, and establishing redirection mapping;
periodic attempts write ACL entries to the original MAC address forwarding table until successful.
On the basis of the above scheme, the conflict information includes a message source MAC address, VLAN information, and a source port number for receiving a message.
On the basis of the above scheme, an ACL entry is created in an ACL entry of a forwarding chip, conflict information is written into the newly created ACL entry, and a redirection mapping is established, which specifically includes the following steps:
and taking the message source MAC address and the VLAN information as key values of the ACL entries, setting the actions of the ACL entries as redirection, and setting a redirected destination port as a source port for receiving the message in the conflict information.
On the basis of the scheme, periodically trying to write the ACL entry into the original MAC address forwarding table until success, and specifically comprising the following steps:
after the ACL entries are successfully set, a periodic timer is established for the ACL entries by taking MAC + VLAN as an index;
when the periodic timer corresponding to the ACL entry expires, trying to write the content of the ACL entry into an original MAC address forwarding table, if the content is successfully written, deleting the corresponding ACL entry, and otherwise, entering the next period.
On the basis of the above scheme, the attempting to write the content of the ACL entry into the original MAC address forwarding table specifically includes the following steps:
and writing the MAC + VLAN of the ACL entry into an original MAC address forwarding table in a dynamic attribute mode.
The invention also provides a system for solving the flooding problem caused by the MAC address HASH conflict, which comprises the following steps:
a forwarding chip to: when the MAC address HASH conflicts occur, reporting conflict information to a conflict processing module;
a conflict handling module to: creating an ACL entry in an ACL entry of a forwarding chip, writing conflict information into the newly created ACL entry, and establishing redirection mapping; periodic attempts write ACL entries to the original MAC address forwarding table until successful.
On the basis of the above scheme, the conflict information includes a message source MAC address, VLAN information, and a source port number for receiving a message.
On the basis of the above scheme, the conflict processing module creates an ACL entry in an ACL entry of the forwarding chip, writes conflict information into the newly created ACL entry, and establishes a redirection mapping, specifically including the following steps:
and taking the message source MAC address and the VLAN information as key values of the ACL entries, setting the actions of the ACL entries as redirection, and setting a redirected destination port as a source port for receiving the message in the conflict information.
On the basis of the above scheme, the conflict processing module periodically attempts to write the ACL entry into the original MAC address forwarding table until the ACL entry is successful, and specifically includes the following steps:
after the ACL entries are successfully set, a periodic timer is established for the ACL entries by taking MAC + VLAN as an index;
when the periodic timer corresponding to the ACL entry expires, trying to write the content of the ACL entry into an original MAC address forwarding table, if the content is successfully written, deleting the corresponding ACL entry, and otherwise, entering the next period.
On the basis of the above scheme, the conflict processing module attempts to write the content of the ACL entry into the original MAC address forwarding table, specifically including the following steps:
and writing the MAC + VLAN of the ACL entry into an original MAC address forwarding table in a dynamic attribute mode.
Compared with the prior art, the invention has the advantages that:
when the MAC address HASH conflicts, conflict information is written into an ACL table item carried by a switching chip, and a source port for receiving a message in the conflict information is used as a redirection port of the ACL table item, so that an MAC address forwarding table is simulated; and initiates a timer for use as an aging-related operation for the MAC address recorded by the ACL entry. The invention uses the ACL table items of the exchange chip per se without using the external expansion TCAM table, and only uses one ACL table item to solve one address conflict, thereby having low cost; only the conflict address is provided with the table item, and the timer is started for aging at regular time, so that the counting of an extra ACL table is not needed, the occupied CPU resource is less, and the ACL reuse rate is improved; hardware resources are still adopted for corresponding forwarding, so that the line speed forwarding is completely achieved, and the forwarding performance is excellent.
Drawings
Fig. 1 is a schematic diagram illustrating an operation principle of a method for solving a flooding problem caused by a MAC address HASH collision according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a method for solving a flooding problem caused by a MAC address HASH collision according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The embodiment of the invention provides a method for solving the flooding problem caused by MAC address HASH conflict, which comprises the following steps:
when the MAC address HASH conflicts, the forwarding chip reports conflict information;
creating an ACL entry in an ACL entry of a forwarding chip, writing conflict information into the newly created ACL entry, and establishing redirection mapping;
periodic attempts write ACL entries to the original MAC address forwarding table until successful.
When the forwarding chip receives the message source MAC address and the VLAN message matched with the ACL entry, the forwarding chip redirects the message to a source port for receiving the message in the conflict information corresponding to the ACL entry.
In a preferred embodiment, the collision information includes a message source MAC address, VLAN information, and a source port number of a received message.
As a preferred embodiment, an ACL entry is created in an ACL entry of a forwarding chip, conflict information is written into the newly created ACL entry, and a redirection mapping is established, which specifically includes the following steps:
and taking the message source MAC address and the VLAN information as key values of the ACL entries, setting the actions of the ACL entries as redirection, and setting a redirected destination port as a source port for receiving the message in the conflict information.
As a preferred embodiment, periodically attempting to write an ACL entry into an original MAC address forwarding table until successful, specifically includes the following steps:
after the ACL entries are successfully set, a periodic timer is established for the ACL entries by taking MAC + VLAN as an index;
when the periodic timer corresponding to the ACL entry expires, trying to write the content of the ACL entry into an original MAC address forwarding table, if the content is successfully written, deleting the corresponding ACL entry, and otherwise, entering the next period.
As a preferred embodiment, the attempting to write the content of the ACL entry into the original MAC address forwarding table specifically includes the following steps:
and writing the MAC + VLAN of the ACL entry into an original MAC address forwarding table in a dynamic attribute mode. The dynamic attributes here refer to: the information written into the address table by the MAC + VLAN has aging time, cannot always exist in the address table, but needs to be updated and stored in the table entry for a long time by address learning, namely, a dynamic address, but not a static address.
As shown in fig. 1, when a packet enters the switch chip port1, a HASH collision occurs if HASH block is calculated to be full for the original MAC address forwarding table (Hw MAC table in fig. 1) by the MAC address and VLAN number of the packet. At this time, the chip reports the conflict information to the CPU, the CPU sets the conflict information to an ACL entry (Hw ACL table in fig. 1) of the chip, establishes an ACL entry and a lifting and directing mapping, and thus simulates an MAC address forwarding table, and also establishes a periodic timer for the address table, which is used for aging-related operations of the MAC address recorded by the ACL entry. The software timer information for the MAC address of the HASH collision is stored in the Sw MAC table of FIG. 1.
Wherein, the Hw mac table in FIG. 1 functions as: the table is a hardware MAC address learning table item carried by the exchange chip itself and used for learning MAC addresses and providing address searching matching. Namely the original MAC address forwarding table.
The Sw mac table functions as: this table is used to store software timer information for the MAC address of a HASH collision in the Hw MAC table.
The Hw acl table functions as: the table is an ACL TCAM table carried by the chip and is used for storing MAC information of HASH conflict in the Hw MAC table and setting action as redirection to a corresponding port.
Referring to fig. 2, a method for solving a flooding problem caused by a MAC address HASH collision according to an embodiment of the present invention specifically includes the following steps:
101. judging whether the MAC address HASH conflict exists in the original MAC address forwarding table, and if so, entering step 102; if not, continuing to wait;
102. reporting to inform a CPU by adopting chip interrupt, and informing a conflict processing module by a CPU interrupt processing release signal;
103. the conflict processing module records conflict information, such as message source MAC address, VLAN information and source port number of a received message;
104. the conflict processing module creates an ACL entry for the conflict information through an ACL interface, namely in an Hw ACL table, a message source MAC and a VLAN are used as key values of the ACL entry, the action is set to be redirected, and a redirected destination port is set as a source port for receiving the message in the conflict information;
105. after the ACL entries are successfully set, the conflict processing module establishes a periodic timer in a mode of MAC + VLAN according to the conflict information, and the period of the timer is 2 times of the aging time of the current chip; storing software timer information for the MAC address of the HASH collision in the Sw MAC table of FIG. 1;
106. the Timer periodically tries to write the content of the ACL entry into an original MAC address forwarding table in a mode of MAC + VLAN and dynamic attributes;
107. judging whether the writing is successful, if so, entering step 107; if not, returning to the step 106 to wait for the next period;
108. the corresponding ACL entry is deleted.
The embodiment of the present invention further provides a system for solving a flooding problem caused by a MAC address HASH collision, including:
a forwarding chip to: when the MAC address HASH conflicts occur, the CPU is informed by adopting chip interrupt reporting, and the CPU interrupts the processing and releasing signal to inform the conflict processing module;
a conflict handling module to: creating an ACL entry in an ACL entry of a forwarding chip, writing conflict information into the newly created ACL entry, and establishing redirection mapping; periodic attempts write ACL entries to the original MAC address forwarding table until successful.
In a preferred embodiment, the collision information includes a message source MAC address, VLAN information, and a source port number of a received message.
As a preferred embodiment, the conflict processing module creates an ACL entry in an ACL entry of a forwarding chip, writes conflict information into the newly created ACL entry, and establishes a redirection mapping, specifically including the following steps:
and taking the message source MAC address and the VLAN information as key values of the ACL entries, setting the actions of the ACL entries as redirection, and setting a redirected destination port as a source port for receiving the message in the conflict information.
As a preferred embodiment, the periodically attempting, by the conflict processing module, to write the ACL entry into the original MAC address forwarding table until the ACL entry is successful specifically includes the following steps:
after the ACL entries are successfully set, a periodic timer is established for the ACL entries by taking MAC + VLAN as an index;
when the periodic timer corresponding to the ACL entry expires, trying to write the content of the ACL entry into an original MAC address forwarding table, if the content is successfully written, deleting the corresponding ACL entry, and otherwise, entering the next period.
As a preferred embodiment, the method for attempting to write the content of the ACL entry into the original MAC address forwarding table by the conflict processing module specifically includes the following steps:
and writing the MAC + VLAN of the ACL entry into an original MAC address forwarding table in a dynamic attribute mode.
Based on the same inventive concept, embodiments of the present application provide a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements all or part of method steps of a method for solving a flooding problem caused by a MAC address HASH collision.
All or part of the flow of the method for solving the flooding problem caused by the MAC address HASH collision can be realized by instructing related hardware through a computer program, the computer program can be stored in a computer-readable storage medium, and the steps of the method embodiments can be realized when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U-disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), random-access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, in accordance with legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunications signals.
Based on the same inventive concept, an embodiment of the present application further provides an electronic device, which includes a memory and a processor, where the memory stores a computer program running on the processor, and the processor executes the computer program to implement all or part of method steps in a method for solving a flooding problem caused by a MAC address HASH collision.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable gate array (FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware component, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, the processor being the control center of the computer device and the various interfaces and lines connecting the various parts of the overall computer device.
The memory may be used to store computer programs and/or modules, and the processor may implement various functions of the computer device by executing or executing the computer programs and/or modules stored in the memory, as well as by invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, video data, etc.) created according to the use of the cellular phone, etc. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, server, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), servers and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A method for solving the flooding problem caused by MAC address HASH collision is characterized by comprising the following steps:
when the MAC address HASH conflicts, the forwarding chip reports conflict information;
creating an ACL entry in an ACL entry carried by a forwarding chip, writing conflict information into the newly created ACL entry, and establishing redirection mapping;
periodically trying to write the ACL entries into the original MAC address forwarding table until success;
periodically attempting to write the ACL entries into the original MAC address forwarding table until success, specifically comprising the following steps:
after the ACL entries are successfully set, a periodic timer is established for the ACL entries by taking MAC + VLAN as an index;
when the periodic timer corresponding to the ACL entry expires, trying to write the content of the ACL entry into an original MAC address forwarding table, if the content is successfully written, deleting the corresponding ACL entry, and otherwise, entering the next period.
2. The method of claim 1, wherein the collision information comprises a message source MAC address and VLAN information and a source port number of a received message.
3. The method of claim 1, wherein creating an ACL entry in an ACL entry of a forwarding chip, writing conflict information into the newly created ACL entry, and establishing a redirection map comprises the steps of:
and taking the message source MAC address and the VLAN information as key values of the ACL entries, setting the actions of the ACL entries as redirection, and setting a redirected destination port as a source port for receiving the message in the conflict information.
4. The method of claim 1, wherein attempting to write the contents of the ACL entry to an original MAC address forwarding table comprises:
and writing the MAC + VLAN of the ACL entry into an original MAC address forwarding table in a dynamic attribute mode.
5. A system for solving a flooding problem caused by a MAC address HASH collision, comprising:
a forwarding chip to: when the MAC address HASH conflicts occur, reporting conflict information to a conflict processing module;
a conflict handling module to: creating an ACL entry in an ACL entry carried by a forwarding chip, writing conflict information into the newly created ACL entry, and establishing redirection mapping; periodically trying to write the ACL entries into the original MAC address forwarding table until success;
the conflict processing module periodically attempts to write the ACL entry into the original MAC address forwarding table until success, specifically comprising the following steps:
after the ACL entries are successfully set, a periodic timer is established for the ACL entries by taking MAC + VLAN as an index;
when the periodic timer corresponding to the ACL entry expires, trying to write the content of the ACL entry into an original MAC address forwarding table, if the content is successfully written, deleting the corresponding ACL entry, and otherwise, entering the next period.
6. The system of claim 5, wherein the collision information includes a message source MAC address and VLAN information and a source port number of a received message.
7. The system of claim 5, wherein the conflict processing module creates an ACL entry in an ACL entry of the forwarding chip, writes the conflict information into the newly created ACL entry, and establishes the redirection mapping, specifically comprising the steps of:
and taking the message source MAC address and the VLAN information as key values of the ACL entries, setting the actions of the ACL entries as redirection, and setting a redirected destination port as a source port for receiving the message in the conflict information.
8. The system of claim 5, wherein the conflict handling module attempts to write the contents of the ACL entry to an original MAC address forwarding table, comprising the steps of:
and writing the MAC + VLAN of the ACL entry into an original MAC address forwarding table in a dynamic attribute mode.
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| CN113381937B (en) * | 2021-06-09 | 2022-09-13 | 烽火通信科技股份有限公司 | Information state reporting method and network equipment |
| CN115118662A (en) * | 2022-06-16 | 2022-09-27 | 浪潮思科网络科技有限公司 | Hash collision processing method, system, equipment and medium based on ARP table |
| CN114884878A (en) * | 2022-07-12 | 2022-08-09 | 常州楠菲微电子有限公司 | MAC address synchronization method for multi-switch chip stacking in hardware learning mode |
| CN115665066A (en) * | 2022-10-25 | 2023-01-31 | 浪潮思科网络科技有限公司 | Method, equipment and medium for expanding MAC address table capacity |
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| CN101232444B (en) * | 2008-01-22 | 2012-03-21 | 杭州华三通信技术有限公司 | Apparatus and method for solving hash collision and exchange equipment with the same |
| CN101431472B (en) * | 2008-12-15 | 2011-05-25 | 中兴通讯股份有限公司 | Processing method and apparatus for media access control clauses |
| CN102843440B (en) * | 2011-06-24 | 2017-04-26 | 中兴通讯股份有限公司 | Method of preventing media access control address drifting and network processing device |
| CN103731355B (en) * | 2013-12-31 | 2017-01-25 | 迈普通信技术股份有限公司 | Method and system for avoiding Hash collision during MAC address learning |
| CN107770076B (en) * | 2016-08-23 | 2020-12-04 | 中兴通讯股份有限公司 | Hash collision processing method and device and switching equipment |
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