CN105959430A - Switcher MAC address aging method - Google Patents
Switcher MAC address aging method Download PDFInfo
- Publication number
- CN105959430A CN105959430A CN201610377793.8A CN201610377793A CN105959430A CN 105959430 A CN105959430 A CN 105959430A CN 201610377793 A CN201610377793 A CN 201610377793A CN 105959430 A CN105959430 A CN 105959430A
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- China
- Prior art keywords
- mac address
- list item
- digestion period
- time
- granularity
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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 provides a switcher MAC address aging method, and the method comprises the following steps: S1, configuring the aging period and granularity of an MAC address; S2, taking the source MAC address and VLAN ID of a message as key values, making a Hash index, and judging whether there is already a corresponding item or not; S3, updating the current time as an updated time stamp of a table item if the corresponding table item is in an MAC address list, or else, adding one table item, and updating the current time as the updated time stamp of the table item; S4, scanning the MAC address list in an aging process when the aging period granularity arrives, calculating the time difference between the current time and the updated time stamp, and judging whether the time difference is greater than an aging period or not; S5, repeatedly carrying out the step S4 if the time difference is less than the aging period; S6, deleting the table item if the time difference is greater than the aging period. The method reduces the error of aging time, enables the forwarding behavior of a switcher to be more accurate, and improves the effective utilization rate of the MAC address list.
Description
Technical field
The invention belongs to switch field, be specifically related to a kind of switch mac address aging method.
Background technology
Switch realizes Layer 2 data based on mac address table and forwards, and houses MAC in mac address table
Address, VLAN ID and the mapping relations of port numbers.Switch allows automatically after port receives message
Practise MAC Address, add the source MAC of message, VLAN ID and port numbers to mac address table
In.Due to mac address table limited space, it is impossible to unconfined learned addresses, when therefore introducing aging
Between mechanism.Switch clears up, by the mechanism of ageing time, the table being of little use in mac address table termly
, provide space for new address learning, it is ensured that the normal forwarding of switch.
The most conventional way is to create two processes, an address learning process, a ground in a switch
Location ager process, two processes are relatively independent operations, and its principle is as follows:
Address learning process: switch ports themselves after receiving message, with the source MAC of message and
VLAN ID is that key assignments does Hash index, searches mac address table.If mac address table does not also have
The list item that this MAC Address is corresponding, then carry out address learning, by the source MAC of this message, VLAN ID
Mapping with port numbers adds in mac address table, simultaneously by the hit position 1 of this list item, represents this MAC
Address is active；If mac address table has existed for this MAC Address, the most only update this list item
Hit position, by hit position 1, represent that this MAC Address remains in that active；
Address aging process: ageing time defaults to 300 seconds, it is allowed to the scope of user setup from 10 seconds to
1000000 seconds；Address aging process every a digestion period will run-down mac address table, by it
Middle hit position be 0 list item directly delete；Simultaneously by the list item hit position 0 that hit position is 1, represent and wait to delete
Remove.
Owing to address learning process and address aging process work independently from each other, a therefore MAC Address
Ageing time can there is error, this error is arrange ageing time 1-2 times, concrete error such as Fig. 3
Shown in.Situation shown in Fig. 3 (a) is: list item a just updates, its hit position 1, immediately digestion period
Arrive, its hit position 0, when arriving next digestion period, delete MAC ground corresponding for this list item a
Location, now the ageing time of MAC Address is a digestion period；Situation shown in Fig. 3 (b) is: table
Item a updates at the end of a digestion period is just, its hit position 1, when next digestion period arrives,
Its hit position 0, when another digestion period arrives, deletes MAC Address corresponding to this list item a, now
The ageing time of MAC Address is two digestion periods.Long ageing time can make the MAC in switch
Address table exceeds the time limit, and makes switch make some irrational forwardings and determines, also reduces mac address table simultaneously
Effective rate of utilization.
Summary of the invention
Present invention aims to the deficiencies in the prior art, it is provided that a kind of aging side of switch mac address
Method, this switch mac address aging method can reduce the error of MAC address aging time so that hands over
The forwarding behavior changed planes more accurately, also improve the effective rate of utilization of mac address table.
For reaching above-mentioned requirements, the present invention adopts the technical scheme that a kind of switch mac address of offer is aging
Method, comprises the following steps:
S1, the digestion period of configuration MAC Address and granularity digestion period；
S2, do Hash index with the source MAC of message and VLAN ID for key assignments, search MAC ground
Location table, it may be judged whether there is corresponding list item；
If S3 mac address table has existed corresponding list item, then current time is updated to described list item
Update timestamp；If mac address table does not exist corresponding list item, then add a list item, by current time
It is updated to the renewal timestamp of this list item；
S4, when digestion period granularity arrive time, ager process scanning mac address table, calculate current time with
The time difference of this renewal timestamp, it is judged that whether this time difference is more than digestion period；
If this time difference of S5 is less than digestion period, repeat step S4；
If this time difference of S6 is more than digestion period, then delete this list item.
Compared with prior art, this switch mac address aging method has the advantage that as follows: introduce aging
Cycle granularity and renewal timestamp, current time and renewal timestamp when calculating each granularity arrival digestion period
Difference, judge whether to delete list item, by MAC Address by the size comparing this difference and digestion period
Ageing time error, from 0 second to MAC address aging cycle time, is reduced to from 0 second to MAC Address old
Change cycle granularity time, greatly reduces the error of ageing time so that the forwarding behavior of switch is more
Obtain accurately, also improve the effective rate of utilization of mac address table.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing further understanding of the present application, constitutes the part of the application,
Using identical reference number to represent same or analogous part in the drawings, the application's is schematic
Embodiment and explanation thereof are used for explaining the application, are not intended that the improper restriction to the application.In the accompanying drawings:
Fig. 1 is the flow chart of the application；
Fig. 2 is the schematic diagram of a kind of embodiment of the application；
Fig. 3 is the schematic diagram of prior art.
Detailed description of the invention
For making the purpose of the application, technical scheme and advantage clearer, below in conjunction with accompanying drawing and be embodied as
Example, is described in further detail the application.For the sake of simplicity, this area skill is eliminated in below describing
Art personnel some technical characteristic known.
According to one embodiment of present invention, it is provided that a kind of switch mac address aging method, such as Fig. 1 institute
Show, comprise the following steps:
S1, the configuration digestion period of MAC Address and granularity digestion period, digestion period in the range of
10-1000000s；Digestion period, granularity was the time of MAC address aging process run-down mac address table
Interval, digestion period, granularity was more than or equal to 10s, and less than or equal to digestion period；Digestion period and aging
Cycle granularity is user and can configure, and can determine by arranging software variable or configuration register；
S2, do Hash index with the source MAC of message and VLAN ID for key assignments, search MAC ground
Location table, it may be judged whether there is corresponding list item；
If S3 mac address table has existed corresponding list item, then current time is updated to this list item more
New timestamp；If mac address table does not exist corresponding list item, then add a list item, by current time more
It it is newly the renewal timestamp of this list item；
S4, when digestion period granularity arrive time, ager process scanning mac address table, calculate current time with
The time difference of this renewal timestamp, it is judged that whether this time difference is more than digestion period；
If this time difference of S5 is less than digestion period, repeat step S4；
If this time difference of S6 is more than digestion period, then delete this list item.
Being illustrated according to one embodiment of present invention, arranging ageing time is 300 seconds, aging week
Phase granularity is 75 seconds.
Situation shown in Fig. 2 (a) is to update or after interpolation list item a, and digestion period, granularity arrived for the first time immediately
Coming, concrete operations are as follows:
101: update or add list item a, current time is saved in renewal timestamp；
102: granularity digestion period arrives for the first time, ager process scanning mac address table for the first time, calculate
The time difference of the timestamp preserved in current time and MAC Address list item a, slightly larger than 0 second, not to address
List item a does any operation；
103: granularity digestion period arrives for the second time, ager process second time scanning mac address table, calculate
The time difference of the timestamp preserved in current time and MAC Address list item a, slightly larger than 75 seconds, the most over the ground
Location list item a does any operation；
104: granularity digestion period arrives for the third time, ager process third time scanning mac address table, calculate
The time difference of the timestamp preserved in current time and MAC Address list item a, slightly larger than 150 seconds, the most over the ground
Location list item a does any operation；
105: the four granularity arrivals digestion period, the 4th scanning mac address table of ager process, calculate
The time difference of the timestamp preserved in current time and MAC Address list item a, slightly larger than 225 seconds, the most over the ground
Location list item a does any operation；
106: the five granularity arrivals digestion period, the 5th scanning mac address table of ager process, calculate
The time difference of the timestamp preserved in current time and MAC Address list item a, slightly larger than 300 seconds, more than old
The change cycle, deleting MAC address list item a.
From above mode of operation, in the case of 2 (a) Suo Shi, during MAC Address list item a aging
Between be a digestion period, ageing time error is 0 second.
Situation shown in Fig. 2 (b) is after a digestion period, granularity terminated, and updates immediately or adds list item a,
Concrete operations are as follows:
201: update or add list item a, current time is saved in timestamp；
202: granularity digestion period arrives for the first time, ager process scanning mac address table for the first time, calculate
The time difference of timestamp preserved in current time and MAC Address list item a, is slightly less than 75 seconds, the most over the ground
Location list item a does any operation；
203: granularity digestion period arrives for the second time, ager process second time scanning mac address table, calculate
The time difference of timestamp preserved in current time and MAC Address list item a, is slightly less than 150 seconds, the most over the ground
Location list item a does any operation；
204: granularity digestion period arrives for the third time, ager process third time scanning mac address table, calculate
The time difference of timestamp preserved in current time and MAC Address list item a, is slightly less than 225 seconds, the most over the ground
Location list item a does any operation；
205: the four granularity arrivals digestion period, the 4th scanning mac address table of ager process, calculate
The time difference of timestamp preserved in current time and MAC Address list item a, is slightly less than 300 seconds, the most over the ground
Location list item a does any operation；
206: the five granularity arrivals digestion period, the 5th scanning mac address table of ager process, calculate
The time difference of the timestamp preserved in current time and MAC Address list item a, is slightly less than 375 seconds, more than old
The change cycle, deleting MAC address list item a；
From above mode of operation, in the case of 2 (b) Suo Shi, during MAC Address list item a aging
Between be add a digestion period one digestion period granularity, ageing time error be one digestion period granularity.
Therefore, after using the ageing time mechanism optimized in the present invention, ageing time scope is 300 seconds-375
Second, error is the 0-75 second, and the ageing time scope of conventional MAC address aging mechanism is 300 seconds-600
Second, ageing time error is the 0-300 second, and the present invention greatly reduces the error of ageing time so that exchange
The forwarding behavior of machine more accurately, also improve the effective rate of utilization of mac address table.
For convergence-level, core layer switch, need the data volume forwarded relatively big inside switch, relate to
And the mac address table item enormous amount arrived.The present invention is when practice, in order to ensure performance, can adopt
Automatically learn with hardware based MAC Address and aging method.It is embodied as to the present invention to mention
The method logic of MAC address aging, is integrated in exchange chip, realizes related algorithm by hardware and patrols
Volume, provide related register to configure the parameter such as ageing time, granularity digestion period for user simultaneously.
For access-layer switch, inside switch, need data volume relatively convergence-level, the core layer forwarded
For switch less, the mac address table item quantity related to is relatively fewer.The present invention when practice,
In order to consider hardware cost and increase functional mobility, MAC Address based on software can be used automatically to learn
And aging way.It is embodied as being the messages transmitted to CPU that receives of exchange chip, CPU message is carried out
Resolve, and MAC Address is carried out study with aging.The MAC Address so can will mentioned in the present invention
Automatically study and aging way, be integrated in software, realize related algorithm and logic by software, with
Time be also required to provide the user ageing time, the isoparametric configuration of granularity digestion period.
Embodiment described above only represents the several embodiments of the present invention, and it describes more concrete and detailed,
But limitation of the scope of the invention can not be interpreted as.It should be pointed out that, for the ordinary skill of this area
For personnel, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement, these
Broadly fall into scope.Therefore protection scope of the present invention should be as the criterion with described claim.
Claims (3)
1. switch mac address aging method, it is characterised in that comprise the following steps:
S1, the digestion period of configuration MAC Address and granularity digestion period；
S2, do Hash index with the source MAC of message and VLAN ID for key assignments, search MAC ground
Location table, it may be judged whether there is corresponding list item；
If S3 mac address table has existed corresponding list item, then current time is updated to described list item
Update timestamp；If mac address table does not exist corresponding list item, then add a list item, will be current
Time is updated to the renewal timestamp of described list item；
S4, when digestion period granularity arrive time, ager process scanning mac address table, calculate current time with
The time difference of described renewal timestamp, it is judged that whether described time difference is more than digestion period；
If the described time difference of S5 is less than digestion period, repeat step S4；
If the described time difference of S6 is more than digestion period, then delete described list item.
Switch mac address aging method the most according to claim 1, it is characterised in that described
Digestion period is in the range of 10-1000000s.
Switch mac address aging method the most according to claim 2, it is characterised in that described
Digestion period, granularity was more than or equal to 10s, and less than or equal to digestion period.
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| CN201610377793.8A CN105959430A (en) | 2016-05-31 | 2016-05-31 | Switcher MAC address aging method |
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Cited By (10)
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| CN106411622A (en) * | 2016-12-16 | 2017-02-15 | 成都西加云杉科技有限公司 | Table entry processing method and device |
| CN107872391A (en) * | 2017-11-23 | 2018-04-03 | 锐捷网络股份有限公司 | A kind of entry updating method and device |
| CN108173784A (en) * | 2017-12-29 | 2018-06-15 | 湖南恒茂高科股份有限公司 | A kind of aging method and device of the data pack buffer of interchanger |
| CN108347494A (en) * | 2017-01-25 | 2018-07-31 | 中兴通讯股份有限公司 | MAC address aging processing method, network processor chip and communication equipment |
| CN108616614A (en) * | 2018-04-28 | 2018-10-02 | 深圳市风云实业有限公司 | MAC Address management method, device and electronic equipment |
| CN109451087A (en) * | 2018-10-26 | 2019-03-08 | 新华三技术有限公司 | MAC address entries ageing method and device |
| CN111147624A (en) * | 2019-12-31 | 2020-05-12 | 苏州浪潮智能科技有限公司 | MAC (media Access control) table entry aging time adjusting method and device |
| CN112838993A (en) * | 2019-11-22 | 2021-05-25 | 武汉神州数码云科网络技术有限公司 | Method for realizing dynamic issuing of MAC VLAN |
| CN113542130A (en) * | 2021-07-22 | 2021-10-22 | 新华三信息安全技术有限公司 | Method and device for processing address table items |
| CN114024919A (en) * | 2021-09-28 | 2022-02-08 | 苏州裕太微电子有限公司 | Method and system for realizing accurate aging of Ethernet two-layer forwarding table |
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| CN106411622A (en) * | 2016-12-16 | 2017-02-15 | 成都西加云杉科技有限公司 | Table entry processing method and device |
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| CN108347494A (en) * | 2017-01-25 | 2018-07-31 | 中兴通讯股份有限公司 | MAC address aging processing method, network processor chip and communication equipment |
| CN108347494B (en) * | 2017-01-25 | 2022-03-11 | 中兴通讯股份有限公司 | MAC address aging processing method, network processor chip and communication equipment |
| CN107872391A (en) * | 2017-11-23 | 2018-04-03 | 锐捷网络股份有限公司 | A kind of entry updating method and device |
| CN107872391B (en) * | 2017-11-23 | 2021-06-18 | 锐捷网络股份有限公司 | Table entry updating method and device |
| CN108173784A (en) * | 2017-12-29 | 2018-06-15 | 湖南恒茂高科股份有限公司 | A kind of aging method and device of the data pack buffer of interchanger |
| CN108616614A (en) * | 2018-04-28 | 2018-10-02 | 深圳市风云实业有限公司 | MAC Address management method, device and electronic equipment |
| CN108616614B (en) * | 2018-04-28 | 2021-04-06 | 深圳市风云实业有限公司 | MAC address management method and device and electronic equipment |
| CN109451087A (en) * | 2018-10-26 | 2019-03-08 | 新华三技术有限公司 | MAC address entries ageing method and device |
| CN112838993A (en) * | 2019-11-22 | 2021-05-25 | 武汉神州数码云科网络技术有限公司 | Method for realizing dynamic issuing of MAC VLAN |
| CN111147624A (en) * | 2019-12-31 | 2020-05-12 | 苏州浪潮智能科技有限公司 | MAC (media Access control) table entry aging time adjusting method and device |
| CN111147624B (en) * | 2019-12-31 | 2022-12-13 | 苏州浪潮智能科技有限公司 | MAC (media Access control) table entry aging time adjusting method and device |
| CN113542130A (en) * | 2021-07-22 | 2021-10-22 | 新华三信息安全技术有限公司 | Method and device for processing address table items |
| CN114024919A (en) * | 2021-09-28 | 2022-02-08 | 苏州裕太微电子有限公司 | Method and system for realizing accurate aging of Ethernet two-layer forwarding table |
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Application publication date: 20160921 |