CN106130822B - Uniformly send the method and system of CCM message - Google Patents
Uniformly send the method and system of CCM message Download PDFInfo
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- CN106130822B CN106130822B CN201610564550.5A CN201610564550A CN106130822B CN 106130822 B CN106130822 B CN 106130822B CN 201610564550 A CN201610564550 A CN 201610564550A CN 106130822 B CN106130822 B CN 106130822B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
- H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
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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
- H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
Abstract
The present invention provides a kind of method and system for uniformly sending CCM message, obtain initial MEP, record period timer current time, obtain the time point that initial MEP last time sends CCM message, judge whether initial MEP has arrived at the timing node for sending message, when reaching, CCM message is assembled and sent, judges whether initial MEP is the last one MEP, when not being, after waiting predetermined time delay, obtain next MEP, when for when, wait the default final delay time, when current time is aligned with default minimum MEP sending cycle, initial MEP is reacquired.In whole process, in conjunction with the setting of waiting pre-set delay and the setting of default final delay, it is ensured that in the corresponding default minimum MEP sending cycle of initial MEP, all MEP are uniformly sent out BFD message and MEP sending cycle is continuous.
Description
Technical field
The present invention relates to network communication technology fields, send CCM (Continuity Check more particularly to uniform
Message, continuity check message) message method and system.
Background technique
Ethernet technology has been obtained commonly used with advantages such as its good economy, intercommunity and ease for use.Operation
Grade Ethernet becomes the important research field of current web technology, and Carrier Ethernet must provide good service management, event
Hinder the functions such as detection, performance monitoring, and the core of this function is OAM (Operation Administration and
Maintenance, operation management maintainance).
In recent years, with the development of MPLS (Multi-Protocol Label Switch, multiprotocol label switching) technology
Maturation, and it is widely applied to transmission network field, PTN (Packet Transport Network, Packet Transport Network) technology is opened
Beginning is used by more and more operators.IETF (appoint by Internet Engineering Task Force, Internet Engineering
Business group) original MPLS technology is extended on the basis of T-MPLS as current MPLS-TP standard agreement race, OAM also becomes
The core content of MPLS-TP.
When there are a large amount of MEP in same equipment (Maintenance association End Point safeguards endpoint)
When, how equipment uniformly sends CCM message, and the emergency case for reducing network flow is to perplex the difficulty of technical staff
Topic.
Summary of the invention
Based on this, it is necessary to aiming at the problem that there is no a kind of method for effectively uniformly sending CCM message at present, provide one kind
Effectively uniformly send the method and system of CCM message.
A kind of uniform method for sending CCM message, comprising steps of
Obtain initial MEP, the current time of record period timer;
Obtain the time point that initial MEP last time sends CCM message;
According to cycle timer current time, the time point of initial MEP last time transmission CCM message and initial MEP
Corresponding default minimum MEP sending cycle judges whether to reach the timing node that initial MEP sends CCM message;
When reaching, assembles and send CCM message;
Judge whether initial MEP is the last one MEP;
When initial MEP is not the last one MEP, after waiting predetermined time delay, next MEP is obtained;
When initial MEP is the last one MEP, the default final delay time is waited, when current time and default minimum MEP
When sending cycle is aligned, the step of obtaining initial MEP is returned.
A kind of uniform system for sending CCM message, comprising:
Logging modle, for obtaining initial MEP, the current time of record period timer;
Time point obtains module, and the time point of CCM message is sent for obtaining initial MEP last time;
First judgment module, for sending CCM message according to cycle timer current time, initial MEP last time
Time point and the corresponding default minimum MEP sending cycle of initial MEP, judge whether to reach initial MEP send CCM message when
Intermediate node;
Sending module is assembled, for assembling and sending CCM message when reaching;
Second judgment module, for judging whether initial MEP is the last one MEP;
First processing module, for when initial MEP is not the last one MEP, after waiting predetermined time delay, under acquisition
One MEP;
Second processing module, for the default final delay time being waited, when current when initial MEP is the last one MEP
When time is aligned with default minimum MEP sending cycle, and controls logging modle and reacquire initial MEP.
The present invention uniformly sends the method and system of CCM message, obtains initial MEP, record period timer current time,
The time point that initial MEP last time sends CCM message is obtained, judges whether initial MEP has arrived at the time for sending message
Node assembles and sends CCM message when reaching, judge whether initial MEP is the last one MEP, when not being, waits pre-
If after delay time, obtaining next MEP, when for when, the default final delay time is waited, when current time and default minimum MEP
When sending cycle is aligned, initial MEP is reacquired.In whole process, in conjunction with the setting of waiting pre-set delay and default final delay
Setting, it is ensured that in the corresponding default minimum MEP sending cycle of initial MEP, all MEP be uniformly sent out BFD message and
MEP sending cycle is continuous.
Detailed description of the invention
Fig. 1 is the flow diagram of method one embodiment that the present invention uniformly sends CCM message;
Fig. 2 is the flow diagram for second embodiment of method that the present invention uniformly sends CCM message;
Fig. 3 is the structural schematic diagram of system one embodiment that the present invention uniformly sends CCM message;
Fig. 4 is the structural schematic diagram for second embodiment of system that the present invention uniformly sends CCM message.
Specific embodiment
As shown in Figure 1, a kind of method for uniformly sending CCM message, comprising steps of
S100: initial MEP, record period timer current time are obtained.
Any one MEP can be used as initial MEP, it is assumed that has 1-10 MEP, a MEP can be randomly selected as just
Beginning MEP, such as it is initial MEP etc. that can choose No. 1 MEP, which be initial MEP or No. 8 MEP,.In general, also for the ease of record
It is to select the first MEP as initial MEP, specifically, MEP scan pointer can be directed toward first MEP to obtain first
MEP.While obtaining initial MEP, cycle timer current time in equipment at this time is recorded.It is non-essential, cycle timer
It is the timer of unit for microsecond, more specifically, cycle timer is the multistage cycle timer as unit of 1 microsecond,
Herein, multistage can be 7 grades.
S200: the time point that initial MEP last time sends CCM message is obtained.
The time point that initial MEP last time sends CCM message can be obtained by analyzing some historical datas, such as
It can be obtained by parsing initial MEP configuration.MEP is configured to some basic configuration ginsengs of MEP in recording equipment (computer)
Number, in general, in actual operation, this partial data is that specific protocol or industry standard automatic collection, note are based on by equipment
Record is formed.Specifically, record period timer current time and the initial MEP last time of acquisition send the time of CCM message
Point can be recorded using the snap shot of shooting cycle timer bitmap, and the position of cycle timer can be obtained after shooting
Figure snapshot.
S300: according to cycle timer current time, initial MEP last time send CCM message time point and just
The corresponding default minimum MEP sending cycle of beginning MEP judges whether to reach the timing node that initial MEP sends CCM message.
The smallest sending cycle of MEP (minPeroid) be it is preset, specifically, setting MEP minimum send
Period is the advanced situation for needing to consider cycle timer, i.e., MEP minimum sending cycle need to be less than or equal to cycle timer and send out
Raw advanced duration.
S400: it when reaching, assembles and sends CCM message.
When having arrived at the timing node for sending message, assembles and send CCM message.When not up to sending message
When intermediate node, continue waiting for.
S500: judge whether initial MEP is the last one MEP.
S600: when initial MEP is not the last one MEP, after waiting predetermined time delay, next MEP is obtained.
Specifically, if not the last one MEP, pause predetermined time delay (perDelay) refers to MEP after the time
Needle is directed toward next MEP, and repeat the above steps S100 to step S600.Predetermined time delay be it is preset, can be with base
It calculates and obtains in the needs of actual application environment, it is non-essential, need to obtain initial MEP pairs before calculating predetermined time delay
The default minimum MEP sending cycle domestic demand answered sends MEP quantity (MEP_num), and the corresponding default minimum MEP of initial MEP is sent out
The period is sent to obtain predetermined time delay divided by MEP quantity.Specific formula for calculation is perDelay=minPeroid/ MEP_
num.It is arranged using perDelay, guarantees that all MEP are uniformly sent out BFD message, avoid bursts of traffic to the network equipment
Impact.
S700: when initial MEP is the last one MEP, the default final delay time is waited, when current time and is preset most
When small MEP sending cycle is aligned, the step of obtaining initial MEP is returned.
Specifically, if initial MEP has been the last one MEP, when final delay (finalDelay) is preset in pause
Between, whether real-time judge current time is aligned with default minimum MEP sending cycle, when current time and default minimum MEP are sent
When period is aligned, reinitializing MEP pointer is the initial MEP (the first MEP) selected in step S100, i.e. return step
The step of initial MEP is obtained in S100;When current time and default minimum MEP sending cycle are misaligned, continue waiting for.It is default
The final delay time be it is preset, can based on the needs of actual application environment calculate obtain, it is non-essential, calculating
It needs to obtain the corresponding default minimum MEP sending cycle domestic demand of initial MEP before the final delay time and sends MEP quantity, it will be first
The corresponding default minimum MEP sending cycle of beginning MEP sends MEP divided by the corresponding default minimum MEP sending cycle domestic demand of initial MEP
Quantity and remainder calculate default final delay.Specific formula for calculation is finalDelay=minPeriod%MEP_num.
The method that the present invention uniformly sends CCM message, obtains initial MEP, and record period timer current time obtains just
Beginning MEP last time sends the time point of CCM message, judges whether initial MEP has arrived at the timing node for sending message, when
When arrival, CCM message is assembled and sent, judges whether initial MEP is the last one MEP, when not being, waits pre-set delay
After time, obtain next MEP, when for when, wait the default final delay time, when current time and default minimum MEP send it is all
When phase is aligned, initial MEP is reacquired.In whole process, in conjunction with pre-set delay setting and the setting of default final delay is waited, really
It protects in the corresponding default minimum MEP sending cycle of initial MEP, all MEP are uniformly sent out BFD message and MEP is sent
Period is continuous.
As shown in Fig. 2, step S300 includes: in one of the embodiments,
S320: calculating cycle timer current time and initial MEP last time were sent between the time point of CCM message
Difference;
S340: comparing difference default minimum MEP sending cycle corresponding with initial MEP, judges whether to reach initial MEP hair
Send the timing node of CCM message.
When difference default minimum MEP sending cycle corresponding more than or equal to initial MEP, illustrate that interval time is at this time
Through long enough, determine that initial MEP has arrived at the timing node for sending message at this time;When difference is corresponding less than initial MEP
When default minimum MEP sending cycle, illustrate that interval time is not enough at this time, determines that initial MEP is not reached also at this time and send CCM report
The timing node of text, also needs to continue waiting for.
Cycle timer is the multistage cycle timer as unit of microsecond in one of the embodiments, according to the period
Timer current time, initial MEP last time send time point and the corresponding default minimum of initial MEP of CCM message
MEP sending cycle, before judging whether to reach the step of initial MEP sends the timing node of CCM message further include:
Step 1: it obtains multistage cycle timer and advanced duration occurs.
Step 2: it sets the corresponding default minimum MEP sending cycle of initial MEP and is less than or equal to multistage cycle timer hair
Raw advanced duration.
Specifically, multistage cycle timer can be 7 grades of cycle timers.According to ITU (International
Telecommunication Union, International Telecommunication Union)-Y1731,802.1ag standard requirements, for CCM type
MEP, sending cycle can be set to 3.33 milliseconds, 10 milliseconds, 100 milliseconds, 1 second, 10 seconds, 1 minute, 10 minutes this 7 values.Cause
This, designs 7 grades of timer as unit of 1 microsecond, so that 7 different transmitting-receiving periods in standard have solely first
Vertical Timer metric.And 7 periods are answered with the register pair of 7 bytes.After chip powers on, 7 grades of timers are simultaneously
Start timing, and when expiring in each period, updates its corresponding bitmap.After the starting of multistage cycle timer, 7 grades of periods are fixed
When device start to carry out timing with core frequency, while the timing of microsecond also starts timing.When reaching a microsecond, all 7
Grade cycle timer all increases by a microsecond.Check whether having time arrives in single order (8 grades) cycle timer under 7 grades of cycle timers
Phase, if fruit has, 1 is being set by corresponding position in 8 grades of cycle timer bitmaps, then, which is being emptied, is opened
Beginning reclocking guarantees the continuity of periodic recording.Using 7 grades of timers, 7 CCM defined in corresponding 802.1ag agreement
Sending cycle guarantees that each period individually measures.
Specific application example will be used below, and it is one of real to explain in detail the method for the invention for uniformly sending CCM message
It applies in example, the detailed process of step S100 to step S400.
S1 obtains initial MEP, shoots the message bit pattern of cycle timer, is equivalent to a snapshot of fetch bit figure here,
In minimum MEP sending cycle according to the SNAPSHOT INFO, send set cycle CCM message in bitmap.S2 is from MEP configuration
Read the corresponding minimum MEP sending cycle of initial MEP.Message bit pattern of the S3 based on shooting cycle timer, calculates minimum MEP
The corresponding bitmap index of sending cycle.S4 judges whether the corresponding position of the bitmap index is default position (for example, 1) in bitmap, if
To preset position (1), then shows that the cycle timer has expired, i.e., have arrived at the time that initial MEP sends CCM message at this time
Node, MEP needs are given out a contract for a project;If not default position (0), then show that the timer in the period is also not yet due, also need to continue waiting for.
As shown in figure 3, a kind of system for uniformly sending CCM message, comprising:
Logging modle 100, for obtaining initial MEP, record period timer current time.
Time point obtains module 200, and the time point of CCM message is sent for obtaining initial MEP last time.
First judgment module 300, for sending CCM message according to cycle timer current time, initial MEP last time
Time point and the corresponding default minimum MEP sending cycle of initial MEP, judge whether to reach initial MEP and send CCM message
Timing node.
Sending module 400 is assembled, for assembling and sending CCM message when reaching.
Second judgment module 500, for judging whether initial MEP is the last one MEP.
First processing module 600, for after waiting predetermined time delay, obtaining when initial MEP is not the last one MEP
Remove a MEP.
Second processing module 700, for waiting the default final delay time when initial MEP is the last one MEP, when
When current time is aligned with default minimum MEP sending cycle, control logging modle 100 reacquires initial MEP.
The system that the present invention uniformly sends CCM message, logging modle 100 obtain initial MEP, and record period timer is current
Time, time point obtain module 200 and obtain the time point that initial MEP last time sends CCM message, first judgment module 300
Judge whether initial MEP has arrived at the timing node for sending message, when reaching, assembling sending module 400 is assembled and sent
CCM message, the second judgment module 500 judge whether initial MEP is the last one MEP, when not being, first processing module 600
Wait predetermined time delay after, obtain next MEP, when for when, Second processing module 700 wait preset the final delay time, when
When current time is aligned with default minimum MEP sending cycle, and controls logging modle 100 and reacquire initial MEP.Whole process
In, in conjunction with the setting of waiting pre-set delay and the setting of default final delay, it is ensured that sent in the corresponding default minimum MEP of initial MEP
In period, all MEP are uniformly sent out BFD message and MEP sending cycle is continuous.
As shown in figure 4, first judgment module 300 includes: in one of the embodiments,
Computing unit 320 sends CCM message for calculating cycle timer current time and initial MEP last time
Difference between time point.
Comparing unit 340, for comparing difference default minimum MEP sending cycle corresponding with initial MEP, judge whether to
The timing node of CCM message is sent up to initial MEP.
Cycle timer is the multistage cycle timer as unit of microsecond in one of the embodiments, is uniformly sent
The system of CCM message further include:
Advanced duration obtains module, and advanced duration occurs for obtaining multistage cycle timer.
Setting module, it is fixed less than or equal to the multistage period for setting the corresponding default minimum MEP sending cycle of initial MEP
When device advanced duration occurs.
First processing module 600 includes: in one of the embodiments,
First MEP number obtainment unit, for it is corresponding to obtain initial MEP when initial MEP is not the last one MEP
Default minimum MEP sending cycle domestic demand sends MEP quantity.
Pre-set delay determination unit is used for the corresponding default minimum MEP sending cycle of initial MEP divided by initial MEP pairs
The default minimum MEP sending cycle domestic demand answered sends MEP quantity, calculates pre-set delay.
First processing units obtain next MEP after waiting predetermined time delay.
Second processing module 700 includes: in one of the embodiments,
2nd MEP number obtainment unit, for it is corresponding pre- to obtain initial MEP when initial MEP is the last one MEP
If minimum MEP sending cycle domestic demand sends MEP quantity.
Default final delay determination unit, is used for the corresponding default minimum MEP sending cycle of initial MEP divided by initial
The corresponding default minimum MEP sending cycle domestic demand of MEP sends MEP quantity and remainder, calculates default final delay.
The second processing unit, for waiting the default final delay time, when current time and default minimum MEP send week
When phase is aligned, and controls logging modle 100 and reacquire initial MEP.
Only several embodiments of the present invention are expressed for above embodiments, and the description thereof is more specific and detailed, but can not
Therefore it is construed as limiting the scope of the patent.It should be pointed out that for those of ordinary skill in the art,
Under the premise of not departing from present inventive concept, various modifications and improvements can be made, and these are all within the scope of protection of the present invention.
Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (8)
1. a kind of method for uniformly sending CCM message, which is characterized in that comprising steps of
Obtain initial MEP, the current time of record period timer;
Obtain the time point that the initial MEP last time sends CCM message;The initial MEP last time sends CCM message
Time point obtained by analysis of history data;
Time point of CCM message and described is sent according to the cycle timer current time, initial MEP last time
The corresponding default minimum MEP sending cycle of initial MEP judges whether to reach the when segmentum intercalaris that the initial MEP sends CCM message
Point;
When reaching, assembles and send CCM message;
Judge whether the initial MEP is the last one MEP;
When the initial MEP is not the last one MEP, after waiting predetermined time delay, next MEP is obtained;
When the initial MEP is the last one MEP, the default final delay time is waited, when current time is preset most with described
Small MEP sending cycle be aligned when, return the acquisition initial MEP the step of;
It is described when the initial MEP is not the last one described MEP, after waiting predetermined time delay, obtain the step of next MEP
Suddenly include:
When the initial MEP is not the last one described MEP, obtains the corresponding default minimum MEP of the initial MEP and send week
Phase domestic demand sends MEP quantity;
The corresponding default minimum MEP sending cycle of the initial MEP is sent out divided by the corresponding default minimum MEP of the initial MEP
It send period domestic demand to send MEP quantity, calculates pre-set delay;
After waiting the predetermined time delay, next MEP is obtained.
2. the uniform method for sending CCM message according to claim 1, which is characterized in that described fixed according to the period
When device current time, the initial MEP last time send CCM message time point and the initial MEP it is corresponding default
Minimum MEP sending cycle judges whether that reaching the step of initial MEP sends the timing node of CCM message includes:
It calculates the cycle timer current time and the initial MEP last time was sent between the time point of CCM message
Difference;
Compare the difference default minimum MEP sending cycle corresponding with the initial MEP, judges whether to reach described initial
The timing node of MEP transmission CCM message.
3. it is according to claim 1 it is uniform send CCM message method, which is characterized in that the cycle timer be with
Microsecond is the multistage cycle timer of unit;
It is described according to the cycle timer current time, initial MEP last time send CCM message time point and
The corresponding default minimum MEP sending cycle of the initial MEP judges whether to reach the time that the initial MEP sends CCM message
The step of node includes:
It obtains the multistage cycle timer and advanced duration occurs;
It sets the corresponding default minimum MEP sending cycle of the initial MEP and is less than or equal to the multistage cycle timer generation
Advanced duration.
4. the uniform method for sending CCM message according to claim 1, which is characterized in that described when the initial MEP is
When the last one described MEP, the default final delay time is waited, when current time and the default minimum MEP sending cycle pair
Qi Shi, return the acquisition initial MEP the step of include:
When the initial MEP is the last one described MEP, the corresponding default minimum MEP sending cycle of the initial MEP is obtained
Domestic demand sends MEP quantity;
The corresponding default minimum MEP sending cycle of the initial MEP is sent out divided by the corresponding default minimum MEP of the initial MEP
It send period domestic demand to send MEP quantity and remainder, calculates default final delay;
The default final delay time is waited, when current time is aligned with the default minimum MEP sending cycle, the acquisition
The step of initial MEP.
5. a kind of system for uniformly sending CCM message characterized by comprising
Logging modle, for obtaining initial MEP, the current time of record period timer;
Time point obtains module, and the time point of CCM message is sent for obtaining the initial MEP last time;The initial MEP
The time point that last time sends CCM message is obtained by analysis of history data;
First judgment module, for sending CCM report according to the cycle timer current time, the initial MEP last time
Time point and the initial the MEP corresponding default minimum MEP sending cycle of text judge whether to reach the initial MEP hair
Send the timing node of CCM message;
Sending module is assembled, for assembling and sending CCM message when reaching;
Second judgment module, for judging whether the initial MEP is the last one MEP;
First processing module, for when the initial MEP is not the last one MEP, after waiting predetermined time delay, under acquisition
One MEP;
Second processing module, for the default final delay time being waited, when current when the initial MEP is the last one MEP
When time is aligned with the default minimum MEP sending cycle, and controls the logging modle and reacquire the initial MEP;
The first processing module includes:
First MEP number obtainment unit, it is described initial for obtaining when the initial MEP is not the last one described MEP
The corresponding default minimum MEP sending cycle domestic demand of MEP sends MEP quantity;
Pre-set delay computing unit, for will the corresponding default minimum MEP sending cycle of the initial MEP divided by it is described initially
The corresponding default minimum MEP sending cycle domestic demand of MEP sends MEP quantity, calculates pre-set delay;
First processing units obtain next MEP after waiting the predetermined time delay.
6. the uniform system for sending CCM message according to claim 5, which is characterized in that the first judgment module packet
It includes:
Computing unit sends CCM message for calculating the cycle timer current time and the initial MEP last time
Difference between time point;
Comparing unit judges whether for the difference default minimum MEP sending cycle corresponding with the initial MEP
Reach the timing node that the initial MEP sends CCM message.
7. it is according to claim 5 it is uniform send CCM message system, which is characterized in that the cycle timer be with
Microsecond is the multistage cycle timer of unit;
The uniform system for sending CCM message further include:
Advanced duration obtains module, and advanced duration occurs for obtaining the multistage cycle timer;
Setting module is less than or equal to the multistage week for setting the corresponding default minimum MEP sending cycle of the initial MEP
Advanced duration occurs for phase timer.
8. the uniform system for sending CCM message according to claim 5, which is characterized in that the Second processing module packet
It includes:
2nd MEP number obtainment unit, for obtaining the initial MEP when the initial MEP is the last one described MEP
Corresponding default minimum MEP sending cycle domestic demand sends MEP quantity;
Default final delay computing unit, for will the corresponding default minimum MEP sending cycle of the initial MEP divided by the beginning of described
The corresponding default minimum MEP sending cycle domestic demand of beginning MEP sends MEP quantity and remainder, calculates default final delay;
The second processing unit, for waiting the default final delay time, when current time and the default minimum MEP are sent
When period is aligned, controls the logging modle and reacquire the initial MEP.
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CN102970171A (en) * | 2012-12-06 | 2013-03-13 | 盛科网络(苏州)有限公司 | Method for realizing multiple operations, administration and maintenance (OAM) time precision through chip level |
CN103312633A (en) * | 2013-05-14 | 2013-09-18 | 盛科网络(苏州)有限公司 | Method and device for enabling switch chip to generate OAM (Operation Administration and Management) messages at constant speed |
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CN102546404A (en) * | 2011-12-27 | 2012-07-04 | 盛科网络(苏州)有限公司 | Method and system for optimizing MEP (message exchange pattern) packet sending time in OAM (operation administration and maintenance) chip |
CN102970171A (en) * | 2012-12-06 | 2013-03-13 | 盛科网络(苏州)有限公司 | Method for realizing multiple operations, administration and maintenance (OAM) time precision through chip level |
CN103312633A (en) * | 2013-05-14 | 2013-09-18 | 盛科网络(苏州)有限公司 | Method and device for enabling switch chip to generate OAM (Operation Administration and Management) messages at constant speed |
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