CN1286301C - Two-way loop network loop-number consulation method - Google Patents
Two-way loop network loop-number consulation method Download PDFInfo
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- CN1286301C CN1286301C CN 200310101809 CN200310101809A CN1286301C CN 1286301 C CN1286301 C CN 1286301C CN 200310101809 CN200310101809 CN 200310101809 CN 200310101809 A CN200310101809 A CN 200310101809A CN 1286301 C CN1286301 C CN 1286301C
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Abstract
The present invention discloses a ring number negotiation method of a two-way ring network, which belongs to the field of network communication. Firstly, a site sends out a ring number request frame, if the other site has a ring number, the other site sends out a ring number response frame; if the ring number does not exists, the other site also sends a ring number request frame. The ring number negotiation is carried out among all the sites according to the received ring number request frame. According to the requirements of RPR standard, all the sites are equal, and a main site can not exist. Thus, the algorithm used in the negotiation is vote for the ring number carried out among the sites on a ring network. When sends out the ring number request frame, each site can carry a default ring number of the site, and the ring number is obtained based on the results of votes. If the site detects the inconsistent problem between the ring number and the site, the negotiation is carried out again. The present invention can effectively overcome the defects that the existing RPR standard requires plug and play characteristics but needs manual configuration of the ring number. The present invention simplifies processes for building the a network of an RPR ring network, increases the flexibility of site maintenance and the correction capability of RPR.
Description
Technical field
The present invention relates to field of network communication, relate in particular to the number of ring negotiation method in the two-way loop network of network system.
Background technology
Data communication has obtained increasingly extensive application in social every field, become the indispensable main information interchange mode of people's live and work, become increasingly abundant at desired content, demand type is also constantly under the condition of enlarged, requirement for data communication technology is also more and more higher, for metropolitan area network data communication field, this requirement is more outstanding.RPR protocol (the Resilient Packet Ring that IEEE 802.17 working groups in the International Standards Organization carry out, be called for short RPR), be a kind of novel MAC (Medium access control, MAC layer, a kind of data link controlling mechanism that has nothing to do with physical layer) layer protocol, the main purpose of proposition is to optimize the transmission of packet.This agreement has absorbed economy, SDH (the Synchronous Digital Hierarchy of Ethernet; SDH (Synchronous Digital Hierarchy)) to the strictness guarantee of time-delay and shake, reliable clock and characteristic such as 50ms ring protection and recovery; and have characteristics such as spatial reuse, Bandwidth Dynamic Allocation, supporting business rank; make it become a kind of main optimisation technique of current network transmitting data bag; just obtain the extensive concern and the attention of industry, can satisfy the more and more higher transfer of data requirement of metropolitan area network.In fact, the RPR technology also makes operator provide carrier grade service to become possibility in metropolitan area network at lower cost, has reduced the transmission expense when SONET (SynchronousOptical Network)/SDH level network survivability is provided.IEEE802.17 working group is also carrying out the formulation work of RPR standard at present, and the RPR standard is in the draft stage, and concrete version number is also bringing in constant renewal in, and submitting to after waiting to obtain to stablize becomes official standard.In the RPR draft standard, a main realization that advantage is exactly a plug-and-play feature mainly realizes this function by methods such as Topology Discovery and broadcast station information.But in RPR, the realization of its Topology Discovery and broadcast station information has a prerequisite, and ring is set up exactly, the number of ring has distributed and it is normal fully to encircle.Reach such effect, need fulfil ahead of schedule and comprise and distribute ring number, number connect ring, also will guarantee to occur work such as any connection error according to the ring that distributes.If after website disconnected from loop network, when reconnecting on the loop network, it is true that the wiring of two ports is easy to malunion, thereby cause the ring can't operate as normal, more can't reach the effect of plug and play.And such shortcoming can not be resolved in Topology Discovery and broadcast station information approach.
United States Patent (USP) (20030072259) " Auto-configuration of networkinterfaces in a bidirectional ring network " has proposed a kind of ring automatic configuration method, at first hold consultation between two websites, negotiation method is to select according to unique numbering between two websites, after having consulted, other websites are directly obtained these two websites and are consulted the ring that obtains number.The weak point of this method is: be only applicable to not ring number this simplest situation of stylish networking, and do not support a plurality of websites to join the situation on the loop network simultaneously, the more important thing is that this method can not support the website of existing ring number to continue to add on the loop network, and do not have error correcting capability.
Summary of the invention
The objective of the invention is to overcome the plug-and-play feature that can't satisfy the RPR draft standard that prior art exists, do not support a plurality of websites to join loop network simultaneously, can not support the website of existing ring number to continue to add loop network, and the shortcoming that does not have error correcting capability, can effectively realize plug-and-play feature in the hope of providing a kind of, realize a plurality of websites and existing ring website are added simultaneously the ring machinery of consultation of the two-way loop network of loop network and effectively error correction.
The core concept of the method for the invention is: for guarantee can the number of ring to consult between all websites on the loop network, the mode of taking to send request/acknowledgement frame between website realizes: at first send the ring claim frame by website, if other websites have the ring number, then send a ring acknowledgement frame; If no, other websites also can send the ring claim frame, and all websites are consulted according to the ring claim frame number of ring of receiving.Requirement according to the RPR standard, all websites all are equality, there is not a home site, therefore the algorithm of consulting to adopt is the election of website number of ring all on the loop network, each website all can carry a default ring of this website number when sending ring claim frame, obtain to encircle number according to the result of election.If website detects ring number and this website inconsistent, then hold consultation again.
For achieving the above object, the present invention proposes a kind of ring machinery of consultation of two-way loop network, it is characterized in that, may further comprise the steps:
The first step: after not having the website of ring number to be connected on the loop network, outwards send a ring claim frame (comprise two different default rings number, frame type adopts the control frame type of expanding in the RPR standard, is frame type A, is a kind of broadcast frame);
Second step: if the Source Site is new the adding in the ring (comprising the website that resets), other websites do not change, then the adjacent sites on the loop network sends an acknowledgement frame (frame type B also is a kind of broadcast frame), and oneself ring number is put in the acknowledgement frame sends;
The 3rd step: if also have also ring number not of other websites on the loop network, then these websites send the ring claim frame that this request encircles number simultaneously; If have only a ring to receive the ring claim frame that same website sends, then ignore this ring claim frame; If the ring claim frame that all websites of receiving send all has only one, then do not consult the ring number.This ring claim frame of the transmission that website keeps forms up to circulus.
The 4th step: if website is received the ring claim frame that same website sends from two rings, each does not have the website of ring number according to default ring number (0 or 1) summation back of the ring claim frame received (comprise in the ring claim frame that oneself sends out ring number), the summed result of each website is identical, (send the website number of request with the frame number of receiving, comprise website oneself) relatively, if and greater than half of website number, ring number=1 then; If less than half, then the ring number=0.If the result of summation equals to receive half of frame number, this website unique number relatively, this numbering can adopt this fixing numbering in mac address, also can adopt this dynamic numbering of timestamp, chooses the ring number in the frame that numbering is little among both.
The 5th step: if receive the acknowledgement frame of the frame type B that sends in second step in the negotiations process in third and fourth step in the above, then stop top operation, take out the ring number in the frame.This step is used for a plurality of websites and adds situation on the ring simultaneously.
The 6th step: if process is finished after T after a while in the above
bAfter, do not receive the acknowledgement frame of frame type B, do not consult the website of ring number before illustrating on the loop network.Like this, website sends acknowledgement frame (frame type B) and gives other websites, (it is exactly will all website rings number consistent that ring number is consulted in the ring comparison that one or more acknowledgement frames that each website will be received are chosen with oneself, website has two rings, ring number is meant that certain ring that all websites connect into ring all is ring or an outer shroud in being made into, the another one ring is then opposite, and interior ring of affirmation or outer shroud are exactly with ring number sign between website.If the time that receive and own inconsistent, consult again), unanimity just stops to consult, otherwise just consults again.Any website receive this frame and more identical after then need not continue to send oneself acknowledgement frame.
The 7th step: if the ring that receives number and this website is inconsistent, all websites are consulted again.The method of election is still adopted in negotiations process, according to all websites in the top step all do not have the ring number situation carry out.This step is applicable to that the website of existing ring number adds the situation on the loop network.Be mainly used in the recovery of fault.
The method of the invention number is consulted by the ring between a plurality of websites on the RPR loop network, does not need manual configuration can allow website obtain the purpose of ring number thereby reach, thereby makes RPR loop network operate as normal.The present invention can effectively overcome the characteristic of existing RPR standard-required plug and play, the deficiency that but needs manual configuration ring number, really accomplish plug and play, it is very convenient to make that website is connected on the RPR loop network, even connection error can make the ring operate as normal through consultation.Adopt the method for the invention, compared with prior art, simplify the networking process of RPR looped network greatly, improved the flexibility of station maintenance, strengthened the error correcting capability of RPR.
Description of drawings:
Fig. 1 be in the method for the invention not the single website of ring number consult flow chart.
Fig. 2 is as two websites connections of one embodiment of the present invention but constitutes the connection layout that encircles.
Fig. 3 is the RPR ring connection layout that adopts two websites of the method for the invention.
Fig. 4 is as three websites connections of another execution mode of the present invention but constitutes the connection layout that encircles.
Fig. 5 is the RPR ring connection layout that adopts three websites of the method for the invention.
Fig. 6 is the flow chart that website is handled the ring claim frame in the method for the invention.
Fig. 7 is the frame type structure chart of ring of the present invention number negotiation frame.
Embodiment
The invention will be further described below in conjunction with embodiment:
The present invention mainly is that the method by ring number election realizes that the ring number between website consults in Resilient Packet Ring (RPR) network, makes each website obtain the number of ring automatically and has error correcting capability under ring number does not match situation.Ring number corresponds respectively to the interior ring and the outer shroud of two-way loop network, and the ring of all websites number must be consistent on each loop network, and ring could operate as normal, and the process of negotiation is exactly that the ring of ring and outer shroud in making is number consistent.In the RPR network, the situation of need consulting ring number mainly comprises following several: (1) website power on, reset (being connected on the loop network); (2) one or more new site add on the loop network; (3) two of website ports all disconnect the back from loop network and recover connection.After single port disconnected, website still was connected on the loop network by the another one port, did not need to redistribute ring number; (4) two summits of a string website of constituting of a plurality of continuous websites are from being connected to the situation on the loop network after loop network disconnects again.Correspondingly, each website is mainly consulted according to the following rule number of ring: (1) when website not have ring number or the ring received number and self loop when number inconsistent, needs to consult to encircle number.Website that intend to consult ring number sends a ring claim frame (frame type A) on loop network; When (2) any website is received ring claim frame (frame type A), if this website has had the ring determined number and according to ttl (time tolive, the jumping figure that carries in the frame) judges adjacent website (ttl=ttlbase-1, ttlbase is the initial ttl that carries in the frame), directly send ring acknowledgement frame (frame type B) and give the website that sends the ring claim frame.If this website is determined ring number also will send the ring claim frame, receive the ring claim frame of other websites simultaneously).For the ring claim frame (frame type A) that arbitrary website is received, the frame of same source MAC must be an a pair of ring number opposite frame, and other information of frame are identical; If the ring claim frame of receiving (frame type A) has the frame of same source MAC and ring number identical, then only keep that frame of receiving the earliest; (3) website sends ring acknowledgement frame (frame type B) on the loop network, and this frame has carried the ring determined number, after other websites are received, if this website ring number not number is adjusted oneself ring number according to the ring of this frame; If existing ring number, and and frame in ring number coupling, do not handle, otherwise consult ring number again; (4) website is received ring acknowledgement frame (frame type B) on certain loop network, need be with the ring comparison of the acknowledgement frame received on ring in the frame number and the another one loop network.Iff the ring control frame of receiving monocycle and there is a port not connect, on the loop network of this direction, send ring acknowledgement frame (frame type B) after calculating the ring number of another ring; (5) after website obtained ring number, no longer the number of ring was consulted.If obtain ring number, then regularly on loop network, send ring claim frame (frame type A); (6) after loop network has been set up,, then do not need to consult again if the website on the loop network only disconnects a port and recovery from loop network.(7), then send after the ring request directly from adjacent sites and obtain ring number if the website on the loop network disconnects two ports and recovers from loop network to be connected.(8) if adjacent two or more websites disconnect, it is number inconsistent to recover the back ring, then needs to consult again ring number, and machinery of consultation is all websites as the website that does not distribute ring number, and default value is exactly a previously used ring number.
Fig. 1 is process and the step of single website when consulting rings with other websites of describing ring not number.The process of ring number negotiation is described with the process of setting up of a ring below.For the situation of single site, need not consult the ring number.After adding a website, when also not connecting into ring-type (as shown in Figure 2), this website that increases newly constantly outwards sends ring claim frame, and each website can be received a ring claim frame, and this situation does not consult to encircle number yet.After forming ring-type (as shown in Figure 3), then need to begin to consult ring number.When each website all outwards sent the ring claim frame, each website was all received the frame of two different rings number of same source address from two loop network.With the ring in the frame number and own ring number summation and several 2 divided by website, obtain to encircle number according to result of calculation, 1 representative ring number is that 1,0 representative ring number is 0.If the result is 0.5, then take out the site number in the frame, choose the ring number.After website has calculated, send acknowledgement frame after when waiting for one section, receive simultaneously acknowledgement frame and and the ring comparison that oneself calculates, identical then explanation negotiation is finished, otherwise consults and produce error message again.After having consulted, each website all obtains correct ring number.At this time, if add the 3rd website but when not constituting ring-type (as shown in Figure 4), then after initiate website sent ring claim frame, adjacent website directly sent acknowledgement frame according to the value of ttl, this website can directly obtain to encircle from its frame number.At this time, because a port do not have link, website need send the ring number that an acknowledgement frame is confirmed this ring on the another one loop network.In fact, under situation shown in Figure 5, also can obtain ring number after each website constitutes ring-type, initiate website can be received two acknowledgement frames that adjacent two websites send, and takes out the ring number in the frame, and website does not need to send acknowledgement frame.
If add more multi-site, its situation is similar to said process, and can add a plurality of websites simultaneously.Initiate website sends the ring claim frame, will send acknowledgement frame after the website on the loop network is received, website is provided with the ring number of oneself according to acknowledgement frame.Difference with above-mentioned process is, when adding a plurality of continuous websites simultaneously and not constituting ring-type, after new site is received acknowledgement frame, need on the another one loop network, send an acknowledgement frame at the outmost website that has a port not have link, like this, other new site can obtain correct ring information.
For new adding website had the ring number situation, after often appearing at ring and having built up, and after certain site disconnects from loop network, when reconnecting on the loop network, for the website website that disconnects from loop network, disconnect the back at it and just lose ring number automatically.If initiate a plurality of continuous website has had ring number, and ring number and original ring number coupling, then do not need to consult again ring number; If the existing ring of initiate a plurality of continuous website number, and ring number and original ring number do not match then needs to consult again ring number, all websites all will be redistributed ring number.When consulting ring, the former ring of all websites number is put in the ring claim frame as default ring number.The ring of all websites number all will be consulted again, and negotiations process is equivalent to the new ring that all websites all do not have ring number.The ring negotiations process of new ring above concrete steps are seen.Again consult ring pattern of wants ring-type, otherwise can not consult to encircle number.If initiate website has only one, this website need resend the ring claim frame, and negotiations process is identical with new site.
Fig. 6 has the website of ring number to reply the flow chart of initiate website.At first, website is waited for and is received the ring claim frame.Website sends acknowledgement frame after receiving the ring claim frame then.Also can receive the acknowledgement frame of other websites when website sends acknowledgement frame, relatively ring in the frame number and own ring number are inconsistently just consulted to encircle number again.Be to realize that ring number consults the explanation of necessary frame format and some parameters below.In the frame format of ring number negotiation, ring ring claim frame and acknowledgement frame adopt the control frame form of RPR standard, the both is non-expansion frame (ef=0 in the frame format), only is that control frame type controlType has increased a kind of type code, 06 among type code such as Fig. 7.Other frame parameter and value comprise:
Sc:CLASS_A0, service type is a highest level
ControlDataUnit: the payload of frame
| Ring ID | Frame type (A|B) |
| Site number | |
A (00) class representative ring claim frame, B (01) class is represented acknowledgement frame.
The ring number that receives the category-A frame must be number opposite with the ring of another frame of homology.Receiving needs behind the frame of type B according to the content modification ring of frame number.
Because ring number is consulted will to finish before the ring operate as normal, so the information that ring number is consulted to use must be very limited, a lot of information in the RPR standard all can not be used.The information spinner of ring number negotiation needs will comprise following several: the mac address of the Link State of website, website, ttl (being used to obtain newly to add the adjacent sites of website).The variable that needs in the ring negotiations process to use mainly comprises frame type, ring number, site number, reset and sends the time interval T of ring ring claim frame (frame type A) to the ring claim frame that receives other website from website
a, consult to finish the time interval T of back transmission acknowledgement frame
b(T
bAnd T
aIdentical), website following cycle of situation of not obtaining the number of ring sends the transmission interval T of ring claim frame (frame type A)
f(T
fBe less than T
a).
For reset, 0 is used for representative ring number determines that this website just sends acknowledgement frame when receiving ring claim frame in encircling.1 representative ring number is not also determined, needs to consult or consulting.Ring of receiving behind the acknowledgement frame or having consulted number and acknowledgement frame consistent, reset can be changed to 0; If the acknowledgement frame of receiving and this website is inconsistent, the perhaps ring mistake of other data, control frame, reset is changed to 1, consults ring number again.For T
a, need guarantee that website can receive the ring claim frame that sends of all websites under the ring normal condition.Each T
aCycle all can form a table.
| The Mac address | The ring number | Site number |
| 00-10-4B-15-59-2F | 0 | |
| 00-10-4B-15-59- | 1 | |
| 00-10-5C-B5-60-A2 | 0 | |
| 00-10-5C-B5-60- | 1 |
The target that ring number is consulted to reach mainly comprises: when website all not have ring, needs formation circulus could be consulted; When website had ring on the loop network, initiate website can directly be assigned to ring number, did not form ring-type and also can obtain ring number, had a port to be connected on the loop network and get final product, and simultaneously, ring number consults also that support adds a plurality of websites simultaneously; After two ports of website exchange, can obtain new ring number; When a string website that a plurality of websites constitute on loop network, two summit ports end to end of exchange string, can obtain new ring number.But ring number consults not support a string website to be connected to again on the loop network after loop network disconnects, and when finding that ring number does not match, only have only a summit port of string, and another one summit port is not connected to the situation on the loop network.This situation only supports to form the negotiation after the ring-type.
After can making website be connected on the RPR loop network, the present invention do not need the manual configuration of the number of ring just automatically to obtain ring number, and also can adjust ring number during connection error automatically, make whole ring working properly, again do not worried meeting connection error when connecting looped network, can at will insert website, reach real plug and play.After website connects into ring-type, no matter be new networking or network operation stage, can hold consultation and obtain ring number, can be consensus even ring is number inconsistent on the looped network; Even not pattern of wants ring-type can obtain ring number when a plurality of new site of ring number do not add on the loop network simultaneously.
Claims (8)
1, a kind of ring machinery of consultation of two-way loop network is characterized in that, may further comprise the steps:
The first step: do not have the ring number website be connected on the loop network after, outwards send a ring claim frame;
Second step: if the Source Site is new the adding in the ring, and other websites do not change, and then the adjacent sites on the loop network sends an acknowledgement frame, and oneself ring number is put into sends in the acknowledgement frame;
The 3rd step: if also have also ring number not of other websites on the loop network, then these websites send the ring claim frame that this request encircles number simultaneously; If have only a ring to receive the ring claim frame that same website sends, then ignore this ring claim frame; If the ring claim frame that all websites of receiving send all has only one, then do not consult the ring number; This ring claim frame of the transmission that website keeps forms up to circulus;
The 4th step: if website is received the ring claim frame that same website sends from two rings, each website that does not have a ring number is according to the default ring of ring claim frame received number with after the ring in the ring claim frame that sends out of the website oneself that should not have to encircle number number sues for peace, the summed result of each website is identical, with the frame number of receiving relatively, if and greater than half of website number, ring number=1 then; If less than half, then the ring number=0; If the result of summation equals to receive half of frame number, this website unique number relatively then;
The 5th step: if process is finished after T after a while in the above
bAfter, do not receive the acknowledgement frame of frame type B, then send acknowledgement frame to other websites by website, one or more acknowledgement frames that each website will be received and the ring comparison of oneself choosing, unanimity just stops to consult, otherwise just consults again; Any website receive this frame and more identical after then need not continue to send oneself acknowledgement frame.
2, the ring machinery of consultation of two-way loop network as claimed in claim 1, it is characterized in that the ring claim frame described in the first step comprises two different default rings number, frame type adopts the control frame type in the expansion RPR standard, being frame type A, is a kind of broadcast frame.
3, the ring machinery of consultation of two-way loop network as claimed in claim 1 is characterized in that, second step, described acknowledgement frame was frame type B, was a kind of broadcast frame.
4, the ring machinery of consultation of two-way loop network as claimed in claim 1 is characterized in that, the default ring of the ring claim frame described in the 4th step number is 0 or 1.
5, the ring machinery of consultation of two-way loop network as claimed in claim 1, it is characterized in that, numbering described in the 4th step can adopt this fixing numbering in mac address, also can adopt this dynamic numbering of timestamp, chooses the ring number in the frame that numbering is little among both.
6, the ring machinery of consultation of two-way loop network as claimed in claim 1 is characterized in that, the information spinner of ring number negotiation needs will comprise a little Link State, the mac address of website, ttl in third and fourth step; The variable that needs in the ring negotiations process to use mainly comprises frame type, ring number, site number, reset, sends the ring claim frame to the time interval T that receives other website ring claim frames from website
a, consult to finish the time interval T of back transmission acknowledgement frame
b, the cycle sent the transmission interval T of ring claim frame when website obtained the number of ring
f
7, the ring machinery of consultation of two-way loop network as claimed in claim 1, it is characterized in that, if exist a plurality of websites to add situation on the ring simultaneously, after then in the negotiations process in described third and fourth step, receiving the acknowledgement frame of the frame type B that sends in second step, stop negotiation, take out the ring number in the acknowledgement frame.
8, as the ring machinery of consultation of claim 1 or 7 described two-way loop networks, it is characterized in that, website at existing ring number adds under the situation of loop network, if the ring of the ring that receives number and this website is number inconsistent, then all websites are consulted again, the method of election is still adopted in negotiations process, according to all websites all do not have the ring number situation carry out.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310101809 CN1286301C (en) | 2003-10-17 | 2003-10-17 | Two-way loop network loop-number consulation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310101809 CN1286301C (en) | 2003-10-17 | 2003-10-17 | Two-way loop network loop-number consulation method |
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| Publication Number | Publication Date |
|---|---|
| CN1529477A CN1529477A (en) | 2004-09-15 |
| CN1286301C true CN1286301C (en) | 2006-11-22 |
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|---|---|---|---|
| CN 200310101809 Expired - Fee Related CN1286301C (en) | 2003-10-17 | 2003-10-17 | Two-way loop network loop-number consulation method |
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| CN (1) | CN1286301C (en) |
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