CN1728674A - Method and device for implementing upper ring and lower ring of flexible gruoping ring - Google Patents
Method and device for implementing upper ring and lower ring of flexible gruoping ring Download PDFInfo
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- CN1728674A CN1728674A CN 200410070697 CN200410070697A CN1728674A CN 1728674 A CN1728674 A CN 1728674A CN 200410070697 CN200410070697 CN 200410070697 CN 200410070697 A CN200410070697 A CN 200410070697A CN 1728674 A CN1728674 A CN 1728674A
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Abstract
The device includes process modules in 2 / 3 layers, selection / service sort module, module of packaging / peeling off module, service bandwidth control module and control part. Without increasing overhead, the method can realize functions for loading service to ring or unloading service from ring in RPR standard, not only supports RPR related functions such as direct conversion between Ethernet frame and RPR frame, sorting services, ring selection according to service grade etc, but also supports transparent bridge and VLAN bridge. Thus, RPR ring network supports exchange in second layer and third route, supports VLAN, STP etc. second layer protocol and third layer protocol as well as supports unicast, multicast, and broadcast. The method can prevent data steam on ring from flooding to network connected to RPR bridge.
Description
Technical field
The present invention relates to network and communication field, be specifically related to the professional method and apparatus of ring up and down of a kind of RPR (Resilient Packet Ring, Resilient Packet Ring).
Background technology
The RPR looped network is the network of a MAC layer, is formed by connecting by many RPR websites, and all websites constitute a broadcast domain on the ring, and its jackshaft is the professional website of ring up and down, as shown in Figure 1.Suggestion RPR bridge should be consistent with IEEE 802.1Q VLAN bridge with the transparent bridge of IEEE 802.1D in RPR standard IEEE 802.17 appendix.Publication number is 20030074469 U.S. Patent application: Method and apparatus for transparent LAN-to-LANconnection between two customer locations through a RPR data transport network, proposed a kind ofly to add that before Ether frame a control is packaged into the processing method of RPR frame behind the frame head again, this method of adding the control frame head before Ether frame has increased expense, can not on ring, directly transmit Ether frame simultaneously, can not directly support transparent bridge and VLAN bridge.
Summary of the invention
The present invention proposes the method and apparatus that a kind of RPR of realization business is encircled up and down, do not need to increase expense and just can realize professional ring function up and down in the RPR standard, can not only support the correlation function of RPR, can also support the function of transparent bridge and VLAN bridge, realize that classify traffic directly encircles up and down in the mode of 2 layers and 3 layers.
The device that realization of the present invention RPR business is encircled up and down is by forming with lower module: 2/3 layer of processing module, encircle selection/classification of transaction module, frame head encapsulation/strip module, service bandwidth control module;
Described 2/3 layer of processing module finished 2/3 layer of processing of Ether frame, is in first module that ring is handled on the data flow and encircles last module of handling down;
Described ring selection/classification of transaction module carries out business classification and ring is selected, in last ring is handled, be positioned at 2/3 layer of processing after, encircle and after trade-off decision is finished the frame that also needs to encircle delivered to frame head rewriting/strip module, otherwise abandon; The frame of ring all can be assigned to a grade of service on each;
Frame head rewriting/strip module is in last ring is handled, the nose heave RPR frame head of being write as of Ether frame; In ring is handled down, the RPR frame head is peeled off, form complete Ether frame;
The service bandwidth module, in last ring was handled, according to grade of service control bandwidth, A service had the highest priority, and category-B takes second place, and the C class is minimum, is to go up last part that ring is handled;
Control module is used to manage and fill in the control information of each several part, and control information is kept in the form and configuration information of various piece storage.
The method that realization RPR business of the present invention is encircled up and down owing to Business Stream is divided into ring and encircles both direction down, is encircled the processing that method also comprises both direction up and down: go up to encircle and handle and encircle down and handle.
Last ring is handled:
The first step: 2/3 layer of processing, for what determine upward to encircle, then changeed for second step;
Second step: three the different grades of service of A, B, C that the CoS of Ether frame (Class ofService, the grade of service) are mapped to RPR;
The 3rd step: high-priority service is encircled selection, comprise A, b service; The ring selection operation is according to source port or vlan information searching high-priority service ring option table, and this table is filled in by control section, is used to specify the ring selection result of high-priority service.Can adopt the static configuration method of specifying ring to select, also can adopt Dynamic Configuration, such as site distance information such as flow on, ring according to looped network information according to control information.For determining to encircle selection result, jumped to for the 5th step, otherwise continued for the 4th step;
The 4th step: the low priority traffice ring is selected.C service and previous step are searched A, the b service of failure need search low priority traffice ring option table, select according to purpose mac address, combine according to information such as the flow on the RPR port of learning this address, topological database, the ring or several information by control section and fill in.If search failure, take out the ring of acquiescence and select to be provided with.Ring is selected to select two rings simultaneously, is used for two-way inundation.The low priority traffice ring is selected also can obtain from 2 layers of table when handling for 2 layers.
The 5th step: after determining the ring selection result, carry out the frame head information processing, finish the conversion of Ether frame to the RPR frame; According to the frame format difference, frame head information obtains from inundation information and frame head information table respectively, and this information is disposed by control section.
The 6th step: the RPR frame is delivered to the corresponding priority level formation carry out sending on the corresponding ring after the bandwidth control through the reshaper of different business grade then.
Following ring is handled:
The first step: peel off the RPR frame head, remaining part is a complete Ether frame.Two kinds of frame formats are handled respectively.
Second step: the destination address that takes out the Ether frame of peeling off back formation is looked into 2 layers of table, if destination address is acquired from ring, abandons this frame, prevents to be flooded to outside the ring.
The 3rd step: 2,3 layers of processing, comprise 2 layers of exchange and 3 layers of route, and source address study.
Adopt the method for the invention, under the situation that does not increase expense, just can realize professional ring function up and down in the RPR standard, can not only support direct conversion, business between Ether frame and the RPR frame to classify, encircle RPR correlation functions such as selection by the grade of service, the more important thing is the function that to support transparent bridge and VLAN bridge, make the RPR looped network support 2 layers of exchange and 3 layers of route, 2 layer protocols such as supported vlans, STP and 3 layer protocols are supported clean culture, multicast, the broadcasting of Ethernet; Can prevent simultaneously on the network that the traffic flood on the stop ring connects to the RPR bridging.
Description of drawings
Fig. 1 is a RPR looped network schematic diagram;
Fig. 2 is a kind of execution mode schematic diagram that RPR bridge service of the present invention encircles up and down;
Fig. 3 is the another kind of execution mode schematic diagram that RPR bridge service of the present invention encircles up and down;
Fig. 4 is the business of the present invention system construction drawing of loop device up and down.
Embodiment
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme:
Corresponding to above-mentioned method and apparatus, two kinds of concrete execution modes can be arranged, a kind of two ports of the RPR of being bridge website adopt same module to handle, as Fig. 2, each port is corresponding to the reception of a ring and the transmission of another ring, following ring and the data of upward encircling all will be passed through same module, and (the module here refers to 2/3 layer of processing module, ring selection/classification of transaction module, frame head rewriting/released part and service bandwidth module, be used for Data Stream Processing) handle decision ring selection result, frame head information etc.; Another kind is that each port adopts a module respectively, two modules are identical, come the unanimity of retentive control information between the module by communication, as Fig. 3, two modules are received same Ether frame simultaneously outside encircling, the information individual processing according to control section provides sends on the ring at last, can be to encircle, also can encircle from two ports simultaneously from a port.The difference of two kinds of execution modes mainly is that the various piece of device will be divided into two, and control section can divide and can be regardless of.Here describe according to second kind of execution mode, professional loop device structure chart such as Fig. 4 up and down, here the port that only draws is by forming with lower module: 2/3 layer of processing module, ring selection/classification of transaction module, frame head encapsulation/strip module, service bandwidth control module;
Described 2/3 layer of processing module finished 2/3 layer of processing of Ether frame, is in first module that ring is handled on the data flow and encircles last module of handling down;
Described ring selection/classification of transaction module carries out business classification and ring is selected, in last ring is handled, be positioned at 2/3 layer of processing after, encircle and after trade-off decision is finished the frame that also needs to encircle delivered to frame head rewriting/strip module, otherwise abandon; The frame of ring all can be assigned to a grade of service on each;
Frame head rewriting/strip module is in last ring is handled, the nose heave RPR frame head of being write as of Ether frame; In ring is handled down, the RPR frame head is peeled off, form complete Ether frame;
The service bandwidth module, in last ring was handled, according to grade of service control bandwidth, A service had the highest priority, and category-B takes second place, and the C class is minimum, is to go up last part that ring is handled;
Control module is used to manage and fill in the control information of each several part, and control information is kept in the form and configuration information of various piece storage.
Last ring processing procedure:
1, the modification to Ether frame is finished in 2/3 layer of processing, comprises the modification of vlan tag, the distribution of priority etc., and 3 layers of route also need to revise the destination address and the source address of ether frame head, goes up ring if desired, the step below continuing.At this moment Ether frame is determined, comprises source and destination address and priority etc.
2, the priority mapping of Ethernet is arrived the grade of service of RPR, rule is as table 1.The mapping back obtains the SC (service class, the grade of service) of RPR frame head and the value of Fe (Fairness Eligible) field, is used to encapsulate the RPR frame head.
| Ethernet priority | The grade of service | The Sc field | The Fe field | Explanation |
| 0-3 | ClassC | 00 | 1 | Fe is constant for category-B excess flow fe=1 category-A excess flow, and SC becomes 10 |
| 4，5 | ClassB | 01 | 0 | |
| 6，7 | ClassA | 11 | 0 |
Table 1 grade of service allocation table
3, search high-priority service ring option table, list structure is as shown in table 2.Finding key value is source port number, and lookup result is the ring selection result.Here use the simplest static configuration mode, fill in this table, for high priority configuring static ring is selected information by control section.Ring selection/professional classified part is searched the ring selection result that this table obtains high-priority service, if the result who searches is not that ring just abandons, the ring selection/professional classified part of control section configuration another one ring encircles from there by frame.If do not find, the operation below continuing, otherwise jumped to for the 5th step.
| Key assignments | The ring selection result | Explanation |
| Source port number | 01 or 00 | Ring on 01,00 abandons |
Table 2 high-priority service ring option table
4, search low priority traffice ring option table, list structure is as shown in table 3.Finding key value is purpose mac address, and lookup result is the ring selection result.Because the priority of c service is lower, takes to learn new address and obtain to encircle selection information with regard to the method that triggers the ring selection.Learn a new mac address from encircling, the notice control section calculates at every turn.Give the another one control section synchronously with the result then, last both writes back to the respective rings of the address entry of learning and selects the position.The rule that ring is selected can be to select to learn the information in the port of new address, another port, the topological database, the flow on the ring etc. or a plurality of factor combines.When tabling look-up, select the position decision whether to encircle from this port according to ring.When clean culture and unidirectional inundation, the ring selection result difference of two ports.During two-way inundation, Frame all encircles from two ports, and two tables are packet loss not, and different places is that TTL (timeto live) and the FI (flooding indication) in the RPR frame head that obtains from next step needs configuration accordingly.
| Key assignments | The ring selection result | Explanation |
| Destination address | 01 or 00 | Ring on 01,00 abandons |
Table 3 low priority ring option table
5, encapsulation RPR frame head.The foundation of dividing frame format is whether the source address of Ether frame is this station address, and is concrete as table 4.
Table 4 frame format is selected and packing rule
Frame head information is divided into two kinds, and a kind of is the frame head information of inundation frame, may be unidirectional inundation, also can be two-way inundation, is embodied in the ring selection information of TTL and control section configuration; Another kind is the frame head information of unicast frame.The former is some configuration parameters, and the latter need search this table with destination address in the frame head information table.Concrete operating process is as follows:
1) judges source address, the decision frame format.Source address and our station matching addresses, standard frame, otherwise be the expansion frame.
2) if standard frame is searched the frame head information table, obtain corresponding frame head information, as table 5, clean culture.Finding key value of frame head information table is the Ether frame destination address, and lookup result is some frame head information of encapsulation RPR unicast frame, and particular content sees Table 5.If search failure, inundation, the inundation information acquisition of frame head information from configuration parameter needs TTL, SO, four parameters of WE, FI.
| Key assignments | Frame head information | The unicast frame explanation | |||
| Destination address | TTL | WE | SO | FI | Ri: fixed configurations Ft: Frame is 11 Sc and Fe: obtain P, Res and Ps:0 TtlBase in the professional classification: equal TTL Ef:0 Hec:MAC hardware and insert |
Table 5 frame head information table
3) if the expansion frame, the inundation information in the configuration parameter of directly taking out is as frame head information.Wherein the destination address of RPR frame head is exactly the destination address of Ether frame, and source address is this station address, and the address of RPR frame head back is exactly the destination address and the source address of Ether frame.TTL, SO, WE, FI are identical with standard frame inundation parameter, but Ef=1, and frame format has been Duoed two Ether frame addresses than standard frame.
4) according to frame format and frame head information encapsulation RPR frame.
6, the RPR frame is delivered to the corresponding priority query of corresponding port, the different business grade is carried out bandwidth control respectively, deliver on the corresponding ring from port then with traffic shaper.Control section configuration high priority bandwidth is so that guarantee the service quality of high-priority service.Bandwidth control also will be revised the frame head that A, b service exceed the RPR of part, and concrete rule sees Table 1.
Under encircle processing procedure:
1, checks the source address of RPR frame,, abandon this frame if identical with this site address; If destination address and this site address coupling, the following ring below continuing is handled; If do not match, and be the inundation frame, the following ring below continuing is handled; If not the inundation frame, do not abandon and do not encircle down, allow frame pass through this website and continue on ring, to transmit.Receive rule as table 6.
| Condition | Row | The result | ||||
| Type | Frame type | Sign for behavior | ||||
| fi | da | sa | Following ring | Peel off | ||
| - | - | - | The source coupling | 1 | Not | Peel off |
| - | Inundation not | The purpose coupling | The source does not match | 2 | Be | Peel off |
| - | Inundation not | Clean culture does not match | The source does not match | 3 | Not | Do not peel off |
| - | Inundation not | Rich clean culture | The source does not match | 4 | Be | Do not peel off |
| - | Inundation | The purpose coupling | The source does not match | 5 | Be | Do not peel off |
| - | Inundation | Rich clean culture | The source does not match | 6 | Be | Do not peel off |
| Bridge | Inundation | Clean culture does not match | The source does not match | 7 | Not | Do not peel off |
| Bridge | Inundation | Clean culture does not match | The source does not match | 8 | Be | Do not peel off |
Table 6 bridge joint is received rule
2, the RPR frame head is peeled off.Directly the information of Ether frame is taken out, the information of RPR is peeled off from frame.Two kinds of frame formats are peeled off respectively.
3, carrying out source address study and destination address searches.If the result who searches is the port that is connected on the ring, abandon this bag, the inundation on the anti-stop ring passes to outside the ring by bridge; If do not find, be flooded to outside the ring, be convenient to encircle outer this Ether frame source address of learning.This step also will be finished other related works of 2 layers simultaneously.
4 if route also continues 3 layer functions.
5, be forwarded to corresponding ethernet port according to lookup result.
Through top processing procedure, finished the professional whole process of ring up and down, realized the professional function of ring up and down in the RPR standard, reached the purpose that realizes transparent bridge and VLAN bridge.Simultaneously can support Ethernet service directly to insert the RPR looped network in 2,3 layers of mode.
Claims (10)
1, a kind of device of realizing upper ring and lower ring of flexible gruoping ring is characterized in that, described device comprises: 2/3 layer of processing module, ring selection/classification of transaction module, frame head encapsulation/strip module, service bandwidth control module and control section;
Described 2/3 layer of processing module finished 2/3 layer of processing of Ether frame, is in first module that ring is handled on the data flow and encircles last module of handling down;
Described ring selection/classification of transaction module carries out business classification and ring is selected, in last ring is handled, be positioned at 2/3 layer of processing after, encircle and after trade-off decision is finished the frame that also needs to encircle delivered to frame head rewriting/strip module, otherwise abandon; The frame of ring all can be assigned to a grade of service on each;
Frame head rewriting/strip module is in last ring is handled, the nose heave RPR frame head of being write as of Ether frame; In ring is handled down, the RPR frame head is peeled off, form complete Ether frame;
The service bandwidth module, in last ring was handled, according to grade of service control bandwidth, A service had the highest priority, and category-B takes second place, and the C class is minimum, is to go up last module that ring is handled;
Control module is used to manage and fill in the control information of each several part.
2, device as claimed in claim 1, it is characterized in that, two RPR ports are arranged in the service bandwidth module in the described device, correspond respectively to the reception of a ring and the transmission of another ring, following ring and the data of upward encircling all will be passed through same 2/3 layer of processing module, ring selection/classification of transaction module, frame head rewriting/strip module and service bandwidth module, are used for Data Stream Processing, decision ring selection result, frame head information.
3, device as claimed in claim 1 is characterized in that, can use two described devices, and a RPR port is arranged respectively in the service bandwidth module wherein, and control section wherein can merge or nonjoinder; Two devices can be received same Ether frame simultaneously outside encircling, according to the information individual processing that control section provides, send at last on the ring, can be to have encircled ring under another RPR port from a RPR port, also can encircle from two ports simultaneously.
4, the last ring method of installing according to claim 1 is characterized in that, said method comprising the steps of:
The first step: 2/3 layer of processing, for what determine upward to encircle, then changeed for second step;
Second step: three the different grades of service of A, B, C that the grade of service of Ether frame are mapped to RPR;
The 3rd step: high-priority service is encircled selection, comprise A, b service; For determining to encircle selection result, jumped to for the 5th step, otherwise continued for the 4th step;
The 4th step: the low priority traffice ring is selected, and encircles selection according to purpose mac address, is filled in according to the flow information on the RPR port of learning this address, topological database, the ring or the combination of these information by control section; If select failure, take out the ring of acquiescence and select to be provided with;
The 5th step: carry out the frame head information processing, finish the conversion of Ether frame to the RPR frame;
The 6th step: the RPR frame is delivered to the corresponding priority level formation, and the reshaper through the different business grade carries out sending on the corresponding ring after the bandwidth control then.
5, method as claimed in claim 4 is characterized in that, the 0-3 grade of service of ethernet frame is mapped to the C grade of service of RPR in described second step, and the 4-5 grade of service is mapped to the B grade of service of RPR, and the 6-7 grade of service is mapped to the A grade of service of RPR.
6, as claim 4 or 5 described methods, it is characterized in that, the ring selection operation in described the 3rd step is according to source port or vlan information searching high-priority service ring option table, this table is filled in by control section, be used to specify the ring selection result of high-priority service, professional ring option table can adopt the static configuration method of specifying ring to select according to control information, also can adopt the Dynamic Configuration according to looped network information.
7, method as claimed in claim 4 is characterized in that, the ring in described the 4th step is selected to select two rings simultaneously, is used for two-way inundation.
8, method as claimed in claim 4 is characterized in that, the Ether frame in described the 5th step specifically comprises following processing procedure to the conversion of RPR frame:
1) judge whether source address is complementary with this station address, if the coupling would be standard frame, otherwise be the expansion frame;
2) if standard frame is searched the frame head information table, obtain corresponding frame head information; If search failure, inundation, the inundation information acquisition of frame head information from configuration parameter needs TTL, SO, four parameters of WE, FI;
3) if the expansion frame, the inundation information in the configuration parameter of directly taking out is as frame head information;
4) according to frame format and frame head information encapsulation RPR frame.
9, the following ring method of installing according to claim 1 is characterized in that, said method comprising the steps of:
The first step: peel off the RPR frame head, obtain a complete Ether frame;
Second step: the destination address that takes out the Ether frame of peeling off back formation is looked into 2 layers of table, if destination address is acquired from ring, abandons this frame, prevents to be flooded to outside the ring;
The 3rd step: carry out 2,3 layers of processing, comprise 2 layers of exchange and 3 layers of route, and source address study;
The 4th step: the result according to study is forwarded to corresponding ethernet port with Ether frame.
10, method as claimed in claim 8 is characterized in that, also comprises following processing procedure before the described first step:
Check the source address of RPR frame,, abandon this frame if identical with this site address; If destination address and this site address coupling, the following ring below continuing is handled; If do not match, and be the inundation frame, the following ring below continuing is handled; If not the inundation frame, do not abandon and do not encircle down, allow frame pass through this website and continue on ring, to transmit.
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| CNB2004100706976A CN1330148C (en) | 2004-07-29 | 2004-07-29 | Method and device for implementing upper ring and lower ring of flexible gruoping ring |
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| WO2007128178A1 (en) * | 2006-05-10 | 2007-11-15 | Huawei Technologies Co., Ltd. | A method and apparatus for separating the id unmatched message on the ring network |
| WO2007140720A1 (en) * | 2006-06-05 | 2007-12-13 | Huawei Technologies Co., Ltd. | A method and apparatus for limiting the multicasting range in prp |
| CN100433686C (en) * | 2006-05-17 | 2008-11-12 | 杭州华三通信技术有限公司 | Loop detection method and system of intersection ring in elastic group ring |
| CN100459580C (en) * | 2006-02-13 | 2009-02-04 | 杭州华三通信技术有限公司 | Method of forwarding services with three-layer resilient packet ring |
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| CN101345678B (en) * | 2008-08-27 | 2011-04-06 | 华为技术有限公司 | Multicast communication method, system and multicast communication equipment |
| CN102065005A (en) * | 2010-11-16 | 2011-05-18 | 杭州初灵信息技术股份有限公司 | Method for realizing function of sharing Ethernet of reverse bi-directional 2M ring |
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| EP1388979B1 (en) * | 2002-08-02 | 2013-07-10 | Alcatel Lucent | Method and apparatus for end-to-end connection between an RPR and an MPLS network |
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| CN101030918B (en) * | 2006-03-03 | 2010-06-02 | 华为技术有限公司 | Method, apparatus and system for supplying packet service based on IP network |
| WO2007128178A1 (en) * | 2006-05-10 | 2007-11-15 | Huawei Technologies Co., Ltd. | A method and apparatus for separating the id unmatched message on the ring network |
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| WO2007140720A1 (en) * | 2006-06-05 | 2007-12-13 | Huawei Technologies Co., Ltd. | A method and apparatus for limiting the multicasting range in prp |
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| CN101345678B (en) * | 2008-08-27 | 2011-04-06 | 华为技术有限公司 | Multicast communication method, system and multicast communication equipment |
| CN102065005A (en) * | 2010-11-16 | 2011-05-18 | 杭州初灵信息技术股份有限公司 | Method for realizing function of sharing Ethernet of reverse bi-directional 2M ring |
| CN102065005B (en) * | 2010-11-16 | 2012-08-15 | 杭州初灵信息技术股份有限公司 | Method for realizing function of sharing Ethernet of reverse bi-directional 2M ring |
| CN103428061A (en) * | 2012-05-14 | 2013-12-04 | 上海贝尔股份有限公司 | Access substrate node and method for forwarding data by using access substrate node |
| CN103428061B (en) * | 2012-05-14 | 2016-12-28 | 上海贝尔股份有限公司 | Access chassis node and the method utilizing access chassis node to carry out data forwarding |
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