CN102075374A - Method and system for reconstructing single-ring network topology - Google Patents
Method and system for reconstructing single-ring network topology Download PDFInfo
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- CN102075374A CN102075374A CN2009102287293A CN200910228729A CN102075374A CN 102075374 A CN102075374 A CN 102075374A CN 2009102287293 A CN2009102287293 A CN 2009102287293A CN 200910228729 A CN200910228729 A CN 200910228729A CN 102075374 A CN102075374 A CN 102075374A
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Abstract
The invention discloses a method and a system for reconstructing a single-ring network topology. The method comprises the following steps that: each node in a single-ring network detects whether a link connected with a root port of the node fails or not according to a predetermined time interval; when the node in the single-ring network detects that the link fails, the node with a blocked port acquires information of occurrence of link failure in the single-ring network; and the node with the blocked port converts a blocked state of the port into a data forwarding state. According to the technical scheme provided by the invention, a method for passively waiting to acquire the link failure can be converted into a method for actively detecting the link failure, and the blocked state of the port is directly converted into the data forwarding state, so that the convergence speed is increased.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of single loop network topology rebuilding method and system.
Background technology
Spanning-Tree Protocol (Spanning-Tree Protocol abbreviates STP as) is a kind of two layer protocols, finds physics loop in the network by a kind of algorithm of special use, and produces acyclic (loop-free) topological structure of a logic.The major function of Spanning-Tree Protocol comprises:
(1) keep a loop-free network, avoid network storm, if an equipment is found a loop in topology, it will block the port of one or more redundancies, make ring topology be transformed into tree topology.
(2) when network topology changes, each port that Spanning-Tree Protocol will reconfigure switch is lost or new loop occurred to avoid linking.
STP implements the schematic diagram of above two functions can be referring to Fig. 1, and Fig. 1 is based on the schematic diagram of the network topology process of reconstruction of STP agreement in the correlation technique.As shown in Figure 1, the loop network topology conversion of beginning has become tree topology, is promptly converted to the form of second accompanying drawing by first accompanying drawing among Fig. 1.As node G, when the link between the E breaks down, the process that the beginning network topology is rebuild, network topology structure has been transformed into the form of the 3rd secondary figure by second accompanying drawing.
For clear understanding STP agreement, at first introduce the notion of several keys among the STP, port is chosen in (1) root bridge, (2) root port, (3).Can be referring to Fig. 1, the root bridge is the root node of tree structure, i.e. the A of node shown in Fig. 1; Root port is to be the port that father node is transmitted Frame to root bridge direction on the nonroot bridge, has only a root port on each nonroot bridge, for example, is connected the port (R of port shown in the figure) of link in two ports of the Node B shown in Fig. 1 with node A; Choose port and be root bridge or nonroot bridge and transmit the port of data to the child node direction, for example, the another port of Node B (D of port shown in the figure).Wherein, all of the port of root bridge (node A) all is to choose port.In the STP agreement, the state of the role of each node and node middle port is elected, and election process is exactly by BPDU some parameters of each node to be compared, thereby selects the root bridge, root port and choose port.Four kinds of states of port have been stipulated in the STP agreement: blocked state (blocking), listening state (listening), learning state (learning) and forward-facing state (can claim to transmit data mode again, forwording), blocking is that blocked state can not be transmitted data, forwarding is the state that can transmit data, be transformed into the intermediateness of forwarding state during other two states from blocking, STP regulation only with root port with choose port and can transmit data, so with root port with choose port and give forwarding state, other port all is the blocking state, after the port status of each node was stable, the process that topology is set up had also just been finished.Existing standard STP agreement is followed IEEE 802.1D standard, and concrete election process is please referring to standard.Except the notion of these several keys, the STP agreement has also been stipulated the time parameter of several keys:
(1) hello time: the interval that sends standard BPDU (Bridge Protocol DataUnit abbreviates BPDU as) message;
(2) forward delay: forward delay, STP agreement have been stipulated four kinds of state: blocking, listening, learning and forwording of port.Forwarding delay is the duration of listening or learning state.Default value is 15s.
(3) max age: maximum keep alive cycle, the maximum effective time of BPDU message.Default value is 20s.
STP uses above-mentioned time parameter, the transmission of control criterion BPDU message, and when the conversion of state and judgement carry out the reconstruction of topology.
The outstanding problem of standard STP agreement is that convergence time is long when topology changes.According to the STP agreement, the topology rebuilding flow process is as follows: suppose to have now the bridge of three operation stp agreements, they connect into looped network as shown in Figure 2, and after election process was finished, the P1 port of bridge C became the blocking state.If connect the link occurs fault of A and C, then the P2 port of C does not receive standard bpdu message, causes the standard bpdu message stores time of P2 port to surpass maxage, the bridge C process that conducts an election again.At this moment, P1 will be elected as designated port according to the STP agreement, and like this, P1 will become the forwarding state from the blocking state exchange, according to state transition graph as shown in Figure 3, will experience the time of two forwarding delay around here.As seen according to standard STP agreement, calculate the time that topology rebuilding needs 50s at most by default value.
By as can be known: no matter the character of STP agreement has determined how complicated or simple network topology structure is, and the decisive factor of topology rebuilding speed comprises several time parameters, rather than election process to the analysis of STP agreement.In fact, the state that each port in the network on each bridge is re-elected oneself is very rapidly, and the most of the time has been used in fact and has found on the state exchange of network topology change and port.And the quantity of node and network topology are associated in the selection of these time parameters and the network, reduce above-mentioned time parameter again and again and may cause network topology can not stablize foundation, and the potentiality that reduce above-mentioned time parameter simultaneously also are limited.The standard STP protocol convergence time, long main cause was: the characteristic of passive wait.For example, bridge has been used the very short time just to know after certain original port that blocks enters forwarding state in the listening stage and can not produced loop, can't can enter learning state immediately, needs to wait for 15 seconds the expired learning state that enters of forward delay time; If the port of bridge just learns to be over all MAC Address at learning phase through the very short time, also can't enter forwarding state immediately, because the forward delay that it also will wait for 15 seconds.
Summary of the invention
When rebuilding based on the network topology of STP in the correlation technique, the problem that convergence rate is slower and propose the present invention, for this reason, main purpose of the present invention is to provide a kind of improved network topology method for reconstructing and system, one of to address the above problem at least.
According to an aspect of the present invention, provide a kind of single loop network topology rebuilding method.
Single loop network topology rebuilding method according to the present invention comprises: whether each node detects at interval the link that is connected with this node root port to schedule and lost efficacy in the single loop network; When a node detection in the single loop network arrived link failure, the node with port blocked was known the information that link failure takes place in the single loop network; Node with port blocked becomes to transmit data mode with the state exchange that it is in the port of blocked state.
According to a further aspect in the invention, provide a kind of single loop network topology rebuilding system.
Comprise a plurality of nodes according to single loop network topology rebuilding of the present invention system, comprise a node in a plurality of nodes with port blocked, wherein, whether above-mentioned a plurality of nodes are used for detecting the link that is connected with this node root port to schedule at interval and lost efficacy; Node with port blocked is used for knowing the information that link failure takes place in the single loop network when a node detection of single loop network arrives link failure, and its state exchange that is in the port of blocked state is become to transmit data mode.
By the present invention, whether each the node active detecting in the single loop network lost efficacy with the link that this node root port is connected; When a node detection in this single loop network arrived link failure, the node with port blocked was known the information that link failure takes place in the single loop network; Node with port blocked becomes to transmit data mode with the state exchange that it is in the port of blocked state, solved in the correlation technique when rebuilding based on the network topology of STP, the problem that convergence rate is slower, and then passive wait can be known link failure changes the active detecting link failure into, and the state that makes the port of blocked state is directly changed into the forwarding data mode, thereby accelerated convergence rate.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is based on the schematic diagram of the network topology process of reconstruction of STP agreement in the correlation technique;
Fig. 2 is the single loop network schematic diagram that comprises 3 nodes;
Fig. 3 is the stp state transition diagram of node port;
Fig. 4 is the flow chart according to the single loop network topology rebuilding method of the embodiment of the invention;
Fig. 5 is the flow chart of single loop network topology rebuilding method according to the preferred embodiment of the invention;
Fig. 6 is the structural representation according to the single loop network topology rebuilding system of the embodiment of the invention;
Fig. 7 is the functional block diagram of the node in the single loop network according to the preferred embodiment of the invention;
Fig. 8 is the structural representation of single loop network topology rebuilding system according to the preferred embodiment of the invention.
Embodiment
Functional overview
The embodiment of the invention provides a kind of single loop network topology rebuilding scheme, and for Single-ring network, each node only has two ports.The most of the time of rebuilding at stp topology has been used in this characteristic on the state exchange of finding network topology change and port in fact, goes out following optimization direction in conjunction with the characteristic analysis of Single-ring network:
(1) change when topology, new configuration messages will just can propagate into whole network through certain time delay, and this time delay is called Forward Delay, and the agreement default value is 15 seconds.Receive at all bridges before the message of this variation, do not find that also oneself should stop forwarding, and then may exist temporary loop in new topology if be in the port of forwarding in the old topological structure.In order to solve the problem of temporary loop, generate tree and used a kind of timer strategy, promptly in the middle of port is from the blocked state to the forwarding state, add the intermediateness of only learning MAC Address but not participating in transmitting, i.e. a learning state.Be not have this problem under single loop conditions, so the learning state can be skipped.
(2) after the link failure, the time of 20s can find that just link changes to STP needs etc. at most.If can when link breaks down, find at once, and force to enter the change in topology handling process, thereby can save the reconstruction time of maximum 20s.
(3) owing to be Single-ring network, have only a node that the port of blocking state is arranged in the system, if the outgoing link fault, then the blocking port is the unique channel that the node that links to each other with it leads to root node.So when detecting link failure, directly the port translation with the blocking state becomes forwarding, skips listening and learning (not had the learning state after the optimization) state.
Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Method embodiment
According to the embodiment of the invention, at first provide a kind of single loop network topology rebuilding method.
Fig. 4 is the flow chart according to the single loop network topology rebuilding method of the embodiment of the invention.As shown in Figure 4, the single loop network topology rebuilding method according to the embodiment of the invention comprises following processing (step S401-step S405):
Step S401: whether each node detects at interval the link that is connected with this node root port to schedule and lost efficacy in the single loop network;
According to standard STP agreement, when link occurs fault, the BPDU message that can only be passive needs to wait for root port arrives max Age and expired, after this just change in topology information can be propagated to root bridge direction.
Preferably, technical scheme provided by the invention can the active detecting root port Link State, when the root port of certain bridge (for example detects link failure, detect handshake etc.) after, on realizing, software makes on one's own initiative that the expired timer of control BPDU---max age timer is expired, message is taken place topology transmit to whole topological structure.Wherein, the mode of active detecting includes but not limited to: detect with Preset Time, Preset Time can be provided with according to the actual requirements.
Step S403: when a node detection in the single loop network arrived link failure, the node with port blocked was known the information that link failure takes place in the single loop network;
Preferably, if the link that links to each other with the root port of the node with port blocked breaks down, then this node active detecting is to the link failure that is connected with this node root port.
Preferably, if the link that links to each other with the root port of the node with unblock port breaks down, the node detection that then has the unblock port is to the link failure that is connected with this node root port; Afterwards, the node with unblock port transmits self-defining BPDU message has port blocked until arrival node by the port of choosing of re-electing to next node; Node with port blocked receives BPDU message, obtains the information of link failure in the network.
Wherein, above-mentioned self-defining BPDU message has different types with the BPDU message of standard.For example, the field that can identify type in BPDU message is changed.
Step S405: the node with port blocked becomes to transmit data mode with the state exchange that it is in the port of blocked state.
Owing to be Single-ring network, have only a bridge that the port of blocking state is arranged in the system, if link failure, then the blocking port is the unique channel of leading to Root Bridge.So when detecting link failure, directly the port translation with the blocking state becomes the forwarding state, and the state of other ports is constant.
When a certain port detects change in topology, for with change in topology message fast notification to the bridge that the blocking status port is arranged, according to technical scheme provided by the invention, the BPDU message (self-defining BPDU message) that has increased a kind of non-standard type is transmitted change in topology message.The type field of this kind BPDU is different from configuration bpdu and TCN BPDU gets final product, after some nodes are found link failure, if this node does not have the port of blocking state, the BPDU that port sends non-standard type that chooses by this node then, after other node receives the BPDU of this type, also its max age timer expiry can be repeated this process, until the node that the blocking status port is arranged.
Preferably,, need to add new node,, when the port of this node is in blocked state, make the state of port be converted to forward-facing state via listening state for the node that needs in the single loop network to increase if when rebuilding topology.Promptly skip learning state,, can reduce the 15S time according to the STP agreement.
Fig. 5 is the flow chart of single loop network topology rebuilding method according to the preferred embodiment of the invention.As shown in Figure 5, the single loop network topology rebuilding method comprises following processing (step S501-step S519) according to the preferred embodiment of the invention:
Step S501: a node detection breaks down to link in the single loop network, and perhaps this node receives off-gauge BPDU (self-defining BPDU) message, and wherein, this node does not have port blocked;
Step S503: this node makes max age timer expiry, then enters max age timer expiry handling process;
Step S505: the BPDU message (frame) that sends non-standard type;
Step S507: port is appointed as chooses port;
Step S509: carry out the root port election again;
Step S511: choose the port election again;
Step S513: this node judges whether to have the port of blocking state, if, execution in step S515 then, otherwise, execution in step S519;
Preferably, if this node does not have the port of blocking state, the BPDU message that port sends non-standard type of choosing by this node then, after other node receives the BPDU of this type, also can be with its max age timer expiry, repeat this process, until the node that the blocking status port is arranged.
Step S515: the node with port blocked converts its state (blocking state) that is in the port of blocked state to transmits data mode (forwarding state).
Step S517: the node with port blocked continues to send TCN message to next node, and wherein, this message is used for the information that other node links of informing network lost efficacy;
Step S519: the node with unblock port carries out the distribution of port status.
Pass through the foregoing description, a kind of single loop network topology rebuilding method is provided, in the network topology process of reconstruction, by each node detection link failure initiatively, then on one's own initiative to Internet communication change in topology information, last change initiatively port status, in specific implementation process, the use PPC that in dominant frequency is 200MHz uses this scheme as CPU and Linux on as the bridge of operating system, and the speed that network topology is rebuild is about the second level.Thereby as can be known in single loop network topology rebuilding process, use this scheme, and can effectively shorten the time of topology rebuilding, accelerate STP convergence speed.
System embodiment
According to the embodiment of the invention, also provide a kind of single loop network topology rebuilding system.
Fig. 6 is the structural representation according to the single loop network topology rebuilding system of the embodiment of the invention; Fig. 7 is the functional block diagram of the node in the single loop network according to the preferred embodiment of the invention; Fig. 8 is the structural representation of single loop network topology rebuilding system according to the preferred embodiment of the invention.
As shown in Figure 6, single loop network topology rebuilding system according to the embodiment of the invention comprises: a plurality of nodes (shown in the figure be example with five nodes: node A, Node B, node C, node G, node E), wherein, these a plurality of nodes comprise a node (node G) with port blocked, and other nodes are the node with unblock port.Be described below in conjunction with Fig. 7, Fig. 8.
Wherein, whether above-mentioned a plurality of nodes are used for detecting the link that is connected with this node root port to schedule at interval and lost efficacy;
The node with port blocked in a plurality of nodes is used for knowing the information that link failure takes place in the single loop network when a node detection of single loop network arrives link failure, and its state exchange that is in the port of blocked state is become to transmit data mode.
Preferably, as shown in Figure 7, the node that has port blocked in the single loop network can comprise according to function: whether first detecting unit 1 is used to detect the link that is connected with its root port and lost efficacy.
Preferably, as shown in Figure 7, above-mentioned node with unblock port is divided and can be comprised according to function: second detecting unit 2, transmitting element 3.Wherein, whether second detecting unit 2 is used to detect the link that is connected with its root port and lost efficacy; Transmitting element 3 is used for transmitting self-defining BPDU message by the port of choosing of re-electing to next node.
Preferably, as shown in Figure 7, the node that has port blocked in the single loop network is divided and can also be comprised according to function: receiving element 4, be used to receive self-defining BPDU message, and wherein, this self-defining BPDU message is sent by the node with unblock port.
Preferably, as shown in Figure 8, a plurality of nodes in the above-mentioned single loop network topology rebuilding system: be used for when the port status of the arbitrary node of described a plurality of nodes takes place to change, making state directly be converted to forward-facing state through listening state by blocked state.
For example, as shown in Figure 8, a kind of situation of transformation takes place for the node port state, need in single loop network, increase one or more nodes and (there is shown one: node F), when the port status of node F took place to change, state directly was converted to forward-facing state by blocked state through listening state.
Pass through the foregoing description, a kind of single loop network topology rebuilding system is provided, the node that this system comprises with port blocked, and node with unblock port, by each node detection link failure initiatively, then initiatively to Internet communication change in topology information, last change initiatively port status, can shorten time of topology rebuilding greatly.
In sum, pass through the above embodiment of the present invention, the single loop network topology rebuilding scheme that provides, when network topology is rebuild, detect link failure at first on one's own initiative, then on one's own initiative to Internet communication change in topology information, change port status at last on one's own initiative, solved in the correlation technique when rebuilding based on the network topology of STP, the problem that convergence rate is slower, and then passive wait can be known link failure changes the active detecting link failure into, and make the state of the port of blocked state be directly changed into the forwarding data mode, the time of topology rebuilding can be shortened greatly, thereby convergence rate can be accelerated.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a single loop network topology rebuilding method is characterized in that, comprising:
Whether each node detects at interval the link that is connected with this node root port to schedule and lost efficacy in the single loop network;
When a node detection in the described single loop network arrived link failure, the node with port blocked was known the information that link failure takes place in the described single loop network;
Described node with port blocked becomes to transmit data mode with the state exchange that it is in the port of blocked state.
2. method according to claim 1 is characterized in that, the node with port blocked knows that the information that link failure takes place in the described single loop network comprises:
Described node with port blocked is known the link failure that is connected with this node root port by detection.
3. method according to claim 1 is characterized in that, the node with port blocked knows that the information that link failure takes place in the described single loop network comprises:
Node with unblock port is known the link failure that is connected with this node root port by detection;
Described node with unblock port transmits self-defining Bridge Protocol Data Unit BPDU message until arriving described node with port blocked by choosing port to next node;
Described node with port blocked receives described BPDU message, obtains the information of link failure in the network.
4. method according to claim 3 is characterized in that, the field of the sign type that the BPDU message of described self-defining BPDU message and standard comprises is inequality.
5. according to each described method in the claim 1 to 4, it is characterized in that described method also comprises:
For the arbitrary node in the described single loop network, when the port status of this node took place to change, the state-transition process was for directly to be converted to forward-facing state by blocked state via listening state.
6. single loop network topology rebuilding system, wherein, described system comprises a plurality of nodes, described a plurality of nodes comprise a node with port blocked, it is characterized in that,
Whether described a plurality of node is used for detecting the link that is connected with this node root port to schedule at interval and lost efficacy;
Described node with port blocked is used for knowing the information that link failure takes place in the described single loop network when a node detection of described single loop network arrives link failure, and its state exchange that is in the port of blocked state is become to transmit data mode.
7. system according to claim 6 is characterized in that, described node with port blocked comprises:
Whether first detecting unit is used to detect the link that is connected with its root port and lost efficacy.
8. system according to claim 6 is characterized in that,
The node that has the unblock state in described a plurality of node comprises:
Whether second detecting unit is used to detect the link that is connected with its root port and lost efficacy;
Transmitting element is used for transmitting self-defining Bridge Protocol Data Unit BPDU message by the port of choosing of re-electing to next node;
Described node with port blocked also comprises:
Receiving element is used to receive described self-defining BPDU message.
9. according to each described system in the claim 6 to 8, it is characterized in that,
Described a plurality of node is used for making state directly be converted to forward-facing state by blocked state through listening state when the port status of the arbitrary node of described a plurality of nodes takes place to change.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102571520A (en) * | 2011-12-31 | 2012-07-11 | 北京格林伟迪科技有限公司 | Method for realizing rapid convergence in looped network |
| CN108512751A (en) * | 2017-02-28 | 2018-09-07 | 华为技术有限公司 | A kind of port status processing method and the network equipment |
| CN109981365A (en) * | 2019-03-26 | 2019-07-05 | 深圳市科力锐科技有限公司 | Data decryptor method, apparatus, user equipment and storage medium |
| CN113068167A (en) * | 2021-03-17 | 2021-07-02 | 上海物骐微电子有限公司 | High-reliability Bluetooth data transmission system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102571520A (en) * | 2011-12-31 | 2012-07-11 | 北京格林伟迪科技有限公司 | Method for realizing rapid convergence in looped network |
| CN102571520B (en) * | 2011-12-31 | 2015-10-28 | 北京格林伟迪科技有限公司 | A kind of method realizing Fast Convergent in looped network |
| CN108512751A (en) * | 2017-02-28 | 2018-09-07 | 华为技术有限公司 | A kind of port status processing method and the network equipment |
| CN108512751B (en) * | 2017-02-28 | 2021-02-23 | 华为技术有限公司 | Port state processing method and network equipment |
| CN109981365A (en) * | 2019-03-26 | 2019-07-05 | 深圳市科力锐科技有限公司 | Data decryptor method, apparatus, user equipment and storage medium |
| CN113068167A (en) * | 2021-03-17 | 2021-07-02 | 上海物骐微电子有限公司 | High-reliability Bluetooth data transmission system and method |
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Application publication date: 20110525 |