CN101123550A - Function change by topology upon change to area root information - Google Patents
Function change by topology upon change to area root information Download PDFInfo
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- CN101123550A CN101123550A CNA2006101157231A CN200610115723A CN101123550A CN 101123550 A CN101123550 A CN 101123550A CN A2006101157231 A CNA2006101157231 A CN A2006101157231A CN 200610115723 A CN200610115723 A CN 200610115723A CN 101123550 A CN101123550 A CN 101123550A
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Abstract
A method of changing the functionality of topology in a local area network (LAN) includes multiple operations. One operation is executed to determine that the main port of Multiple Spanning Tree Instance (MSTI) on a bridge in the local area network (LAN) is changed from a corresponding Common Internal Spanning Tree Instance (CSTI) root port state to a retransmission state, and one operation is executed to change the port transmission state machine of the bridge from an idle state to a transmission state so that the main port of MSTI can send a topology changing (TC) BPDU message. The execution of the operation changing the port transmission state machine responds to the execution of the operation determining that the main port of Multiple Spanning Tree Instance (MSTI) is changed into the retransmission state.
Description
The cross reference of related application
Present patent application require on August 11st, 2005 submit to be entitled as " 802.1s MSTITopology Change When Regional Root Information Changes ", sequence number is 60/707, the priority of 513 common unsettled U.S. Provisional Patent Application comprises its full content in this mode by reference.
Technical field
The execution of Multiple Spanning Tree Protocol in the disclosure relate generally to Local Area Network that this makes, and relate more particularly to when area root information in LAN changes, promote the topology change of 802.1s Multiple Spanning Tree Instance.
Background technology
Layer 2 (L2) equipment of OSI(Open Systems Interconnection) reference model is called " bridge " or " switch " and is controlled by proprietary standardized L2 agreement (IEEE) and L3 (layer 3) agreement (IETF).Multiple Spanning Tree Protocol (MSTP) aims to provide complete connectedness, prevents in whole Bridged Local Area Network (LAN) any loop of not expecting for the frame of distributing to any given VLAN simultaneously.This LAN comprises the bridge of any interconnection, and each bridge moves the Spanning-Tree Protocol of a kind of respective type or multiple respective type.The example of the Spanning-Tree Protocol of these types is including but not limited to Spanning-Tree Protocol (STP), RSTP (RSTP) and Multiple Spanning Tree Protocol (MSTP).STP is the conventional agreement according to IEEE 802.1D 1998 standards.RSTP is according to IEEE 802.1D 2004 standards.MSTP is according to IEEE802.1Q 2005 standards.
One of avoiding loop is the most important task of Spanning-Tree Protocol, or most important a plurality of tasks of Spanning-Tree Protocol.Loop is meant a kind of network problem, wherein continues with undying circulation data to be divided into groups to carry out route between bridge, rather than makes it arrive its intended purposes ground.When loop took place, transmitting to become very chaotic rapidly and become via the information of affected one or more bridges needed to handle resource (for example, CPU resource).
MSTP is the implementation to the Virtual Local Area Network sensitivity of Spanning-Tree Protocol, thereby makes the frame of distributing to different VLAN to go along different paths.In the MSTI zone of being made up of LAN and/or multiple spanning tree (MSTI) bridge, every paths is based on Multiple Spanning Tree Instance (MSTI) independently.These zones and formation bridge (constituent Bridge) and/or LAN are connected in the single Common Spanning Tree (CST).Term " example " is meant the tree of the reality that does not have loop of the one group of VLAN that is handled by one group of MSTP state machine.The user can define a plurality of MSTI, and any VLAN can be mapped to any MSTI.
Internal Spanning Tree (IST) example is in the operation of MSTP intra-zone, with topological at all VLAN definition that are mapped to this common example.This has just expanded CST, but at the intra-zone relative with region exterior.Ist instance is present in the zone of topology all the time.MSTI can not expand to outside this zone fully in the intra-zone operation equally.
The CST example is to connect all 802.1s zones not move the unique and enforceable example of the bridge (that is those bridges of the plaintext of the STP of operation such as 802.1D-2004) of 802.1s with all.In fact, the CST example is regarded each zone as a virtual bridge.Therefore, for the purpose of all practices, the combination results CIST of IST and CST (that is, the functional IST and the CST of combination).
Generating tree calculates (that is, effect and state computation) and makes it possible to each port assignment effect (for example, root, master, appointment, substitute, backup or forbidding) and state (for example, learn, transmit or abandon) into bridge in the network.According to state machine, distributional effects and the state in MSTP standard (that is IEEE 802.1Q2005 standard), described.The MSTP regulation " ... on boundary port, the Multiple Spanning Tree Instance effect must be continued to use Common and Internal Spanning Tree (CIST) effect ... ".In 802.1Q 2005 the 13.13rd section (stable connectedness), CIST and related effect thereof are defined as:, in the same way the frame of distributing to CIST and MSTI is transmitted or in the same way it does not transmitted at the boundary port place.If this is because the boundary port information distribution makes that the CIST port information is root port (Root Port), then the MSTI port information will be master port (Master Port), if and the CIST port information is designated ends mouth (Designated Port), substitutes port (Alternate Port), backup port (Backup Port) or disabled ports (Disabled Port) that then the port information of each MSTI will be identical.At this port information is defined as and comprises port effect information (for example, port effect) and port status information (for example, current state).
The problem that discloses in newest standards 802.1Q 2005 is as follows: when some information change on boundary port and cause that previous alternative state becomes " root forwarding " (RootForwarding) time, changing with the exchange that can not take place again at the identical moment in the moment of CIST at MSTI, promptly replace with " the main forwarding " (Master Forwarding), reason is that MSTI must wait for, till propose/agree to shake hands abandoning on the port of appointment (Proposal/Agreement handshake).In other words, can be expressly that the CIST on boundary port and MSTI state are carried out slight releasing is synchronous so that can take the problem of the known 802.1Q 2003 transient state loops on MSTI into account.Therefore, although new CIST root port may be for " forwarding " (Forwading) and enter the topology change consistent (TC) with state machine, but new master port still may be dropped and according to up-to-date deployment file, to wait for that till producing CIST proposal/agreement sequence on the former CIST root port reason is that this new master port appointment abandons.Therefore, in case the MSTI master port becomes " forwarding ", bridge should still must enter new topology change, and reason is that up-to-date CIST root port and MSTI master port becomes " forwarding " no longer simultaneously.
If when the MSTI master port becomes " forwarding ", bridge does not enter topology change at once, then can occur not the situation at the connection of this MSTI business in the bridge network, reason is not refresh (flushing) for this MSTI in for " forwarding " at new master port.Therefore, be used for the old information that business is carried out bridge joint is kept and can be corresponding to the path that can not re-use.Worse situation is not connection in 2 seconds, and these 2 seconds is the required time of hello BPDU (BPDU) that sends transmission TC.
As if although the situation of transient state loop has been solved in 802.1Q 2005 standards, the solution of being put down in writing has caused the corresponding situation do not expected.More specifically, when the MSTI master port becomes " forwarding ", be not used for business is carried out the refreshing of source learning table (SourceLearning table) of bridge joint.This is that it prevents that master port from sending any BPDU because there is the test of port transmit state machine at present.What do not expect is, after being used for the action that the source learning table is refreshed that business is carried out bridge joint occurred in about 2 seconds, or worse situation, promptly occurs in when sending corresponding hello BPDU.Therefore, when area root information changes, it will be favourable, desired with useful promoting topology change functional in the mode that overcomes the shortcoming that is associated with the conventional method that is used to promote topology change.
Summary of the invention
Embodiments of the invention are used for improving the connectivity that is provided by bridge at the Local Area Network that utilizes Multiple Spanning Tree Protocol (MSTP) configuration.More specifically, embodiments of the invention have reduced to change " forwarding " state and MSTI master port at the Multiple Spanning Tree Instance on the bridge (MSTI) master port significantly and have sent duration between topology change BPDU (BPDU) message.Thus, embodiments of the invention have advantageously overcome the one or more shortcomings that are associated with the conventional aspect of the MSTP of the bridge of realizing LAN.
In one embodiment of the invention, a kind of being used for provides the functional method of topology change to comprise a plurality of operations at Local Area Network.Carry out a kind of operation and be used to determine that Multiple Spanning Tree Instance (MSTI) master port on the bridge of LAN is " forwardings " state from corresponding public Internal Spanning Tree example (CSTI) root port state-transition, and carry out a kind of operation and be used for the port transmit state machine of bridge is sent " transmission " state of topology change (TC) BPDU message from " free time " state-transition for being used for realization from the MSTI master port.This operation that the port transmit state machine is changed changes the operation of " forwarding " state in response to definite Multiple Spanning Tree Instance (MSTI) master port of execution and carries out.
In another embodiment of the present invention, a kind of being used for provides the functional method of topology change to comprise a plurality of operations at Local Area Network.Carry out a kind of operation and be used for the generation of identification incident on the bridge of LAN.This incident comprises that carrying out area root information changes.Carrying out a kind of operation is used for removing corresponding public Internal Spanning Tree example (CSTI) root port state synchronization on Multiple Spanning Tree Instance (MSTI) master port state and the bridge in response to the generation of this incident of identification.Carry out a kind of operation and be used for determining when the MSTI master port is " forwarding " state from corresponding C STI root port state-transition.Carrying out a kind of operation is used to make the port transmit state machine of bridge to send " transmission " state of topology change (TC) BPDU from " free time " state-transition from the MSTI master port for being used for realization.Make operation that the port transmit state machine changes in response to being used for determining when the MSTI master port changes the operation of " forwarding " state into and carry out.Carrying out a kind of operation is used for being used to make the port transmit state machine to change the operation of " transmission " state into and send topology change (TC) BPDU message from the MSTI master port in response to execution.
In another embodiment of the present invention, a kind of OSI(Open Systems Interconnection) layer 2 network equipment comprise a plurality of operations that can be read by the data processing equipment of layer 2 network equipment.Provide instruction to be used to determine that Multiple Spanning Tree Instance (MSTI) master port on the bridge of LAN is " forwarding " state from corresponding public Internal Spanning Tree example (CSTI) root port state-transition, and provide instruction to be used for the port transmit state machine of bridge is sent " transmission " state of topology change (TC) BPDU message from " free time " state-transition for being used for realization from the MSTI master port.The transmit state machine of bridge is changed into " forwarding " state and carries out for " transmission " state is in response to definite Multiple Spanning Tree Instance (MSTI) master port from this state-transition.
Turn to particular aspects of the present invention now, in at least one embodiment, carrying out a kind of operation is used in response to the port transmit state machine of bridge is sent topology change (TC) BPDU message for " transmission " state from the MSTI master port from " free time " state-transition.
In at least one embodiment of the present invention, carry out a kind of operation and be used to remove corresponding public Internal Spanning Tree example (CSTI) root port state synchronization on Multiple Spanning Tree Instance (MSTI) master port state and the bridge.
In at least one embodiment of the present invention, before definite Multiple Spanning Tree Instance (MSTI) master port changes " forwarding " state into, carry out synchronous to the releasing of MSTI master port state.
In at least one embodiment of the present invention, determine that Multiple Spanning Tree Instance (MSTI) master port changes " forwarding " state into and comprises definite sequence completing successfully on the MSTI master port of proposing to agree.
In at least one embodiment of the present invention, execution is synchronous to the releasing of MSTI master port state before initialization is proposed to agree sequence.
In at least one embodiment of the present invention, carrying out a kind of operation is used in response to the port transmit state machine of bridge is sent topology change (TC) BPDU message for " transmission " state from the MSTI master port from " free time " state-transition.
By the following specification of further reading, relevant drawings and appending claims, these and other purpose of the present invention, embodiment, advantage and/or feature will become quite obvious.
Description of drawings
Fig. 1 is that expression has a plurality of zones and have the block diagram of the Local Area Network of at least one bridge in each zone.
Fig. 2 is that expression is according to a kind of flow chart that is used for providing at LAN the embodiment of the functional method of topology change of the present invention.
Embodiment
Realizing in the Multiple Spanning Tree Protocol (MSTP) that according to IEEE 802.1Q 2003 standards Multiple Spanning Tree Instance (MSTI) allows to take place the transient state loop.The transient state loop means loop took place during blink, is generally this blink and transmits back and forth between two or more bridges the required time of spanning-tree information.Known when boundary port information in the Local Area Network topology at all LAN as shown in Figure 1 and so on changes, the transient state loop can take place.Although in the 802.1Q standard, proposed solution, from this solution, produced other problem to the transient state loop.
The above-mentioned solution that is used to solve the transient state loop comprises removes the MSTI master port its corresponding public Internal Spanning Tree example of state (CSTI) root port state synchronization.More specifically, take place therein on the bridge of effect of event boundaries port and state re-computation, nearest MSTI master port still can for " abandoning " (Discarding), and requirement according to up-to-date deployment file, to wait for that the CSTI root port before this is designated as " abandoning " now till CSTI proposal/agreement sequence takes place on the former CSTI root port.At such waiting time, may become " forwarding " of appointment and enter the topology change consistent with state machine corresponding to the CSTI root port of the nearest appointment of the MSTI master port of appointment recently.Therefore, in case the MSTI master port becomes appointment " forwarding ", then still must enter new topology change state, reason is that up-to-date CSTI root port and MSTI master port can not become appointment " forwarding " simultaneously.If the MSTI master port does not enter the topology change state afterwards immediately in " forwarding " that the MSTI master port becomes appointment, then owing to not refreshing, therefore the situation of connection can appear not having in LAN when new port needles is transmitted MSTI.Therefore, be used for the outdated information that bridge joint is carried out in Network is kept and can be corresponding to the network path that can not re-use.Worse situation is not connection in about 2 seconds, and these 2 seconds is the required time of hello BPDU message that sends transmission CSTI TC BPDU message.
Fig. 1 represents a LAN, and it has the topology of topology change (TC) problem that wherein occurs in this discussion.Those skilled in the art will appreciate that this is wherein to occur in TC problem a plurality of of this a discussion topology in may topologys.Almost any topological scene of the master port of the nearest selection in any MSTI that causes all will cause same TC problem usually.
LAN among Fig. 1 has 3 bridges.Bridge 1 belongs to the zone 1 of LAN.Bridge 3 and bridge 4 belong to the zone 2 of LAN.The port one of bridge 1 is connected to the port 2 of bridge 3.The port one of bridge 3 is connected to the port 2 of bridge 4.The port one of bridge 4 is connected to the port 2 of bridge 1.The port one of the port 2 of bridge 1, the port 2 of bridge 3 and bridge 4 is the boundary port of respective bridge.Two spanning-tree instances of configuration on each bridge of LAN.First example is public Internal Spanning Tree example or " CSTI ", and second example is Multiple Spanning Tree Instance (MSTI).This MSTI be used for MSTP first example (that is, MSTI1).
The problem of TC as in this discussion that turns to discussion to take place on the bridge of LAN now is according to the outside port path cost is occurred on the port one of bridge 4 from default value (as stipulating the 802.1s standard) becomes minimum possible value (as stipulating) in the 802.1s standard the incident that standard allowed.After this incident takes place, be the effect of " root forwarding " from the role transformation that substitutes at the port one (be the boundary port of network 4) of the bridge 4 of CSTI.Because synchronous variable is not set on port 2, therefore the port one (for the boundary port of network 4) at the bridge 4 of MSTI1 is " master abandons " effect (MasterDiscarding) from the role transformation that substitutes.Therefore, according to up-to-date 802.1Q 2005 standards, all synchronous functions are not set yet.Be right after at the port one of the bridge 4 of CSTI from the role transformation that substitutes for " root forwardings " afterwards, 1 transmission of bridge 4 CIST root ports is about the TC BPDU message of CSTI.Bridge 4 MSTI master ports 1 are waited in " forwardings " that it can change appointment into proposal on the bridge 4 CIST ports 2 before and are agreed the sequence generation.Yet when this transformation on bridge 4 MSTI master ports 1 takes place, because the configuration of the routine of port transmit state machine, bridge 4 MSTI master ports 1 will can not send any TC BPDU message before the Hello timer expiration.
Remove the problem that its corresponding CSTI root port of MSTI master port state state synchronization can solve the transient state loop usually.Yet when the MSTI master port became " forwarding ", the refreshing fully of source learning table that is used for business is carried out bridge joint do not taken place, and reason is to test in the present port transmit state machine, and it prevents that master port from sending any BPDU message.The action that refreshes is up to just taking place after about 2 seconds at most, and worse situation is, takes place when transmission HelloBPDU message, and this causes the problem at the TC of this discussion.
According to the present invention, need not such test and solve the TC problem by allowing any MSTI to send BPDU message equally.On the current time, got rid of this BPDU message function in the port transmit state machine by MSTP.The present invention has advantageously revised and has been used to provide this functional port transmit state machine.
Two kinds of methods that are used for this modification in this discussion.According to the present invention, first illustrative methods is that same the permission sends TC BPDU message via each MSTI when each MSTI master port becomes " forwarding ".Another possible illustrative methods is not allow to send a TC BPDU message (unless not disposing MSTI on this port) via CIST when root port becomes " forwarding ", and waits for before sending an independent corresponding TC BPDU message till all MSTI change " the main forwarding " state into.
What discuss now is the specific implementation of this solution that TC BPDU message according to the present invention is transmitted.It should be understood that to exist several different methods to revise state machine, transmit to solve according to TC BPDU message of the present invention.By means of in this disclosure of carrying out, those skilled in the art it is contemplated that additive method revises state machine to solve according to TC BPDU message of the present invention transmission.
Whether in order to be " TRANSMIT_RSTP " state from " free time " state-transition in the port transmit state machine, must avoid when assessment newInfoMsti the notice port is that the variable or the function of master port tested.Avoid this test to make that master port sends TC BPDU message immediately when master port becomes " forwarding " of appointment.Be used to promote an example of the false code of this test to be according to current deployment file 802.1Q 2005:
sendRSTP&&(newInfo‖(newInfoMsti&&！mstiMasterPort))&&(txCount＜txholdCount)&&(hellowhen！＝0).
In one embodiment, this test is made amendment so that can propagation function according to TCBPDU message of the present invention, the result is as follows:
sendRSTP&&(newInfo‖newInfoMsti)&&(txCount＜txholdCount)&&(hellowhen！＝0).
Disclosed hereinly be, in this false code of this proposition only as a example that may solution according to the present invention.In the file in any future, term, name variable, function name and/or state machine can change.Thereby specific implementation of the present invention depends on the particular aspects of given MSTP standard at least in part.
Fig. 2 explanation provides TC functional method according to of the present invention being used at LAN (for example LAN of Fig. 1), is called method 100 at this.Method 100 starts from operating 102, is used to be identified in the generation of the incident on the bridge that need carry out the LAN that boundary port information changes.In response to the generation of this incident of identification, executable operations 104 is used to carry out the corresponding C STI root port state synchronization of removing on MSTI master port state and the bridge.Afterwards, executable operations 106 is used for determining when the MSTI master port is " forwarding " state from corresponding C STI root port state-transition.In one embodiment, determine when the MSTI master port changes " forwarding " state into preferably but not necessarily comprise and determine to propose agree sequence completing successfully on the MSTI master port.When changed forwarding state in response to definite MSTI master port, executable operations 108 is used for the port transmit state machine of bridge is " transmission " state from " free time " state-transition.This transformation of port transmit state machine can make sends topology change (TC) BPDU from the MSTI master port.Executable operations 112 is used for sending TC BPDU message in response to the port transmit state machine changes " transmission " state into from the MSTI master port.As disclosed in this, TC according to the present invention functional can easily realize and provide the convergence again that allows 500ms almost or even still less the standard MSTP of convergence again realize.
36According to the present invention, configuration osi layer 2 network equipments are used to provide that TC is functional as disclosed in this.For this reason, be used to carry out the functional instruction of this TC and dispose this osi layer 2 network equipments.In one embodiment, configuration-direct is used to carry out method 100 disclosed herein.This instruction can be provided on osi layer 2 network equipments (for example bridge), and it is functional to be used to make this equipment can carry out TC according to the present invention.
37In the detailed description in front, with reference to accompanying drawing, this accompanying drawing forms the part of this description, and wherein shows by explanation and can implement specific embodiment of the present invention.Those skilled in the art fully described these embodiment and particular variant thereof in detail, so that can implement embodiments of the invention.It should be understood that under the situation that does not break away from spirit or scope disclosed by the invention, can utilize other suitable embodiment and can carry out the change of logic, machinery, chemistry and electricity.For fear of unnecessary details, customizing messages well known by persons skilled in the art has been omitted in this description.Therefore preceding detailed description is not to be intended to be limited to the particular form of listing at this, but is intended to cover replacement scheme, modification and equivalent in the spirit and scope that can rationally be included in appended claims on the contrary.
Claims (10)
1. one kind is used for providing topology change functional method at Bridged Local Area Network (LAN), comprising:
Determine that Multiple Spanning Tree Instance (MSTI) master port on the bridge of LAN is " forwarding " state from corresponding public Internal Spanning Tree example (CSTI) root port state-transition; And
Is " transmission " state that is used to make it possible to send from described MSTI master port topology change (TC) BPDU message with the port transmit state machine of described bridge from " free time " state-transition,
Wherein described definite in response to carrying out, carry out described transformation.
2. method according to claim 1 also comprises:
In response to carrying out described transformation, send topology change (TC) BPDU message from described MSTI master port.
3. method according to claim 1 also comprises:
Remove corresponding public Internal Spanning Tree example (CSTI) the root port state synchronization on described Multiple Spanning Tree Instance (MSTI) master port state and the described bridge, wherein described to carry out described releasing before determining synchronous carrying out.
4. method according to claim 3 also comprises:
In response to carrying out described transformation, send topology change (TC) BPDU message from described MSTI master port.
5. method according to claim 1, wherein said determine to comprise determine to propose agree sequence completing successfully on described MSTI master port.
6. OSI(Open Systems Interconnection) layer 2 network equipment comprise:
Be used to determine that Multiple Spanning Tree Instance (MSTI) master port on the bridge of LAN has been the instruction of " forwarding " state from corresponding public Internal Spanning Tree example (CSTI) root port state-transition; And
The port transmit state machine that is used for described bridge is the instruction that is used to make it possible to send from described MSTI master port " transmission " state of topology change (TC) BPDU message from " free time " state-transition.
7. equipment according to claim 6 also comprises:
Be used in response to carrying out described transformation, the instruction of sending topology change (TC) BPDU message from described MSTI master port.
8. equipment according to claim 6 also comprises:
Be used to remove the instruction of corresponding public Internal Spanning Tree example (CSTI) the root port state synchronization on described Multiple Spanning Tree Instance (MSTI) master port state and the described bridge, wherein described to carry out described releasing before determining synchronous carrying out.
9. equipment according to claim 8 also comprises:
Be used in response to carrying out described transformation, the instruction of sending topology change (TC) BPDU message from described MSTI master port.
10. equipment according to claim 6, the described instruction that wherein is used to determine comprise that being used for definite proposal agrees the instruction that complete successfully of sequence on described MSTI master port.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236942A (en) * | 2013-04-07 | 2013-08-07 | 潍坊学院 | Ethernet port role control device and method for OLT (optical line terminal) equipment |
| WO2022160211A1 (en) * | 2021-01-28 | 2022-08-04 | 华为技术有限公司 | Method and apparatus for avoiding loop |
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2006
- 2006-08-11 CN CNA2006101157231A patent/CN101123550A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236942A (en) * | 2013-04-07 | 2013-08-07 | 潍坊学院 | Ethernet port role control device and method for OLT (optical line terminal) equipment |
| CN103236942B (en) * | 2013-04-07 | 2015-08-26 | 潍坊学院 | A kind of optical line terminal equipment ethernet port character control device and method |
| WO2022160211A1 (en) * | 2021-01-28 | 2022-08-04 | 华为技术有限公司 | Method and apparatus for avoiding loop |
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