CN100477601C - Characteristic identifying message for link aggregation marker protocol - Google Patents
Characteristic identifying message for link aggregation marker protocol Download PDFInfo
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- CN100477601C CN100477601C CNB2006100721299A CN200610072129A CN100477601C CN 100477601 C CN100477601 C CN 100477601C CN B2006100721299 A CNB2006100721299 A CN B2006100721299A CN 200610072129 A CN200610072129 A CN 200610072129A CN 100477601 C CN100477601 C CN 100477601C
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/52—Multiprotocol routers
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Abstract
A network element aggregates a number of its ports together to form a link aggregation group. To move communications from one of the aggregated ports in case that port fails or otherwise becomes inactive, the network element may use exchange a special marker message and response with a remote network element coupled to the failed port. The network elements use proprietary signaling within the special marker message and response to enable the exchange of these messages on an active one of the aggregated ports while identifying the failed one of the ports.
Description
Technical field
Present invention relates in general to network management, relate more specifically to the purge mechanism (purge mechanism) in a kind of link aggregation group management.
Background technology
Link aggregation group (LAG) is combined into single logical link with a plurality of physical network links, and this logical links provides the throughput of polymerization and high availability to terminal.Carry out two communication between terminals by this single logical link LAG.
Summary of the invention
According to the present invention, provide the technology of the special sign message that is used for realizing link aggregation sign agreement.These technology for example can will be communicated by letter in LAG apace and be moved to active link from faulty link.
According to specific embodiment, a kind of method that is used in the link aggregation group mobile communication, this method: a plurality of physical ports are polymerized to link aggregation group, and between described port, distributing the frame that receives according to partition function, this partition function mapping is used for the frame of a plurality of dialogues so that be mapped to specific of described port from all frames of any one given dialogue.Described method detects the fault with one of described port corresponding link, generates the special sign message of the described faulty link of sign, and uses the effective port in the described port to send described special sign message.Described method receives the special sign response, check the response of this special sign determining whether described special sign response has identified described faulty link, and adjust described allocation algorithm so that one or more dialogues are moved to one or more other ports the described port from described non-working port.
Embodiments of the invention provide the multiple technologies advantage.Specific embodiment provides special sign message to move to active link will communicate by letter apace from faulty link.For example, use described special sign message, terminal can be before communication not be moved to active link wait timeout, and can when detecting link failure, begin the processing of mobile communication.According to specific embodiment, described special sign message further provides bigger link availability.When the communication on the faulty link is moved to active link, can continue the communication on other active link.
Those skilled in the art will understand other technological merit of the present invention easily from following accompanying drawing, explanation and claim.In addition, although above enumerated certain benefits, various embodiment can comprise cited advantage whole, some or do not comprise these advantages.
Description of drawings
In order more completely to understand the present invention and advantage thereof, now carry out following explanation in conjunction with the accompanying drawings, in the accompanying drawings:
Fig. 1 shows the communication system that comprises the LAG that implements purge mechanism according to the specific embodiment of the invention;
Fig. 2 shows the exemplary network element in the system of Fig. 1;
Fig. 3 is a flow chart, and the method for the frame distributor at transport network elements place by purge mechanism mobile session between port used in its expression;
Fig. 4 is a flow chart, and its expression uses the frame gatherer that receives the network element place by the method for purge mechanism in response to the decision of mobile session between port;
Fig. 5 is the flow chart that the method for mechanism is adjusted in distribution that expression realizes being used for LAG;
Fig. 6 is a flow chart, and its expression uses the frame distributor at transport network elements place to realize the method for special sign message; And
Fig. 7 is a flow chart, the method that its expression uses the frame gatherer at reception network element place that special sign message is responded.
Embodiment
Fig. 1 shows the communication system that general usefulness 10 is represented, it comprises the LAG that realizes purge mechanism.Terminal 18 communicates with one another by the network 12 that uses network element 16.Usually, network element 16 is set is used to form LAG, between terminal 18, to carry out high-speed communication.In order to support the operation of LAG, network element 16 can be realized down surface technology, comprising: the purge mechanism of fast moving session between the link in LAG, from LAG because of be out of order or link that other reasons lost efficacy in effectively the extension flag agreement of mobile communication and the distribution adjustment algorithm that helps effectively to support and use fully the link among the LAG.Network element 16 can be realized some or all operations with support LAG in these technology.
In the embodiment shown, network 12 comprises at least one network manager 14 and a plurality of network element 16.Network manager 14 monitors the also behavior of Control Network element 16.For example, network manager 14 provides configuration information for network element 16.Particularly, network manager 14 can form and manage LAG between network element 16.As example, network manager 14 can monitoring network the traffic in 12, and change the use of link 17 and LAG in response to network state.
Each link 17 all represent can be between network element 16 any suitable channel of switching signal.Network element 16 can carry out a plurality of communications simultaneously on a plurality of links 17.When communicating, can be between link 17 mobile communication.Terminal 18 will comprise that the LAG 15 of one or more physical links 17 works as the single logical link that acts on communication and treats.Network element 16 polymerization in any suitable way, and the link 17 of any suitable quantity can be condensed together to form one or more LAG 15.For example, network element 16 can have and amounts to eight links 17, and three links 17 of polymerization to be forming a LAG 15, and two links 17 are forming the 2nd LAG15 in addition in polymerization, and its excess-three link 17 is operated and not polymerization separately.
Any suitable device that terminal 18 representatives can be communicated by letter with network 12.Communicate between terminal 18 by switching frame.Any suitable communication protocol of terminal 18 uses is come audio frequency, voice, data, video or the out of Memory in the switching system 10.Terminal 18 can be any combination that the hardware and/or the software of communication service are provided to the user.For example, terminal 18 comprises server, personal computer (for example, laptop computer or desktop computer), procotol (IP) telephone set, or any suitable device that can communicate in system 10.
According to specific embodiment, the parts in the system 10 use ethernet standard to carry out frame traffic.Frame comprises any suitable data section, for example grouping, frame or cell.In addition, Ethernet and ethernet standard comprise the communication protocol of the exploitation for frame transmission between the processing unit, comprise any expansion of occurring at these agreements, add and/or further develop.For example, ethernet standard is included in the agreement that proposes in (IEEE) 802.3 of IEEE and the appendix.
As mentioned above, LAG 15 is as the single logical link that is formed by a plurality of independent physical link 17 that is connected between the network element 16.During operation, two network elements 16 that connected by specific LAG 15 can be used as this LAG 15 single physical that has some restrictions potentially and connect and treat.As operation example, suppose that terminal 18a communicates by letter with terminal 18b by network 12, and the link 17a-17c polymerization formation LAG 15 between network element 16a and the 16b.Communicating by letter between network element 16a and the network element 16b can be called session.According to specific embodiment, each session on the single link 17 in the given LAG 15 of network element 16 maintenances.This can help to keep the frame in the session to sort.If assign sessions unevenly between the link 17 in LAG 15 then can cause the utilance of the full bandwidth of LAG 15 relatively poor.In addition, the fault of a link 17 will be cut off the session of being undertaken by this link 17 potentially.Therefore, in response to the link utilization of link failure, difference, reconfigure or situation that other is suitable, can switch the session in the middle of the link 17 in the LAG 15.
During operation, network element 16 can use any suitable technology to distribute the frame that is received between the link 17 of LAG 15.According to specific embodiment, network element 16 adopts allocation algorithm to select concrete link 17 for the frame of each reception.For example, network element 16 can be selected a concrete link 17 based on the addressing information that comprises in each frame (for example, source or destination address information) in LAG 15.This algorithm can be guaranteed all to transmit along identical link 17 from a terminal 18 all frames to another terminal 18, and it is hereby ensured the correct ordering of frame.This allocation algorithm need not come the distribution of trace session based on the memory of state, but can cause relatively poor ground session distribution between link 17.Scheme as an alternative can be distributed to link 17 among the LAG 15 in the wheel mode of (round-robin) of crying with session.Yet, using for example to take turns and make the distribution technique based on state of technology need storage operation, this is owing to must follow the tracks of the distribution of session between the different links 17.
In order to reduce when obtaining link 17 to utilize advantage of uniform the needs based on the distribution technique of state, network element 16 can support to be used for to adjust the mechanism that frame distributes between the link 17 of LAG 15.For example, suppose the one or more links 17 that fully use among the concrete LAG 15, then network element 16 can change the distribution of the communication between the link 17 among this LAG 15.According to specific embodiment, network element 16 is supported a plurality of different allocation algorithms, and network manager 14 can be selected between these different algorithms in response to any suitable network state.For example, network element 16 can respectively provide multiple different algorithm, and each algorithm is all based on some combination of source and/or destination address information and calculate concrete link 17 among the LAG 15.By using Datagram various combination also to use different functions potentially with part, these algorithms can carry out the difference of frame between the link 17 and distribute when still keeping correct frame to sort.Network manager 14 can change the allocation algorithm that used by one or more network elements 16 automatically or manually to overcome underusing of LAG 15.
Except the plurality of distribution algorithm was provided, network element 16 can also be supported to use allocation of parameters in combination with one or more allocation algorithms.These parameters also can influence by using the partition function that allocation algorithm obtains.For example, allocation of parameters can change the address part of being considered by concrete allocation algorithm.By using in combination, allocation algorithm that quantity is few relatively and parameter can provide a large amount of potential partition functions.
Changing under allocation algorithm or parameter, link 17 faults, LAG 15 reconfigures or other the is suitable situation, can mobile session between the link among the LAG 15 17.For mobile communication between the link in LAG 15 17 apace, network element 16 can adopt purge mechanism.Alternatively or additionally, network element 16 can link 17 be out of order or invalid situation under adopt extension flag agreement (extended marker protocol).
For mobile communication normally between the link in LAG 15 17, network element 16 can support to indicate agreement, and this sign agreement can be based on the standard of for example IEEE (IEEE) 802.3 clauses 43.Continue the example presented above, suppose that session between terminal 18a and the terminal 18b relates to from terminal 18a to transmit frame stream, and network element 16a uses link 17a that these frames are transferred to network element 16b to terminal 18b.In response to link 17a fault, session is redistributed or other is suitable situation, network element 16a can determine the session on the link 17a is moved to another link 17 among the LAG 15.
In order to move described session (or a plurality of session) apace, network element 16a can use purge mechanism.In an exemplary embodiment, this purge mechanism comprises to be forbidden additional frame is distributed to the output queue relevant with link 17a also potentially from output queue drop (drop) some or all frames relevant with link 17a.Network element 16a is to the message of network element 16b transmission about mobile session.For example, network element 16a can use the administration queue relevant with link 17a to send banner message to network element 16b.When network element 16b responded to this message, network element 16a can move to this session another link 17 in the LAG 15.Service marking message and sign response can help to guarantee that the frame to transmission on the LAG 15 suitably sorts.By adopting purge mechanism, can mobile apace session between link 17.
According to specific embodiment, all sessions that network element 16a uses this purge mechanism to move to take place on link 17a.For example, network element 16a can move to link 17c from link 17a with a plurality of sessions, perhaps can propagate session between two or more other links 17 in given LAG 15.In addition, network element 16 can use purge mechanism simultaneously on a plurality of different links 17.For example, network element 16 can combine with redistributing based on the session between the link 17 of the variation of allocation algorithm, uses purge mechanism on all links 17 in LAG 15.
In conjunction with other situation or in other cases, network element 16 can be carried out the extension flag agreement further to help to support the communication between the mobile link 17.For example, if one of them link 17 fault or invalid in the LAG 15, then network element 16 can adopt the extension flag agreement.According to specific embodiment, network element 16 can pass through special sign message on the active links 17 and special sign response in the exchange LAG 15, and to the LAG 15 interior specifically fault or invalid the responding of links 17.Use these specific communications, network element 16 can be removed communication from out of order link 17 apace not relying under timeouts or other the machine-processed situation.According to specific embodiment, the field during described special sign message is used conventional sign message and responded with response only can be by the additional information of network element 16 understandings that suitably enable but provide.
To describe in more detail below and be used to implement purge mechanism, extension flag agreement and distribute the specific embodiment of adjusting.Yet,, it should be understood that these examples only for the providing of illustrative purpose, so system 10 can adopt the network element 16 of having used any appropriate technology although concrete example is provided in this manual.In addition, the specific embodiment that illustrates and describe at system 10 is not intended to carry out exclusive or limits.Although, should notice that these are logical descriptions with the element that the elements in system 10 and the system 10 are described as having customized configuration and structure, the parts of system 10 and function can be in logic and physically suitably make up, discrete and distribution.In addition, the function that can provide the element in system 10 and the system 10 by any suitable set and the configuration of parts.
Fig. 2 shows the exemplary network element 16 from the system 10 of Fig. 1.Network element 16 can comprise any suitable combination and the configuration of parts and module.In the embodiment shown, network element 16 comprises the LAG element 20 of being convenient to form LAG 15, the network operating element controller 21 of the parts in the supervising the network element 16, and the port 22 that communicates by link 17, link 17 forms LAG 15 through polymerization.LAG element 20 comprises LAG controller 24 and one or more LAG module 26.Each LAG module 26 all comprises: media interviews control (MAC) client computer 28; And the polymerizer 30 that comprises frame distributor 32 and frame gatherer 34.Port 22 comprises one or more output queues 50, CPU (CPU) formation 52 and input rank 54, and they are convenient to the communication of frame 56.Usually, the parts in the network element 16 are convenient to communicate between terminal 18 by network 12.More specifically, the parts in the network element 16 provide the purge mechanism of mobile session between the link of being convenient in LAG15 17.
Network element controller 21 representative comprises the hardware of any suitable control logic, other parts that they can supervising the network element 16 inside or the operation of module.For example, network element controller 21 can be operated to load and to carry out software or other control logic from any appropriate source.
Any suitable physical interface of port 22 representatives comprises suitable control logic, is used for being connected with the parts of system 10.In one embodiment, port 22 is represented the physical interface between the network element 16.Port 22 to other port 22 transport communications can be called source port 22.Alternatively, the port 22 from other port 22 received communications can be called destination interface 22.When in communication period two-way exchange information, any port 22 can be used as source port 22 and destination interface 22.Port 22 can comprise any suitable mode of operation.For example, port 22 can have disabled status, study (learning) state and forwarding state.Occur when learning state can be in frame entry port 22, and forwarding state can be when frame passes in and out port 22 normal discharge operating period occurs.Network element 16 comprises the port 22 of any suitable quantity.Each port 22 can have relevant physical address.For example, each port 22 can be assigned the MAC Address of unique global administration.Port 22 can be connected by the link 17 of representing the communication channel between the port 22.Each port 22 can be corresponding to a link 17.Can the communication between the portable terminal 18 between the link in the LAG 15 17.If one or more links 17 are out of order among the LAG 15, then the communication between the mobile link 17 for example provides load balancing and has kept the availability of session.
Communication also is convenient in formation in the port 22.Output queue 50 is from frame distributor 32 received frames 56, and maintenance frame 56 is to be transferred to network element 16.According to specific embodiment, output queue 50 is come transmission frame 56 based on first in first out.Input rank 54 is from network element 16 received frame 56 and message, and frame 56 and message are offered frame gatherer 34.Cpu queue 52 gives information according to sign agreement and extension flag agreement and responds, with mobile session between the link in LAG 15 17.
Any suitable combination of the hardware and/or the software of link aggregation is convenient in element 20 representatives.Element 20 comprises controller 24 and one or more module 26.Controller 24 representative comprises the hardware of any suitable control logic, and it can manage other parts in the LAG element 20 or the operation of module.For example, controller 24 is convenient to generate LAG 15, monitors the behavior of existing LAG 15, and provides any suitable functional so that link aggregation.In specific embodiment, controller 24 determine which link 17 can polymerization, aggregated links 17, bundling port 22 be to polymerizer 30, and monitors LAG 15.In another embodiment, network manager 14 is manually controlled the change of link aggregation.
It can be the correlation module 26 of the logical description (logicaldepiction) in the element 20 that the LAG 15 of each negotiation has.Module 26 has made things convenient for the functional of its relevant LAG 15, and is used to realize the change of the feature in the LAG 15.For example, when link 17 effectively the time, can use module 26 that the link 17a in the LAG 15 are gone up the communications that occur and move to link 17c.As another example,, then can use module 26 that the communication on the link 17a is moved to link 17c if link 17a is out of order in communication period.
Each module 26 all comprises MAC client computer 28 and polymerizer 30.MAC client computer 28 representative is used for the logical medium access controller of LAG 15, and polymerizer 30 is supported by the frame traffic of link 17 and realized feature in the LAG 15.To send and received frame 56 in order being supported between the network element 16, polymerizer 30 to be tied to one or more ports 22.
In by polymerizer 30 transmissions and received frame 56, keep the order of frame 56 in communication period.Frame distributor 32 is convenient to communicating by letter of frame 56 with frame gatherer 34.Frame distributor 32 uses the link 17 that forms LAG 15 to distribute the frame 56 that comes self terminal 18 on port 22.It is chaotic to prevent frame 56 orders that frame distributor 32 guarantees that the frame 56 of concrete session sends port 22 to.Frame distributor 32 is carried out any suitable allocation algorithm, and described algorithm is selected to be used to transmit any given frame 56 or belonged to the link 17 of a framing 56 of a session.Selected allocation algorithm can prevent the frame 56 order confusions of session and duplicating of frame 56.Based on selected allocation algorithm, the frame of given session is forwarded (forward) and gives port 22.Described allocation algorithm can be based on the combination of destination address, source address, destination address and source address, address or any other suitable standard of receiving port 22.
Frame gatherer 34 transmits to terminal 18 from port 22 received frames 56 and with the frame 56 that receives.According to specific embodiment, frame 56 is forwarded out another port 22, and this port can directly be connected with terminal 18 or can be to the path of terminal 18.For example, frame gatherer 34 received frame 56 from the one group of link 17 that forms LAG 15.For any given port 22, frame gatherer 34 sends frame 56 to MAC client computer 28 according to the order that receives from port 22.Frame gatherer 34 can be selected from the frame 56 of aggregation port 22 receptions by any order.Because frame distributor 32 has been guaranteed frame 56 and kept their order,, and keep the frame sequential of communication so frame gatherer 34 can carry out any rearrangement to the frame 56 that receives from a plurality of links 17.
As mentioned above, network element 16 is supported sign agreement and extension flag agreement.These two agreements all provide the communication in the middle of the polymerization.Use these agreements, for example the frame distributor 32 service marking agreements of network element 16a or extension flag agreement generate sign and it are distributed to the frame gatherer 34 of network element 16b.The frame gatherer 34 service marking agreements of network element 16b or extension flag agreement are to the frame distributor 32 distribution sign responses of network element 16a.The message that comprises sign and sign response in the sign agreement can have any suitable form.As mentioned above, the sign agreement is used for mobile session between the link 17 in LAG 15.Service marking agreement, controller 24 generate this sign of transmission on sign and the one or more active links 17 in LAG 15.The frame distributor 32 of frame gatherer 34 in sending network element 16 that receives in the network element 16 provides the sign response.Removing the process of session from a link 17, can interruptedly not continue the session on other link 17.Alternatively, network element 16 can the service marking agreement mobile session between two or more links 17 in relevant LAG 15.For example, controller 24 can generate a plurality of banner messages and transmit these banner messages on one or more links 17, and after receiving response, moves the session that occurs on these links 17.
Sign in the extension flag agreement and sign response (perhaps being respectively the response of special sign and special sign) can have any suitable form.In the exemplary embodiment, the message in the extension flag agreement comprises following form:
| The MAC Address of destination address=destination interface |
| The MAC Address of out of order source port of source address=not |
| Type=0x8809 |
| Subtype=sign agreement |
| Version=0x01 |
| TLV; Flag information=0x01, sign response=0x02, special sign=0x03, special sign response=0x04 |
| Message length=0x10 (16 10) |
| The requester port |
| The requester system |
| Requester affairs ID=is at the non-working port of particular message |
| Fill (pad)=0x0000 |
| Full stop=0x00 |
| Full stop length=0x00 |
| Keep |
| FCS |
As mentioned above, the extension flag agreement can be used when link 17 is out of order or is invalid, and session is moved to one or more active links 17.According to an embodiment of extension flag agreement, provide special sign on the active link 17 of the frame distributor 32 among the network element 16a in LAG 15.Frame gatherer 34 among the network element 16b provides the special sign response to frame distributor 32.Removing the process of session from a link 17, can interruptedly not continue the session on other link 17.Alternatively, network element 16 can use the extension flag agreement to move session between two or more links 17 in the relevant LAG 15.For example, controller 24 can generate a plurality of banner messages and transmit these banner messages on one or more links 17, and after receiving response, moves the session that occurs on these links 17.
According to an embodiment, the extension flag agreement is used for identifying fault or invalid link 17 in message.For example, message format can comprise the MAC Address of the port 22 relevant with faulty link 17 in requester affairs id field.As another example, the TLV field is used for message is identified as special sign or special sign response.Use the extension flag agreement, frame distributor 32 generates the special sign that uses the active link 17 in the LAG 15.Frame gatherer 34 sends the special sign response to frame distributor 32, and frame distributor 32 determined not have ongoing frame 56 before mobile session.Removing the process of session from fault or invalid link 17, can interruptedly not continue the communication on other link 17.
Although the specific embodiment that concentrates on network element 16 is described in shown embodiment and front, system 10 can adopt has parts and any suitable combination of module and the network element 16 of configuration of supporting the purge mechanism among the LAG 15.Therefore, can suitably separate or make up by shown in concrete element carry out functional, and in these elements some or all can be implemented by the logic of encoding in medium.For example, can suitably separate and/or the function of combined frames distributor 32 and frame gatherer 34, and can implement in their operations any by suitable control logic.And although be shown as individual module, the functional of some or all of parts shown in the network element 16 also can be distributed between other element of system 10.
Fig. 3 is a flow process Figure 30 0, and it shows the method for using the frame distributor 32 that sends network element 16 places to utilize purge mechanism mobile session between port 22.The frame distributor 32 of the aforesaid network element 16 of reference has provided the following description to flow process Figure 30 0.Yet any suitable element or elements combination can be implemented step described below.
For the ease of using LAG 15 to communicate by letter between terminal 18, in step 302, frame distributor 32 is by link 17 transmission frames 56 among the LAG 15.In communication period,, determine whether one or more sessions are moved to another link 17 among the LAG 15 in step 304.If not mobile session, then frame distributor 32 continues to distribute frame 56 by the link among the LAG 15 17.On the other hand, will mobile session if determine, then in step 306, the link 17 among frame distributor 32 no thoroughfare the LAG 15 distributes frames 56.Forbid distributing and for example prevented that additional frame 56 is placed in the output queue 50.Frame distributor 32 enters the removing state, and in step 308, abandons all the other frames 56 in the output queue 50.During this removing state, frame distributor 32 can abandon all frames 56 that are intended to invalid link 17, handles the frame that abandons by the upper strata Restoration Mechanism.Therefore, cpu queue 52 can begin to send the sign protocol message, and does not wait for the transmission of all the other frames 56 in the output queue 50.According to specific embodiment, during the removing state, output queue 50 can continue to handle and transmission control frame, for example Bridge Protocol Data Unit (BPDU) frame.
In step 310, frame distributor 32 is transferred to each link 17 among the LAG 15 with banner message.For example, frame distributor 32 generates banner message and described banner message is placed in each cpu queue 52 with transmission on link 17.Banner message can comprise that being used for informing network element 16 can move to any appropriate information of another link 17 the LAG 15 with communicating by letter from the link 17 of LAG 15.According to the format sample of the message in the sign agreement that provides above,, then this message is identified as banner message if the value of TLV is 0x01.
In step 312, frame distributor 32 receiving flags response.In step 314, determine whether not finish the additional mark response of (outstanding).If frame distributor 32 can receive additional response, then method proceeds to step 316, and frame distributor 32 is waited for and received additional sign response.From step 316, can receive the additional mark response in step 312, thereby method continues.In one embodiment, frame distributor 32 is waited for from having received each link 17 receiving flags response of banner message.In this embodiment, frame distributor 32 is waited for the different time periods according to the quantity of additional uncompleted sign response.In another embodiment, frame distributor 32 starts timer when waiting for the response of reception additional mark.Frame distributor 32 can use this timer that the configurable time quantum of waiting for the additional mark response is provided.This timer can be configured to any suitable during.Use this timer, even the response of additional sign is not finished, frame distributor 32 does not continue to wait for the additional mark response yet.
Yet if the additional mark response is all finished, this method proceeds to step 318.In step 318, session is moved to another link 17 among the LAG 15.Frame distributor 32 turns back to non-removing state, and makes in step 320 can distribute frame 56 in LAG 15.Session continues on the active link in LAG 15 17 then.
The frame distributor 32 that aforementioned flow chart 300 shows in the network element 16 uses purge mechanism to move the exemplary operation of one or more sessions between port 22.Yet aforementioned flow chart 300 and appended description have only illustrated exemplary methods of operationthe.Therefore, can be simultaneously and/or with shown in a plurality of steps in the different order flowchart 300.In addition, frame distributor 32 can adopt the method with additional step, less step and/or different step, as long as this method keeps suitably.
Fig. 4 is a flow chart 400, and it shows and uses the frame gatherer 34 that receives network element 16 places by the method for purge mechanism in response to the decision of mobile session between port 22.The frame gatherer 34 of the aforesaid network element 16 of reference has provided the following description to flow process Figure 40 0.Yet any suitable element or elements combination can be implemented following actions.
For the ease of using LAG 15 to communicate by letter between terminal 18, in step 402, frame gatherer 34 is by link 17 received frames 56.In communication period,, determine whether communication is moved to another link 17 among the LAG 15 in step 404.If not mobile session, then frame gatherer 34 continues by link 17 received frames 56 among the LAG 15.On the other hand, will mobile session if determine, then in step 406, frame gatherer 34 receiving flag message.For example, make decision session being moved to another link 17 among the LAG 15, and the frame gatherer 34 of frame distributor 32 in another network element 16 sends banner messages.In step 408, frame gatherer 34 is determined the state with one or more input port 22 corresponding one or more output queues 50.For example, controller 24 uses interruption or checks the state of output queue 50 by reading the output queue status register.In addition, frame gatherer 34 can be determined the state with each input port 22 corresponding output queue 50.
In step 410, frame gatherer 34 sends the sign response to frame distributor 32.The sign response comprises any appropriate information in response to the banner message of mobile communication between link 17.For example, the sign response confirmation did not have pending frame 56 before mobile communication.According to the format sample of the message that indicates agreement, if the value of TLV is 0x02, then this message is identified as the sign response.
The same with flow chart 300, exemplary methods of operationthe has only been represented in flow chart 400 and appended description, and frame gatherer 34 and/or other suitable components can adopt any suitable technique of using purge mechanism mobile communication between port 22.Therefore, can be simultaneously and/or with shown in a plurality of steps in the different order flowchart 400.In addition, frame gatherer 34 can adopt the method with additional step, less step and/or different step, as long as this method keeps suitably.
Fig. 5 shows the flow chart 500 that the method for mechanism is adjusted in the distribution that is used for realizing LAG 15.By provide following description with reference to aforesaid network element 16 to flow process Figure 50 0.Yet any suitable element or elements combination can be implemented following step.
For the ease of using LAG 15 between terminal 18, to communicate by letter, select allocation of parameters in step 502.Can provide a plurality of allocation of parameters how to be used for determining assign sessions between link 17.Can select any suitable allocation of parameters.For example, allocation of parameters comprises the measuring of link activity, the configuration of system 10 or the state of network element 16.Any appropriate members of system 10 can be selected allocation of parameters, and for example network element 16 or network manager 14 can be selected allocation of parameters.In case selected allocation of parameters, just selected partition function in step 504.This partition function is according to selected allocation of parameters assign sessions between link 17.In one embodiment, each allocation of parameters is associated with one or more partition functions.In this embodiment, among the described partition function that is associated, select partition function.Can select any partition function of being associated with selected allocation of parameters.The same with allocation of parameters, any appropriate members of system 10 can be selected partition function, for example network element 16 or network manager 14.In step 506, network element 16 is by link 17 switching frames 56 among the LAG 15.
Can adjust selected allocation of parameters and partition function in communication period.During step 508, monitor the performance of LAG 15.Monitor performance comprises any suitable parameters of surveillance 10, for example the activity of link 15 or between port 22 validity of switching frame 56.For example, monitor the parameter of determining by selected allocation of parameters.If link activity measured selection as allocation of parameters, monitoring link activity during step 508 then.In step 510, determine whether to adjust selected partition function.For example, network manager 14 may detect between the link 17 of session in LAG 15 and distribute unevenly.If determine not adjust selected partition function, then begin to continue to monitor the performance of LAG 15 from step 508.
Alternatively, if determine to adjust selected partition function, then network element 16 starts the processing that is used to implement to distribute the mechanism of adjustment.For example, if, then can adjust partition function by using different partition functions can improve the performance of LAG 15.As example, if measuring of link activity is selected allocation of parameters, then the situation lower network element of underusing at link 17 16 can be adjusted partition function.In step 512, network element 16 is forbidden the link among the LAG 15 17 is distributed frame 56.Forbid distributing and for example prevented that additional frame 56 is placed in the output queue 50.In step 514, network element 16 abandons remaining frame 56 in the output queue 50.Therefore, cpu queue 52 can begin to send message with the sign agreement, and does not wait for the transmission of all the other frames 56 in the output queue 50.Although frame 56 is dropped, output queue 50 can continue to handle and export for example control frame of BPDU frame.
In step 516, network element 16 each link 17 in LAG 15 sends banner message.For example, network element 16 generates banner message, and cpu queue 52 sends this banner message.This banner message can comprise and is used to notify purpose network element 16 can redistribute any appropriate information of session between link 17.Format sample according to the message that indicates agreement if the value of TLV is 0x01, then is identified as banner message with this message.
In step 518, network element 16 receiving flags response.Determined whether uncompleted additional mark response in step 520.If network element 16 can receive additional response, then method proceeds to step 522, and network element 16 is waited for and received the additional mark response.From step 522, can receive the additional mark response in step 518, thereby method continues.In one embodiment, network element 16 is waited for from having received each link 17 receiving flags response of banner message.In this embodiment, network element 16 according to the quantity of additional not complement mark response wait for different during.In another embodiment, network element 16 starts timer when waiting for the response of reception additional mark.Network element 16 can use this timer to provide to wait for during additional mark response configurable.This timer can be configured to any suitable during.Use this timer, even uncompleted additional mark response is arranged, when timer expiry, network element 16 does not continue to wait for the additional mark response yet.In another embodiment, network element 16 can have thereon on the link 17 of the response of complement mark and transmits banner message.
Yet if there is not uncompleted additional mark response, this method proceeds to step 524.In step 524, adjust selected partition function.As mentioned above, selected partition function is adjusted into the performance that another partition function that is associated with allocation of parameters can improve LAG 15.The service marking agreement even adjusted partition function, also can keep the order of frame 56 in session.As mentioned above, any appropriate members of system 10 can be adjusted selected partition function.For example, network manager 14 can automatically or by manually getting involved be adjusted partition function.As another example, management tool detects the performance of LAG 15 automatically, and automatically adjusts LAG15 by changing selected partition function.After the distribution of having adjusted between the link 17, make at step 526 network element 16 and can in LAG 15, distribute frame 56.Based on the partition function of adjusting, continue session by the link among the LAG 15 17.
Fig. 6 is a flow chart 600, and it shows the method for using the frame distributor 32 that sends network element 16 places to realize special sign message.The frame distributor 32 of the aforesaid network element 16 of reference provides the following description to flow process Figure 60 0.Yet, the step that any suitable element or elements combination can be implemented to describe below.
For the ease of using LAG 15 to communicate by letter between terminal 18, in step 602, frame distributor 32 is by link 17 transmission frames 56 among the LAG 15.In step 604, the fault of frame distributor 32 monitoring links 17 or other are invalid.If link 17 is not out of order, then frame distributor 32 continues to distribute frame 56 by the link among the LAG 15 17.On the other hand, if particular link 17 is out of order really, then in step 606, the source port 22 that frame distributor 32 forbiddings are associated with faulty link 17.
In step 608, frame distributor 32 generates special sign message on active link 17.This special sign message uses the extension flag agreement that session is moved on the active link.In step 610, transmission special sign message on the active link 17 of frame distributor 32 in LAG 15.For example, frame distributor 32 generates special sign message, and cpu queue 52 sends this special sign message.Special sign message can comprise that being used for informing network element 16 links 17 is out of order and communicates by letter and will move to any appropriate information of one or more active links 17.According to the format sample of the message of extension flag agreement, if the value of TLV is 0x03, then this message is identified as special sign message.And above-mentioned example format also provides requester to handle the MAC Address of non-working port 22 in the id field.
In step 612, frame distributor 32 receives the special sign response.According to the format sample of the message of extension flag agreement, if the value of TLV is 0x04, then this message is identified as the special sign response.In step 614, session is moved to one of them active link 17.Frame distributor 32 makes and can distribute frame 56 in LAG 15, and continues session by the link among the LAG 15 17.
Fig. 7 is a flow chart 700, the method that its 34 pairs of special sign message of frame gatherer that show use reception network element 16 places respond.The frame gatherer 34 of the aforesaid network element 16 of reference provides the following description to flow process Figure 70 0.Yet, the step that any suitable element or elements combination can be implemented to describe below.
For the ease of using LAG 15 to communicate by letter between terminal 18, in step 702, frame gatherer 34 is by link 17 received frames 56 among the LAG 15.In step 704, frame gatherer 34 monitors special sign message.For example, be combined on the link 17 normal process of the administrative messag that receives, frame gatherer 34 can detect the special sign message of sending from the frame distributor 32 of telecommunication network element 16 so that fault or invalid link 17 are notified to frame gatherer 34.If do not receive special sign message in step 706, then frame gatherer 34 continues to monitor special sign message in step 704.If receive special sign message, then this method proceeds to step 708.
In step 708, the state that frame gatherer 34 is determined corresponding to one or more output queues 50 of the port 22 that is associated with faulty link 17.For example, controller 24 uses interruption or checks the state of output queue 50 by reading the output queue status register.In step 710, frame gatherer 34 sends the special sign response to the frame distributor 32 that sends network element 16 places.Special sign response is included in after link 17 breaks down, any appropriate information that the special sign message of mobile communication between link 17 is responded.For example, the special sign response confirmation did not have pending frame 56 before mobile communication.According to the format sample of the message of extension flag agreement, if the value of TLV is 0x04, then this message is identified as the sign response.And aforesaid example format also provides the MAC Address of non-working port 22 in requester affairs id field.
Exemplary methods of operationthe has only been represented in aforementioned flow chart 700 and appended description, and frame gatherer 34 and/or other suitable components can use any appropriate technology that the special sign message of link aggregation sign agreement is responded.Therefore, can be simultaneously and/or with shown in a plurality of steps in the different order flowchart 700.In addition, frame gatherer 34 can adopt the method with additional step, less step and/or different step, as long as this method keeps suitably.
Although described the present invention with several embodiment, shown multiple variants and modifications to those skilled in the art, the present invention is intended to comprise these variants and modifications that drop in the claims scope of the present invention.
Related application
The application requires in U.S. Provisional Application sequence number 60/670 submission on April 12nd, 2005, " link aggregation and network management technology (Link Aggregation and Network Management Techniques) " by name, 369 priority is incorporated it into this paper by reference.
Claims (21)
1, a kind of method that is used in the link aggregation group mobile communication comprises:
The a plurality of physical ports corresponding with a plurality of links are polymerized to link aggregation group;
Distribute the frame that receives according to partition function between described a plurality of ports, this partition function mapping is used for the frame of a plurality of dialogues so that be mapped to specific of described a plurality of ports from all frames of any one given dialogue;
The fault of a corresponding link in detection and the described a plurality of ports;
Generate the special sign message of the described faulty link of sign;
Use the not corresponding effective port in described a plurality of port to send described special sign message with described faulty link;
The response of reception special sign;
Check that this special sign response is to determine whether described special sign response has identified described faulty link; And
Adjust described partition function so that one or more dialogues are moved to one or more other ports described a plurality of port from described non-working port.
2, method according to claim 1, wherein, generate and use identifier identifying described special sign message in the flag information field that described special sign message is included in described special sign message, and the sign of in the requester transaction identifiers field of described special sign message, specifying described non-working port.
3, method according to claim 1, wherein, check that described special sign response comprises that the identifier in the flag information field that the described special sign that identifies described special sign response is responded detects, and in response, determine by represented value in the requester transaction identifiers field of determining described special sign response whether described special sign response has identified described faulty link.
4, method according to claim 1 also comprises:
Send assignment flag message on each effective port in described a plurality of ports;
On described each effective port, receive the assignment flag response; And
After receiving described assignment flag response and the response of described special sign, adjust described partition function.
5, method according to claim 4 also comprises:
From with the corresponding output queue of described a plurality of ports remove frame;
Abandon the additional frame that receives at described a plurality of ports; And
After adjusting described partition function, make it possible to described a plurality of port assignment frames.
6, method according to claim 1 also comprises:
Use one in described a plurality of port to come receiving management message;
Check the flag information field in the described administrative messag, to determine that described administrative messag is a special sign message;
Determine a port identifying by described administrative messag in described a plurality of port;
Monitor and the corresponding one or more formations of port that identified; And
Send the special sign response in response to the state of described formation, the described port that identifies has been specified in the special sign that is sent response.
7, method according to claim 6, wherein, the state of described formation comprises that all frames in the described formation have all finished processing.
8, a kind of network element comprises:
A plurality of ports;
Polymerizer, it is corresponding with two or more ports relevant with a plurality of links that aggregate into link aggregation group in described a plurality of ports, and this polymerizer comprises frame gatherer and frame distributor;
Described frame distributor can be used for distributing the frame that receives according to partition function between described aggregation port, and this partition function mapping is used for the frame of a plurality of dialogues so that be mapped to specific of port of polymerization from all frames of any one given dialogue; And
Controller, can operate the fault of one of the port that is used to detect with described polymerization corresponding link, generate the special sign message of the described faulty link of sign, use the not corresponding effective port in the port of described polymerization to send described special sign message with described faulty link, the response of reception special sign, check the response of this special sign determining whether described special sign response has identified described faulty link, and adjust partition function so that one or more dialogues are moved to one or more other ports the described aggregation port from described non-working port.
9, network element according to claim 8, wherein, described controller also can be operated and be used for by inserting identifier to identify described special sign message in the flag information field of described special sign message, and the sign of in the requester transaction identifiers field of described special sign message, inserting described non-working port, thereby generate described special sign message.
10, network element according to claim 8, wherein, check that described special sign response comprises that the identifier in the flag information field that the described special sign that identifies described special sign response is responded detects, and in response, determine by represented value in the requester transaction identifiers field of determining described special sign response whether described special sign response has identified described faulty link.
11, network element according to claim 8, wherein:
Described frame distributor also can be operated and be used for sending assignment flag message on each effective port of the port of described polymerization;
Described frame gatherer also can be operated and be used for receiving the assignment flag response on each effective port of the port of described polymerization; And
Described controller also can be operated and be used for adjusting described partition function after described frame gatherer receives described assignment flag response and the response of described special sign.
12, network element according to claim 11, wherein, described frame distributor also is used for from removing frame with the corresponding output queue of described aggregation port, abandon the additional frame that receives at described aggregation port, and after adjusting described partition function, make it possible to distribute frame to described aggregation port.
13, network element according to claim 8, wherein:
Described frame gatherer also can be operated a receiving management message that is used for from described aggregation port;
Described controller also can be operated the flag information field that is used for checking described administrative messag, to determine that described administrative messag is a special sign message, determine a port identifying by described administrative messag in described a plurality of port, monitor and the corresponding one or more formations of port that identified, and generate the special sign response of having specified the described port that identifies in response to the state of described formation; And
Described frame distributor also can be operated and be used to send the described special sign response that is generated by described controller.
14, network element according to claim 13, wherein, the state of described formation comprises that all frames in the described formation have all finished processing.
15, a kind of system that is used in the link aggregation group mobile communication, this system comprises:
Be used for will a plurality of physical ports corresponding being polymerized to the device of link aggregation group with a plurality of links;
Be used for distributing between described port according to partition function the device of the frame that receives, this partition function mapping is used for the frame of a plurality of dialogues so that be mapped to specific of described a plurality of ports from all frames of any one given dialogue;
Be used to detect device with the fault of the corresponding link of one of described port;
Be used to generate the device of the special sign message that identifies described faulty link;
Be used for using not corresponding effective port of described port to send the device of described special sign message with described faulty link;
Be used to receive the device of special sign response;
Be used to check that this special sign response is to determine whether described special sign response has identified the device of described faulty link; And
Be used for adjusting partition function one or more dialogues are moved to the device of one or more other ports of described a plurality of ports from described non-working port.
16, system according to claim 15, wherein, the device that is used for generating described special sign message use described special sign message the flag information field identifier and in the requester transaction identifiers field of described special sign message, specify the sign of described non-working port.
17, system according to claim 15, wherein, the device that is used for checking described special sign response detects the identifier of the flag information field of the described special sign response that identifies described special sign response, and in response, determine by represented value in the requester transaction identifiers field of determining described special sign response whether described special sign response has identified described faulty link.
18, system according to claim 15 also comprises:
Be used on each effective port of described a plurality of ports, sending the device of assignment flag message;
Be used on described each effective port, receiving the device of assignment flag response; And
Be used for after receiving described assignment flag response and the response of described special sign, adjusting the device of described partition function.
19, system according to claim 18 also comprises:
Be used for from removing the device of frame with the corresponding output queue of described a plurality of ports;
Be used to abandon the device of the additional frame that receives at described port; And
Be used for after adjusting described partition function, making it possible to device to described a plurality of port assignment frames.
20, system according to claim 15 also comprises:
Be used for from the device of a receiving management message of described a plurality of ports;
Be used for checking that the flag information field of described administrative messag is to determine that described administrative messag is the device of special sign message;
Be used for determining described a plurality of ports by the device of a port identifying of described administrative messag;
Be used to monitor device with the corresponding one or more formations of port that identify; And
Be used for sending in response to the state of described formation the device of special sign response, the described port that identifies has been specified in the special sign that is sent response.
21, system according to claim 20, wherein, the state of described formation comprises that all frames in the described formation have all finished processing.
Applications Claiming Priority (2)
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| US67036905P | 2005-04-12 | 2005-04-12 | |
| US60/670,369 | 2005-04-12 |
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| CNB200610072127XA Expired - Fee Related CN100555992C (en) | 2005-04-12 | 2006-04-12 | Based on network routing scheme |
| CNB2006100721265A Expired - Fee Related CN100481772C (en) | 2005-04-12 | 2006-04-12 | Filtering method for link aggregation marker protocol |
| CNB2006100721250A Expired - Fee Related CN100547984C (en) | 2005-04-12 | 2006-04-12 | At the input port place of switch filtering frames |
| CNB2006100721299A Expired - Fee Related CN100477601C (en) | 2005-04-12 | 2006-04-12 | Characteristic identifying message for link aggregation marker protocol |
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Also Published As
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|---|---|
| CN100481773C (en) | 2009-04-22 |
| CN1848769A (en) | 2006-10-18 |
| CN1848767A (en) | 2006-10-18 |
| CN1848815A (en) | 2006-10-18 |
| CN1848768A (en) | 2006-10-18 |
| CN100555992C (en) | 2009-10-28 |
| CN1848814A (en) | 2006-10-18 |
| CN100547984C (en) | 2009-10-07 |
| CN100481772C (en) | 2009-04-22 |
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