CN101312426A - Loop preventing system and method for system of stackable Ethernet switch - Google Patents
Loop preventing system and method for system of stackable Ethernet switch Download PDFInfo
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Abstract
A loop prevention system applied in a stackable Ethernet switch system (SESS) and a method thereof are disclosed. In an embodiment, the logic for detecting the control management traffic on the stack port of a stackable switch element of the SESS is provided. The invention further comprises logics for responding the loss of the control management traffic on the stack port of the switch element of the SESS, to keep the open of the path of the control management traffic and activate the client traffic data on the stack port.
Description
The cross reference of related application
The application discloses and has owned the relevant theme of disclosed theme in the co-pending patent application together following: (I) with Ignatius D.Santoso, Roberto Henrique JacobDa Silva, " STACKMANAGER PROTOCOL WITH AUTOMATIC SETUP MECHANISM " (Alcatel reel number: 134196) of the name of Timothy Hicks and Vincent Magret; (II) with " the VIRUAL CHASSIS FOR CONTINUOUS SWITCHING " of the name of Harpal Mann and Vincent Magret (Alcatel reel number: 13458), here by with reference to it is included in.
Technical field
Relate generally to communication network of the present invention.More specifically, but, the present invention relates to be used for piling up loop preventing system and the method that the Ethernet switch system uses not as any restriction.
Background technology
In the data communication network based on ethernet technology, packet switch comprises multilayer switch and router, is used for effectively (operatively) and connects many nodes, is used for carrying out betwixt the communication of information block.Make the switch that does not independently rely on shared base plate have a plurality of ports and inner exchanging structure, inbound (inbound) grouping that is used for receiving in the entry port place be directed to suitable outer outbound port.In some realizations of prior art, by (promptly with selected switch ports themselves, stack port) is linked at effectively together so that create the stackable switch system that can be used as single switching entity operation, and links a plurality of independently switches, strengthen exchange capacity.This system is called stacked switchboard system sometimes, usually adopts together in the customer rs premise of for example enterprise.
In typical the realization, the stacked switch of a system interconnects effectively via a pair of stack port of being assigned on each switch, and a switch is also referred to as an element.The stacked switch of this system is connected in series usually, and the topology of this system is a feature with the open string (open strand) of the closed circuit that is called ring or the switch that is referred to herein as chain usually.The stacked switch identifier of being convenient to effectively transmission by use sends grouping via stack port, and these are packet-switching to suitable stacked switch element, each stacked switch is suitable for carrying out the exchange between the FPDP of himself FPDP and other stacked switch.
Known in comprising some framework of stackable switch element, when the processor controls of one of switch element became malfunction, the loopback of user data service amount can appear.In case set up loop in network, network becomes and can't use, and requires user intervention with maintenance issue, thus the inefficiency that causes the network downtime time and be associated.
Summary of the invention
Embodiment of the present disclosure relates to loop preventing system and the method that can operate in having the piled up Ethernet switch system (SESS) of a large amount of stacked switch elements.Substantially, provide control and management traffic carrying capacity on the stack port of the stacked switch element that logic is used to monitor SESS.Also comprise logic, being operable as response determines to have losing of control and management traffic carrying capacity on the stack port of the concrete switch element of SESS, be used for when retentive control management service amount path is open the subscriber traffic data of deexcitation on this stack port.
An embodiment relates to a kind of loop prevention method that can operate in the piled up ethernet node with at least two stackable switch elements, wherein each switch element comprises at least one stack port and at least one core switch port, makes the core switch port be operable as and is connected to core switch.This loop prevention method comprises: the control and management traffic carrying capacity on the stack port of each of supervision stackable switch element; And when on the stack port of the concrete switch element of determining to pile up node, having the losing of control and management traffic carrying capacity, user data service amount on the stack port of the concrete switch element of deexcitation is with the loop situation of the user data service amount that relates in the network environment of avoiding disposing therein node.
Another embodiment relates to the loop prevention equipment that can operate in the piled up ethernet node with at least two stackable switch elements, wherein each switch element comprises at least one stack port and at least one core switch port, makes the core switch port be operable as and is connected to core switch.This loop prevention equipment comprises: the device that is used to monitor the control and management traffic carrying capacity on the stack port of each stackable switch element; An and such device, it is operable as response and determines to pile up on the stack port of concrete switch element of node and have losing of control and management traffic carrying capacity, be used for the user data service amount on the stack port of the concrete switch element of deexcitation, with the loop situation of the user data service amount that relates in the network environment of avoiding disposing therein node.
Further embodiment relate to can be in as the ethernet environment that can pile up the Ethernet switch system network operating node, comprise: at least two stackable switch elements, wherein each switch element comprises at least one stack port and at least one core switch port, makes the core switch port be operable as and is connected to core switch; Such logic, it is associated with each stackable switch element, is used to monitor the control and management traffic carrying capacity on the stack port of each stackable switch element; And such logic, it is operable as response and determines to have losing of control and management traffic carrying capacity on the stack port of the concrete switch element of network node, be used for the user data service amount on the stack port of the concrete switch element of deexcitation, to avoid the loop situation of the user data service amount that relates in network.
Description of drawings
Can obtain understanding more completely of the present invention in conjunction with the drawings with reference to the following detailed description, wherein:
Fig. 1 is an exemplary ethernet environment, has to pile up Ethernet switch system (SESS), wherein can realize embodiments of the invention;
Fig. 2 is a block diagram according to the Ethernet slot/element among the exemplary SESS of Fig. 1 of an embodiment;
Fig. 3 A and 3B are the flow charts about the function of SESS according to an embodiment; And
Fig. 4 is the flow chart about the embodiment of the disclosed loop prevention scheme of this patent.
Embodiment
To can bestly make with reference to how and use the various examples of embodiment to describe embodiments of the invention.Run through to describe with several views of accompanying drawing and use identical reference number to indicate similar or corresponding part, wherein each element does not need to draw in proportion.Specifically with reference to figure 1, it shows an exemplary ethernet environment 100 now, has and can pile up Ethernet switch system (SESS) 102, wherein can realize embodiments of the invention.When beginning, should be realized that any known or unknown so far Ethernet realization of ethernet environment 100 representatives, wherein have well-known layer 2 or layer 2/3 function, perhaps the one or more ethernet nodes according to any other higher functions of OSI(Open Systems Interconnection) model are interconnected in a communication network.Therefore, for example, ethernet environment 100 can be the Local Area Network that is operating as the enterprise-level network, customer rs premise net etc.As further illustrating, network environment 100 can be presented as that two hosts (dual-home) or many hosts (multi-home) use.In embodiment further, ethernet environment 100 can comprise that Metro Ethernet or Access Network realize.
A plurality of Ethernet switch element 106-1 to 106-N (being also referred to as slot or stacked switch) form SESS 102, and it is operating as a scalable network node of the core switch 104 that is connected to ethernet environment 100.About configuration, slot 106-1 to 106-N can organize becomes " the piling up " with any suitable topology, and described topology is chain topology, ring topology or Star topology for example, interconnects with piling up link 105.Each slot or switch element can be supported a plurality of ethernet ports, so that the network connectivty between these slots, network connectivty with other network nodes and/or equipment and core switch 104, in one implementation, this core switch 104 can be another Ethernet switch.Therefore, for purpose of the present disclosure, the ethernet port of stacked switch element can divide into groups to become three classes: (i) one or more core switch (" CS ") port is operable as via separately core switch and connects and each stacked switch element is connected to core switch 104; (ii) one or more stack ports are operable as and realize that a plurality of switch element 106-1's to 106-N of interconnection piles up link 105; And (iii) one or more ports, be operable as the connectedness of supporting with other network elements, node and/or equipment.As shown in Figure 1, reference number 110-1 to 110-N refers to respectively and N the corresponding CS port of switch element that wherein a plurality of switch element 106-1 to 106-N connect 107-1 to 107-N via core switch and are connected to core switch 104.Show a pair of stack port with respect to each switch element, for example at the port one 08-A (1) of switch element 106-1 and 108-B (1), at the port one 08-A (2) of switch element 106-2 and 108-B (2) or the like, to realize piling up link 105, wherein this piles up link 105 and can realize with the configuration of twisted-pair cable or optical cable.Similarly, each switch element also provides a large amount of network ports, for example, and at the port one 12-K (1) of switch element 106-1, at port one 12-K (2) of switch element 106-2 or the like.Person of skill in the art will appreciate that to have identical port number, in any specific implementation, and need not be this situation although each switch element is exemplified as.
As the front indication, in a preferred embodiment, stacked switch element 106-1 to 106-N is operable as and is suitable for locating protocol Data Unit (PDU) (being preferably frame and grouping) carried out in the defined layer of OSI Reference Model 2 (data link layer) and layer 3 (network layer) exchanging and the multilayer switch of routing operations, although they can also execution level 4-7 swap operation.In addition, each switch element can be worked usually and is independently bridge, switch or router.But, providing under the integrated situation of piling up manager agreement (ISMP), stacked switch element 106-1 to 106-N cooperates jointly, to imitate the single switching node more powerful than the simple set of the individual switch element in the independent operation.Resulting SESS node 102 is preferably suitable for providing a scalable network ability of the fault-tolerant and user friendliness with enhancing.Particularly, SESS 102 can dynamically expand to incorporate other stacked switch element into, the stacked switch that detection can not be operated and pile up link, (sometimes by this stacked switch that can not operate) route around the stacked switch that can not operate dynamically, and automatically the configuring stacking switch element is to produce not redundant identifying schemes, so that transmit operation between stacked switch.
Fig. 2 is the block diagram according to the Ethernet slot/element among the exemplary SESS 102 of Fig. 1 of an embodiment.This exemplary slot 200, be operable as any stacked switch element 106-1 to 106-N of SESS 102, comprise one or more Network Interface Modules (NIM) 204 (i), one or more exchange control unit (that is, network processing unit) 206 and administration module 220, preferably all these common cooperations are with via a plurality of ethernet ports 202 (i), i=1,2,3 ..., M receives and to enter data business volume and the transmission data business volume of going out.For the purpose of this embodiment, each of a plurality of ports 202 (i) can be considered to be suitable for receiving the duplex port that enters data and send the data of going out.In addition, port 202 (i) is represented three types ethernet port, comprises above with reference to figure 1 described stack port and CS port.Therefore, it is contemplated that then this port can transmitting user data traffic carrying capacity and control and management traffic carrying capacity if concrete port 202 (i) is operable as stack port.
NIM element 204 (i) preferably includes one or more physical layer interfaces and media interviews control (MAC) interface, and it is suitable for exchanging for example PDU of ethernet frame and IP grouping via suitable wired or wireless network communication link (not shown).The NIM that is associated with the port that is operable as stack port for example be suitable for according to the stack arrangement pattern with communicate by letter between other stacked switch pile up, and with various compatible node switching traditional data traffic carrying capacitys, and the exchange PDU standard ethernet NIM.By means of one or more data/address bus 205A that enter, enter PDU and be sent to network processing unit/controller 206 from a plurality of NIM.Similarly, via one or more data/address bus 205B that go out, the PDU slave controller 206 of going out is transferred to a plurality of NIM.
In one implementation, administration module 220 generally includes policy manager 224, is used for keeping and realizing the traffic carrying capacity strategy.The strategy of being realized by policy manager 224 preferably is based in part on the layer 2 derived and/or layer 3 addressing information from the learning manipulation of source, from routing iinformation that other routing devices received and the filtering rule that uses Simple Network Management Protocol (SNMP) message 226 for example to upload by network manager via configuration manager.The traffic carrying capacity strategy of being derived from source study, other network nodes and manager is for being available by network processing unit 206 performed routing engines 230, and by transmitting 254 expressions jointly.
Except the traffic carrying capacity strategy, administration module 220 also comprises port/pile up administration module (PSMM) 210, and that more specifically describes below being used to realize piles up function for monitoring and port status management function.PSMM 210 preferably includes port status monitor module 212 and piles up manager 214.Port status monitor module 212 is suitable for using the control traffic carrying capacity signal that for example keeps active (Keep-Alive) signal to monitor the mode of operation of stack port, and discerns the appearance of neighbours' stacked switch of the stack port that is connected to switch element 200.PSMM 210 in a preferred embodiment can also comprise and pile up manager 214, and it is suitable for participating in determining the selection of the management responsibility of each stacked switch; Processing is used to monitor the supervision message of the state of other switch element; And if desired, then as elementary host exchange (PMS) or secondary host exchange (SMS), its responsibility can comprise distributes to one or more stacked switch with distinctive element identifier symbol, and processor identifiers is distributed to its network processing unit.In addition, pile up manager 214 and be suitable for determining the stacked switch topology, and handle the relevant message of topology that between the stacked switch element of SESS 102, exchanges.Particularly, pile up manager 214 and send the SESS topology request, send known SESS topology information to other stacked switch, and keep one or more local topology tables.In certain embodiments, port status monitor 212 and the function of piling up manager 214 can also comprise the losing of detecting element, the insertion of element in addition (causing trap (trap) or unusual the generation), the removal of element from piling up, and the built-in function state of definite PSMM.
In addition, the manager 214 that piles up is in a preferred embodiment kept and is upgraded one or more stacked switch neighbor table 218, and preferably one is associated with each stack port.Neighbor table 218 is the tabulations by accessibility those stacked switch of stack port that are associated.In one implementation, enumerate neighbours' stacked switch with switch element and the port next-door neighbour's who at first lists order.As previously described, each element can provide two stack ports.Therefore, each stack port of switch element 200 keeps independent neighbor table 218, and it is listed by accessibility all the neighbours' stacked switch of this stack port.As a result, if the topology of SESS 102 is a loop configurations, then two neighbor table 218 all have identical neighbours' stacked switch tabulation, but reversed in order.
Continuation is with reference to figure 2, network processing unit 206 can but the layer 2 and layer 3 swap operation that are not limited in OSI Reference Model, define.The example that is used for operationally port 202 (1) to 202 (M) being connected to the layer 2 protocol of wired and/or wireless communication link separately comprises IEEE (IEEE) 802.3 and IEEE 802.11 standards.Similarly, the example of layer 3 agreement is included in the IP version 6 of Internet protocol (IP) edition 4 of definition in the Internet engineering duty group (IETF) Request for Comment (RFC) 791 and definition in IETF RFC 1883.
Network processing unit 206 preferably includes routing engine 230 and queue management device 240.In an exemplary realization, routing engine 230 comprises grader 232, it receives from data/address bus 205A and enters PDU, check one or more fields of PDU, use Content Addressable Memory (CAM) 233 that PDU is categorized into of a plurality of streams, and transmitting from be stored in memory fetched forwarding information in 254.Preferably include but be not limited to flow identifier from transmitting the forwarding information of fetching 254, it is used to specify those and prepares the concrete PDU needed forwarding operation that is used to go out, and wherein flow identifier can comprise next hop address and type service (CoS) or service quality (QoS) regulation.Forwarding processor 234 receives the PDU that enters with forwarding information of being associated, and carries out one or more forwardings and operate before being transferred to suitable one or more outer outbound port.Transmit that operation preferably includes but the conversion that is not limited to be used for again encapsulation of data, be used for one or more VLAN labels are appended to the VLAN label press operation (pushing) of PDU, be used for removing the VLAN label push operation (poping) of one or more VLAN labels from PDU, be used to keep the QoS management of Internet resources, be used to monitor the charging and the book keeping operation of client traffic, the selective filter of multiprotocol label switching (mpls) management, PDU, access control, comprise the high level study of ARP(Address Resolution Protocol) control, or the like.
After being handled by forwarding processor 234, PDU is delivered to queue management device 240, and is stored in wherein, can be used for PDU is transferred to suitable outer outbound port up to bandwidth.Particularly, the PDU that goes out cushions in one or more priority formations of buffer 242, outbound port outside they are transferred to via data/address bus 205B by scheduler 244.The other details that realizes about network processing unit can find in one or more common all co-pending patent applications of above cross reference.
Fig. 3 A and 3B are the flow charts about the function of SESS according to an embodiment.As shown in Figure 3A, according to known procedures initialization SESS node (frame 302), for example, have the SESS 102 of the stacked switch element 200 of above detailed description, set up the port topology of SESS (frame 304) so respond the execution of suitable Spanning-Tree Protocol (STP).In addition, the state information of each port among the SESS comprises the CS port that is connected to core switch, is assigned with and assigns (frame 306).When suitably configuration and initialization, guarantee that at least one CS port of SESS is in blocked state, and other CS ports are in forwarding state, thereby make when SESS quilt at first when online (brought online), avoided the loop (frame 308) of data business volume.
Under the situation of losing that has the control and management traffic carrying capacity on the stack port of the stacked switch element of SES S (frame 350), STP handles and detects change in topology (frame 352).Under a large amount of situations even connect the piling up under the situation about remaining unchanged on the link physical of stacked switch element, can cause this loss situation: (i) network processing unit of neighbours' stacked switch element may malfunction or fault is arranged; (ii) neighbours' stacked switch element may be restarted inadequately; And/or (iii) there is some abnormal case about the application-specific integrated circuit (ASIC) (ASIC) of neighbours' stacked switch element.Response detects topology change, and the STP that is associated with SESS handles all CS ports are become forwarding state.That is, even make the port that is initialized as blocked state become forwarding state.As a result, produced the loop situation in ethernet environment, it can cause data business volume flood (flooding).
Fig. 4 is about can be with the flow chart of the embodiment of the disclosed loop prevention scheme of this patent of exemplary SESS 102 operations.To recognize that the one or more steps that provide can be with software (for example in the flow chart of Fig. 4, instruction on the computer-readable medium), hardware, firmware or its any combination realize, and can be embodied in the one or more suitable box of a plurality of stacked switch elements 200 of the above SESS that has described in detail.In addition or alternatively, some steps and operation can be selectable, and therefore be not all realize and embodiment in requirement is all arranged.
The logic that is associated with the stacked switch element, particularly, after the SESS initialization, be operable as the physical state of the stack port that monitors SESS 102 at the PSMM 210 of the stacked switch element 200 shown in Fig. 2 as exemplary embodiment, thereby make when the state of stack port when DOWN changes into UP, the other port-monitoring logic that is associated with the stacked switch element be activated (frame 402).As above given, port status distributes and topological arrangement is carried out as the initialized part of SESS.When the state-transition that detects from DOWN to UP, the control on the stack port/management service amount is activated, and is monitored (frame 404) subsequently.In case guarantee to have begun suitable control traffic carrying capacity on stack port, then excited users data traffic carrying capacity is used for via the stack port transmission, as the part (frame 406) of the normal running that realizes in SESS.
By means of the logic that is associated with PSMM 210, continue to monitor the state and the situation (frame 408) of the control traffic carrying capacity on the stack port.As the stack port of concrete switch element UP but (for example do not receive control traffic carrying capacity message physically from the neighbor switch element at this port, keep alive message) time, determine to exist lose (frame 410) from the control traffic carrying capacity of neighbor switch element.In an exemplary realization, loss situation can determine based on detecting to receive to arrive over time from the maintenance alive message of neighbor switch element, this a period of time can be predetermined or can be configured to be dynamically changeable etc.Response determines to exist losing of control traffic carrying capacity on stack port, when continuation retentive control/management service amount path is open, and the user data service amount (frame 412) of deexcitation on this stack port.Therefore, the deexcitation of user data service amount is that the data loopback that prevents from wherein to be deployed with in the network environment of SESS forms on the stack port.After the suitable control traffic carrying capacity that detects on the stack port from neighbours' element (because, for example, restart by network operator or manager), can on stack port, activate again or restoring user data traffic carrying capacity (frame 414).
Think according to more than the detailed description that provides, operation of the present invention and structure are tangible.Although shown and described exemplary embodiment of the present invention are preferred, be to be understood that under the prerequisite that does not depart from the given scope of the present invention of following claim, can carry out various changes and modification.
Claims (10)
1. the loop prevention method that can in having the piled up Ethernet switch system (SESS) of at least two stackable switch elements, operate, wherein each switch element comprises at least one stack port and at least one core switch port, make described at least one core switch port be operable as and be connected to core switch, described loop prevention method comprises:
Monitor the control and management traffic carrying capacity on each described at least one stack port of described stackable switch element; And
When on the stack port of the concrete switch element of determining described SESS, having the losing of described control and management traffic carrying capacity, user data service amount on the described stack port of the described concrete switch element of deexcitation is to avoid relating to the loop situation of described user data service amount in described SESS.
2. loop prevention method as claimed in claim 1, wherein do not receive " keeping active " message, determine that the described of described control and management traffic carrying capacity on the described stack port of described concrete switch element lost from the neighbor switch element that is connected to described concrete switch element based on detecting after a period of time.
3. loop prevention method as claimed in claim 2, the wherein said time period is predetermined.
4. loop prevention method as claimed in claim 2, the wherein said time period is to change configurablely.
5. loop prevention method as claimed in claim 1 also is included in the described control and management traffic carrying capacity that detects on the described stack port when having recovered, and activates the described user data service amount on the described stack port of described concrete switch element.
6. loop prevention method as claimed in claim 1 wherein after the initial configuration of described SESS, is carried out described supervisory work, wherein when being connected to described core switch, described core switch port become one of at least blocked state.
7. loop prevention method as claimed in claim 1, the stack port traffic carrying capacity logical block by being associated with each stackable switch element wherein monitors described control and management traffic carrying capacity on each of described stackable switch element.
8. one kind can be piled up the Ethernet switch system, comprising:
At least two stackable switch elements, wherein each switch element comprises at least one stack port and at least one core switch port, makes described at least one core switch port be operable as and is connected to core switch;
With the logic that each stackable switch element is associated, be used to monitor the control and management traffic carrying capacity on described at least one stack port of each described stackable switch element; And
Be operable as response and determine on the stack port of the concrete switch element of described SESS, to exist the logic of losing of described control and management traffic carrying capacity, be used for the user data service amount on the described stack port of the described concrete switch element of deexcitation, to avoid in described SESS, relating to the loop situation of described user data service amount.
9. the Ethernet switch system of piling up as claimed in claim 8, wherein do not receive " keeping active " message, determine that the described of described control and management traffic carrying capacity on the described stack port of described concrete switch element lost from the neighbor switch element that is connected to described concrete switch element based on detecting after a period of time.
10. the Ethernet switch system of piling up as claimed in claim 8, also comprise and be used for when detecting described control and management traffic carrying capacity on described stack port and recovered, activating the logic of the described user data service amount on the described stack port of described concrete switch element.
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| CNA2006101018690A CN101312426A (en) | 2006-07-12 | 2006-07-12 | Loop preventing system and method for system of stackable Ethernet switch |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101605131B (en) * | 2009-07-17 | 2012-02-08 | 杭州华三通信技术有限公司 | Method for updating topological path in stack system, stack system and stack equipment thereof |
| CN107104856A (en) * | 2017-05-08 | 2017-08-29 | 北京北信源软件股份有限公司 | A kind of HUB device identification methods and device |
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2006
- 2006-07-12 CN CNA2006101018690A patent/CN101312426A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101605131B (en) * | 2009-07-17 | 2012-02-08 | 杭州华三通信技术有限公司 | Method for updating topological path in stack system, stack system and stack equipment thereof |
| CN107104856A (en) * | 2017-05-08 | 2017-08-29 | 北京北信源软件股份有限公司 | A kind of HUB device identification methods and device |
| CN107104856B (en) * | 2017-05-08 | 2019-07-30 | 北京北信源软件股份有限公司 | A kind of HUB device identification method and device |
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