CN100521638C - Intersecting Ethernet ring net and its automatic protecting method, node device for Ethernet ring net - Google Patents
Intersecting Ethernet ring net and its automatic protecting method, node device for Ethernet ring net Download PDFInfo
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Abstract
The invention relates to a method for protecting crossed Ethernet network, wherein said network is arranged with quick annular network protective region; said region comprises a main ring and a sub ring; main ring is the virtual main node of sub ring; the main ring via the first and second edge nodes is crossed with sub ring; the port of first edge node connected to the sub ring is the first port of virtual main node; the port of second edge node connected to the sub ring is the second port of virtual main node. And said method comprises following steps: setting the second port of virtual main node as transfer mode; the first port of virtual main node is block mode; checking if the sub ring has chain accidence; if it is, setting the first port of virtual main node as transfer mode, and initializing the refresh transfer list information; when the accidence of sub ring is recovered, setting the first port of virtual main node as block mode, to initialize the refresh transfer list.
Description
Technical field
The present invention relates to field of network data transmission technology, particularly relate to a kind of interworking Ethernet ring network and automatic protecting method thereof and looped network node equipment.
Background technology
Along with progressively the popularizing and using of ethernet ring network, the user is also more and more higher to the demand of the performance of ethernet ring network and scale.The application of ethernet ring network at present, performance and scale that Spanning-Tree Protocol STP (Spanning Tree Protocol) family provides can not satisfy the demand of ethernet ring network.STP (Spanning TreeProtocol) can provide path redundancy, uses STP to make and have only an active path in two terminals.STP has defined a tree in big network, and forces certain backup path to be in stand-by state.If a network part that generates in the tree is unreachable, perhaps STP path cost value has changed, and spanning tree algorithm can recomputate spanning-tree topology, and rebulids connection by starting backup path.So STP can prevent data loopback by the blocking-up redundant link, and can provide high availability by enabling the standby redundancy link.But when change in topology appears in looped network, link failure has for example appearred, Spanning-Tree Protocol STP needs second time of level to recomputate spanning-tree topology and recovers fault, and such speed is too slow and can't be suitable for for present local area network (LAN) (LANs) and metropolitan area network (MANs).And Spanning-Tree Protocol can only be supported the network of certain scale, if the looped network scale is excessive, the performance of Spanning-Tree Protocol increases with interstitial content especially and descends.
The new method of the quick protection when having proposed some in the prior art and breaking down at looped network has proposed the new approaches of quick protection when some looped networks break down respectively.For example; Chinese patent CN200410078235.9 application documents disclose the implementation method that protection is switched in a kind of looped network; this method comprises: the protection passage of setting up the M bar in looped network for N bar service aisle; and 1＜=M＜=N; when service aisle to be protected occurring between the network node in the looped network; the operating position and the protocol signaling transmission of the protection passage of preserving by this locality determine to use the minor axis or the major diameter of a certain protection passage in the M bar protection passage between the described network node that service aisle to be protected is protected.Chinese patent CN02130098.4 application documents disclose a kind of fast replacing method of RPR network: after optical fiber breaks down, two nodes at fault optical fiber two ends enter around pattern, simultaneous faults optical fiber two end nodes send broadcast packet at outer shroud and other node of interior hoop respectively, the position of notifying other node failure to take place, after other node receives the broadcast packet that contains fault message on the looped network, reselect the sending direction of data flow according to the abort situation of looped network.More than two kinds of technical schemes that realize the fast looped network protection owing to all need to redefine the transmit path of data flow, and the spent time of this calculating be growing local area network (LAN) (LANs) and metropolitan area network (MANs) unacceptable; And, when all not relating to a plurality of looped networks in above-mentioned two pieces of files and intersecting and break down and how to protect fast, guarantee the correct technical scheme of transmission of data.
United States Patent (USP) the 6th, 766, No. 482 application documents disclose the automatic resist technology of a kind of ethernet ring network, by an EAPS territory (EAPS Domain) is set, all nodes on the ethernet ring network belong to an EAPS territory, and wherein EAPS is writing a Chinese character in simplified form of Ethernet Automatic Protection Switching; Host node is by the generation and the disappearance of polling mechanism (Polling Mechanism) and alarming mechanism (Alert Mechanism) fast detecting loop; If produced loop, host node will block second port; If the Ethernet ring fault disappears, host node will be opened second port.Such scheme can be realized quick topological convergence, but such scheme is merely able to be applicable to the situation of single looped network, and in the actual networking application, all is that a plurality of looped networks intersect formation.So, how to use a kind of simple and effective mechanism to guarantee the transmission of data, the various performances of this interworking Ethernet ring network have good performance again simultaneously just becomes the technical problem that those skilled in the art press for solution.
Summary of the invention
In view of the above problems; technical problem to be solved by this invention provide a kind of interworking Ethernet ring network with and guard method; providing high-performance (failure recovery time short) and to interstitial content under insensitive prerequisite; when the intersecting ring network operate as normal, prevent to form data loopback; redundancy backup and fast quick-recovery are provided during network failure, only support the defective of simple topologys such as monocycle and tangent rings to solve the existing automatic resist technology of looped network.
For solving the problems of the technologies described above, the invention provides a kind of guard method of interworking Ethernet ring network, in described interworking Ethernet ring network, be provided with the fast looped network protected field, described fast looped network protected field comprises main ring and subring, wherein main ring is as the virtual host node of subring, main ring passes through first fringe node and second fringe node and subring and intersects, the port that first fringe node links to each other with subring is first port of virtual host node, the port that second fringe node links to each other with subring is second port of virtual host node, said method comprising the steps of: second port that virtual host node is set is a forward mode, and first port of virtual host node is a blocking model; Detect described subring whether link failure takes place, if, then; First port of virtual host node is made as forward mode, and initiates to refresh to transmit notice.
Preferably, the guard method of described interworking Ethernet ring network also comprises: recover when described subring ring network fault, then first port with virtual host node is made as blocking model, and initiates to refresh to transmit notice.
Preferably, the guard method of described interworking Ethernet ring network also comprises: described main ring comprises a host node, and during the main ring operate as normal, the master port of main ring host node is set to forward mode, and secondary port is set to blocking model; If detect described main ring generation link failure, then the secondary port with the main ring host node is made as forward mode, and initiates to refresh to transmit notice.
Preferably, the step whether described detection subring link failure takes place comprises: second fringe node periodically sends probe messages by subring to first fringe node from second port, in the given time, first port of virtual host node is not received probe messages, then thinks to detect the subring link failure; Perhaps, second fringe node detects its subring direct connected link and breaks down, and notifies first fringe node; Perhaps, the transmission node of subring detects the fault of its direct connected link, directly reports first fringe node; Perhaps, the transmission node of subring detects the fault of its direct connected link, reports second fringe node, notifies first fringe node by second fringe node.
The present invention also provides a kind of interworking Ethernet ring network, in described interworking Ethernet ring network, be provided with the fast looped network protected field, described fast looped network protected field comprises main ring and subring, wherein main ring is as the virtual host node of subring, main ring passes through first fringe node and second fringe node and subring and intersects, the port that first fringe node links to each other with subring is first port of virtual host node, and the port that second fringe node links to each other with subring is second port of virtual host node; When group loop chain road was normally moved, second port of virtual host node was a forward mode, and first port of virtual host node is a blocking model; When link failure was given birth in the group environment-development, first port of virtual host node was transformed to forward mode, and refreshes transmitting of main ring and each node of subring.
Preferably, described interworking Ethernet ring network also comprises: when the subring ring network fault was recovered, first port of virtual host node was transformed to blocking model, and refreshed transmitting of main ring and each node of subring.Preferably, also comprise other nodes on the main ring of two fringe nodes of connection and the arbitrary paths in the subring.
Preferably, described main ring comprises a host node, and during the main ring operate as normal, the master port of main ring host node is a forward mode, and secondary port is a blocking model; When main ring generation link failure, the secondary port of main ring host node becomes forward mode by blocking model, and initiates to refresh to transmit notice.
Preferably, described interworking Ethernet ring network also comprises at least one node device, and this node device is positioned on the main ring, and described main ring and subring are intersected by two nodes, and described main ring is as the virtual host node of subring; Described node device is used for the protocol massages of transparent transmission subring, and handles refreshing of subring and transmit message.
The invention also discloses a kind of node device of interworking Ethernet ring network, described node device connects at least one main ring and at least one subring, described main ring and subring also intersect at another node device, described main ring is as the virtual host node of subring, and this virtual host node is protected automatically to this interworking Ethernet ring network; When subring normally moved, the port that described node device links to each other with subring was a blocking model; When this subring link occurs fault, described node device is transformed to forward mode with described port by blocking model, and initiates to refresh to transmit notice.
Preferably, described node device also comprises a delay timer, if in preset time, does not receive the probe messages of another crossing node of described main ring and subring along the path transmission of described subring, then thinks to detect this subring link occurs fault.
The present invention also provides a kind of node device of interworking Ethernet ring network, described node device connects at least one main ring and at least one subring, described main ring and subring also intersect at another node device, described main ring is as the virtual host node of subring, and this virtual host node is protected automatically to this interworking Ethernet ring network; Described node device periodically sends probe messages along the path of described subring to another node device that described main ring and subring are intersected.
The present invention also provides a kind of node device of interworking Ethernet ring network, and this node device is positioned on the main ring, and described main ring and subring are intersected by two nodes, and described main ring is as the virtual host node of subring; Described node device is used for the protocol massages of transparent transmission subring, and handles refreshing of subring and transmit message.
Compared with prior art, the present invention has the following advantages:
The invention provides the Ethernet ring protection technical scheme of a kind of high-performance, low price, easy expansion, this technical scheme can prevent data loopback by the blocking-up redundant link; And can provide high availability by enabling the standby redundancy link.
Be provided with the fast looped network protected field described in the present invention in the interworking Ethernet ring network, comprise at least one main ring and at least one subring in this territory, wherein main ring is as the virtual host node of subring, main ring passes through first fringe node and second fringe node and subring and intersects, the port that first fringe node links to each other with subring is first port of virtual host node, the port that second fringe node links to each other with subring is second port of virtual host node, said method comprising the steps of: looped network is provided with virtual host node when normally moving second port is a forward mode, and first port of virtual host node is a blocking model; Detect described subring whether link failure takes place, if, then; First port of virtual host node is made as forward mode, and refreshes transmitting of interior each node of described fast looped network protected field.This intersecting ring network configuration is simple; the host node of main ring as subring is configured; finish detection and recovery jointly by first fringe node and second fringe node to the subring fault; single net by main ring self detects, recovering step realizes the fast automatic protection to main ring, thereby realizes the protection of the intersecting ring network that is made of this main ring and subring.Said method looped network layoutprocedure is simple, be easy to realize, detect recovery process simple, can effectively improve the efficient of recoverys, detection.
The present invention carries out link failure detection in the looped network by the combination of following multiple mode, can improve the speed of link failure detection.Described detection mode comprises: first fringe node sends the mode of probe messages, the mode that each node detects the direct connected link fault voluntarily.And pass through two paths of each node detection after the fault send notice to first fringe node and second fringe node, can further improve speed.The present invention can obtain the quick topological convergence suitable with SONET (link of 50ms or node failure recovery time); And have extendible network size (failure recovery time is to looped network scale-interstitial content--insensitive) and can support more complicated phase cross ring topology.
Each node detection in the intersecting ring network of the present invention can also take to block measure temporarily after its direct connected link recovers, to prevent the appearance of temporary loop.Receive the notification message that looped network recovers when described forward delay timer expiry or this node, then the port of described obstruction is moved to forwarding state.
Adopt guard method of the present invention, when Single Point of Faliure occurring in main ring or the subring, only need finish topological convergence in monocycle separately and get final product, implementation is simple and convenient; And it is protect process automatically, so minimum to the stable operation influence of double layer network owing in monocycle separately, finish fault.
In a word, in the network of forming by two or more looped networks, the present invention can prevent to form data loopback when the network operate as normal, can provide the technology of redundancy backup during network failure, and the present invention can provide higher performance, shorter failure recovery time and better structure expansion (insensitive to interstitial content).
Description of drawings
Fig. 1 is the schematic diagram with single ethernet ring network of fast automatic defencive function;
Fig. 2 is the schematic diagram with interworking Ethernet ring network of automatic protection functions;
Fig. 3 is the schematic diagram that intersecting ring network shown in Figure 2 is carried out the specific embodiment of fast automatic protection;
Fig. 4 is the schematic diagram that intersecting ring network shown in Figure 2 is carried out another specific embodiment of fast automatic protection;
Fig. 5 is the schematic diagram that three looped networks are formed interworking Ethernet ring network;
Fig. 6 is another kind of interworking Ethernet ring network topology schematic diagram;
Fig. 7 is an intersecting ring network main ring shown in Figure 5 schematic diagram when link failure occurring.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Core concept of the present invention is: on single looped network can the basis of fast automatic protection; each node device on the looped network is configured and improves; certain monocycle is set to the virtual host node of other looped networks; so that inherit every advantage of original monocycle looped network protection agreement; can be fast, simply the intersecting ring network fault is detected and recovers, obtain a kind of Hierarchical network of easy expansion.When two looped networks intersected, two node devices that connect these two looped networks can appear.For convenience of description, be referred to as first fringe node and second fringe node, two crossing looped networks are referred to as main ring and subring respectively.One of improvement of the present invention is: the port that first fringe node links to each other with subring is blocking model when the subring link normally moves; When break down in group loop chain road, first fringe node will become forward mode by blocking model with described port, and refresh and transmit.Second fringe node sends probe messages by the path of above-mentioned subring; And, when second fringe node is learned the subring link occurs fault, send and notify first fringe node to open the message of its port.
At first the situation that single ethernet ring network among the present invention is carried out fast automatic protection describes.With reference to Fig. 1, for having the single ethernet ring network of fast automatic defencive function.
Shown in ethernet ring network comprise host node, can also comprise transmission node, described host node and transmission node can be commonly referred to as node.Node can be switch or router, and two ports on every switch are connected to the port on other switches, and the rest may be inferred, and linking to each other by port between each node forms ring, and each node comprises two ports that are connected on the ring; All nodes on the ring all belong to a quick Ethernet ring protection territory, move RRPP (Rapid Ring ProtectionProtocol) rapid ring protection protocol on described quick Ethernet ring protection territory, so described protected field is called RRPP domain.Certainly, also can adopt other similar looped network protection agreements to realize the automatic protection of Single-ring network, this specification is because the length restriction only adopts the RRPP agreement to describe.
In described quick Ethernet ring protection territory, host node is set as blocking model to one of them port, and another port is set as forward mode.On host node or the transmission node (supporting the equipment of RRPP) one or more than one RRPP domain can be set, certainly, a plurality of Virtual Local Area Network can be set in each RRPP domain yet, the present invention is not limited this.
A host node 4 and five transmission nodes have been shown in the quick Ethernet ring protection territory shown in Figure 1, have been respectively transmission node 1,2,3,5 and 6.Each host node and transmission node all have a forwarding database, store the transmission path information of data message in looped network.Looped network shown in Figure 1 is complete, link failure does not promptly appear, data message and protocol massages transmit by the master port 41 of host node, host node is set as blocking model (adopting the circle of filling to represent) with secondary port 42 in Fig. 1, make data message not transmit, thereby can prevent the appearance of broadcast storm by this pair port 42.But described secondary port 42 is a blocking model, only is passing through of blocking data message, does not block passing through of protocol massages, and protocol massages also can be forwarded at the secondary port of blocking model.The master port 41 of host node is set as forward mode, secondary port 42 is set as blocking model and the guarantee agreement message still can pass through.This process is known for persons skilled in the art, just the technology of this setting is not realized further having set forth at this.
In order to realize avoiding the function of data loopback and redundant link backup; and provide the automatic protective value (convergence time short) of higher degree; shown in fast the Ethernet ring protection territory can a Virtual Local Area Network 1 be set at protocol massages; at data message a Virtual Local Area Network 2 is set; the fault of looped network shown in knowing by the transmission of protocol massages among the described VLAN1; comprise link failure or node faults itself (for example, node port can't be worked).Certainly, looped network shown in also can by access control list ACL (access control list), forwarding-table item or simultaneously the VLAN of retransmission protocol message and data message know link failure.Described data message and protocol massages can transmit in same VLAN, promptly need a special control VLAN be set at protocol massages, thereby can save the VLAN ID resource of node.
The mode that the fault detect of described looped network can be by node detection initiatively reports during to link failure or the mode of host node poll looped network state detect to be known.Host node and transmission node can directly detect oneself, and any one belongs to the direct connected link fault of the port of RRPP domain.Host node 4 can also judge whether there has been link failure in the described RRPP domain by the mode of poll (polling) looped network state.
When transmission node detect own any one when belonging to the direct connected link fault of port of RRPP domain, then send link failure message to host node.When the link between node 1 and 2 broke down, transmission node 1 that the two ends, fault point are adjacent and transmission node 2 all passed through another port and send link failure message to host node, from the both direction notice host node of looped network.
The technical scheme that host node is carried out poll looped network state describes in detail below:
When described looped network does not have link failure, be that looped network is when being complete, the probe messages that host node 4 sends from master port 41 can be received from the secondary port 42 of host node 4 in message receives time period of timer setting, then host node 4 just knows that described looped network is complete, reset message and receive timer, and the transmission probe messages of hold period.
When link failure appears in described looped network, be that opening circuit has appearred in looped network, the probe messages that host node 4 sends from master port 41 can't be received from the secondary port 42 of host node 4 in message receives time period of timer setting, promptly still do not receive probe messages before message receives timer expiry, then host node 4 judges that link failure has appearred in described looped network.
In order to improve the forwarding speed of described probe messages, transmission node is after the port on the ring receives probe messages, and the port that encircles from its another forwards earlier, and this transmission node is handled the information that this message carries again then.Can obtain forwarding speed faster like this, can reduce from fault occurring to the time that host node is known, along with the difference of port speed, forwarding speed also can change thereupon certainly, but the technical program can obtain forwarding speed faster under the same conditions.
More than single ring network fault detected be described, below to knowing that the recovery process after the link failure is described:
When knowing link failure, host node 4 recovers secondary port 42 to transmit, and refreshes transmitting of host node and transmission node; Thereby make still only to have a cut-off point in the described looped network, can not form isolated island, can guarantee the continuation transmission of data message, just can finish the fault conversion in a short period of time, the fast automatic protection of realization looped network.
When host node 4 knows that link failure appears in described looped network,, and cause ring to go up each node refreshing and transmit (forwarding database) from 4 two ports of host node 41,42 issue malfunctions notice; Whether host node 4 is proceeded poll looped network state, detect looped network and recover.If host node 4 is recovered to the probe messages of transmission from secondary port 42, think that then link failure recovers, host node 4 blocks the secondary port 42 of host nodes, and refresh host node and transmission node on the looped network transmit (forwardingdatabase), issue looped network good working condition notice.
The time point that recovers from the port of the generation link failure of transmission node 1 or 2 is found time point that loop network links regain one's integrity to host node 4, because generally can there be certain time interval in the forwarding of probe messages.If the port of the generation link failure of interior during this period of time transmission node 1 or 2 is a forwarding state, then can form a temporary loop, because the secondary port 42 of host node 4 is still in forwarding state at this moment, and the port of the generation link failure of transmission node 1 and 2 also is in forwarding state, so data message can all be transmitted, thereby form temporary loop on the port in the ring.In order to prevent the generation of temporary loop, when transmission node 1 or 2 finds that oneself port that belongs to RRPP domain recovers, (allow protocol massages to pass through its obstruction, the blocking data message) or keep blocked state (for example, when the port failure of this both link ends, just it being changed to blocked state); And can start a forward delay timer.
When transmission node 1 or 2 received the notification message that host node 4 sends, described transmission node 1 or 2 determined oneself whether the port of blocking data message is arranged, if exist, then makes this port move to forwarding state by blocked state.Determine whether transmission node has the port that is in the blocking data message status, the sign of this port that can store when transmission node is provided with this port block state is judged, also can directly inquire about the state of this node two ports on ring and can determine.
When transmission node detects the forward delay timer expiry of its startup, then the port that transmission node blocks can be moved to forwarding state by blocked state.
With reference to Fig. 2, for having the interworking Ethernet ring network of automatic protection functions.
Ethernet ring network shown in Figure 2 has represented that two looped network R1 and R2 are in the same place by node S3 and node S5 are crossing, make data to transmit between looped network R1 and R2.In actual applications, adopting a ring to finish actual communication task and seldom use, is inevitable so looped network intersects.So in front to after the transfer of data of single looped network and fault detect, the recovery situation explanation, the transfer of data situation after below by Fig. 2 simple two looped networks being intersected describes.
General data communication network framework all comprises core layer, convergence-level and Access Layer, and we suppose that the looped network R1 in the intersecting ring network shown in Figure 2 is positioned at convergence-level, and looped network R2 is positioned at Access Layer.Below looped network R1 is called main ring R1, it is that example describes that looped network R2 is called subring R2, is not limited in application like this certainly.
Be provided with the fast looped network protected field in intersecting ring network shown in Figure 2, this fast looped network protected field covers main ring R1 and subring R2.Certainly, described fast looped network protected field can also comprise a plurality of main rings and a plurality of subring, for convenience of description, only shows a main ring and a subring among Fig. 2.
As shown in Figure 2, main ring R1 has two port P1, P2 to insert subrings during as the node of subring R2, is referred to as edge port.Node S3, the S5 at two port places are referred to as fringe node, and main ring R1 can be called a dummy node of subring.In intersecting ring network shown in Figure 2, also comprise node S4 between fringe node S3, the S5, for the present invention, between fringe node S3, S5, have or do not exist other nodes, it all is feasible having one or more other nodes, and the present invention is not limited this.Fringe node S3, S5 can realize the transmission of data by existing exchange, route technology; Be not described in detail in this.
In order to express easily, in this manual, because main ring R1 as the virtual host node of subring R2, then can be called the port P1 on the S3 first port of (R1 is R2's) virtual host node, the port P2 on the S5 is called second port of (R1 is R2's) virtual host node.Relative other ports, two ports of P1, P2 are commonly referred to as edge port, and other ports on fringe node S3, the S5 are called public port G, and as shown in Figure 2, public port G comprises G1, G2, G3, G4.In order to express easily, in this manual, node S3 is called the first fringe node S3, node S5 is called the second fringe node S5, difference nominally only is for the convenience in illustrating, has the different functions and the division of labor for the two is described; Second fringe node can be used for periodically sending probe messages and notify first port of virtual host node to be transformed to forward mode by blocking model.In the present invention, any one fringe node all is an acceptable as second fringe node or first fringe node.Described fringe node can also can be transmission node equipment for host node equipment.
Main ring R1 comprises node device S1, S2, S3, S4, S5 and S6, and wherein node S1 is the host node of main ring R1, and the host node S1 of main ring R1 comprises master port p11, secondary port p12.When main ring R1 was complete, the secondary port p12 of the host node S1 of main ring R1 was a blocked state, and described blocked state is: allow the protocol massages of main ring R1 to pass through, block the data message of main ring R1, block data message and the protocol massages of subring R2.Fault detect in the main ring gets final product with the fast protection method that recovers still to adopt prior figures 1 described list to net; if detect described main ring generation link failure; then the secondary port with the main ring host node is made as forward mode, and refreshes and transmit, and no longer describes in detail at this.
Subring R2 comprises main ring R1 and node device S7, S8 and S9, wherein, node S7, S8 and S9 are transmission node, the port that the second fringe node S5 links to each other with subring is the second port P2 of virtual host node, and the port that the first fringe node S3 links to each other with subring is the first port P1 of virtual host node; Described main ring R1 is virtual to be the host node of subring R2.When subring R2 normally moved, the second port P2 of virtual host node was a forward mode, and the first port P1 of virtual host node is a blocking model.Described blocked state is: allow the protocol massages of subring R2 to pass through, block the data message of subring R2.
In the application of ethernet ring network of the present invention, the protocol massages of main ring is only transmitted on main ring, and the protocol massages of subring can all be transmitted on subring and main ring, is not restricted to this certainly.Below, the present invention only describes with this situation.When the two intersects laggard line data transmission as main ring R1 and subring R2; the situation that transmission fault brought is just more complicated more than the situation of monocycle; in order still can fast automaticly to protect, then the method for the process of transfer of data and fault detect will be different, below this described in detail.
For interworking Ethernet ring network shown in Figure 2, when whole looped network all runs well, the secondary port p12 of the host node equipment S1 of main ring R1 is blocked state (the control message of data message and subring R2 all can not pass through the secondary port p12 of the host node equipment S1 among the main ring R1, but the master control message can pass through the secondary port p12 of the host node equipment S1 of main ring R1); For subring R2, the second port P2 of virtual host node is a forward mode, and the first port P1 of virtual host node is a blocking model.
Described link failure can comprise three kinds of situations in fact: link failure, node device faults itself or node port fault, but be reflected into looped network, actual result can think link failure, so for convenience of description, adopt link failure to replace above-mentioned three kinds of faults to narrate among the present invention.
Detection to fault describes below:
Intersecting ring network shown in Figure 2 can be carried out the detection of the link failure of subring R2 by the independent or arbitrary combination of following several modes.
First kind, the second fringe node S5, the first fringe node S3 can detect its direct connected link fault voluntarily.The mode that adopts node directly to detect can be the fastest the direct-connected link failure of this node of discovery, described link failure can show as: the optical fiber of node interconnection occur rupturing grade cause data can't transmit or the port of this node can not transmit data, the port failure of adjacent node or adjacent node fault or the like situation.When the first fringe node S3 finds the direct connected link fault of its subring, also can think first port of the first fringe node S3 can be made as forward mode by the link failure that has detected subring; But because the temporary loop and the other problems that may occur when considering failback, so preferred, when the first fringe node S3 finds the direct connected link fault of its subring, can not take any operation.
Second kind, report link failure to the first fringe node S3 or the second fringe node S5 of the appearance of subring R2 by other nodes of subring R2.The transmission node of subring R2 directly detects oneself, and any one belongs to the direct connected link fault of the port of RRPP domain, reports then.If report to the second fringe node S5 earlier, then the second fringe node S5 sends a notification message to the first fringe node S3.Certainly, also can not adopt the mode of second fringe node S5 notice, directly report to the first fringe node S3, for example, directly report the first fringe node S3 by various paths; Perhaps report to the second fringe node S5 earlier, pass S5 then and arrive the first fringe node S3 along main ring path; Perhaps pass the second fringe node S5 and report to another node of main ring, send a notification message to the first fringe node S3 by this node.For example, the second fringe node S5 sends a notification message to the first fringe node S3 by main ring path; Certainly, the second fringe node S5 also can send a notification message to the first fringe node S3 by the path of other subrings.Preferably, directly report the first fringe node S3.
The third periodically sends probe messages along subring to the first fringe node S3 from the second port P2 of virtual host node by the second fringe node S5 and detects subring R2 link failure.When in the given time, the first port P1 of the virtual host node of auxilliary fringe node S3 does not receive the probe messages that fringe node S5 sends, and thinks that then main ring breaks down.The method of above-mentioned transmission probe messages not only is used to detect link failure, also can be used to detect link-recovery, so no matter whether the second fringe node S5 can exist link failure all ceaselessly periodically to send probe messages.
Preferably, more than three kinds of fault detect mode combined runnings because backup, additional relation are all arranged mutually, so can the best, the fastest existence that detects subring R2 fault.
Handling process when below the subring R2 of this intersecting ring network being broken down describes, and how the present invention realizes fast automatic protection with the expectation explanation.
Because in looped network of the present invention is provided with, main ring R1 is virtual to be the host node of subring R2, so one or more than one fault in the main ring link, occur, for subring R2, all be that fault has appearred in host node inside, subring R2 does not need to handle to get final product, and does not influence each internodal transfer of data of subring; One or more fault occurs if work as subring R2 link, then the first port P1 relieving with virtual host node can realize automatic protection, and processing procedure is simply rapid.
When the interworking Ethernet ring network operate as normal, the first port P1 of virtual host node is that blocked state (allows this fringe node equipment to receive protocol massages, but the blocking data message passes through), second fringe node S5 meeting timed sending probe messages, the transmission path of this probe messages is for arriving the first port P1 of the virtual host node of the first fringe node S3 by transmission node S7, S8 and S9.
When learning that by aforesaid fault detect mode subring R2 breaks down, then the first port P1 with virtual host node decontrols, and becomes forward mode, and refreshes each node and transmit.
When link failure occurring among the main ring R1; fault has appearred in the host node that means subring R2; this moment, this subring looped network entered malfunction; but only need main ring R1 to recover to get final product according to the guard method of monocycle voluntarily; promptly decontrol the secondary port of main ring host node, and subring R2 need not to carry out extra protection step.
Below fault recovery is described:
The second fringe node S5 can detect the fault recovery situation of subring R2 by active poll looped network state: the second fringe node S5 periodically sends probe messages by subring to the first fringe node S3 from the second port P2 of virtual host node; If the first fringe node S3 receives described probe messages, then the first port P1 with virtual host node is made as blocking model, and refreshes and transmit.
Certainly, the detection of described fault recovery can also comprise that each node detection reports the mode of the second fringe node S5 or the first fringe node S3 after its direct connected link fault recovery.Receive the message of looped network recovery as the first fringe node S3 after, refresh and transmit, the first port P1 with virtual host node after receiving probe messages is made as blocking model.
In above-mentioned troubleshooting and fault recovery flow process, first fringe node and second fringe node can initiate to refresh the notice of transmitting, and the notice fault recovery; In addition, notified by a fringe node, perhaps two fringe nodes are notified, and all are acceptable in the present invention.
The time point that recovers from the port of node generation link failure is to finding the time point that loop network link regains one's integrity, because generally can there be certain time interval in the forwarding of probe messages.Might form a temporary loop in during this period of time, so the present invention is preferred, when subring R2 link failure, just the port with the both link ends of disconnection blocks temporarily; Perhaps in node detection during, the port of the both link ends that disconnects is blocked temporarily to himself link failure recovery.
For example, the information when node detection is recovered to the faulty link between itself and the adjacent node then keeps blocking the port that this faulty link recovers; And start a forward delay timer; Receive the notification message that looped network recovers when described forward delay timer expiry or this node, then the port of described obstruction is moved to forwarding state.Described node can be each transmission node, also can be described fringe node.
Above-mentioned handling process is similar to the handling process of the fast automatic protection of single looped network, is equivalent to the combination of two single network automatic protection processes; During with the virtual host node for subring R2 of main ring R1, data can be transmitted in host node inside, but still only there are two ports in it for subring R2: the second port P2 and the first port P1.In the top description, the not detailed part of fault detect and failback can be referring to the description of Fig. 1 relevant portion.
Need to prove, with reference to Fig. 2, for main ring R1 and subring R2, in this intersecting ring network, under the situation about all breaking down when the path of two main rings between fringe node, because the first port P1 of virtual host node is a blocked state still, so cause the data message of subring can't be passed to some node of main ring.
At this moment, scheme one: the edge port recovery forwarding state that can select to connect a subring realizes that the data message of subring can be passed to some node of main ring.
Scheme two: keep the first port P1 of virtual host node still to be blocked state.Because main ring generally all belongs to convergence-level, and subring generally all belongs to Access Layer, because the VLAN of convergence-level and Access Layer setting generally has nothing in common with each other, so even the transfer of data between the two guarantee in subring under the situation of topological all-pass, also may be invalid.So scheme two can not go to pursue under the situation of multilink fault, all nodes remain all-pass on the main ring, but the all-pass when preferably adopting simple process flow to guarantee Single Point of Faliure in the entire domain and the fast quick-recovery of flow; Satisfy on the basis of practical application guaranteeing, reach the fastest best automatic protection speed.
The automatic protecting method of ether intersecting ring network of the present invention can guarantee the needs of subring transfer of data in actual applications, and can not influence the transfer of data of main ring, has reached the balance an of the best between protection cost, protection effect, protection speed.In a word, can think that the present invention is a scheme of simplifying the assurance practicality that realizes.
With reference to Fig. 3, be the schematic diagram that intersecting ring network shown in Figure 2 is carried out the specific embodiment of fast automatic protection.
In intersecting ring network shown in Figure 3, fault has taken place in link L2, and described L2 is the link between this intersecting ring network node S3 and the node S4.Because the fault of L2 occurs on the main ring R1, can think that internal fault has taken place the virtual host node of subring R2, then subring R2 does not handle the fault of L2.At this moment, main ring R1 carries out the fast automatic protection of monocycle, after the host node S4 of main ring R1 learns the link failure of L2, its secondary port p12 is transformed to forward mode gets final product.
With reference to Fig. 4, be the schematic diagram that intersecting ring network shown in Figure 2 is carried out another embodiment of fast automatic protection.
In intersecting ring network shown in Figure 4, link failure has appearred in the link L1 among the subring R2 between node device S10 and the S11.The first fringe node S3 learns this link failure, and then the first port P1 with virtual host node is transformed to forwarding state.Disposition when more than a link failure occurring for the subring of this intersecting ring network.
When if L1 breaks down, fault has also taken place in the L2 shown in Fig. 4, and described L2 is the link between this intersecting ring network node S3 and the node S4.Because the fault of L2 occurs on the main ring R1, can think that internal fault has taken place the virtual host node of subring R2, then subring R2 does not handle the fault of L2.At this moment, main ring R1 carries out the fast automatic protection of monocycle, after the host node S4 of main ring R1 learns the link failure of L2, its secondary port p12 is transformed to forward mode.Be that main ring and subring are protected automatically to the interior link failure that occurs of oneself ring respectively, be independent of each other between the two, can realize protection very simply, fast this intersecting ring network.
With reference to Fig. 5, be the schematic diagram that three looped networks are formed intersecting ring network.
Main ring R1 and subring R2, subring R3 form an intersecting ring network by fringe node S3, S5, in this intersecting ring network, main ring R1 and subring R2 intersect by two sections common link between S3 and the S5, main ring R1 and subring R3 also intersect by two sections common link between S3 and the S5, subring R2 comprises transmission node S7, S8, S9, and subring R3 comprises defeated node S10, S11, S12.In this intersecting ring network, main ring R1 is as the virtual host node of subring R2, subring R3.The port that main ring R1 is connected with subring R2 is the first port p33 of the second port p53 of virtual host node, virtual host node; The port that main ring R1 is connected with subring R3 is the first port p34 of the second port p54 of virtual host node, virtual host node.
Method of the present invention is applied to the fast automatic protection to this intersecting ring network too.Because when in fact carrying out fast automatic protection, consider separately that still main ring R1 and arbitrary subring carry out aforesaid handling process and get final product.At this, the present invention no longer has been described in detail the concrete fast automatic protection flow process of looped network shown in Figure 5.
Each subring is identical with two crossed nodes of main ring in the intersecting ring network shown in Figure 5, and certainly, the present invention can support that also each subring is different situations (with reference to Fig. 6) with two crossed nodes of main ring, because situation is similar, is not described in detail in this.
Need to prove,, the situation of two link failures occurs for intersecting ring network main ring shown in Figure 5 with reference to Fig. 7.In the intersecting ring network shown in Figure 7, fault has taken place in the link L3 that node S2-S1 forms among the main ring R1, and fault has also taken place in the link L2 between the node S3-S4, but for subring R2 and R3, these faults all are the faults that is positioned at its virtual host node inside, need not subring and operate accordingly, the port of the obstruction of each subring correspondence still maintains the original state and gets final product.For main ring R1, a fault occurring is the same with the disposition that two faults occur, only the secondary port of main ring host node need be opened to get final product.Certainly further, when two or more common link of main ring breaks down, can select the secondary port of a virtual host node to decontrol.
In actual applications, a main ring may connect more subring, form very complicated intersecting ring network, but when breaking down, still consider separately that main ring R1 and arbitrary subring carry out aforesaid handling process and get final product, because fringe node difference that each subring is intersected with main ring or identical fringe node, but connectivity port difference.
In actual applications, also more complicated networking structure can occur, for example, can comprise a plurality of main rings and a plurality of subring in the described networking, but all be that main ring passes through different fringe nodes or different continuous compositions of port with subring.When main ring relatively and during subring generation link failure, consider separately that still main ring and arbitrary subring carry out aforesaid handling process and get final product.
Preferably, the present invention can be provided with a plurality of virtual LAN VLAN on single looped network, and described fast automatic guard method can be supported a VLAN or a plurality of VLAN (example).Generally speaking, the port of same both link ends can comprise a plurality of examples, and an example can comprise a plurality of VLAN again, and data finally are to transmit in a VLAN.802.1Q the Ethernet specified data belong to some VLAN, example is the gathering of a plurality of VLAN, port is again the gathering of a plurality of examples.Be that fast automatic guard method of the present invention can be controlled first port of virtual host node in a VLAN internal congestion or forwarding; first port that also can control virtual host node is in an example internal congestion or forwarding, and first port that also can control virtual host node blocks on a port or transmits.
The present invention also provides a kind of interworking Ethernet ring network, in described interworking Ethernet ring network, be provided with the fast looped network protected field, described fast looped network protected field comprises a main ring and a subring, wherein main ring is as the virtual host node of subring, main ring passes through first fringe node and second fringe node and subring and intersects, the port that first fringe node links to each other with subring is first port of virtual host node, and the port that second fringe node links to each other with subring is second port of virtual host node; When group loop chain road was normally moved, second port of virtual host node was a forward mode, and first port of virtual host node is a blocking model; When link failure was given birth in the group environment-development, first port of virtual host node was transformed to forward mode, and refreshes transmitting of main ring and each node of subring.
Wherein, all can also include other nodes in two paths of two fringe nodes of connection on the described main ring.Be the present invention to whether comprising in two paths that connect two fringe nodes that other nodes are not limited, those skilled in the art are provided with as required and get final product.
Wherein, described main ring can comprise a host node, and during the main ring operate as normal, the master port of main ring host node is a forward mode, and secondary port is a blocking model; When main ring generation link failure, the secondary port of main ring host node becomes forward mode by blocking model, and refreshes and transmit.
Wherein, during link failure appearred in subring, second fringe node periodically sent probe messages by subring to first fringe node from second port of virtual host node; If first fringe node is received described probe messages, then first port of virtual host node becomes blocking model by forward mode, and refreshes and transmit.
Described interworking Ethernet ring network can also comprise a forward delay timer, is used for: when node detection to the information that the faulty link between itself and the adjacent node recovers, then block the port that this faulty link recovers; And start described forward delay timer; Receive the notification message that looped network recovers when described forward delay timer expiry or this node, then the port of described obstruction is moved to forwarding state.
The present invention also provides a kind of node device of interworking Ethernet ring network, and described node device connects at least one main ring and at least one subring, and described main ring and subring are intersected by two nodes, and described main ring is as the virtual host node of subring; When normal operation, the port that described node device links to each other with subring is a blocking model; When this subring link occurs fault, described node device will be transformed to forward mode by blocking model with described port, and refresh and transmit.Described node device also is used to detect the fault of its direct connected link, and receives the signalling trouble message that other nodes of subring send.
Described node device can also comprise a delay timer, if in preset time, does not receive the probe messages of another crossing node of described main ring and subring along the path transmission of described subring, then thinks to detect this subring link occurs fault.
Preferably, during link failure appears in subring,, then first port is become blocking model by forward mode, and refresh and transmit if described node device is received the probe messages that another node that described main ring and subring intersect sends along the path of described subring.
Described node device can be referring to the associated description of front, for example, and the fringe node S3 of looped network shown in Figure 2.Node S3 connects main ring R1 and subring R2, and main ring R1 and subring R2 intersect by the common link that is made of node S3-S5; When normal operation, the port P1 that described node S3 links to each other with subring R2 is a blocking model, promptly can transmit the protocol massages of subring, but blocks the data message of subring; When this subring link occurs fault, then described node S3 and described port P1 are transformed to forward mode by blocking model, and refresh and transmit.
The present invention also provides the node device of another kind of interworking Ethernet ring network, and described node device connects at least one main ring and at least one subring, and described main ring and subring are intersected by two nodes, and described main ring is as the virtual host node of subring; Described node device periodically sends probe messages by the path of wherein subring.
Preferably, when it learned this subring link occurs fault, then described node device notified another node device that described main ring and subring are intersected to open the port that links to each other with this subring.Described node device can also comprise the forward delay timer, is used for: when this node device detects the information that the faulty link between itself and the adjacent node equipment recovers, then block the port that this faulty link recovers, and start described forward delay timer; Receive the notification message that looped network recovers when described forward delay timer expiry or this node device, then the port of described obstruction is moved to forwarding state.
Described node device can be referring to the associated description of front, fringe node S5.Node S5 connects main ring R1 and subring R2, and main ring R1 and subring R2 intersect by the common link that is made of node S3-S5; When normal operation, the port P2 that described node S5 links to each other with subring R2 is a forward mode, promptly can transmit the protocol massages and the data message of subring; Described node device S5 periodically sends probe messages by the path of wherein subring, and being used for initiatively, whether poll detection subring fault has taken place.
The present invention also provides the node device of another kind of interworking Ethernet ring network, and this node device is positioned on the main ring, and described main ring and subring are intersected by two nodes, and described main ring is as the virtual host node of subring; Described node device is used for the protocol massages of transparent transmission subring, and handles refreshing of subring and transmit message.For example, the S2 of looped network shown in Figure 2, S6.
More than to the automatic protecting method of a kind of interworking Ethernet ring network provided by the present invention and interworking Ethernet ring network, the node device of interworking Ethernet ring network, be described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (13)
1, a kind of guard method of interworking Ethernet ring network; it is characterized in that; in described interworking Ethernet ring network, be provided with the fast looped network protected field; described fast looped network protected field comprises main ring and subring; wherein main ring is as the virtual host node of subring; main ring passes through first fringe node and second fringe node and subring and intersects; the port that first fringe node links to each other with subring is first port of virtual host node; the port that second fringe node links to each other with subring is second port of virtual host node, said method comprising the steps of:
Second port that virtual host node is set is a forward mode, and first port of virtual host node is a blocking model;
Detect described subring whether link failure takes place, if, then;
First port of virtual host node is made as forward mode, and initiates to refresh to transmit notice.
2, the guard method of interworking Ethernet ring network as claimed in claim 1 is characterized in that, also comprises:
Recover when described subring ring network fault, then first port with virtual host node is made as blocking model, and initiates to refresh to transmit notice.
3, the guard method of interworking Ethernet ring network as claimed in claim 1 is characterized in that, also comprises:
Described main ring comprises a host node, and during the main ring operate as normal, the master port of main ring host node is set to forward mode, and secondary port is set to blocking model;
If detect described main ring generation link failure, then the secondary port with the main ring host node is made as forward mode, and initiates to refresh to transmit notice.
4, the guard method of interworking Ethernet ring network as claimed in claim 1 is characterized in that, the step whether described detection subring link failure takes place comprises:
Second fringe node periodically sends probe messages by subring to first fringe node from second port, and in the given time, first port of virtual host node is not received probe messages, then thinks to detect the subring link failure;
Perhaps, second fringe node detects its subring direct connected link and breaks down, and notifies first fringe node;
Perhaps, the transmission node of subring detects the fault of its direct connected link, directly reports first fringe node;
Perhaps, the transmission node of subring detects the fault of its direct connected link, reports second fringe node, notifies first fringe node by second fringe node.
5, a kind of interworking Ethernet ring network is characterized in that,
In described interworking Ethernet ring network, be provided with the fast looped network protected field, described fast looped network protected field comprises main ring and subring, wherein main ring is as the virtual host node of subring, main ring passes through first fringe node and second fringe node and subring and intersects, the port that first fringe node links to each other with subring is first port of virtual host node, and the port that second fringe node links to each other with subring is second port of virtual host node;
When group loop chain road was normally moved, second port of virtual host node was a forward mode, and first port of virtual host node is a blocking model;
When link failure was given birth in the group environment-development, first port of virtual host node was transformed to forward mode, and refreshes transmitting of main ring and each node of subring.
6, interworking Ethernet ring network as claimed in claim 5 is characterized in that, also comprises:
When the subring ring network fault was recovered, first port of virtual host node was transformed to blocking model, and refreshed transmitting of main ring and each node of subring.
7, interworking Ethernet ring network as claimed in claim 5 is characterized in that, also comprises other nodes on the main ring of two fringe nodes of connection and the arbitrary paths in the subring.
8, interworking Ethernet ring network as claimed in claim 6 is characterized in that:
Described main ring comprises a host node, and during the main ring operate as normal, the master port of main ring host node is a forward mode, and secondary port is a blocking model;
When main ring generation link failure, the secondary port of main ring host node becomes forward mode by blocking model, and initiates to refresh to transmit notice.
9, interworking Ethernet ring network as claimed in claim 6 is characterized in that, also comprises at least one node device, and this node device is positioned on the main ring, and described main ring and subring are intersected by two fringe nodes, and described main ring is as the virtual host node of subring; Described node device is used for the protocol massages of transparent transmission subring, and handles refreshing of subring and transmit message.
10, a kind of node device of interworking Ethernet ring network is characterized in that:
Described node device connects at least one main ring and at least one subring, and described main ring and subring are intersected by two fringe nodes, and described main ring is as the virtual host node of subring, and this virtual host node is protected automatically to this interworking Ethernet ring network;
When subring normally moved, the port that described node device links to each other with subring was a blocking model;
When this subring link occurs fault, described node device is transformed to forward mode with described port by blocking model, and initiates to refresh to transmit notice.
11, the node device of interworking Ethernet ring network as claimed in claim 10 is characterized in that:
Described node device also comprises a delay timer, if in preset time, does not receive the probe messages of another crossing node of described main ring and subring along the path transmission of described subring, then thinks to detect this subring link occurs fault.
12, as the node device of claim 10 or 11 described interworking Ethernet ring network, it is characterized in that:
Described node device periodically sends probe messages along the path of described subring to another node device that described main ring and subring are intersected.
13, as the node device of claim 10 or 11 described interworking Ethernet ring network, it is characterized in that:
This node device is positioned on the main ring, and described main ring and subring are intersected by two nodes, and described main ring is as the virtual host node of subring;
Described node device is used for the protocol massages of transparent transmission subring, and handles refreshing of subring and transmit message.
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