CN104683207A - Method and device for nodes of MPLS-TP (multi-protocol label switching-transport profile) ring topology - Google Patents
Method and device for nodes of MPLS-TP (multi-protocol label switching-transport profile) ring topology Download PDFInfo
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Abstract
The invention discloses a method and a device for nodes of MPLS-TP (multi-protocol label switching-transport profile) ring topology. Nodes receive an automatic protection switching protocol data unit containing a route indicator from adjacent nodes; the ring topology structure is determined according to an east adjacent node identifier and a west adjacent node identifier; the switching operation is determined according to the route indicator and a source node identifier in the automatic protection switching protocol data unit in the ring topology structure of two nodes; further, the ring topology receives the automatic protection switching protocol data unit containing a ring identifier; the section layer sharing is determined according to the ring identifier in the automatic protection switching protocol data unit; the automatic protection switching protocol data unit containing the ring identifier is sent to the adjacent node of the node in the same section layer except when any one in the ring identifier is zero. A route indicator and the ring identifier are added into the automatic protection switching protocol data unit, so that the flexible and compatible ring topology structure with reduced port limitation is realized.
Description
Technical field
The present invention generally relates to MPLS-TP ring topological structure, more specifically, relates to the method and apparatus for the node in MPLS-TP ring topological structure.
Background technology
MPLS-TP ring protection turning protocol is the benchmark of ring protection mechanism.MPLS-TP ring protection turning protocol comprises the resist technology of two types: switch (wrapping) and turn in (steering) the present invention and only consider handoff technique.The topology of a ring comprises multiple node, and each node has both sides: east side and west side.Every side corresponds to a port.Two-way approach is transmitted as between two nodes.Handoff technique means when nodal test will send APS agreement (APS) request to the adjacent node with the same span of Signal Fail to such as Signal Fail (SF) in APS protocol Data Unit (APS PDU).When nodal test is to SF or APS request in receiving to this node APS PDU; the data sent towards the span of Signal Fail in work tap switching path (LSP) are switched on the protection LSP in contrary direction, are switched to again in working LSP after along ring to another one node.
According to MPLS-TP ring protection turning protocol, in ring topological structure, some are had to limit:
1) each ring comprises minimum three nodes.Ring (RWTN) topology of two nodes cannot be supported; And
2) in ring, each node has east side and west side, the corresponding port in every side.If a node needs to support N number of ring topology, then this node needs 2N port.When the value of N is very large time, the quantity of the port of a node is sizable, and this can cause port to limit.
Owing to the problems referred to above, setting up a topology of the ring based on existing MPLS-TP is underaction.Therefore, be necessary exploitation one flexibly, the ring topology of the MPLS-TP that compatible and port restriction reduces.
Summary of the invention
In order to overcome the problems referred to above, the invention discloses one flexibly, the ring topology of the MPLS-TP that compatible and port restriction reduces.
According to a first aspect of the invention, provide a kind of method for the node in MPLS-TP ring topology, comprise: the first APS protocol Data Unit containing route indicator from eastern neighbors receiving package, the described route indicator in described first APS protocol Data Unit indicates the east side RX path state of described node; Contain the second APS protocol Data Unit of route indicator from western neighbors receiving package, the described route indicator in described second APS protocol Data Unit indicates the west side RX path state of described node; Described ring topological structure is judged with the mark of described western neighbors according to described eastern neighbors; If it is determined that and be the ring topology of two nodes, judge handover operation according to the described route indicator in described first and second APS protocol Data Units and source node identification.
According to one embodiment of present invention, described two the internodal paths of route indicator instruction in the ring topological structure of described two nodes initiate request path or non-initiation request path; Described initiation request path represents APS request locking protection/force handoff/Signal Fail/manual switchover/Wait-to-Restore/practise initiating in described path; Described non-initiation request path represents the described path of the side away from described initiation request path.
According to one embodiment of present invention, the described route indicator in described first the APS protocol Data Unit in the ring topology of described two nodes and the described route indicator in described second protocol Data Unit arrange based on a local APS request.
According to one embodiment of present invention, method for the node in MPLS-TP ring topology also comprises: send to described eastern neighbors the 3rd APS protocol Data Unit comprising route indicator, and the described route indicator in described 3rd APS protocol Data Unit indicates east side transmit path state and arranges described route indicator according to described first APS protocol Data Unit; And sending to described western neighbors the 4th APS protocol Data Unit comprising route indicator, the described route indicator in described 4th APS protocol Data Unit indicates west side transmit path state and arranges described route indicator according to described second APS protocol Data Unit.
According to one embodiment of present invention, the step of described judgement handover operation comprises: if the described source node identification in described first APS protocol Data Unit equals described western neighbors mark and described route indicator in described first APS protocol Data Unit is described non-initiation request path, perform the operation being switched to east side; If or the described source node identification in described second APS protocol Data Unit equals described eastern neighbors mark and described route indicator in the second APS protocol Data Unit is described non-initiation request path, perform the operation being switched to west side.
According to one embodiment of present invention, each described route indicator takies 1 bit in corresponding APS protocol Data Unit.
According to one embodiment of present invention, equal described western neighbors mark just judge the ring topological structure of described ring topological structure as described two nodes if the step of described judgement described ring topological structure comprises described eastern neighbors mark.
According to a second aspect of the invention, provide a kind of node in the ring topology of MPLS-TP, comprise: receiver, it is configured to the first APS protocol Data Unit containing route indicator from eastern neighbors receiving package, and the described route indicator in described first APS protocol Data Unit indicates the east side RX path state of described node; Contain the second APS protocol Data Unit of route indicator from western neighbors receiving package, the described route indicator in described second APS protocol Data Unit indicates the west side RX path state of described node; First identifying unit, it is configured to judge described ring topological structure according to described eastern neighbors with the mark of described western neighbors; And second identifying unit, if it is determined that it is configured to be the ring topology of two nodes, judge handover operation according to the described route indicator in described first and second APS protocol Data Units and source node identification.
According to one embodiment of present invention, a kind of node in the ring topology of MPLS-TP also comprises: transmitter, it is configured to send to described eastern neighbors the 3rd APS protocol Data Unit comprising route indicator, and the described route indicator in described 3rd APS protocol Data Unit indicates east side transmit path state and arranges described route indicator according to described first APS protocol Data Unit; And sending to described western neighbors the 4th APS protocol Data Unit comprising route indicator, the described route indicator in described 4th APS protocol Data Unit indicates west side transmit path state and arranges described route indicator according to described second APS protocol Data Unit.
According to one embodiment of present invention, equal described western neighbors mark just judge the ring topological structure of described ring topological structure as described two nodes if described first identifying unit is configured to described eastern neighbors mark.
According to one embodiment of present invention, if the described second identifying unit described source node identification be configured in described first APS protocol Data Unit equals described western neighbors mark and described route indicator in described first APS protocol Data Unit is described non-initiation request path, perform the operation being switched to east side; If or the described source node identification in described second APS protocol Data Unit equals described eastern neighbors mark and described route indicator in the second APS protocol Data Unit is described non-initiation request path, perform the operation being switched to west side.
According to a third aspect of the present invention, provide a kind of method for the node in MPLS-TP ring topology, comprise from first ring receive the first APS protocol Data Unit and from second articulating receive the 3rd APS protocol Data Unit, described first APS protocol Data Unit comprises the first ring mark representing described first ring, and the ring mark of the described 3rd dynamic pretection switch protocol Data Unit comprises the second ring mark representing described second ring; Described first ring identified embedding second APS protocol Data Unit and state in the second ring mark embedding the 4th APS protocol Data Unit by described; Judge that section layer is shared according to the described first ring mark in described second APS protocol Data Unit and the described second ring mark in described 4th APS protocol Data Unit; Unless and described ring mark in one be zero, in neighbors from same section of layer to described node send comprise first ring mark described second APS protocol Data Unit and comprise second ring mark described 4th APS protocol Data Unit.
According to one embodiment of present invention, the step that described judgement described section of layer is shared comprises: if the value of described first ring mark and described second ring mark is respectively an integer value in 1 to 127, described section of layer between described node and described neighbors can be shared by described first ring and described second ring.
According to a fourth aspect of the present invention, provide a kind of node in the ring topology of MPLS-TP, comprise: receiver, it is configured to receive the first APS protocol Data Unit from first ring and receive the 3rd APS protocol Data Unit from the second articulating, described first APS protocol Data Unit comprises the first ring mark representing described first ring, and the ring mark of described 3rd APS protocol Data Unit comprises the second ring mark representing described second ring; Plug-in unit, it is configured to described first ring mark embedding second APS protocol Data Unit and states in the second ring mark embedding the 4th APS protocol Data Unit by described; Identifying unit, it is configured to judge that section layer is shared according to the described first ring mark in described second APS protocol Data Unit and the described second ring mark in described 4th APS protocol Data Unit; And transmitter; unless its of being configured in described ring mark is zero, in same section of layer, send the described second APS protocol Data Unit comprising first ring mark and the described 4th APS protocol Data Unit comprising the second ring mark to the neighbors of described node.
According to one embodiment of present invention, if it is respectively an integer value in 1 to 127 that described identifying unit is configured to the value that described first ring mark and described second ring identify, judge that described section of layer between described node and described neighbors can be shared by described first ring and described second ring.
By adding route indicator (PI) and ring mark in APS PDU, the methods and apparatus disclosed in the present invention:
1) problem based on the faulty operation caused by the handover operation of the standard of the APS PDU received in the ring topology of two nodes is mainly solved, ensure that compatibility between RWTN and non-RWTN topology by adding PI in APS PDU simultaneously, namely method disclosed by the invention can support RWTN and non-RWTN topology simultaneously, does not also need extra configuration;
2) decrease port restriction by adding ring mark in APS PDU, such node needs relatively less port just can support multiple ring topology; And
3) by the default value of setting ring mark, solve in legacy system and do not have ring to identify the compatibility issue caused.
Accompanying drawing explanation
The present invention also illustrate in greater detail the present invention with reference to accompanying drawing by way of example, wherein:
Fig. 1 shows APS request coding;
Fig. 2 shows the node state change schematic diagram that one way signal lost efficacy;
Fig. 3 shows the flow chart of the handover operation of the standard based on the APS received;
Fig. 4 shows the ring topological structure of two nodes;
Fig. 5 shows the content of MPLS-TP APS protocol Data Unit;
Fig. 6 shows the flow chart of the handover operation based on the APS received of the ring topological structure for two nodes;
The node state change schematic diagram that the one way signal that Fig. 7 shows the ring topological structure of two nodes lost efficacy;
Fig. 8 shows the mechanism of the ring topological structure of judgement two nodes;
The embodiment (maximum support 127 ring topologys) that the section layer that Fig. 9 shows multiple ring topology is shared; And
Figure 10 shows another embodiment that multiple ring topology shares stratum.
Through in accompanying drawing above, identical Reference numeral will be understood to identical, similar or corresponding feature or function.
Embodiment
In the specific descriptions of following preferred embodiment, with reference to the accompanying drawing formed appended by a part of the present invention.Appended accompanying drawing shows by way of example and can realize specific embodiment of the present invention.The embodiment of example is not intended to limit according to all embodiments of the present invention.It should be noted that, although describe the step of method in the present invention in accompanying drawing with particular order, but this not requires or hint must perform these operations according to this particular order, or the operation shown in must performing all could realize the result of expectation, on the contrary, step described herein can change execution sequence.Additionally or alternatively, some step can be omitted, multiple step be merged into a step and perform, and/or a step be decomposed the multiple step of dimension and perform.
MPLS-TP ring protection turning protocol defines the form of APS PDU, and APS PDU comprises three parts: destination node marking (ID), source node identification and APS request coding.As shown in Figure 1, eight different APS request codings are always had.Although in an embodiment of the present invention; only describe the situation of Signal Fail (SF) as APS request coding, but method proposed by the invention other the APS also gone in two-way approach asks coding such as to lock protection/force handoff/Signal Fail/manual switchover/Wait-to-Restore/exercise.Destination node marking always must be set to the value of the node identification of adjacent node.The value of effective destination node marking is 1-127.Source node identification must be set to the node identification generating APS request.APS request comprises local APS request and far-end APS asks.Effective source node identification value is 1-127.The node location of ring topological structure is configured by network management, and each node knows its adjacent node identification.
MPLS-TP ring protection turning protocol also defines three node states: idle (IDL) state, straight-through (PT) state and switching (SW) state.
Idle condition: when a node is in idle condition, its APS request is encoded to two-way nothing request.
Switching state: be not or not at switching state at the node of idle condition or pass-through state.
Pass-through state: when node is in pass-through state, its priority the highest APS request be can not by its produce or can not with it for destination node.Pass-through state is two-way.
Fig. 2 shows the state variation of the node in unidirectional SF situation.As shown in Fig. 2 (a), each node is in idle condition, in this ring topology, do not have Signal Fail, and therefore APS request is encoded to without request.As shown in Fig. 2 (b), node C (203) detects SF in west side and send SF to joint B (202) from the APS PDU of both sides and asks SF (C->B).Because this APS asks to be produced by node C (203) oneself, so this is a local APS request coming from node C (203).Meanwhile, node C (203) enters switching state and performs the operation being switched to east side.APS request in every other path in ring is all without request.In Fig. 2 (c), node D (204) and node A (201) receives SF (C->B), and find that source node identification in APS PDU and target identification are not oneself marks, node D (204) enters PT state. node A (201) (or node D (204)) sends the APS received from another example of node A (201) (or node D (204)) and asks its neighbors from side.Finally, Node B (202) receives SF (C->B) and finds that destination node marking in SF (C->B) is the mark of Node B (202), and the source node identification in SF (C->B) is the mark of its eastern neighbors C (203), Node B (202) enters switching state and performs the operation being switched to west side.
Fig. 3 shows the flow chart of the handover operation of the standard based on the APS PDU received.
In step S300, all nodes are all in idle condition.
In step S301, node receives APS request and APS request coding is not without request.
In step s 302, node checks that whether destination node marking is identical with node identification.If destination node marking and node identification are different, node enters pass-through state (ring that pass-through state is only applicable to be no less than three nodes is opened up); If destination node marking and node identification are identical, node enters switching state.
In step S303, after node enters switching state, the source node identification of node inspection in the APS PDU received.If source node identification=western neighbors mark in the APS PDU received, node performs and is switched to east side operation; If source node identification is identical with eastern neighbors mark in the APS PDU received, node performs and is switched to west side operation; If do not meet above-mentioned condition, node does not perform handover operation.
According to ring topological structure, if RWT N as shown in Figure 4, its eastern neighbors mark is identical with the mark of western neighbors.When SF produces between the east side (421) and the west side (412) of node A (410) of Node B (420), Node B (420) receives SF (A->B) from east side (421) and west side (422).Because the neighbors mark of Node B (420) both sides is identical, namely node A (410) mark, according to the flow chart of the handover operation of the standard based on the APS PDU received as shown in Figure 3, Node B (420) performs and is switched to the operation in east side and is switched to the operation in west side.But this is a wrong operation.According to expection, Node B (420) only performs the operation being switched to west side.When node A (410) receives SF (B->A) from east side (411), node A (410) also performs the operation being switched to east side and being switched to west side simultaneously, this operation that neither expect.According to expection, node A (410) should only perform the operation being switched to east side.
In order to solve when producing SF in ring topology, the collision problem of the handover operation in RWTN, as shown in Figure 5, adds extra byte in APS PDU.As an example, extra byte also can the reserved byte of APS PDU.Like this, extra byte does not just need to spend extra bandwidth.Extra byte comprises two parts: designator (PI) and two the internodal path statuss of ring mark .PI instruction in RWTN initiate request path (IRP) or non-initiation request path (NIRP).IRP represents APS request locking protection/force handoff/Signal Fail/manual switchover/Wait-to-Restore/practise initiating in described path; NIRP represents the path of the side away from described initiation request path.As an example, PI can be 1 bit, and ring mark can be 7 bits.PI and ring mark also can represent by other any suitable number of bits.
Fig. 6 shows the flow chart of the handover operation for RWTN based on the APS PDU received.Wherein step S600 is identical with step S301 with the step S300 described in figure 3 with step S601.In step S602, RWTN does not have as pass-through state (pass-through state in Fig. 6 is dotted line frame) in step s 302.
In step S603, node judges when whether the source node identification received is identical with western neighbors mark.If identical, node judges whether the PI received from east side is NIRP further in step s 604.If the PI received from east side is NIRP, the node in RWTN performs the operation being switched to east side.In step S603, node also judges whether the source node identification received is identical with eastern neighbors mark.If identical, node judges whether the PI received from west side is NIRP further in step s 605.If the PI received from west side is NIRP, the node in RWTN performs and is switched to west side operation.Otherwise node does not perform handover operation.Because concerning RWTN, eastern neighbors mark always equals western neighbors mark, and like this when the source node identification received and eastern neighbors identify identical time, it is in fact also simultaneously identical with western neighbors mark.Like this, based on the source node identification of the PI in APS PDU and reception, node just avoids faulty operation, and also, although identical with western neighbors mark in RWTN Middle East neighbors mark, node also can not be switched to east side simultaneously and be switched to west side.
Fig. 7 shows the unidirectional node state change schematic diagram caused in RWTN.In Fig. 7 (a), node A (710) and Node B (720) are all in idle condition.In Fig. 7 (b), node A (710) detects unidirectional SF, and node A learns that the path between Node B (720) east side (721) and node A (710) west side (712) is IRP and path between the east side (711) of the west side (722) of Node B (720) and node A (710) is NIRP.Node A (710) sends SF (A->B) and PI=IRP from west side (712) and sends SF (A->B) and PI=NIRP from east side (711).Meanwhile, node A (710) enters switching state and performs and is switched to east side operation.In Fig. 7 (c), Node B (720) receives SF (A->B) and PI=IRP from east side (722), and according to Fig. 6, Node B (720) does not perform and is switched to east side operation.When Node B (720) receives SF (A->B) and PI=NIRP from west side (722), because the source node identification received and eastern neighbors identify PI=NIRP that is identical and that receive from west side, Node B (720) enters switching state and performs the operation being switched to west side.
According to the PI in the APS PDU received from both sides, Node B (720) is learned and is IRP and PI is the such Node B of NIRP. (320) in Node B west side (722) and node A (710) east side (712) sends RR (B->A) and PI=IRP and from west side (722) transmission SF (B->A) and PI=NIRP from east side (721) at the PI between Node B (720) east side (721) and node A (710) west side (712).Node A (710) meets SF (B->A) and PI=NIRP from east side (711) and receives RR (A->B) and PI=IRP from west side (712), is switched to the operation in east side so node A (710) only performs instead of is switched to the operation in west side.
In order to the handover operation flow chart completely with as shown in Figure 3 based on the standard of the APS request received is compatible, judge that the feature that handover operation is only applicable to RWTN is that eastern neighbors mark and western neighbors identify identical according to PI and the source node identification of reception.According to this feature, as shown in Figure 8, node oneself can judge ring topological structure whether as RWTN.If RWTN, be applicable to flow chart as shown in Figure 6; If not RWTN, be applicable to flow chart as shown in Figure 3. owing to judging that RWTN is without any need for extra configuration, so mutually compatible with the normal process shown in Fig. 3.
As shown in Figure 9, ring mark is used to the ring mark of the APS PDU indicated in all sections of layers in same ring.Such as, section layer between the two nodes can be shared by 127 rings at most.Ring mark is origin network management configuration and has identical value in all node of same ring.If each ring has the value of a unique ring mark ring mark to be not equal to zero in MPLS-TP.At transmitting terminal, node increases ring mark and carrys out identification ring in APS PDU; At receiving terminal, Node extraction ring identifies and distributes APS PDU according to ring mark.Whether section layer between the two nodes can be shared between multiple ring is identify based on the ring in APS PDU.If the ring mark in APS PDU contained in this section of layer is zero, just cannot share with the section layer of other ring.If the APS PDU in section layer contains the ring mark of non-zero, and has multiple ring between the two nodes, this section of layer just can be shared with multiple ring, is finally that the port binding of multiple ring at this node realizes sharing at same section of layer by network management.If the APS PDU in section layer contains the ring mark of non-zero, but only has a ring between two nodes, this section of layer just need not be shared.
Traditionally, because do not have ring to identify in APS PDU, section layer is not between the two nodes shared between the rings.In order to support N number of ring, N number of port is needed in every side of node. when identifying with ring in APS PDU, just easily solve port restricted problem. when each ring has a unique ring to identify, this section of layer can be shared with N number of ring, just only a port is needed in the side of node, instead of N number of port, such port number just can greatly reduce.Such as, as shown in Figure 10, Node B (1001) supports three ring topologys.When not having ring to identify in APS PDU, Node B (1001) needs six ports and supports three rings.When having ring to identify in APS PDU, Node B (1001) needs four ports and supports three rings.And for example another one example, node J (1002) supports two rings, and when not having ring to identify in APS PDU, node J (1002) needs four ports; When having ring to identify in APS PDU, node J (1002) only needs two ports.Similar, node A (1003) and node C (1004) respectively supports two rings, but each node only needs three ports instead of four ports.
In order to compatible with the ring topology mechanism of standard, the default value of ring mark is set to zero.Ring is designated default value and means that the section layer of this ring can not be shared, and namely, a port of every side of node only supports a ring.If do not have ring to identify in the APS PDU that node receives, the value of ring mark just should use as default.By adding the default value of ring mark and definition ring mark in APS PDU, make the ring topology mechanism of the method and standard compatible.
It should be pointed out that above-described embodiment be for illustration of instead of restriction the present invention, and should be understood that, under the condition not departing from the spirit and scope of the present invention, modifications and variations as the skilled artisan will appreciate are fine and adopt.Such modifications and variations are considered to be within the scope of the invention and the appended claims.Defined by the appended claims in protection scope of the present invention.In addition, any Reference numeral in the claims should not be interpreted as limiting claim.Use verb " comprises " and variant does not get rid of not described in the claims element or the existence of step.Indefinite article "a" or "an" before an element or step does not get rid of the existence of multiple such element or step.
Claims (15)
1., for a method for the node in MPLS-TP ring topology, comprising:
Contain the first APS protocol Data Unit of route indicator from eastern neighbors receiving package, the described route indicator in described first APS protocol Data Unit indicates the east side RX path state of described node;
Contain the second APS protocol Data Unit of route indicator from western neighbors receiving package, the described route indicator in described second APS protocol Data Unit indicates the west side RX path state of described node;
Described ring topological structure is judged with the mark of described western neighbors according to described eastern neighbors; And
If it is determined that be the ring topology of two nodes, judge handover operation according to the described route indicator in described first and second APS protocol Data Units and source node identification.
2. the method for claim 1, is characterized in that, described two the internodal paths of route indicator instruction in the ring topological structure of described two nodes initiate request path or non-initiation request path; Described initiation request path represents APS request locking protection/force handoff/Signal Fail/manual switchover/Wait-to-Restore/practise initiating in described path; Described non-initiation request path represents the described path of the side away from described initiation request path.
3. the method for claim 1; it is characterized in that, the described route indicator in described first the APS protocol Data Unit in the ring topology of described two nodes and the described route indicator in described second protocol Data Unit arrange based on a local APS request.
4. the method for claim 1, is characterized in that, also comprises:
Send to described eastern neighbors the 3rd APS protocol Data Unit comprising route indicator, the described route indicator in described 3rd APS protocol Data Unit indicates east side transmit path state and arranges described route indicator according to described first APS protocol Data Unit; And
Send to described western neighbors the 4th APS protocol Data Unit comprising route indicator, the described route indicator in described 4th APS protocol Data Unit indicates west side transmit path state and arranges described route indicator according to described second APS protocol Data Unit.
5. the method for claim 1, is characterized in that, the step of described judgement handover operation comprises:
If the described source node identification in described first APS protocol Data Unit equals described western neighbors mark and described route indicator in described first APS protocol Data Unit is described non-initiation request path, perform the operation being switched to east side; Or
If the described source node identification in described second APS protocol Data Unit equals described eastern neighbors mark and described route indicator in the second APS protocol Data Unit is described non-initiation request path, perform the operation being switched to west side.
6. the method as described in claim 1 or 4, is characterized in that, each described route indicator takies 1 bit in corresponding APS protocol Data Unit.
7. the method for claim 1, is characterized in that, equals described western neighbors mark just judge the ring topological structure of described ring topological structure as described two nodes if the step of described judgement described ring topological structure comprises described eastern neighbors mark.
8. the node in the ring topology of MPLS-TP, comprising:
Receiver, it is configured to the first APS protocol Data Unit containing route indicator from eastern neighbors receiving package, and the described route indicator in described first APS protocol Data Unit indicates the east side RX path state of described node; Contain the second APS protocol Data Unit of route indicator from western neighbors receiving package, the described route indicator in described second APS protocol Data Unit indicates the west side RX path state of described node;
First identifying unit, it is configured to judge described ring topological structure according to described eastern neighbors with the mark of described western neighbors; And
Second identifying unit, if it is determined that it is configured to be the ring topology of two nodes, judges handover operation according to the described route indicator in described first and second APS protocol Data Units and source node identification.
9. node as described in claim 8, is characterized in that, also comprise:
Transmitter, it is configured to send to described eastern neighbors the 3rd APS protocol Data Unit comprising route indicator, and the described route indicator in described 3rd APS protocol Data Unit indicates east side transmit path state and arranges described route indicator according to described first APS protocol Data Unit; And sending to described western neighbors the 4th APS protocol Data Unit comprising route indicator, the described route indicator in described 4th APS protocol Data Unit indicates west side transmit path state and arranges described route indicator according to described second APS protocol Data Unit.
10. as described in claim 8 node, is characterized in that, equals described western neighbors mark just judge the ring topological structure of described ring topological structure as described two nodes if described first identifying unit is configured to described eastern neighbors mark.
11. nodes as claimed in claim 8, it is characterized in that, described second identifying unit is configured to
If the described source node identification in described first APS protocol Data Unit equals described western neighbors mark and described route indicator in described first APS protocol Data Unit is described non-initiation request path, perform the operation being switched to east side; Or
If the described source node identification in described second APS protocol Data Unit equals described eastern neighbors mark and described route indicator in the second APS protocol Data Unit is described non-initiation request path, perform the operation being switched to west side.
12. 1 kinds, for the method for the node in MPLS-TP ring topology, comprising:
Receive the first APS protocol Data Unit from first ring and receive the 3rd APS protocol Data Unit from the second articulating, described first APS protocol Data Unit comprises the first ring mark representing described first ring, and the ring mark of the described 3rd dynamic pretection switch protocol Data Unit comprises the second ring mark representing described second ring;
Described first ring identified embedding second APS protocol Data Unit and state in the second ring mark embedding the 4th APS protocol Data Unit by described;
Judge that section layer is shared according to the described first ring mark in described second APS protocol Data Unit and the described second ring mark in described 4th APS protocol Data Unit; And
Unless one in described ring mark is zero, in same section of layer, send the described second APS protocol Data Unit comprising first ring mark and the described 4th APS protocol Data Unit comprising the second ring mark to the neighbors of described node.
13. methods as claimed in claim 12, is characterized in that, the step that described judgement described section of layer is shared comprises:
If the value of described first ring mark and described second ring mark is respectively an integer value in 1 to 127, described section of layer between described node and described neighbors can be shared by described first ring and described second ring.
14. 1 kinds of nodes in the ring topology of MPLS-TP, comprising:
Receiver, it is configured to receive the first APS protocol Data Unit from first ring and receive the 3rd APS protocol Data Unit from the second articulating, described first APS protocol Data Unit comprises the first ring mark representing described first ring, and the ring mark of described 3rd APS protocol Data Unit comprises the second ring mark representing described second ring;
Plug-in unit, it is configured to described first ring mark embedding second APS protocol Data Unit and states in the second ring mark embedding the 4th APS protocol Data Unit by described;
Identifying unit, it is configured to judge that section layer is shared according to the described first ring mark in described second APS protocol Data Unit and the described second ring mark in described 4th APS protocol Data Unit; And
Transmitter; unless its of being configured in described ring mark is zero, in same section of layer, send the described second APS protocol Data Unit comprising first ring mark and the described 4th APS protocol Data Unit comprising the second ring mark to the neighbors of described node.
15. nodes as described in claim 14, it is characterized in that, if it is respectively an integer value in 1 to 127 that described identifying unit is configured to the value that described first ring mark and described second ring identify, judge that described section of layer between described node and described neighbors can be shared by described first ring and described second ring.
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