CN100375461C - Method for carrying out VPR protection inversion in network - Google Patents
Method for carrying out VPR protection inversion in network Download PDFInfo
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- CN100375461C CN100375461C CNB2005101056927A CN200510105692A CN100375461C CN 100375461 C CN100375461 C CN 100375461C CN B2005101056927 A CNB2005101056927 A CN B2005101056927A CN 200510105692 A CN200510105692 A CN 200510105692A CN 100375461 C CN100375461 C CN 100375461C
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Abstract
The present invention relates to a method for protecting and switching a virtual path ring (VP-ring) which realizes share in a ring network by adopting asynchronous transfer mode (ATM) technique. The method comprises: an APS cell containing warning information and a node space code address, which is defined by the present invention with I. 630 as a reference, is transmitted and received to detect the group state of a logic link. Thus, the protection switching for the millisecond stage response speed of logical layer service is realized. By modifying a routing list, nodes adopts the method of the present invention to perform the protection switching. When a certain node performs the protection switching for the service on the ring, the original service which is added to the ring by the node is added on a matching ring along with the protection switching, and the original service which is sequentially relayed by the node through the ring is also routed on the matching ring along with the protection switching. Thus, the method of the present invention has little damage for the service, and has high use ratio of band width. The method can be mutually matched with the automatic protection switching (APS) of synchronous digital hierarchy (SDH).
Description
Technical field
The present invention relates to realize the method that the protection of shared virtual path ring (VP-ring) is switched in the loop network that adopts the ATM(Asynchronous Transfer Mode) technology, this method can realize the protection of the Millisecond response speed of logical layer business is switched.
Background technology
At present, adopt the looped network of atm technology to be widely used in making up multiservice transport platform (MSTP).Wherein atm technology mainly is used to provide the link layer functionality with the friendly interface of other layer protocols, owing to ATM has the favorable service quality (QOS) that the multi-service rank is brought, fixing cell length and bring fast exchange, and asynchronous statistic multiplexing and the professional efficiently transmission that brings, and support dynamic and static connection-oriented Call Admission Control (CAC), perfect operation management maintain (OAM) function, and support reliable network traffics to control and congestion management techniques, thereby effectively transferring voice and digital video signal, make atm technology in looped network, be widely applied.
At home, atm technology mainly is integrated in based on synchronous digital hierarchy (SDH) technology and realizes access, processing and the transmission of business such as Time Division Multiplexing, ATM, Ethernet simultaneously and provide on the multiservice transport platform (MSTP) of united net management.Is that basic transmission network is complied with the service network growth requirement and the comprehensive solution that proposes by MSTP as the network node of SDH transmission network, and this scheme has merged the multiple key technology of ITU-T and the definition of other standardization bodies.
Usually, in order to strengthen the reliability of network, thereby consider to have used on the physical layer Self-healing Rings technology to form the SDH looped network during SDH networking, therefore, MSTP is also corresponding composition Multiple Service Ring shape net on the SDH looped network, and ATM business wherein just forms the ATM looped network.As shown in Figure 1, utilizing virtual path group (VPG) to connect the loop of setting up logical layer on the ATM looped network is virtual path ring (VP-ring), the virtual path ring utilizes ATM statistic multiplexing characteristic, provide convergence to business, realize encircling the VC4 virtual container of going up in all ATM nodes sharing SDH passages, thereby improve bandwidth availability ratio.Above-mentioned virtual path lopps is similar to physical slot by time or the circuit ring in the SDH system, and this virtual path loop technique obtained the approval of industry, for example 3G networking relevant criterion with VP-ring as a kind of important access scheme.
Usually the SDH network uses the Self-healing Rings protection, promptly realizes the APS (APS) of physical layer.The protection of this physical layer can disconnect or realizes automatically switching during the serious distortion of signal at physical layer link, and its outstanding advantage is its rapidity (less than 50ms), make communication service break period very weak point can recover normal.
But because the test point of switching condition is away from operation layer, the connection status of physical layer and the connection status of link layer are not to be equal to fully, exist link layer to break down and physical layer protection is switched situation about not being triggered; Moreover owing to reasons such as resource limit, existence can not provide the physical layer situation that protection is switched.Therefore; Alcatel-Lucent once proposed to utilize virtual path group (VPG) to protect the preliminary imagination of switching at logical layer, and this imagination disposes identical VPI to the logical links between identical sources and the destination node, constituted a virtual path group (VPG); the cluster logic channel, as shown in Figure 1.Communication is realized by the VP#12 link between the node 1 and 2; Communication between the node 1 and 6 is then by VP#16 link realization etc.These multiple sources and destination node group are to set up VP active link and protection link on the virtual path ring of sharing.The VP ring realizes being similar to the APS protection of SDH by on ring each VPG being utilized the oam cell bi-directional channel information of following, and this is the VPG protection.
Also define in the I.630 suggestion that ITU-T proposes VPG/VP and VCG/VC SNCP switched with end-to-end and be connected protection and switch, and defined the APS cell format that transmits the protection switch messages, thereby realize the protection of ATM layer.Because recommending to the utmost of communications equipment manufacturer; realize engineering test and the application standard that the protection of ATM layer is switched becomes the industry approval in 50 milliseconds of time periods, domestic industry also proposes at the virtual path ring of sharing must the simple relatively VPR protection inversion function of realization.Yet ITU-T does not propose the notion of the virtual path ring protection shared, and the response time that protection is switched to the ATM layer is not made concrete quantitative target yet.
As mentioned above, also there not be at present the proposition pratical and feasible method that the protection of 50 milliseconds of specific implementations is switched on the virtual path ring of the realization service convergence shared channel of widespread usage in the industry.
Summary of the invention
Purpose of the present invention just provides the method that the ATM layer protection that realize 50 milliseconds on a kind of virtual path ring in adopting the network of atm technology switched.
The know-why of VPR protection inversion method of the present invention is as follows:
Because the logic business link is very many in the practical application, monitor respectively and implement separately every link and protect shared bandwidth too big, very high to the disposal ability requirement of CPU, the protection cost can be very expensive.Usually only occurring causing just need to be switched to the protection route under the situation of thousands of link simultaneous faultss in actual applications, so just can allow one of all link sharing on the virtual path ring follow the detection link.In addition; owing to exist SDH protection and virtual path ring protection function overlapping; the present invention shares group of link formation of these rings to all of shared same virtual path ring, sets up one for link group and follows the detection link to transmit the I.630 APS cell that comprises warning information and node space coded address of protocol definition of the present invention's reference.
Each virtual path ring has the virtual path ring of another direction of rotation, is called the pairing virtual path ring of this virtual path ring, and above-mentioned paired virtual path ring also abbreviates this ring and pairing ring as.When former virtual path ring has fault, the link that needs protection will be switched on the pairing virtual path ring, and vice versa.After the business on the former virtual path ring is switched, business on the pairing virtual path ring might be congested, but utilize the business-level relation of ATM, guaranteed to be switched professional proper communication, the bandwidth of the supplementary services such as Available Bit Rate (ABR) business of normal transmission will be restricted and pairing encircles upward.So just utilized the feature of QOS and the statistic multiplexing of ATM, thus more efficient use the bandwidth of network.Therefore, what the present invention realized is protection in 1: 1, and does not have active and standby branch with ring, and promptly pairing ring and this ring function are symmetrical fully.
In above-mentioned virtual path ring a plurality of nodes are arranged, the section of being called between adjacent two nodes utilizes virtual path to connect the oam cell stream of level, detects each section on the virtual path ring piecemeal, and realizes the protection of logic link layer piecemeal.If promptly which section has fault, then sending information switching is transmitted to the pairing ring at the end node as information source on this section, this switches particularly and realizes by revising routing table.Thereby, even certain section has fault in the virtual path ring that multilink is shared, still can operate as normal, satisfy proper communication.For realizing this purpose, be connected with the pairing ring by this ring between per two adjacent nodes in network, on this ring and pairing ring, all be provided with and follow the detection link accordingly, two nodes are source node and destination node each other.It also is to constitute to detect the link ring with detecting link that this ring and pairing ring are gone up each section, detecting on the link according to I.630 advising sending and terminating the APS cell between each node and the adjacent node, and judge between two nodes by APS cell content whether whether section has fault, carry out switching operation.
The detection type of fault warning in the APS cell is similar to the detection method of Content of Communication (CC) cell, but in order to reach the response of 50ms, the interval T that node sent and received the APS cell that contains measuring ability is a Millisecond; The detection cell that node sends to adjacent node is exactly the APS cell of virtual path level, sender node is by the transmission on this ring or pairing ring of the other APS cell of designated ends oral region in the extension header of APS cell, receiving terminal node is also distinguished this cell from this ring or pairing ring by the port that receives the APS cell, carries warning information in the APS cell field; Sender node is being sent when containing the APS cell of warning information the space encoding address of sending the node of alarm in the APS cell by the information representation of node place net piece, network element and groove position.Node on each this ring detects from following that link receives and termination APS cell every the T time as the node of this ring destination, and also the node as the source end of this ring detects the APS cell that link sends the reflection current state downwards every the T time along following.Node on the pairing ring is receiving and is sending the APS cell as this ring every the T time.Therefore, in each node on a pair of virtual path ring, each node will issue 2 APS cells every the T time, and 2 APS cells also will receive and terminate.For making node can receive the APS cell smoothly, divide two T/2 time periods of position with the T time period, each node cell receives and sends APS cell on this ring in first T/2 time period, receive and send the APS cell that pairing encircles in time period at second T/2, it still is the T time period that each ring is gone up the cycle that sends and receive the APS cell.
Because this ring and pairing ring are symmetrical fully, serve as to describe main body only with this ring, VPR protection inversion method of the present invention comprises the steps: at a T in cycle time period, if the upstream node that node receives from this ring sends the APS cell, judge and whether comprise warning information in this cell, if do not comprise warning information, node this APS cell that will terminate, and send the APS cell to downstream node by the detection link of this ring; If node is not received APS cell from upstream node from this articulating at T in the time period, then enter pre-alarm, also confiscate APS cell as the next T time period from upstream node, then this node sends the APS cell by this hoop downstream node, comprises the space encoding address of virtual path alarm indication (VP_AIS) and this node in this cell; Simultaneously, this node also by sending the APS cell with this upstream node that encircles described ring of rightabout pairing hoop, comprises the space encoding address of virtual path far-end faulty indication (VP_RDI) and this node in this cell; After downstream node on this ring receives the APS cell that comprises VP_AIS information, this APS cell and interpretation space encoding address wherein terminates, if the space encoding address is not this node address, then the APS cell is inserted by the adjacent downstream node transmission of this hoop in above-mentioned space encoding address and VP_AIS information; If this ring upstream node is received the APS cell that comprises VP_RDI information from downstream node from the pairing articulating, this APS cell terminates, and the information in the deciphering APS cell, when judging that wherein comprise VP_RDI and its space encoding address is the adjacent downstream node address, assert then between upstream node and the downstream node that virtual path by this ring is connected and break down, this upstream node enters the protection switch status, and promptly this upstream node should mail to this and encircle all business and change into and mail to the pairing ring by changing routing table; In addition, if upstream node is received the APS cell from this ring, this APS cell and judge space encoding address and the VP_AIS information that comprises the adjacent downstream node in the cell terminates, assert then between upstream node and the downstream node that virtual path by this ring is connected and break down, this upstream node enters the protection switch status, and promptly this upstream node should mail to this and encircle all business and change into and mail to the pairing ring by changing routing table; If node is received the APS cell by this articulating, this APS cell and understand wherein information terminates, if judge the space encoding address and the VP_AIS information that wherein comprise this node, judge then between this node and the upstream node that virtual path by this ring is connected fault and eliminates, this node go up to detect in the APS cell that link sends to downstream node by this ring and no longer comprises VP_AIS information, and this node is gone up to detect in the APS cell that link sends to upstream node by the pairing ring and also no longer comprised VP_RDI information; Upstream node no longer detects the link reception by the pairing ring and comprises the APS cell of downstream node space encoding address and VP_RDI information and no longer receive the APS cell that comprises downstream node space encoding address and VP_RDI information by this ring detection link; assert that then the virtual path by this ring is connected recovery between upstream node and the downstream node; this upstream node stops the protection switch status; recover normal condition, promptly recover all business that original routing table will send to this ring originally still the virtual path by this ring connect and send.
In the said method; the node execute protection switches that routing table realizes by revising; a certain node is when professional execute protection is switched on this ring; originally the business by talking about this ring on this node also will with protection switch by on talk about on the pairing ring, originally the business that continues relaying by this node by this ring also will be switched and is routed to match and encircles with protection.Therefore, the protection of the inventive method is switched just and change routing table on the node that execute protection is switched, and other node be there is no any operation requirement, and service damage is littler and bandwidth availability ratio is better like this.In addition; when adopting method of the present invention to carry out VPR protection inversion; certainly also can and the protection of synchronous digital hierarchy (SDH) switch (APS) and cooperatively interact; usually before carrying out VPR protection inversion of the present invention; the wait transmission system is carried out the SDH protection and is switched; only do not carry out the SDH protection and switch under the situation, just carry out VPR protection inversion of the present invention in transmission system.
Above-mentioned VPR protection inversion method of the present invention also goes for the situation of two pairs of virtual path rings, for example is connected with two pairing rings with two these rings between each node.At this moment the control channel of the shared ATM layer of each node meeting detects transmitting-receiving APS cell on the links at 4.For guaranteeing that the APS cell normally plays a role, needing that then each ring is gone up the transmitting-receiving time of detecting link stipulates, for example under total APS cell transmitting-receiving cycle is the situation of T time period, this time period is divided into four sub-time periods, each node only takies the APS cell that detects link on wherein ring of T/4 time period sending and receiving, and this processor unit (CPU) that will help in the node device is in time handled the APS cell that each detects link.For example, under two pairs of virtual path ring situations, CPU receives and sends the APS cell in the node device on the detection link of first T/4 time period at first ring, on the detection link of the first pairing ring, receive and send the APS cell second T/4 time period, on the 3rd the detection link of T/4 time period, receive and send the APS cell, on the detection link of the second pairing ring, receive and send the APS cell the 4th T/4 time period at second ring.But because the initialization asynchronism(-nization) of each node device, certain node is at random with respect to the initial moment in T cycle of adjacent node, perhaps because CPU operation may be by other higher level tasks influences in the node device, cause the node may be asynchronous with adjacent node to the transmitting-receiving of APS cell.For example under above-mentioned two pairs of virtual path ring situations, should receive the APS cell that detects link on first ring in time period at first T/4 of this node, received that but the first pairing ring upward detects the APS cell of link, this moment, node device can adopt the sliding steps technology to regulate the time period that each detects reception APS on the link, think that promptly the APS of this node this receptions next time should be the APS cell of second ring detection link, maximum like this through 4 T time periods just can be with synchronous between APS cell cycle of node and the adjacent node.
Method of the present invention is the professional detection protection of having carried out logical layer in the ATM looped network, guaranteed the reliability of logical links layer service, and every link all has independent flexibility that whether need to select the virtual path ring protection.Method of the present invention is utilized statistic multiplexing and the QOS feature of ATM, switches by the protection that the modification routing table just can realize 1: 1, thus more efficient use bandwidth and littler relatively to service damage.The function of considering ring protection of a lot of situation virtual path and SDH protection is overlapping, and the present invention has also realized the application that cooperatively interacts that protection is switched with SDH.Method utilization sliding steps technology of the present invention makes node device not need higher running environment and configuration, thereby can be transplanted to any system easily, also can support the many virtual path ring is detected simultaneously with running protection to switch.Along with the development of mobile communication business, in following 3G business, the virtual path loop technique will be widely used in communicating with Inverse Multiplexing over ATM business (IMA), realize converging of IMA business.Like this, virtual path ring protection of the present invention has guaranteed the 3G service security from Business Logic, thereby improves the 3G QoS.
Description of drawings
Fig. 1 is the ATM ring network structure schematic diagram of all nodes sharing virtual path rings;
Fig. 2 is at the schematic diagram of this ring disconnection in the ring structure shown in Figure 1;
Fig. 3 is the direction of the words up and down schematic diagram that two rings shown in Figure 1 just often are provided with on the virtual path ring between the adjacent node;
Fig. 4 is this ring and the direction of the words up and down schematic diagram that encircles the back virtual path ring under the protection switch status that opens circuit that matches between adjacent node shown in Figure 3;
Fig. 5 is two pairs of ring network structure schematic diagrames under the virtual path ring situation;
Fig. 6 is the schematic diagram of APS cell format of the present invention;
Fig. 7 is the flow chart that the inventive method is switched at the node processing APS cell and the execute protection of this ring.
Embodiment
APS cell format of the present invention as shown in Figure 6.For inserting the vpi/vci value of choosing an ITU-T reservation for the respective detection link in the APS header (header).
Fig. 1 is the ring structure schematic diagram of all nodes sharing virtual path rings, establishes dextrorotation veer service data transmission among the figure and is marked as 0 ring and represent this ring, and the ring of mark 1 is its pairing ring.In the explanation, APS_0 represents to go up the APS cell that detects the link transmission by this ring below, and APS_1 represents to go up the APS cell that detects the link transmission by the pairing ring.In whole ring shown in Figure 1; each node sends an APS cell to adjacent node respectively every 10 milliseconds on 0 ring and 1 ring; and APS cell of corresponding reception; the data that analysis receives; carry out the corresponding protection switching operation, the data that send next time send by agreement according to the result of last time then.The APS that each node termination is received sends new APS downwards by agreement then.
For example, node 6 repeats following steps when proper communication:
1. because there is no any warning information in the APS_0 cell that received in last 10 millisecond periods, send the APS_0 cell that does not comprise warning information to give node 7 toward 0 environment-development from node 5;
2. go up the APS_0 cell that receiving node 5 is sent from 0 ring;
3. read this APS_0 cell content, do not find warning information;
4. require this node to be in non-switch status on the protection switching operation;
5. because there is no any warning information in the APS_1 cell that received in last 10 millisecond periods, send the APS_1 that does not comprise with nowhere to turn to the police to give node 5 toward 1 environment-development from node 7;
6. go up the APS_1 cell that receiving node 7 is sent from 1 ring;
7. read APS_1 cell content, find there is no warning information;
8. require this node to be in non-switch status on the protection switching operation.
Fig. 2 represents in the ring structure shown in Figure 1 schematic diagram in this ring disconnection, as shown in Figure 2, the link that 0 ring is gone up between the node 6 to 7 connects disconnection, and then node 7 can't normally receive the APS_0 cell from node 6, and each node is taked following steps according to method of the present invention:
1. node 7 detects link and sends to the space encoding address of inserting VP_AIS information and node 7 immediately in the APS_0 cell of node 8 on by 0 ring;
2. these APS_0 cells of node 8 termination, read this cell and find wherein to include VP_AIS information, but the space encoding address in this cell is not the address of node 8, so node 8 continuation transmit this VP_AIS information by the ASP_0 cell and node 9 is given in the space encoding address;
3. node 9 and subsequent node all continue to transmit the cell that comprises this VP_AIS information and address by the detection link of 0 ring, until node 6;
4. node 7 also send the APS_1 cell that comprises VP_RDI information and node 7 space encoding addresses to give node 6 by 1 environment-development immediately;
5. after node 6 is received this APS_1 cell, read wherein information, judge with the adjacent downstream node between this loop chain road is connected fault, should with node 6 encircle the service protection that sends by 0 and be switched to 1 and encircle;
6. node 6 is checked and is found that this node is not at the protection switch status, and just the preferential execute protection of wait SDH is switched earlier, and the stand-by period is provided with for example 60 milliseconds;
7. after 60 milliseconds, if switching, the SDH protection do not carry out, node 6 is by checking reception APS cell content, discovery receives the space encoding address that still comprises VP_AIS information and node 7 in the APS_0 cell by 0 ring or finds to encircle the space encoding address that still comprises VP_RDI information and node 7 in the APS_1 cell that is received by 1, assert then that section 0 a loop chain road is connected between node 6 and the node 7 and break down, node 6 enters the protection switch status, promptly changes into and mails to 1 ring by revising business that routing table will mail to 0 ring originally;
8. after 60 millimeters, if switching, the SDH protection is performed, then node 7 can be by the normal APS_0 cell that receives from node 6 of 0 ring, node 7 no longer goes out to comprise the APS_0 cell of VP_AIS information by 0 environment-development, also not at the APS_1 cell that goes out to comprise VP_RDI information by 1 environment-development, node 6 finds that node 7 is by no longer comprising VP_RDI and node 6 discovery nodes 5 by no longer comprising the space encoding address of VP_AIS information and node 7 in the next APS_0 cell of 0 environment-development in the next APS_1 cell of 1 environment-development in such cases, thereby the link of section 0 ring is connected the fault disappearance between decision node 6 and the node 7, need not enter the protection switch status;
9. even 0 of section ring is connected equal fault with 1 loop chain road between node 6 and node 7; node 7 can't contain the APS_1 cell of VP_RDI information by 1 articulating packet receiving; node 6 still can be analyzed by the VP_AIS information in the 0 APS_0 cell received of ring and the space encoding address of node 7; the 0 loop chain road of assert between node 6 and the node 7 section is connected breaks down; thereby decision node 6 should enter the protection switch status, and execute protection is switched.
In a pair of virtual path ring shown in Fig. 1,2, comprise this ring and a pairing ring, 10 milliseconds APS cell sense cycle is divided into two 5 milliseconds time period, each node sends on the detection link at this ring in first 5 milliseconds of time periods, receives the APS_0 cell in the looped network, sends, receives the APS_1 cell in second 5 milliseconds time periods on the detection link of pairing ring.
Shown in accompanying drawing 3 and 4, establish normal state before breaking when 72 rings of node 6 and node all break and the attitude of switching of having no progeny and compare.For simplicity, do not mark the continuous part of two rings and other nodes among Fig. 3,4.
VPR protection inversion method of the present invention is carried out by the CPU in the node device; wherein performed function is included in to follow to detect on the link and sends; receive the APS cell; judge and detect Link State and send the APS cell that comprises warning information; wait SDH execute protection is switched; carry out VPR protection inversion etc.; also comprise in the receiving function and receive the APS cell; judge between this node and the adjacent node whether asynchronous in the cycle that sends and receive the APS cell; and the corresponding sliding steps technology of taking is adjusted; the alarming processing function is by analyzing the APS cell data and forming warning information; switch latency function and be and consider and SDH cooperates and the stability of loop and the time waiting done, to carry out function then be all relevant links to be carried out roads go out change realization logical layer and switch thereby protection is switched.
Fig. 5 represents to adopt the ring network structure schematic diagram of two pairs of virtual path rings.In ring network structure shown in Figure 5, this ring is expressed as 0 ring in first pair of virtual path ring, and the pairing ring is expressed as 1 ring, and this ring is expressed as 2 rings in second pair of virtual path ring, and the pairing ring is expressed as 3 rings.10 milliseconds APS cell sense cycle is divided into 4 2.5 milliseconds time period, each node device CPU handled 0 ring APS cell in first 2.5 milliseconds of time periods in the ring, in second 2.5 milliseconds time periods, 1 ring APS cell is handled, in the 3rd 2.5 milliseconds time periods, 2 ring APS cells are handled, in the 4th 2.5 milliseconds time periods, 3 ring APS cells are handled.
Fig. 6 is an APS cell structure schematic diagram.Wherein cell length is 53 bytes, header (Header) accounts for 5 bytes, OAM type and function type account for a byte jointly, the warning information of 45 bytes and by the node space coded address of net piece, network element, the information representation of groove position subsequently, last reservation position (Unused) and cyclic redundancy are delivered for a check position (CRC) and are accounted for 6 and 10 2 bytes altogether respectively.
Fig. 7 is the flow chart of the performed the inventive method step of each node.Consider that this ring and pairing ring are symmetrical, for accompanying drawing for purpose of brevity, just provide among Fig. 7 this ring fault protected the step of switching.If desired pairing ring fault is protected and switched, those skilled in the art can be according to the protection switchover mode of this ring, and the ring that correspondingly is applied to match just can be carried out the protection of pairing ring is switched.
Claims (8)
1. VPR protection inversion method that is used for the ATM looped network, this virtual path ring is made up of this ring and pairing ring institute, and this method comprises the steps:
At a T in cycle time period, if the upstream node that node receives from this ring sends the APS cell, judge whether comprise warning information in this cell, if do not comprise warning information, node this APS cell that will terminate, and send the APS cell to downstream node by the detection link of this ring;
If node is not received APS cell from upstream node from this articulating at T in the time period, then enter pre-alarm, also confiscate APS cell as the next T time period from upstream node, then this node sends the APS cell by this hoop downstream node, comprises the space encoding address of virtual path alarm indication VP_AIS and this node in this cell;
This node also by sending the APS cell with this upstream node that encircles described ring of rightabout pairing hoop, comprises the space encoding address of virtual path far-end faulty indication VP_RDI and this node in this cell;
After downstream node on this ring receives the APS cell that comprises VP_AIS information, this APS cell and interpretation space encoding address wherein terminates, if the space encoding address is not this node address, then the APS cell is inserted by the adjacent downstream node transmission of this hoop in above-mentioned space encoding address and VP_AIS information;
If this ring upstream node is received the APS cell that comprises VP_RDI information from downstream node from the pairing articulating, this APS cell terminates, and the information in the deciphering APS cell, when judging that wherein comprise VP_RDI and its space encoding address is the adjacent downstream node address, assert then between upstream node and the downstream node that virtual path by this ring is connected and break down, this upstream node enters the protection switch status, and promptly this upstream node should mail to this and encircle all business and change into and mail to the pairing ring by changing routing table;
If upstream node is received the APS cell from this ring, this APS cell and judge space encoding address and the VP_AIS information that comprises the adjacent downstream node in the cell terminates, assert then between upstream node and the downstream node that virtual path by this ring is connected and break down, this upstream node enters the protection switch status, and promptly this upstream node should mail to this and encircle all business and change into and mail to the pairing ring by changing routing table;
If node is received the APS cell by this articulating, this APS cell and understand wherein information terminates, if judge the space encoding address and the VP_AIS information that wherein comprise this node, judge then between this node and the upstream node that virtual path by this ring is connected fault and eliminates, this node go up to detect in the APS cell that link sends to downstream node by this ring and no longer comprises VP_AIS information, and this node is gone up to detect in the APS cell that link sends to upstream node by the pairing ring and also no longer comprised VP_RDI information;
Upstream node no longer detects the link reception by the pairing ring and comprises the APS cell of downstream node space encoding address and VP_RDI information and no longer receive the APS cell that comprises downstream node space encoding address and VP_RDI information by this ring detection link; assert that then the virtual path by this ring is connected recovery between upstream node and the downstream node; this upstream node stops the protection switch status; recover normal condition, promptly recover all business that original routing table will send to this ring originally still the virtual path by this ring connect and send.
2. according to the described method of claim 1; it is characterized in that: the node execute protection switches that routing table realizes by revising; be node when professional execute protection is switched on this ring; originally the business by talking about this ring on this node also will with protection switch by on talk about on the pairing ring, originally the business that continues relaying by this node by this ring also will be switched and is routed to match and encircles with protection.
3. according to the described method of claim 1; it is characterized in that: node is when carrying out VPR protection inversion; certainly also can switch APS with the protection of synchronous digital hierarchy SDH cooperatively interacts; be that node is before carrying out VPR protection inversion; the wait transmission system is carried out the SDH protection and is switched; only do not carry out the SDH protection and switch under the situation, just carry out VPR protection inversion in transmission system.
4. according to the described method of claim 3, it is characterized in that: wait for that the time that transmission system execution SDH protection is switched is 60 milliseconds.
5. according to the described method of claim 1, it is characterized in that: the described T time period is divided into two T/2 time periods, the APS cell of described node on first T/2 time period sending and receiving and this ring of analyzing and processing detection link, the APS cell on second T/2 time period sending and receiving and analyzing and processing pairing ring detection link.
6. according to the described method of claim 5, it is characterized in that: the described T time period is 10 milliseconds.
7. according to the described method of claim 1, it is characterized in that: when the ATM looped network is under two pairs of ring situations, the described T time period is divided into four T/4 time periods, described node was received in first T/4 time period, send out with first of analyzing and processing and encircle the APS cell that detects on the link, receive second T/4 time period, send out and the analyzing and processing first pairing ring detects APS cell on the link, receive the 3rd T/4 time period, send out with second of analyzing and processing and encircle the APS cell that detects on the link, receive the 4th T/4 time period, send out and the analyzing and processing second pairing ring detects APS cell on the link.
8. according to the described method of claim 1, it is characterized in that: described APS cell total length is 53 bytes, header Header accounts for 5 bytes, OAM type and function type account for a byte jointly, the warning information of 45 bytes and by the node space coded address of net piece, network element, the information representation of groove position subsequently, last reservation position Unused and cyclic redundancy are delivered for a check a CRC and are accounted for 6 and 10 respectively and amount to 2 bytes.
Priority Applications (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101051995B (en) | 2006-06-05 | 2012-07-04 | 华为技术有限公司 | Protection switching method based on no connection network |
| CN101197745B (en) * | 2007-12-21 | 2011-07-27 | 深圳市三旺通信技术有限公司 | Method for implementing looped network redundant data transmission |
| CN101222405B (en) * | 2007-12-25 | 2010-07-14 | 深圳市三旺通信技术有限公司 | Module for fast recovering looped network redundancy and its use method |
| CN101764746B (en) * | 2009-12-17 | 2012-07-18 | 中国电力科学研究院 | Method and device for sending data |
| CN102136944A (en) * | 2011-01-18 | 2011-07-27 | 华为技术有限公司 | Permanent virtual connection (PVC) link establishment method, device and system |
| CN105099543B (en) * | 2015-07-09 | 2017-12-22 | 北京宇航系统工程研究所 | A kind of network fast protection method of SDH equipment |
| CN107018081B (en) * | 2017-03-15 | 2020-05-05 | 烽火通信科技股份有限公司 | Method for realizing point-to-multipoint 1+1 protection |
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| CN1295397A (en) * | 1999-11-04 | 2001-05-16 | 深圳市中兴通讯股份有限公司 | Automatically protected switching method and device in high rate SDH loop |
| CN1567805A (en) * | 2003-06-17 | 2005-01-19 | 中兴通讯股份有限公司 | Channel sharing ring protection supported protection switching protocol implementing method |
| US6876660B1 (en) * | 1999-02-16 | 2005-04-05 | Cisco Technology, Inc. | Method for implementing automatic protection switching (APS) using cell replication |
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| WO1998021855A1 (en) * | 1996-11-12 | 1998-05-22 | Kabushiki Kaisha Toshiba | Loop-type network system and controlling of path thereof |
| US6876660B1 (en) * | 1999-02-16 | 2005-04-05 | Cisco Technology, Inc. | Method for implementing automatic protection switching (APS) using cell replication |
| CN1295397A (en) * | 1999-11-04 | 2001-05-16 | 深圳市中兴通讯股份有限公司 | Automatically protected switching method and device in high rate SDH loop |
| CN1567805A (en) * | 2003-06-17 | 2005-01-19 | 中兴通讯股份有限公司 | Channel sharing ring protection supported protection switching protocol implementing method |
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