CN100414881C - Method for implementing range managing OAM information element - Google Patents
Method for implementing range managing OAM information element Download PDFInfo
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- CN100414881C CN100414881C CNB2005100534813A CN200510053481A CN100414881C CN 100414881 C CN100414881 C CN 100414881C CN B2005100534813 A CNB2005100534813 A CN B2005100534813A CN 200510053481 A CN200510053481 A CN 200510053481A CN 100414881 C CN100414881 C CN 100414881C
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- oam
- management domain
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Abstract
The present invention relates to a method for realizing OAM cells which are managed by dividing regions. The method is mainly based on the information of a built-in OAM management domain with a pre-reserved field record in an OAM cell format. Thereby, the layered management for an OAM network element is realized, and the OAM cells can be accurately ended by a corresponding section /a terminal point. Thus, the present invention realizes that the OAM cell transmitted in the network can pass through the OAM management domain which is nested at the middle part of the network, and the OAM cell can be exactly received in a corresponding region in order to carry out exact protection switching operation so as to ensure the reliable transmission of the service. Thereby, the present invention solves the problem that the OAM cells can not pass through the OAM management domain which is nested at the middle part of the network existing in the prior art.
Description
Technical field
The present invention relates to network communications technology field, relate in particular to a kind of method that realizes range managing OAM information element.
Background technology
According to I.610 suggestion description, in ATM (asynchronous transfer mode) transmission system,, provide the OAM (operation and maintenance) that is used to detect network state, locating network fault in a large number cell for the ease of network operation.When the oam cell maintaining network, the section of setting point or end points earlier, on described section point or end points, can handle corresponding section/hold the oam cell of type.
Be example with seg_AIS (section alarm indication) cell below, the transmission course of oam cell in network described, as shown in Figure 1, the A network element in Fig. 1 to the connection of D network element, the A network element back to the forward direction of the D network element section of being set to point respectively.
At this moment, if the A network element is disconnected fine to taking place between the B network element, just the B network element can descend to insert the seg_AIS cell, owing to the C network element section of being/end points not, so the C network element can be with this seg_AIS cell transparent transmission, when described cell arrives the D network element, because the D network element section of being point, so the seg_AIS cell is hunted down, report the seg_AIS alarm, when D point network element is caught ais cell, return and insert a seg_RDI cell, return and accuse network failure.Equally, because B, the C network element section of setting point not all so the RDI cell is caught by the section point of A network element, reports the RDI alarm.
By foregoing description as can be seen, when oam cell transmitted in network, as long as through section point or end points, then section point or end points will be handled it, and promptly oam cell can't the section of passing point or end points.And in real network, may wish that according to managerial demand oam cell can pass middle section point or end points, and at the section point or the end points of appointment it is handled, so that realize sectional network management.
As shown in Figure 2, in the frame of broken lines among the figure management domain, be positioned at disconnected fine place between A network element and B network element for being in outside this management domain.Therefore, the E network element does not need to be concerned about as section point because the ais cell that produces when disconnected fine outside the management domain, that is to say that this ais cell should be caught and be handled by the G network element.But by I.610 advising regulation, a section point E network element will report ais alarm owing at first having received this cell.Cause sectional network management to realize.
And, according to I.630 advising stipulating that ais cell can trigger Vpring (virtual path ring) protection of ATM and switch, and therefore at the two ends of protected field, should catch ais cell by the section of setting point, as shown in Figure 3.Still referring to Fig. 2; if optical fiber breaks down between AB; and the E network element is received ais cell and is handled; then no matter how the protected field between B network element and the E network element is switched; all can't play the professional effect of protection; and correct protected mode should be to allow the G network element capture this ais cell, and starts the A network element and protect with VPring between the G network element and switch, and so just can provide real service protection.
Yet at present, if optical fiber breaks down between the AB network element among Fig. 2, and when E network element and the G network element section of being point, the G network element can't be received described ais cell, promptly can't carry out correct protection switching operation, to guarantee the reliable transmission of business.
Summary of the invention
In view of above-mentioned existing in prior technology problem; the purpose of this invention is to provide a kind of method that realizes range managing OAM information element; the oam cell that transmits in network can accurately be received in corresponding zone; thereby carry out correct protection switching operation, guarantee the reliable transmission of corresponding service.
The objective of the invention is to be achieved through the following technical solutions:
The invention provides a kind of method that realizes range managing OAM information element, comprising:
The starting point and the endpoint information of the OAM management domain of process discerned and write down to the Operation and Maintenance oam cell in transport process;
When described oam cell through section or end points, and when determining that according to the information of record described oam cell does not pass through the starting point of OAM management domain of this section or end points correspondence, this section or end points this oam cell that terminates then; If when determining described oam cell through the starting point of the OAM management domain of this section or end points correspondence according to the information of record, this section or end points this oam cell that do not terminate.
This method comprises:
At oam cell in transport process, the starting point of OAM management domain of record process and the quantity information of endpoint information;
Section/end points determines according to the starting point of the OAM management domain of the process of oam cell record and the quantity information of end point whether it passes through the starting point of the OAM management domain of this section or end correspondence.
This method comprises:
The management domain attribute field is set in oam cell, and initial value is 0, and the node of slotting oam cell is the starting point of OAM management domain instantly, and then the initial value of management domain attribute field is set to 1;
When oam cell through section or during end points, judge whether described section or end points are the starting point of OAM management domain, if, then described attribute field is added 1, and continues transmission, otherwise,
Whether the value of judging the attribute field in the described oam cell according to the value of described attribute field is 0, if, then determine the starting point that this oam cell does not pass through the OAM management domain of this section or end points correspondence, and by this section or end points this oam cell that terminates, otherwise, described banner word segment value is subtracted 1, and continue to transmit.
Described management domain attribute field is: the reserved field in the oam cell.
This method also comprises:
When oam cell process end type OAM management domain destination node, the oam cell that then direct termination is received.
Before the step of the starting point of carrying out the OAM management domain of discerning and write down process and endpoint information, this method also comprises:
The starting point and the end point flag information of each OAM management domain are set, determine according to described flag information whether each section or end points are the starting point or the end point of OAM management domain.
Describedly the starting point of each OAM management domain is set and the step of end point flag information also comprises:
The flag information of the starting point and the end point of embedded OAM management domain only is set.
As seen from the above technical solution provided by the invention; the present invention has realized at the with different levels management in the subregion of oam cell; thereby realized that the oam cell that transmits can pass through each middle nested OAM management domain in network; and received exactly by node corresponding; carry out the corresponding protection switching operation, and then guaranteed reliability of service transmission in the network effectively.Therefore, the invention solves the oam cell that exists in the prior art and can't pass through the section of middle OAM management domain or the problem of end.
Description of drawings
Fig. 1 is the transport process schematic diagram of oam cell in the segment protection;
Fig. 2 is a possibility abnormal conditions schematic diagram in the prior art;
Fig. 3 is the transport process schematic diagram of oam cell in the ring protection;
Fig. 4 is the form schematic diagram of oam cell;
Fig. 5 is the flow chart of method of the present invention;
Fig. 6 is oam cell transport process schematic diagram during slotting cell under the intermediate point;
Fig. 7 is an oam cell transport process schematic diagram when inserting cell under the management domain starting point;
Fig. 8 is oam cell transport process schematic diagram during disconnected fine down slotting cell before the intermediate point;
Fig. 9 is the oam cell processing mode schematic diagram of end type management territory destination node.
Embodiment
Core of the present invention is that the starting point of the OAM management domain of oam cell process and endpoint information are carried out record, thereby strides across middle nested OAM management domain according to the information of record, guarantees that oam cell is received exactly by corresponding section/end points.
The concrete method that adopts can be: at oam cell in transport process, the starting point of the OAM management domain of record process and the quantity information of endpoint information; Then, section/end points is according to the starting point of the OAM management domain of the process of oam cell record and the quantity information of end point, as the quantity according to record is that odd number or even number are determined the starting point whether it passes through the corresponding OAM management domain of this section/end, promptly need this oam cell that terminates, and handle accordingly.
The method that is adopted can also be: the management domain attribute field is set in oam cell, and initial value is 0; In transmission course, when passing through the starting point of OAM management domain, described attribute field is added 1 at oam cell, the end point when through the OAM management domain then subtracts 1 with described attribute field; Then, when described oam cell passes through section/end points,, then determine the starting point that this oam cell does not pass through the OAM management domain of this section/end points correspondence, promptly need this oam cell that terminates, and handle accordingly if described banner word segment value is 0.
The present invention mainly is based on reserved field in the oam cell form and realizes management by different level at the OAM network element; promptly adopt the attribute field of described reserved field as management domain; thereby the oam cell that transmits in the realization network can pass through middle nested OAM management domain; and in corresponding zone, accurately received; to carry out correct protection switching operation, guarantee professional reliable transmission.
The reference format of described OAM network element wherein, comprises reserved field Reservedfor future use as shown in Figure 4, and the present invention utilizes the multi-zone supervision of the reserved field realization of this 6bits at OAM information just.Promptly, realize the multi-zone supervision function of oam cell by described reserved field is expanded.
To be example below, the specific implementation of method of the present invention will be described that as shown in Figure 5, described method specifically may further comprise the steps with the present invention who realizes based on the oam cell reserved field:
Step 51: when under the needs during slotting oam cell, whether what at first judge slotting oam cell point down is the starting point of OAM management domain, if then execution in step 53, otherwise, execution 52;
Step 52: the value of the reserved field in the oam cell is set to 0, and execution in step 54;
Step 53: determine the starting point that this network element node is the OAM management domain, and the value of the reserved field in the oam cell is set to 1, and execution in step 54;
Step 54: when described oam cell during, judge the whether starting point of the management in OAM territory of described section/end points through section/end points, if then execution in step 55, otherwise, execution in step 56;
Among the present invention, be provided with the flag information of the starting point and the end point of management domain respectively, so that judge whether corresponding section/end points is the starting point or the end point in OAM territory at each OAM management domain; Starting point and end point at management domain can be caught oam cell, and handle accordingly; Under the nested situation of a plurality of OAM management domains, only need to be provided with the starting point and the end point flag information of the OAM management domain (being embedded OAM management domain) that is nested in other OAM management domains, and outermost management domain does not need to be provided with the starting point and the end point of management domain, only need handle getting final product as section/end points to oam cell in end point;
The starting point of OAM management domain and end point have segment type and hold two kinds of types, same as the prior art, segment type management domain point can only treatment S eg_OAM (section OAM) cell, and the management domain point of end type treatment S eg_OAM and two kinds of oam cells of End_OAM (holding OAM) simultaneously;
Step 55: then the reserved field value in the oam cell is added 1, and continue execution in step 54;
In the management domain starting point, analyze the oam cell of catching, the reserved field 6bit value of ifndef is less than 63, then add 1, continuation is inserted this oam cell down, otherwise, when promptly this reserved field value is maximum 63,, need abandon this oam cell owing to can't correctly handle;
Step 56: determine that described section/end points is the end point of OAM management domain, judge then whether the value of the reserved field in the oam cell is 0, if then execution in step 57, otherwise, execution in step 58;
In the management domain end point, analyze the oam cell of catching, the reserved field 6bit of ifndef is not 0, then this reserved field is subtracted 1 and handles, continuation is inserted this oam cell down.Otherwise, directly catch oam cell and handle by the section end points;
Step 57: terminate this oam cell and handling accordingly of this section/end points.
Step 58: this section/end points subtracts 1 with the value of the reserved field in this oam cell, and execution in step 54.
Through said process as can be seen, among the present invention, adopted the mode of oam cell being carried out differentiated treatment in OAM management domain starting point and management domain end point, make described oam cell can cross over middle OAM management domain well, and accurately received by corresponding section/end points, handle accordingly.
To be described further method of the present invention in conjunction with the accompanying drawings respectively below.
As shown in Figure 6, node C among the figure and node E are the starting point and the end point of management domain, and node G is an end points; When under the intermediate point during slotting ais cell, the reserved field value is set to 0, and transmits rearward; When OAM management domain starting point C captures this oam cell, then described reserved field value is added 1 handle after, continue to insert down to handle; When the end point E of OAM management domain captures described ais cell, then the reserved field value is subtracted 1 after, continue to transmit; After end points G receives described ais cell, and know that the reserved field value of ais cell is 0, this oam cell that then terminates reports ais alarm; Therefore, among the present invention, by changing the reserved field flag bit of this 6bit, can realize that just oam cell passes through middle complete management domain, thereby realize that OAM management domain interlayer is nested.
If it is disconnected fine before the management domain starting point, then as shown in Figure 7, at first, the oam cell of inserting under management domain starting point C (being ais cell) is changed to 1 with back reserved field value automatically, because should belonging to the management domain of higher level, handles this ais cell, when its passes through the end point of this management domain, described reserved field value will be subtracted 1 automatically, thereby become common oam cell like this; Like this, after end points G receives described ais cell, and know that the reserved field value of ais cell is 0, this oam cell that then terminates reports ais alarm.
Among the present invention,, then need the reserved field value of described oam cell to be set to 0 if under common intermediate point or management domain end point, insert oam cell.As shown in Figure 8, disconnected fibre takes place before the intermediate node D, following slotting ais cell, and the reserved field value is set to 0; Like this, the end point E of corresponding OAM management domain can report ais alarm according to reserved field value this ais cell that terminates, and makes node corresponding to terminate accurately to need the oam cell of handling.
Among the present invention, for end type management territory destination node, all oam cells that then terminates, and need not to judge whether its reserved field value is 0, as shown in Figure 9.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (7)
1. a method that realizes range managing OAM information element is characterized in that, comprising:
The starting point and the endpoint information of the OAM management domain of process discerned and write down to the Operation and Maintenance oam cell in transport process;
When described oam cell through section or end points, and when determining that according to the information of record described oam cell does not pass through the starting point of OAM management domain of this section or end points correspondence, this section or end points this oam cell that terminates then; If when determining described oam cell through the starting point of the OAM management domain of this section or end points correspondence according to the information of record, this section or end points this oam cell that do not terminate.
2. the method for realization range managing OAM information element according to claim 1 is characterized in that, this method comprises:
At oam cell in transport process, the starting point of OAM management domain of record process and the quantity information of endpoint information;
Section or end points determine that according to the quantity information of the starting point of the OAM management domain of the process of oam cell record and end point it is whether through the starting point of the corresponding OAM management domain of this section or end.
3. the method for realization range managing OAM information element according to claim 1 is characterized in that, this method comprises:
The management domain attribute field is set in oam cell, and initial value is 0, and the node of slotting oam cell is the starting point of OAM management domain instantly, and then the initial value of management domain attribute field is set to 1;
When oam cell through section or during end points, judge whether described section or end points are the starting point of OAM management domain, if, then described attribute field is added 1, and continues transmission, otherwise,
Whether the value of judging the attribute field in the described oam cell according to the value of described attribute field is 0, if, then determine the starting point that this oam cell does not pass through the OAM management domain of this section or end points correspondence, and by this section or end points this oam cell that terminates, otherwise, described banner word segment value is subtracted 1, and continue to transmit.
4. the method for realization range managing OAM information element according to claim 3 is characterized in that, described management domain attribute field is:
Reserved field in the oam cell.
5. the method for realization range managing OAM information element according to claim 3 is characterized in that, this method also comprises:
When oam cell process end type OAM management domain destination node, the oam cell that then direct termination is received.
6. the method for realization range managing OAM information element according to claim 1 and 2 is characterized in that, before the step of the starting point of carrying out the OAM management domain of discerning and write down process and endpoint information, this method also comprises:
The starting point and the end point flag information of each OAM management domain are set, determine according to described flag information whether each section or end points are the starting point or the end point of OAM management domain.
7. the method for realization range managing OAM information element according to claim 6 is characterized in that, describedly the starting point of each OAM management domain is set and the step of end point flag information also comprises:
The flag information of the starting point and the end point of embedded OAM management domain only is set.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100534813A CN100414881C (en) | 2005-03-11 | 2005-03-11 | Method for implementing range managing OAM information element |
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| CNB2005100534813A CN100414881C (en) | 2005-03-11 | 2005-03-11 | Method for implementing range managing OAM information element |
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| CN1832418A CN1832418A (en) | 2006-09-13 |
| CN100414881C true CN100414881C (en) | 2008-08-27 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0827306A2 (en) * | 1996-07-05 | 1998-03-04 | General DataComm, Inc. | Method and apparatus for generating a proxy connection endpoint for operation administration and management (OAM) asynchronous transfer mode (ATM) cells |
| US20010038471A1 (en) * | 2000-03-03 | 2001-11-08 | Niraj Agrawal | Fault communication for network distributed restoration |
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- 2005-03-11 CN CNB2005100534813A patent/CN100414881C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0827306A2 (en) * | 1996-07-05 | 1998-03-04 | General DataComm, Inc. | Method and apparatus for generating a proxy connection endpoint for operation administration and management (OAM) asynchronous transfer mode (ATM) cells |
| US20010038471A1 (en) * | 2000-03-03 | 2001-11-08 | Niraj Agrawal | Fault communication for network distributed restoration |
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| CN1832418A (en) | 2006-09-13 |
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