CN1719825A - Method and network for implementing link protection change - Google Patents
Method and network for implementing link protection change Download PDFInfo
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- CN1719825A CN1719825A CN200410062345.6A CN200410062345A CN1719825A CN 1719825 A CN1719825 A CN 1719825A CN 200410062345 A CN200410062345 A CN 200410062345A CN 1719825 A CN1719825 A CN 1719825A
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Abstract
This invention discloses a network for realizing link protection conversion containing a communication link composed of a working link, a protection link and working link data flow end junctions at both ends of the working link and protection link data flow end junctions at both ends of the protection link, among which, said communication link includes an ATM exchange unit at the either end, each ATM includes a working link logic node and a protection link logic node. This invention also discloses a realization method including: when the working link is fault, the ATM cross connection between the fault working link data flow end junction and the working link logic node is deleted and the ATM cross connection is set up between the fault working link data flow end junction and the protection link logic node.
Description
Technical field
The present invention relates to transmit resist technology, particularly relate to a kind of method and network of realizing link protection change.
Background technology
ATM(Asynchronous Transfer Mode) protection (APS) mechanism of switching is a kind of atm link layer protection mechanism, is applied to not have the situation of physical layer protection mechanism especially, does not just have the situation of physical link protection.Utilize APS mechanism, network can be switched to business data flow on another paths after detecting a paths fault automatically.The specific implementation of APS mechanism can adopt 1:1,1+1, or 1:N protected mode.Wherein, the 1:1 protected mode is for every active link is provided with a protection link, and is exactly concrete: the protection link that a special use is all arranged for every active link; Active link just often, by the active link bearer service; When active link breaks down, by protection link bearer business.The 1+1 protection pattern is meant that protected business data flow transmits simultaneously with active link and protection link, if wherein any link is cut off, then by another link bearer data for every active link is provided with a protection link.The 1:N protected mode is meant N bar active link is provided with a protection link; when wherein an active link breaks down; business datum is switched on the protection link, if but have many active links to break down simultaneously, then can only protect a highest active link of its medium priority.
The following describes the mechanism of existing techniques in realizing 1:1 APS protected mode.Usually, whether system's monitoring link always is normal with the protection link, and at active link just often, business datum is carried on the active link.When system monitoring breaks down and protects link just often to active link, system can carry out APS automatically and switch.Usually, link failure is meant transmission fault, such as, A-D shown in Figure 1 or the link transmission fault between the E-H.
Fig. 1 switches preceding link structure schematic diagram for prior art 1:1 APS, and Fig. 2 is the link structure schematic diagram after prior art 1:1 APS switches.Wherein, in the network of existing techniques in realizing link protection change, communication link is made of active link and protection link, communication link one end has active link data flow destination node A and protection link data stream destination node E, and the communication link other end has active link data flow destination node D and protection link data stream destination node H; Active link data flow destination node A, D link to each other by active link, and protection link data stream destination node E, H link to each other by the protection link.The data flow destination node is a kind of ATM logic entity, such as, can be that ATM is cut apart and (SAR) logic entity of recombinating.In general, there is not annexation between data flow destination node A and the E, do not carry out information interaction, do not have annexation between data flow destination node D and the H, do not carry out information interaction.The Virtual Path Identifier (VPI) and the virtual path identifiers (VCI) of the ATM cell of process active link data flow destination node A are respectively VPI_W1 and VCI_W1; the VPI and the VCI of the ATM cell of process active link data flow destination node D are respectively VPI_W2 and VCI_W2; the VPI and the VCI that flow the ATM cell of destination node E through the overprotection link data are respectively VPI_P1 and VCI_P1, and the VPI and the VCI that flow the ATM cell of destination node H through the overprotection link data are respectively VPI_P2 and VCI_P2.Here, active link and protection link all are two-way.Upper layer application is meant that ATM holds the business of sanction.
As shown in Figure 1, when active link just often, the business datum of upper layer application is carried on the active link A-D.When active link breaks down; if the protection link is normal; then carrying out APS switches; promptly disconnect the logic connecting relation of upper layer application to active link A-D; set up the logic connecting relation of upper layer application, and then business data flow is switched on the protection link E-H from active link A-D to protection link E-H.Wherein, APS switches to be controlled by a link monitoring process and finishes.The state of real-time monitoring link of link monitoring process and protection link when active link breaks down and protects the link fault-free, is finished APS by the control of link monitoring process and is switched.As shown in Figure 2, finish after APS switches, the business datum of upper layer application is carried on the protection link E-H.Because the data flow destination node becomes E and H by A and D, therefore, the Route Distinguisher VPI and the VCI of the atm link of carrying upper layer application business datum become VPI_P, VCI_P by VPI_W, VCI_W.
This shows that it is not transparent that prior art APS switches upper layer application, the business datum of upper layer application needs explicit switching on the protection link from active link, and needs upper layer application to carry out certain adaptive and processing.That is to say that upper layer application need receive and the processing cell by new atm link, atm cell stream is adapted for business data flow, thereby has increased extra expense.In addition, because upper layer application need be carried out adaptation processing, this just causes the coupling of ATM layer and upper layer application too strong, and promptly the ATM layer is related with upper layer application too many, and system level is unintelligible, is unfavorable for system maintenance.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method that realizes link protection change, switches details so that it can shield APS to upper layer application, and makes upper layer application need not to carry out the switching that adaptation processing just can realize business data flow.
Another object of the present invention is to provide a kind of network of realizing link protection change, switch details, and make upper layer application need not to carry out the switching that adaptation processing just can realize business data flow so that it can shield APS to upper layer application.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses a kind of method that realizes link protection change, respectively set up an atm switching element at the communication link two ends, wherein, each atm switching element comprises active link logical node and protection link logical node, set up the ATM interconnection between the active link logical node of active link data flow destination node and atm switching element respectively at every end of communication link, and the ATM interconnection between the protection link logical node of protection link data stream destination node and atm switching element;
Whether the judgment task link is normal, if, then do not carry out APS and switch, switch step otherwise carry out following APS:
Delete the ATM interconnection between the active link logical node of fail operation link data stream destination node and atm switching element at every end of communication link respectively, set up the ATM interconnection between the protection link logical node that the fail operation link data flows destination node and atm switching element.
Described execution APS switches step and also comprises: the ATM interconnection between the protection link logical node of each end deletion protection link data stream destination node of communication link and atm switching element, set up the ATM interconnection between the fail operation link logical node that the protection link data flows destination node and atm switching element.
Comprise one or more active link in the communication link, each atm switching element comprises the active link logical node identical with working chain travel permit number, and then this method further comprises: set up ATM interconnection one to one between all working link data stream destination node and the active link logical node respectively at every end of communication link;
If one or more active link breaks down simultaneously, then following steps are carried out at the communication link two ends respectively:
ATM interconnection between the fail operation link data stream destination node that deletion priority is the highest and the active link logical node of atm switching element, the ATM interconnection of setting up the protection link logical node of the highest fail operation link data stream destination node of priority and atm switching element.
Corresponding; described execution APS switches step and also comprises: the ATM interconnection between the protection link logical node of each end deletion protection link data stream destination node of communication link and atm switching element, set up the ATM interconnection between the fail operation link logical node that the highest fail operation link data of protection link data stream destination node and priority flows the corresponding atm switching element of destination node.
In the such scheme, the whether normal method of described judgment task link can for: whether the ATM OAM CC function by active link data flow destination node comes the testing link normal.
In addition, before the described APS of execution switched step, this method also comprised:
Judge whether the protection link is normal, if, then end protection link data stream destination node is initiated the APS switching request by protection chain road direction other end protection link data stream destination node, after other end protection link data stream destination node is received the APS switching request, carries out described APS again and switches step; Otherwise report and alarm, process ends.
Wherein, described judgement protection link whether normal method can for: whether the ATM OAM CC function by protection link data stream destination node detects the protection link normal.
The invention also discloses a kind of network of realizing link protection change, comprise the communication link that constitutes by active link and protection link, and be positioned at the active link data flow destination node at active link two ends and be positioned at the protection link data stream destination node of protecting both link ends;
Communication link two ends in this network comprise an atm switching element respectively, and each atm switching element comprises and is used for setting up cross-coupled active link logical node of ATM and protection link logical node with active link data flow destination node and protection link data stream destination node;
Active link just often, the active link logical node of atm switching element links to each other with the active link data flow destination node of this end, the protection link logical node of atm switching element and the protection link data of this end stream destination node links to each other;
Active link fault and protection link just often, the protection link logical node of atm switching element links to each other with the active link data flow destination node of this end, the active link logical node of atm switching element and the protection link data of this end flow destination node and link to each other.
Further comprise one or more active link in the described communication link, then each atm switching element comprises the active link logical node identical with working chain travel permit number, and each active link logical node links to each other with an active link data flow destination node respectively when active link is normal;
One or more active link breaks down simultaneously and protects link just often; the fail operation link data stream destination node that the protection link logical node of atm switching element and the priority of this end are the highest links to each other, and the active link logical node of the atm switching element of the fail operation link data stream destination node correspondence that priority is the highest flows destination node with the protection link data of this end and links to each other.
Wherein, described atm switching element can be arranged on the two ends of active link or the two ends of protection link.
By such scheme as can be seen, key of the present invention is: increase an atm switching element respectively newly at the communication link two ends of network, each atm switching element comprises and is used to set up cross-coupled active link logical node of ATM and protection link logical node.Like this; when active link breaks down; ATM interconnection between the active link logical node of deletion fail operation link data stream destination node and each atm switching element; set up the ATM interconnection between the protection link logical node of fail operation link data stream destination node and each atm switching element, realization APS switches.
Therefore; the network of this realization link protection change provided by the present invention and method; can shield APS to upper layer application and switch details, and make upper layer application need not to carry out adaptation processing just can to realize the switching of business data flow, and then increase the definition and the extensibility of network layer.
Description of drawings
Fig. 1 switches preceding link structure schematic diagram for prior art 1:1 APS;
Fig. 2 is the link structure schematic diagram after prior art 1:1 APS switches;
Fig. 3 switches preceding link structure schematic diagram for 1:1 APS of the present invention;
Fig. 4 is the link structure schematic diagram after 1:1 APS of the present invention switches;
Fig. 5 is the realization flow figure of 1:1 APS reverse method of the present invention.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
Among the present invention; for the APS that realizes atm link switches; increase an atm switching element (SWITCH) respectively newly at the communication link two ends of network, each atm switching element comprises and is used for setting up cross-coupled active link logical node of ATM and protection link logical node with active link data flow destination node and protection link data stream destination node.Atm switching element can be arranged on the two ends of active link, also can be arranged on the two ends of protection link, and no matter which bar link atm switching element is arranged on, active link and all shared these two atm switching elements of protection link.Active link just often, the active link logical node of the atm switching element of every end links to each other with the active link data flow destination node of this end; The protection link logical node of the atm switching element of every end links to each other with the protection link data of this end stream destination node; The active link fault and the protection link just often, the protection link logical node of the atm switching element of every end links to each other with the active link data flow destination node of this end; The active link logical node of the atm switching element of every end links to each other with the protection link data of this end stream destination node.
Based on above-mentioned network; when active link breaks down; ATM interconnection between the active link logical node of deletion communication link one end fail operation link data stream destination node and this end atm switching element; set up the ATM interconnection between the protection link logical node of communication link one end fail operation link data stream destination node and this end atm switching element, realization APS switches.
Atm switching element can use commercial ATM chip to realize.It is exactly to realize the ATM function of exchange by Route Distinguisher VPI and the VCI that changes ATM cell at all.That is to say that atm switching element is used to set up the ATM interconnection, finish the exchange that the ATM cell leader is known VPI and VCI.Such as, by setting up the ATM interconnection, the knowledge of ATM cell leader is become VPI2, VCI2 from VPI1, VCI1.
Fig. 3 switches preceding link structure schematic diagram for 1:1 APS of the present invention, and wherein, atm switching element SWITCH1 links to each other with the end of active link with the protection link, and atm switching element SWITCH2 links to each other with the other end of active link with the protection link.Logical node B, C, F and G automatically increase along with the increase of atm switching element, be used for and the data flow destination node between set up the ATM interconnection.As shown in Figure 3; active link just often; the active link logical node B of atm switching element SWITCH1 links to each other with active link data flow destination node A; the active link logical node C of atm switching element SWITCH2 links to each other with active link data flow destination node D; the protection link logical node F of atm switching element SWITCH1 links to each other with protection link data stream destination node E, and the protection link logical node G of atm switching element SWITCH2 links to each other with protection link data stream destination node H.
Fig. 4 is the link structure schematic diagram of 1:1 APS of the present invention after switching, and has shown when the active link fault and has protected link just often, the link structure after finishing APS and switching.Wherein, the protection link logical node F of atm switching element SWITCH1 links to each other with active link data flow destination node A, and the protection link logical node G of atm switching element SWITCH2 links to each other with active link data flow destination node D; The active link logical node B of atm switching element SWITCH1 links to each other with protection link data stream destination node E, and the active link logical node C of atm switching element SWITCH2 links to each other with protection link data stream destination node H.Being connected between above-mentioned logical node and the data flow destination node is the ATM interconnection.
As shown in Figure 3, when active link just often, business datum is carried on the active link A-B-C-D.Wherein, A and B, C and D, E and F are the ATM interconnection between G and the H.When system detects active link and breaks down, if the protection link is normal, then delete A and B, C and D, E and F, A and F are set up in the ATM interconnection between G and the H, G and D, E and B, the ATM interconnection between C and the H.As shown in Figure 4, after finishing APS and switching, business datum is carried on the protection link A-F-G-D.If there is fault in the protection link, even active link is undesired, does not trigger APS yet and switch, just report and alarm.
Based on above-mentioned network, as shown in Figure 5, the present invention realizes that the method for link protection change may further comprise the steps:
Whether step 503, judgment task link be normal, if then return step 502; Otherwise execution in step 504～506.
Wherein, no matter be active link or protection link, whether can check (CC, continuous check) function to detect link continuously by the ATM operation and maintenance cell (OAM) of data flow destination node normal.What operation and maintenance cell (OAM) was gone up carrying is the information of link operation and maintenance, such as fault, information such as alarm, oam cell is 48 byte information fields of the frequent timed sending of ATM entity, its content provides in advance, receive the switch of these cells, judge line quality, such as whether fault warning etc. is arranged according to these cell error codes.In the present embodiment, can come the testing link whether normal by the ATM OAM CC of active link data flow destination node A.
Whether step 504～506, judgement protect link normal, if, then protect link data stream destination node E to protect link data to flow destination node H and initiate the APS switching request by protection chain road direction, execution in step 507～509 then; Otherwise report and alarm, process ends.
Whether similarly, can detect the protection link by the ATM OAM CC function of protection link data stream destination node E normal.
Wherein, can initiate the APS switching request by link monitoring process notice protection link data stream destination node E.The cross-coupled deletion of ATM only needs deletion to carry out atm switching element port, VPI and the VCI of the logical node side of ATM exchange, and the atm switching element port, VPI and the VCI that keep the data flow destination node side of carrying out the ATM exchange get final product.
At this moment, though current link E-B-C-H is cisco unity malfunction owing to the link transmission fault between B and the C, but must set up the ATM interconnection between E and B and C and the H, because if removed the link transmission fault between B and the C, link E-B-C-H just can operate as normal, but also can prepare for next APS switches.
Illustrate for a specific example that below the present invention is by setting up and delete the method that the ATM interconnection realizes that the atm link protection is switched.
Table 1 shows the port corresponding relation of node A～H and atm switching element, and knows through the ATM cell leader before and after the atm switching element.As shown in table 1, the port of atm switching element SWITCH1 is respectively 1,2,5 and 6, the port of atm switching element SWITCH2 is respectively 3,4,7 and 8, data flow destination node A, D, E and H link to each other with 8 with port one, 4,5 respectively, and logical node B, C, F and G link to each other with 7 with port 2,3,6 respectively.
| Node | (PORT，VPI，VCI) |
| A | (1，5，36) |
| B | (2，6，38) |
| C | (3，6，38) |
| D | (4，8，33) |
| E | (5，1，30) |
| F | (6，9，39) |
| G | (7，9，39) |
| H | (8，7，35) |
Table 1
The method according to this invention, active link are just often set up A and B in advance, C and D, and E and F, the ATM interconnection between G and the H, business datum is carried on the active link A-B-C-D.Like this, the Route Distinguisher of sending from active link data flow destination node A is VPI=5, and the atm cell stream of VCI=36 enters atm switching element SWITCH1 from port one, and atm switching element SWITCH1 is forwarded to port 2 with it.When ATM cell when port 2 leaves atm switching element SWITCH1, when just ATM cell was through active link logical node B, the ATM cell leader was known and is become VPI=6, VCI=38.Atm cell stream arrives active link logical node C by active link, through active link logical node C, Route Distinguisher is VPI=6, and the atm cell stream of VCI=38 enters atm switching element SWITCH2 from port 3, and atm switching element SWITCH2 is forwarded to port 4 with it.When ATM cell is left atm switching element SWITCH2 arrival active link data flow destination node D from port 4 after, the knowledge becoming of ATM cell leader VPI=8, VCI=33.
When active link breaks down, need carry out APS and switch.At this moment, at first delete A and B, E and F, C and D, A and F are set up in the ATM interconnection between G and the H then, E and B, C and H, the ATM interconnection between G and the D, business datum is carried on the protection link A-F-G-D.Like this, the Route Distinguisher of sending from active link data flow destination node A is VPI=5, and the atm cell stream of VCI=36 enters atm switching element SWITCH1 from port one, and atm switching element SWITCH1 is forwarded to port 6 with it.When ATM cell when port 6 leaves atm switching element SWITCH1, just ATM cell is when overprotection link logical node F, the ATM cell leader is known and is become VPI=9, VCI=39.Atm cell stream arrives protection link logical node G by the protection link; through overprotection link logical node G; Route Distinguisher is VPI=9, and the atm cell stream of VCI=39 enters atm switching element SWITCH2 from port 7, and atm switching element SWITCH2 is forwarded to port 4 with it.When ATM cell is left atm switching element SWITCH2 arrival active link data destination node D from port 4 after, the knowledge becoming of ATM cell leader VPI=8, VCI=33.
From such scheme as can be seen, the realization principle of the inventive method and the operation principle of double-point double-throw switch are similarly, at first disconnect the ATM interconnection in two Geju City, set up two new ATM interconnections again, realize active link and protect switching of link.In realization, be that ATM cell distributes new unique Route Distinguisher VPI and VCI to set up new atm link by the logical node that is positioned at atm link inside.Like this, before and after the APS of atm link switched, upper layer application still kept itself and the logic connecting relation of active link A-D, thereby the Route Distinguisher that carries the atm link of upper layer application business datum remains unchanged, upper layer application need not to carry out adaptive and handles, and has guaranteed the level and smooth of business.And the inventive method has shielded the bottom layer realization details, and is transparent fully to upper layer application.
The present invention also can be used for the 1:N protected mode; its operation principle and 1:1 protected mode are similar; difference is that the 1:N protected mode is that N bar active link is provided with a protection link, and each atm switching element in the network of realization link protection change comprises the active link logical node identical with working chain travel permit number.When each active link just often, the active link data flow destination node of the active link logical node of the atm switching element of every end and this end is corresponding to link to each other; The protection link logical node of the atm switching element of every end and corresponding linking to each other of the protection link data of this end stream destination node; When one of them active link fault and protection link just often, the fail operation link logical node of the atm switching element of every end and the protection link data of this end stream destination node links to each other; The protection link logical node of the atm switching element of every end links to each other with the fail operation link data of this end stream destination node; When a plurality of active link faults and protection link just often, the active link logical node of the atm switching element of the highest fail operation link data of the priority of every end stream destination node correspondence links to each other with the protection link data stream destination node of this end; The fail operation link data stream destination node that the protection link logical node of the atm switching element of every end and the priority of this end are the highest links to each other.Wherein, the fail operation link data stream destination node that priority is the highest is meant the highest pairing active link data flow of that active link destination node of active link medium priority that breaks down.Like this, when having only an active link to break down, business datum is switched on the protection link, when having many active links to break down simultaneously, then has only the business datum on the highest active link of priority to be switched on the protection link.
In a word, the above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, a kind of network of realizing link protection change comprises the communication link that is made of active link and protection link, and is positioned at the active link data flow destination node at active link two ends and is positioned at the protection link data stream destination node of protecting both link ends;
It is characterized in that, communication link two ends in this network comprise an atm switching element respectively, and each atm switching element comprises and is used for setting up cross-coupled active link logical node of ATM and protection link logical node with active link data flow destination node and protection link data stream destination node;
Active link just often, the active link logical node of atm switching element links to each other with the active link data flow destination node of this end, the protection link logical node of atm switching element and the protection link data of this end stream destination node links to each other;
Active link fault and protection link just often, the protection link logical node of atm switching element links to each other with the active link data flow destination node of this end, the active link logical node of atm switching element and the protection link data of this end flow destination node and link to each other.
2, network according to claim 1, it is characterized in that, further comprise one or more active link in the described communication link, then each atm switching element comprises the active link logical node identical with working chain travel permit number, and each active link logical node links to each other with an active link data flow destination node respectively when active link is normal;
One or more active link breaks down simultaneously and protects link just often; the fail operation link data stream destination node that the protection link logical node of atm switching element and the priority of this end are the highest links to each other, and the active link logical node of the atm switching element of the fail operation link data stream destination node correspondence that priority is the highest flows destination node with the protection link data of this end and links to each other.
3, network according to claim 1 and 2 is characterized in that, described atm switching element is arranged on the two ends of active link or the two ends of protection link.
4, a kind of method that realizes link protection change is characterized in that,
Respectively set up an atm switching element at the communication link two ends, wherein, each atm switching element comprises active link logical node and protection link logical node, set up the ATM interconnection between the active link logical node of active link data flow destination node and atm switching element respectively at every end of communication link, and the ATM interconnection between the protection link logical node of protection link data stream destination node and atm switching element;
Whether the judgment task link is normal, if, then do not carry out APS and switch, switch step otherwise carry out following APS:
Delete the ATM interconnection between the active link logical node of fail operation link data stream destination node and atm switching element at every end of communication link respectively, set up the ATM interconnection between the protection link logical node that the fail operation link data flows destination node and atm switching element.
5, method according to claim 4; it is characterized in that; described execution APS switches step and also comprises: the ATM interconnection between the protection link logical node of each end deletion protection link data stream destination node of communication link and atm switching element, set up the ATM interconnection between the fail operation link logical node that the protection link data flows destination node and atm switching element.
6, method according to claim 4, it is characterized in that, comprise one or more active link in the communication link, each atm switching element comprises the active link logical node identical with working chain travel permit number, and then this method further comprises: set up ATM interconnection one to one between all working link data stream destination node and the active link logical node respectively at every end of communication link;
If one or more active link breaks down simultaneously, then following steps are carried out at the communication link two ends respectively:
ATM interconnection between the fail operation link data stream destination node that deletion priority is the highest and the active link logical node of atm switching element, the ATM interconnection of setting up the protection link logical node of the highest fail operation link data stream destination node of priority and atm switching element.
7, method according to claim 6; it is characterized in that; described execution APS switches step and also comprises: the ATM interconnection between the protection link logical node of each end deletion protection link data stream destination node of communication link and atm switching element, set up the ATM interconnection between the fail operation link logical node that the highest fail operation link data of protection link data stream destination node and priority flows the corresponding atm switching element of destination node.
8, method according to claim 4 is characterized in that, whether normal method is described judgment task link: whether the ATM OAM CC function by active link data flow destination node comes the testing link normal.
According to claim 4 or 6 described methods, it is characterized in that 9, before the described APS of execution switched step, this method also comprised:
Judge whether the protection link is normal, if, then end protection link data stream destination node is initiated the APS switching request by protection chain road direction other end protection link data stream destination node, after other end protection link data stream destination node is received the APS switching request, carries out described APS again and switches step; Otherwise report and alarm, process ends.
10, whether method according to claim 9, whether normal method is described judgement protection link: it is normal to detect the protection link by the ATM OAM CC function of protecting link data stream destination node if is characterized in that.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2007140683A1 (en) * | 2006-06-05 | 2007-12-13 | Huawei Technologies Co., Ltd. | Service protecting method, system and device based on connectionless |
| CN102123057A (en) * | 2010-12-09 | 2011-07-13 | 中国电力科学研究院 | Synchronous network route detection, optimization and network routing method and synchronous network system |
| CN112532532A (en) * | 2020-11-16 | 2021-03-19 | 烽火通信科技股份有限公司 | Service returning method, device, equipment and readable storage medium |
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2004
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007140683A1 (en) * | 2006-06-05 | 2007-12-13 | Huawei Technologies Co., Ltd. | Service protecting method, system and device based on connectionless |
| US7848225B2 (en) | 2006-06-05 | 2010-12-07 | Huawei Technologies Co., Ltd. | Service protecting switching method, system and device in a connectionless network |
| CN101051995B (en) * | 2006-06-05 | 2012-07-04 | 华为技术有限公司 | Protection switching method based on no connection network |
| CN102123057A (en) * | 2010-12-09 | 2011-07-13 | 中国电力科学研究院 | Synchronous network route detection, optimization and network routing method and synchronous network system |
| CN102123057B (en) * | 2010-12-09 | 2014-09-03 | 中国电力科学研究院 | Synchronous network route detection, optimization and network routing method and synchronous network system |
| CN112532532A (en) * | 2020-11-16 | 2021-03-19 | 烽火通信科技股份有限公司 | Service returning method, device, equipment and readable storage medium |
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|---|---|
| CN100499640C (en) | 2009-06-10 |
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