CN105681149A - Loop network protection method and device - Google Patents
Loop network protection method and device Download PDFInfo
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- CN105681149A CN105681149A CN201511019128.3A CN201511019128A CN105681149A CN 105681149 A CN105681149 A CN 105681149A CN 201511019128 A CN201511019128 A CN 201511019128A CN 105681149 A CN105681149 A CN 105681149A
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- node
- service aisle
- protection
- transmission
- business
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
- H04L12/437—Ring fault isolation or reconfiguration
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0668—Management of faults, events, alarms or notifications using network fault recovery by dynamic selection of recovery network elements, e.g. replacement by the most appropriate element after failure
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention discloses a loop network protection method and device. The method comprises the steps of presetting a protection channel; when detecting a fault, converting business transmission from a working channel into the reverse preset protection channel, so as to transmit business to a lower loop node through the protection channel and eliminate a loop. By adopting the loop network protection method and device provided by the technical scheme of the invention, the generation of the loop in the case of simultaneous faults of a clockwise direction path and a counterclockwise direction path from an upper loop node to the lower loop node is avoided, and the congestion of data transmission is avoided.
Description
Technical field
The present invention relates to communication technology, espespecially ring net protection method and device.
Background technology
In order to improve the cost of the reliability of network, isolated fault, minimizing maintenance equipment, Packet Transport Network (PTN, PacketTransportNetwork) equipment needs to realize data transmission in looped network mode. Wherein, the application of the multiprotocol label switching in Ring network technologies (MPLS-TP, MultiprotocolLabelSwitching-TransportProfile) technology is relatively broad. MPLS-TP technology realizes the pattern of looped network protection and includes loopback (Wrapping) pattern.
In Wrapping pattern, looped network protection includes service aisle and protection passage, and wherein, service aisle includes service aisle clockwise and service aisle counterclockwise; Protection passage includes protecting passage counterclockwise and protecting passage clockwise. Service aisle clockwise and counterclockwise protection passage form a looped network protection group, and service aisle counterclockwise and clockwise protection passage form a looped network protection group, are realized the load balancing of business transmission by two looped network protection groups.
Showing example with Fig. 1, node A, node B, node C, node D, node E, node F form a looped network. With node C for lower link point, then service aisle is clockwise: D-> E-> F-> A-> B-> C, and protection passage is counterclockwise: C-> B-> A-> F-> E-> D-> C; Service aisle counterclockwise is: B-> A-> F-> E-> D-> C, and protection passage is clockwise: C-> D-> E-> F-> A-> B-> C. Visible, protection passage and protection passage counterclockwise are all rings closed clockwise.
Under normal circumstances, business is transferred to lower link point by service aisle clockwise or service aisle counterclockwise by upper link point. Specifically, business packed has tunnel (Tunnel) label for indicating lower link point and for indicating the ring label of the next node transmitting path on ring. Upper link point based on Tunnel label and ring label by downward for business ring node-node transmission. For Fig. 1, if business is by ring on node F, arriving lower link point C by service aisle counterclockwise, namely transmission path is F-> E-> D-> C (heavy line referring in Fig. 1).
When there is link failure, the business on service aisle is switched on reverse protection passage by the node broken down, and, is come by corresponding protection channel switching to reverse service aisle meanwhile. Specifically, when the clockwise link of node on the ring breaks down, being then switched to by service aisle clockwise and protect passage counterclockwise, clockwise protection channel switching is to service aisle counterclockwise; When the anticlockwise link of node on the ring breaks down, being then switched to by service aisle counterclockwise and protect passage clockwise, counterclockwise protection channel switching is to service aisle clockwise. When business is transferred in looped network another node place broken down, then switch the business on reverse service aisle, until being transferred to lower link point. Visible, Wrapping pattern realizes the business flow at fault place reversely based on the coordination of the adjacent node of fault both sides, thus completing pretection switch.
For Fig. 2, business is by ring on node F, and ring under lower link point C, the link between node E and node D breaks down. Business on service aisle counterclockwise is switched to and protects on passage clockwise by the node E broken down; and it is transferred to node D always; D detects link failure; switch the business on service aisle counterclockwise; until being transferred to lower link point C, namely transmission path is F-> E-> F-> A-> B-> C-> D-> C.
But; when all breaking down in the clockwise path of upper link point to lower link point and anticlockwise path; owing to the business on service aisle is switched on reverse protection passage; simultaneously; when business is transferred in looped network another node broken down; switch the business on reverse service aisle again, then occurred as soon as loop.
For Fig. 3, business is by ring on node F, and ring under lower link point C, the link between node E and node D breaks down, and the link between node A and node B also breaks down. Business, from ring node F, is transferred to E point through service aisle counterclockwise, owing to E point detects counterclockwise fault, therefore business is switched to by service aisle counterclockwise and protects on passage clockwise, and along protecting passage that business is transferred to node A clockwise; Owing to node A detects clockwise fault equally, therefore again by business by protecting channel switching to service aisle counterclockwise clockwise, and be transferred to again node E along service aisle counterclockwise. So, this business forms loop between node A, F, E. If now, upper link point F constantly has business to input, then can cause data transmission blocking.
Summary of the invention
In order to solve above-mentioned technical problem, the invention provides ring net protection method and device, it is possible to cancellation loop also avoids data transmission blocking.
First aspect, the embodiment of the present invention provides a kind of ring net protection method, including: pre-set protection passage; When link failure being detected, business transmission is switched to the reverse protection passage pre-set by service aisle, to utilize described protection passage to make business be transferred to lower link point lower ring.
Further, the protection passage pre-set described in terminates in lower link point.
Further, described business transmission is switched to the reverse protection passage pre-set by service aisle, specifically includes: utilize ring label that by service aisle, the transmission of described business is switched to the reverse protection passage pre-set.
Further, described business transmission is switched to the reverse protection passage pre-set by service aisle after, also include: when described link failure recovery being detected, enter Wait-to-Restore WTR state, and judge whether Preset Time arrives; If Preset Time does not arrive, then the described reverse protection passage pre-set is utilized to make business be transferred to lower link point; If Preset Time arrives, then utilize described service aisle that business is transferred to lower link point.
Further, intervalometer is utilized to judge whether described Preset Time arrives.
Second aspect, the embodiment of the present invention provides a kind of looped network protection device, including: unit and switch unit are set, wherein: described arrange unit, are used for pre-setting protection passage; Described switch unit, for when fault being detected, is switched to business transmission by service aisle and reverse described arranges the protection passage that unit pre-sets, to utilize described protection passage to make business be transferred to lower link point time ring.
Further, the described unit that arranges is specifically for pre-setting the protection passage terminating in lower link point.
Further, described switch unit specifically for: utilize ring label by business transmission be switched to the reverse protection passage pre-set by service aisle.
Further, described switch unit specifically for: described business transmission is switched to the reverse protection passage pre-set by service aisle after, if link failure recovery being detected, then enter Wait-to-Restore WTR state, and judge whether Preset Time arrives; If Preset Time does not arrive, then the described reverse protection passage pre-set is utilized to make business be transferred to lower link point; If Preset Time arrives, then utilize described service aisle that business is transferred to lower link point.
Further, described switch unit specifically for: utilize intervalometer to judge whether Preset Time arrives.
The third aspect, the embodiment of the present invention provides a kind of ring net protection method, is applied to any node in looped network, including: described node receives the business datum of transmission in looped network; If described node detect described business datum be on that transmitted by service aisle on first direction in described looped network and described service aisle be positioned at described node after transmission link break down, then the protection passage that described business datum is switched in second direction opposite to the first direction in described looped network by described service aisle is transmitted; If described node detect described business datum be by the protection channel transfer in second direction described in described looped network and described protection passage be positioned at described node after transmission link break down, then terminate the transmission of described business datum.
Further, described protection passage terminates in lower link point.
Further, described nodal test go out on described service aisle be positioned at described node after transmission link break down, specifically include: the transmission link that described nodal test goes out between next node adjacent with described node on described service aisle and described node breaks down; Described nodal test go out on described protection passage be positioned at described node after transmission link break down, specifically include: the transmission link that described nodal test goes out on described protection passage between the next node adjacent with described node and described node breaks down.
Fourth aspect, the embodiment of the present invention provides a kind of looped network protection device, is applied to any node in looped network, including: receive unit and detection unit, wherein: described reception unit, for receiving the business datum of transmission in looped network; Described detection unit, for detect the business datum that described reception unit receives be by described looped network in service aisle transmission on first direction and on described service aisle be positioned at described node after transmission link break down time, the protection passage that described business datum is switched in second direction opposite to the first direction in described looped network by described service aisle is transmitted; Detect the business datum that described reception unit receives be by the protection channel transfer in second direction described in described looped network and described protection passage be positioned at described node after transmission link break down time, terminate the transmission of described business datum.
Further, described protection passage terminates in lower link point.
Further, described detection unit specifically for: detect the business datum that described reception unit receives be by described looped network in service aisle transmission on first direction, and when on described service aisle, link between the next node adjacent with described node and described node breaks down, the protection passage that described business datum is switched in second direction opposite to the first direction in described looped network by described service aisle is transmitted; Detecting that the business datum that described reception unit receives is by the protection channel transfer in second direction described in described looped network; and when link between the next node adjacent with described node and described node breaks down on described protection passage, terminate the transmission of described business datum.
The invention provides ring net protection method and device, by pre-setting protection passage; When fault being detected; business transmission is switched to the reverse protection passage pre-set by service aisle; to utilize described protection passage to make business be transferred to lower link point lower ring; avoid the generation of loop when breaking down in the upper link point clockwise path to lower link point and anticlockwise path simultaneously, and avoid data transmission blocking.
Accompanying drawing explanation
Accompanying drawing is for providing being further appreciated by technical solution of the present invention, and constitutes a part for description, is used for explaining technical scheme, is not intended that the restriction to technical solution of the present invention together with embodiments herein.
Fig. 1 is looped network protection transmission path under normal circumstances in prior art;
Fig. 2 is the transmission path under prior art link failure condition;
Fig. 3 is the loop that in prior art, service aisle clockwise and service aisle counterclockwise produce when breaking down simultaneously;
The flow chart of a kind of ring net protection method that Fig. 4 provides for the embodiment of the present invention;
The transmission path schematic diagram of the embodiment one that Fig. 5 provides for the embodiment of the present invention;
The transmission path schematic diagram of the embodiment two that Fig. 6 provides for the embodiment of the present invention;
The structural representation of a kind of looped network protection device that Fig. 7 provides for the embodiment of the present invention;
The flow chart of the another kind of ring net protection method that Fig. 8 provides for the embodiment of the present invention;
The structural representation of the another kind of looped network protection device that Fig. 9 provides for the embodiment of the present invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with accompanying drawing, embodiments of the invention are described in detail. It should be noted that when not conflicting, the embodiment in the application and the feature in embodiment can combination in any mutually.
Can perform in the computer system of such as one group of computer executable instructions in the step shown in the flow chart of accompanying drawing. And, although illustrate logical order in flow charts, but in some cases, it is possible to perform shown or described step with the order being different from herein.
The flow chart of a kind of ring net protection method that Fig. 4 provides for the embodiment of the present invention, the key step of the method describes as follows:
Step 401: pre-set protection passage;
Wherein, protection passage includes protecting passage clockwise and protecting passage counterclockwise.
Further, the protection passage pre-set terminates in lower link point.
So, protection passage is no longer a ring closed, but the same with service aisle, terminates in lower link point.
For scene shown in Fig. 1, in detail the setting of the protection passage of the ring net protection method that the embodiment of the present invention provides is illustrated. In FIG; node A, node B, node C, node D, node E, node F form a looped network; with node C for lower link point; the ring net protection method provided according to embodiments of the present invention; creating service aisle clockwise is: D-> E-> F-> A-> B-> C; protect passage counterclockwise: B-> A-> F-> E-> D-> C, service aisle counterclockwise: B-> A-> F-> E-> D-> C, protect passage clockwise: D-> E-> F-> A-> B-> C.
Due to Wrapping looped network of the prior art, protection passage and protection passage counterclockwise are all closed loops clockwise. It is to say, when business is at clockwise protection passage and counterclockwise on protection passage, even if arriving lower link point also cannot descend ring, it is necessary to by by ring on protection channel switching to reverse service aisle and under service aisle. This step will do not protected passage clockwise and protected passage to be set to a ring closed counterclockwise; but passage will be protected clockwise and protect passage to be arranged at lower link point termination counterclockwise; business is so made can directly to descend ring when protecting link point under arrival on passage, without being switched on reverse service aisle again.
Step 402: when link failure being detected, is switched to the reverse protection passage pre-set by business transmission by service aisle, to utilize protection passage to make business be transferred to lower link point lower ring.
You need to add is that, the one direction that includes link failure break down namely the upper link point service aisle clockwise to lower link point or counterclockwise service aisle break down, and twocouese breaks down situation about namely all breaking down at the upper link point service aisle clockwise to lower link point and service aisle counterclockwise. Wherein, service aisle includes service aisle clockwise and service aisle counterclockwise.
The reverse protection passage pre-set, refers to the protection passage in opposite direction with the service aisle of looped network enterprising industry business transmission. Specifically, if business transmission carries out on service aisle clockwise, then now reverse protection passage is for protecting passage counterclockwise; If business transmission carries out on service aisle counterclockwise, then now reverse protection passage is for protecting passage clockwise.
In actual applications, business transmission can select to transmit on service aisle clockwise as required, it is also possible to selects to transmit on service aisle counterclockwise. The load balancing that service aisle clockwise and service aisle counterclockwise transmit for business.
Here; owing to business can directly descend ring when protecting link point under arrival on passage; therefore; only business transmission need to be switched to the reverse protection passage pre-set by service aisle; can transmit by finishing service; and no longer as prior art, by business transmission by service aisle be switched to while reverse protection passage will protection channel switching to reverse operation passage. So, it is to avoid the formation of Wrapping looped network intermediate ring road.
Further, business transmission is switched to the reverse protection passage pre-set by service aisle, specifically includes: utilize ring label that by service aisle, business transmission is switched to the reverse protection passage pre-set.
For example, service aisle clockwise be denoted as Rcw, counterclockwise protection passage be denoted as Rap, service aisle counterclockwise be denoted as Raw, clockwise protection passage be denoted as Rcp. So, correspond to for ring label on every passage of node A, node A: Rcw_A, Rap_A, Raw_A, Rcp_A. So, business transmission is switched to by service aisle counterclockwise and protects passage clockwise by node E, it is possible to realize by ring label is exchanged for Rcp_F by Raw_E.
Further, after business transmission is switched to by service aisle the reverse protection passage pre-set, also includes: when link failure recovery being detected, enter Wait-to-Restore (WTR, WaitToRestore) state, and judge whether Preset Time arrives; If Preset Time does not arrive, the reverse protection passage pre-set is utilized to make business be transferred to lower link point; If Preset Time arrives, utilize service aisle that business is transferred to lower link point.
Preferably, it is judged that whether Preset Time arrives, and specifically includes: utilize intervalometer to judge whether Preset Time arrives.
Embodiment one
Below for scene shown in Fig. 5, in the situation that one direction breaks down, namely at the upper link point service aisle clockwise to lower link point or when service aisle breaks down counterclockwise, the ring net protection method that the embodiment of the present invention is provided is described in detail. As it is shown in figure 5, business is by ring on node F, ring under lower link point C, the link between node E and node D breaks down, and method includes:
Step 501: pre-setting service aisle clockwise is: D-> E-> F-> A-> B-> C, protects passage counterclockwise: B-> A-> F-> E-> D-> C, service aisle counterclockwise: B-> A-> F-> E-> D-> C, protect passage clockwise: D-> E-> F-> A-> B-> C;
Step 502: business is ring on node F, utilizes service aisle business counterclockwise transmission to arrive node E;
Step 503: node E detects anticlockwise link failure, is switched to business transmission by service aisle counterclockwise and protects passage clockwise;
Step 504: node E utilizes clockwise protection passage to make business be transferred to lower link point C, and under lower link point C ring.
It can be seen that utilize the ring net protection method that the embodiment of the present invention provides, transmission path is F-> E-> F-> A-> B-> C; no longer it is looped back on service aisle through node D as Fig. 2, so, decreases the redundant path of business transmission; save the network bandwidth, improve switching performance.
Embodiment two
Below for scene shown in Fig. 6; when twocouese breaks down; namely, when the upper link point service aisle clockwise to lower link point and service aisle counterclockwise all break down, the ring net protection method that the embodiment of the present invention is provided is described in detail. As shown in Figure 6, business by ring on node F, ring under lower link point C, the link between node E and node D breaks down, and the link between node A and node B breaks down, and method includes:
Step 601: pre-setting service aisle clockwise is: D-> E-> F-> A-> B-> C, protects passage counterclockwise: B-> A-> F-> E-> D-> C, service aisle counterclockwise: B-> A-> F-> E-> D-> C, protect passage clockwise: D-> E-> F-> A-> B-> C;
Step 602: business is ring on node F, utilizes service aisle counterclockwise that business is transferred to node E;
Step 603: node E detects anticlockwise link failure, is switched to business transmission by service aisle counterclockwise and protects passage clockwise;
Step 604: node E utilizes protection passage clockwise to make business be transferred to node A;
Step 605: when node A detects clockwise link failure, business is abandoned.
Here, business transmission can only be switched to by service aisle clockwise and protect passage counterclockwise by node A, and channel switching will cannot be protected clockwise to arrive service aisle counterclockwise. It is to say, at this moment node A is only with protection channel transfer business clockwise, if clockwise link failure cannot to next node-node transmission, then business is abandoned by node A, to avoid loop to produce.
Embodiment three
Continuing for scene shown in Fig. 6, when twocouese breaks down and recovers, the ring net protection method that the embodiment of the present invention is provided is described in detail, and method includes:
Step 606: when node A detects the link failure recovery between node A and node B, enters WTR state;
Step 607: if node A receives the message that between node E and node D, fault does not eliminate, then perform step 608; If node A receives the message of Failure elimination between node E and node D, then perform step 609;
Step 608: utilize protection passage clockwise to make business be transferred to lower link point C.
Step 609: enter WTR state, and before Preset Time arrives, utilize protection passage clockwise to make business be transferred to lower link point C; When Preset Time arrives, utilize service aisle counterclockwise that business is transferred to lower link point C.
The technical scheme of the looped network protection of cancellation loop provided by the invention, by pre-setting the protection passage terminating in lower link point; When fault being detected; business transmission is switched to the reverse protection passage pre-set by service aisle; the described protection passage is utilized to make business be transferred to described lower link point lower ring, it is to avoid the generation of loop when breaking down in the upper link point clockwise path to lower link point and anticlockwise path simultaneously.
The structural representation of a kind of looped network protection device that Fig. 7 provides for the embodiment of the present invention, this device includes: arrange unit 701 and switch unit 702, wherein:
Described unit 701 is set, is used for pre-setting protection passage;
Described switch unit 702, for when fault being detected, is switched to business transmission by service aisle and reverse arranges the protection passage that unit 701 pre-sets, to utilize described protection passage to make business be transferred to lower link point time ring.
Further, described arrange unit 701 specifically for: pre-set the protection passage terminating in lower link point.
Further, described switch unit 702 specifically for: utilize ring label by business transmission be switched to the reverse protection passage pre-set by service aisle.
Further, described switch unit 702 specifically for: described business transmission is switched to the reverse protection passage pre-set by service aisle after, if link failure recovery being detected, then enter Wait-to-Restore WTR state, and judge whether Preset Time arrives; If Preset Time does not arrive, then the described reverse protection passage pre-set is utilized to make business be transferred to lower link point; If Preset Time arrives, then utilize described service aisle that business is transferred to lower link point.
Further, described switch unit 702 specifically for: utilize intervalometer to judge whether Preset Time arrives.
The flow chart of the another kind of ring net protection method that Fig. 8 provides for the embodiment of the present invention, the method is applied to any node in looped network, and key step describes as follows:
Step 801: node receives the business datum of transmission in looped network;
Step 802: if node detect business datum be transmitted by service aisle on first direction in looped network and on service aisle be positioned at described node after transmission link break down, then business datum is switched in looped network by service aisle and the protection passage in first direction opposite second direction is transmitted; If node detect business datum be by the protection channel transfer in second direction in looped network and protection passage on be positioned at described node after transmission link break down, then terminate the transmission of business datum.
If it should be noted that first direction clockwise, then be counter clockwise direction with first direction opposite second direction; If first direction is counterclockwise, then be clockwise direction with first direction opposite second direction.
You need to add is that, service aisle is positioned at the transmission link after described node, for being positioned at the transmission link after described node on the current transmission direction of service aisle, including the transmission link between often adjacent two nodes after described node on the current transmission direction of service aisle; Protection passage on be positioned at the transmission link after described node; for protection passage current transmission direction on be positioned at the transmission link after described node, including protection passage current transmission direction on often adjacent two nodes after described node between transmission link. For example, shown in Fig. 5, business is by ring on node F, through anticlockwise service aisle ring under lower link point C, transmission path is: F-> E-> D-> C, service aisle so in the counterclockwise direction is positioned at the transmission link after node E, including the transmission link between node E to node D and the transmission link between node D to node C.
Further, protection passage terminates in lower link point.
Here, owing to protection passage being arranged on lower link point termination, business is so made can directly to descend ring when protecting link point under arrival on passage, without being switched on reverse service aisle as prior art again.
Further, nodal test go out on service aisle be positioned at described node after transmission link break down, specifically include: the link that nodal test goes out between next node adjacent with node on service aisle and node breaks down; Nodal test go out protect on passage be positioned at described node after transmission link break down, specifically include: nodal test goes out to protect the link between next node adjacent with node on passage and node to break down.
The structural representation of the another kind of looped network protection device that Fig. 9 provides for the embodiment of the present invention, this device is applied to any node in looped network, including: receive unit 901 and detection unit 902, wherein:
Receive unit 901, for receiving the business datum of transmission in looped network;
Detection unit 902, for detect receive the business datum that unit 901 receives be by looped network in service aisle transmission on first direction and on service aisle be positioned at described node after transmission link break down time, business datum is switched in looped network by service aisle and the protection passage in first direction opposite second direction is transmitted; Detect receive the business datum that unit 901 receives be by looped network in protection channel transfer in second direction and on protection passage be positioned at described node after transmission link break down time, the transmission of termination business datum.
Further, protection passage terminates in lower link point.
Further, detection unit 902 specifically for: detect receive the business datum that unit 901 receives be by looped network in service aisle transmission on first direction, and when link between the next node adjacent with node and node breaks down on service aisle, business datum is switched in looped network by service aisle and the protection passage in first direction opposite second direction is transmitted; Detect receive the business datum that unit 901 receives be by looped network in protection channel transfer in second direction, and when on protection passage, link between the next node adjacent with node and node breaks down, the transmission of termination business datum.
Although the embodiment that disclosed herein is as above, but described content is only the embodiment readily appreciating the present invention and adopt, and is not limited to the present invention. Technical staff in any art of the present invention; under the premise without departing from the spirit and scope that disclosed herein; any amendment and change can be carried out in the form implemented and details; but the scope of patent protection of the present invention, still must be as the criterion with the scope that appending claims defines.
Claims (16)
1. a ring net protection method, it is characterised in that including:
Pre-set protection passage;
When link failure being detected, business transmission is switched to the reverse protection passage pre-set by service aisle, to utilize described protection passage to make business be transferred to lower link point lower ring.
2. ring net protection method according to claim 1, it is characterised in that described in the protection passage that pre-sets terminate in lower link point.
3. ring net protection method according to claim 1, it is characterised in that described business transmission is switched to the reverse protection passage pre-set by service aisle, specifically includes:
Utilize ring label that by service aisle, the transmission of described business is switched to the reverse protection passage pre-set.
4. ring net protection method according to claim 1, it is characterised in that described business transmission is switched to the reverse protection passage pre-set by service aisle after, also include:
When described link failure recovery being detected, enter Wait-to-Restore WTR state, and judge whether Preset Time arrives; If Preset Time does not arrive, then the described reverse protection passage pre-set is utilized to make business be transferred to lower link point; If Preset Time arrives, then utilize described service aisle that business is transferred to lower link point.
5. ring net protection method according to claim 4, it is characterised in that utilize intervalometer to judge whether described Preset Time arrives.
6. a looped network protection device, it is characterised in that including: unit and switch unit are set, wherein:
Described unit is set, is used for pre-setting protection passage;
Described switch unit, for when fault being detected, is switched to business transmission by service aisle and reverse described arranges the protection passage that unit pre-sets, to utilize described protection passage to make business be transferred to lower link point time ring.
7. looped network protection device according to claim 6, it is characterised in that the described unit that arranges is specifically for pre-setting the protection passage terminating in lower link point.
8. looped network protection device according to claim 6, it is characterised in that described switch unit specifically for:
Utilize ring label that by service aisle, business transmission is switched to the reverse protection passage pre-set.
9. looped network protection device according to claim 6, it is characterised in that described switch unit specifically for:
Described business transmission is switched to the reverse protection passage pre-set by service aisle after, if link failure recovery being detected, then enter Wait-to-Restore WTR state, and judge whether Preset Time arrives; If Preset Time does not arrive, then the described reverse protection passage pre-set is utilized to make business be transferred to lower link point; If Preset Time arrives, then utilize described service aisle that business is transferred to lower link point.
10. looped network protection device according to claim 9, it is characterised in that described switch unit specifically for:
Intervalometer is utilized to judge whether Preset Time arrives.
11. a ring net protection method, it is applied to any node in looped network, it is characterised in that including:
Described node receives the business datum of transmission in looped network;
If described node detect described business datum be on that transmitted by service aisle on first direction in described looped network and described service aisle be positioned at described node after transmission link break down, then the protection passage that described business datum is switched in second direction opposite to the first direction in described looped network by described service aisle is transmitted;
If described node detect described business datum be by the protection channel transfer in second direction described in described looped network and described protection passage be positioned at described node after transmission link break down, then terminate the transmission of described business datum.
12. ring net protection method according to claim 11, it is characterised in that described protection passage terminates in lower link point.
13. ring net protection method according to claim 11, it is characterised in that
Described nodal test go out on described service aisle be positioned at described node after transmission link break down, specifically include: the transmission link that described nodal test goes out between next node adjacent with described node on described service aisle and described node breaks down;
Described nodal test go out on described protection passage be positioned at described node after transmission link break down, specifically include: the transmission link that described nodal test goes out on described protection passage between the next node adjacent with described node and described node breaks down.
14. a looped network protection device, it is applied to any node in looped network, it is characterised in that including: receive unit and detection unit, wherein:
Described reception unit, for receiving the business datum of transmission in looped network;
Described detection unit, for detect the business datum that described reception unit receives be by described looped network in service aisle transmission on first direction and on described service aisle be positioned at described node after transmission link break down time, the protection passage that described business datum is switched in second direction opposite to the first direction in described looped network by described service aisle is transmitted; Detect the business datum that described reception unit receives be by the protection channel transfer in second direction described in described looped network and described protection passage be positioned at described node after transmission link break down time, terminate the transmission of described business datum.
15. looped network protection device according to claim 14, it is characterised in that described protection passage terminates in lower link point.
16. looped network protection device according to claim 14, it is characterised in that described detection unit specifically for:
Detect the business datum that described reception unit receives be by described looped network in service aisle transmission on first direction, and when on described service aisle, link between the next node adjacent with described node and described node breaks down, the protection passage that described business datum is switched in second direction opposite to the first direction in described looped network by described service aisle is transmitted; Detecting that the business datum that described reception unit receives is by the protection channel transfer in second direction described in described looped network; and when link between the next node adjacent with described node and described node breaks down on described protection passage, terminate the transmission of described business datum.
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