CN100401712C - Fault treating method for phase switching loop of automatic protection system of Ethernet - Google Patents
Fault treating method for phase switching loop of automatic protection system of Ethernet Download PDFInfo
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Abstract
The present invention discloses a fault treating method for phase switching loops of an Ethernet automatic protection system, which comprises the following procedures: one main loop is selected from at least two EAPS loops contained in EAPS switching loops, the main loop is provided with a main site, the other EAPS loops are determined as assistant loops which are respectively provided with a main site, and the set results are stored on all intersecting sites of the EAPS switching loops. After a fault of a sharing link is detected by the intersecting sites, different alarm notices are respectively sent to the main site of the main loop and the main sites of the assistant loops according to the previous set. The main site of the main loop executes the protection switching operation according to the received alarm notices, and after the main sites of the assistant loops receive the alarm notices, autologous shielding operation is carried out to prevent the autologous protection switching operation. The method of the present invention prevents a loop closing condition in a fault treating process from reducing the network performance, increases the failure resistance of the EAPS switching loops, and greatly expands the net assembling application of the EAPS loops.
Description
Technical field
The present invention relates to the network protection technology, refer to a kind of fault handling method of Ethernet phase switching loop of automatic protection system especially.
Background technology
Ethernet automatic protective system (EAPS, Ethernet Automatic Protect System) ring is a kind of network protection technology that generally adopts, and a plurality of websites are interconnected to constitute an EAPS ring, have only a home site on the ring, and all the other all are from website.Have service VLAN that sends business datum and the control VLAN that transmits control message on the EAPS ring, for service VLAN, home site blocks the physical port of self.
What Fig. 1 (a) showed is the basic composition of EAPS ring, a home site M and three is arranged from website T1, T2 and T3 on this EAPS ring.The EAPS ring is in initial condition under the normal condition, and the standby port of home site M blocks, and this standby port is represented with the gray circles among Fig. 1 (a).At this moment, the link between M and the T1 is in blocked state as the reserve link of EAPS ring.Above-mentioned network configuration can guarantee that the Spanning-Tree Protocol (STP, Spanning Tree Protocol) on the EAPS ring is a chain on the one hand, thereby avoids unknown unicast and broadcasting the phenomenon of broadcast (sites) in turn to occur on loop network; Can guarantee that on the other hand four websites on the EAPS ring communicate with each other, and promptly can reach between any two websites on the EAPS ring.
When on detecting the EAPS ring, having fault; assumed fault is shown in Fig. 1 (b); link generation physical discontinuity between T2 and the T3; in order to guarantee the unimpeded of network service; home site meeting execute protection switching operation; open the standby port of self fast, nonserviceabling with four websites on the assurance EAPS ring still communicates with each other down.
Fault detect to EAPS ring has two kinds of methods usually, one, by home site the EAPS ring is detected; After the slave station point that two, breaks down detects fault, send alarm information to home site.
The method that A, home site detect is as follows:
EAPS ring with Fig. 1 (a) is an example, home site M periodically sends the Hello detect-message in a side ports, if link on the ring and/or equipment all are in normal condition, described Hello detect-message is transmitted by the website on the EAPS ring, can intactly return the opposite side port of home site.According to the Hello detect-message of normally returning, home site M judges that the EAPS ring is in normal condition.
Home site is when sending the Hello detect-message; can start timer conter; this timer conter is provided with the return time upper limit of Hello detect-message; suppose that it is 5ms that a Hello detect-message is transmitted the time of a circle on the EAPS ring that five websites are formed; and this timer conter is made as 15ms; after so continuous three Hello detect-message were not normally returned, home site just can judge that link and/or equipment on the ring break down, and needed to start protection fast and switched.
If the Hello detect-message is normally returned in 5ms, home site sends reset signal to timer conter, with the current numerical value zero clearing of this counter after judging that return messages are correct.Like this, as long as the Hello detect-message is regularly returned, timer conter just can not overflow, and home site is also without the execute protection switching operation.
B, as follows from the method for station alarm:
Except the Hello message detection mechanism of home site, EAPS ring also provides a kind of method that can faster detection Link State: from station alarm.
Be example with Fig. 1 (b) still, suppose that the link between T2 and the T3 disconnects, this moment, T3 can find this situation, and initiatively sent the alarm information that opens circuit to home site M.Home site M receives the alarm information from T3, knows the failure condition of EAPS ring.
If using from Site Port of breaking down is Ethernet electricity mouthful, should can detect off state from ethernet physical layer chip of website; If the light mouth, optical module can detect disconnected fine state so.
Detect than home site self from the method for station alarm, detection speed is fast.But, be only applicable to the situation of link failure from station alarm.For the fault that can't operate as normal from the website equipment of itself causes, such as device powers down, slave station is named a person for a particular job and can't be sent alarm information.
Home site is understood the execute protection switching operation after knowing EAPS ring fault, detailed process is as follows:
1) opens the standby port of own service VLAN, make to keep between the website on the EAPS ring communicating.In Fig. 1 (b), if enable reserve link between M and the T1, four websites in this EAPS ring still can guarantee to communicate with each other.
2) home site sends control messages, notifies the website on the ring of self place to upgrade mac address table according to current network topology.Said process adopts existing two layers of retransmission technique to realize, each website is known the upward MAC Address of all websites of ring by study, does not give unnecessary details herein.
Further, home site can also be closed the timer conter of self, to reduce unnecessary CPU expense.
After executing above-mentioned protection switching operation; can't provide protection after breaking down once more on the EAPS ring; home site can be after fault recovery; as early as possible the EAPS ring cutting is gained initial condition; thereby displace the standby port of home site; switch so that protect in follow-up fault, the operation that above-mentioned recovery is switched is specific as follows:
A, detection failure recovery situation, described detection method have home site to detect and slave station point detects these two kinds.
Even when being in fault/guard mode, home site also can periodically send the Hello detect-message,, just prove that the EAPS ring also is in fault/guard mode if the Hello detect-message is not normally returned.If the Hello detect-message is returned, illustrate that the fault on the EAPS ring is recovered.At this moment, home site can switch back initial condition.
Slave station point detect to rely on and to carry out from website self, and the physical port that detects self such as the slave station point just sends the loop normal messages to home site after becoming normally (UP), notifies the home site fault to recover.
B, execution recover to switch.
Recover if home site detects loop, will send fault recovery message from website, carry counter in this message, be used to notify the time that switches to initial condition from website to each.When arrived in switching time, home site blocked the standby port of service VLAN, and upgraded the mac address table of main ring according to current network topology, made EAPS be looped back to initial condition.
Recover if the slave station point detects loop, can notify home site immediately, and receiving the work that home site notifies the back recovery to open circuit port from website.
The above is all the fault handling method of single EAPS ring.Network topology in the practical application is generally comparatively complicated, such as there being a plurality of EAPS rings in the network, and the tangent formation EAPS tangent rings of a plurality of EAPS ring.Shown in Fig. 2 (a), the EAPS tangent rings among the figure comprises ring 1 and ring 2, and website M1, R1, R2 and R3 belong to ring 1, and wherein M1 is a home site; Website M2, R3, R2 and R4 belong to ring 2, and wherein M2 is a home site.Find out that from Fig. 2 (a) a pair of port of ring 1 and ring 2 shared website R2 and R3 is called the crossing website of ring 1 and ring 2 with R2 and R3, the link between R2 and the R3 is the shared link of EAPS tangent rings.Correspondingly, all the other links are non-shared link such as the link between M1 and the R3.In actual use, a pair of port of R2 and R3 can be the port of a pair of high speed (such as 10GE), or the bond ports of a plurality of physical ports.
Under the normal condition, can be with ring 1 M1 and the port between the R1, and encircle on 2 the M2 and the port block between the R4, respectively as the standby port of these two rings.Suppose that broken string appears in the link between R2 and the R3, after two home sites of ring 1 and ring 2 detect above-mentioned fault, all can execute protection switch the standby port of self is opened that then network configuration becomes shown in Fig. 2 (b).In Fig. 2 (b), ring 1 and ring 2 no longer are the networking states of chain, but form a closed loop by M1, R1, R2, R4, M2 and R3.According to the forwarding principle of ethernet device, any one ethernet data frame all can be transmitted in above-mentioned closed loop cocycle, occurs the phenomenon that the Frame cycle transmits, site apparatus receives a large amount of repeating frames on the ring thereby make, and finally causes network unavailable.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of fault handling method of Ethernet phase switching loop of automatic protection system, causes network performance to descend with the situation of avoiding occurring closed loop in the fault treating procedure, improves the fault-resistant ability of EAPS tangent rings.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of fault handling method of Ethernet automatic protective system EAPS tangent rings; from at least two EAPS rings that described EAPS tangent rings comprises, select an EAPS ring and be set to main ring; a home site is arranged in the main ring; all the other EAPS rings are set to from ring; each has a home site from ring; and on all crossing websites of EAPS tangent rings, preserve above-mentioned main ring and from ring the result is set, this method may further comprise the steps:
A1, intersect website and detect shared link and whether break down, after detecting shared link and breaking down,, report fault masking message to all home sites from ring to the home site report and alarm message of main ring;
The home site of b1, main ring shields self after the home site that encircles receives fault masking message according to the alarm information execute protection switching operation that receives, and makes self not execute protection switching operation.
Described on all crossing websites of EAPS tangent rings, preserve above-mentioned main ring and the result be set from ring also comprise: alarm information and fault masking message are set, and to specify described alarm information be the message that sends to main ring, and specified fault shielding message is the message that sends to from ring.
Described alarm information and fault masking message are kept in the asic chip that intersects website.
Described fault masking message carries the shielding time, then the described home site from ring of step b1 receives the method that after the fault masking message self is shielded and is: periodically issue loop detection message from the home site of ring, and start timer conter timing is carried out in the transmission of this detect-message; From the ring home site detect described timer conter overtime after, judge whether to be in the shielding time, if then keep current state, otherwise start the state machine execute protection switching operation of self.
The home site of the described main ring of step b1 according to the method for the alarm information execute protection switching operation that receives is: the home site of main ring is opened the standby port of self, and upgrades the mac address table of main ring according to current network topology.
This method further comprises after the step b1:
After c1, crossing website detect the shared link recovery, report the fault recovery notice to the home site of main ring with from the home site that encircles respectively;
The home site of d1, main ring blocks the standby port that is in open mode, and upgrades the mac address table of main ring according to current network topology; After receiving fault recovery notice from the home site of ring, upgrade the mac address table of self place ring according to current network topology.
The described crossing website of step a1 detects the method whether shared link break down: crossing website detects self port when unavailable, judges further whether described port is the port of shared link, if then break down for shared link.
Described shared link is the single physical link, or bundlees the link that forms by at least two physical links.
A kind of fault handling method of Ethernet automatic protective system EAPS tangent rings; from at least two EAPS rings that described EAPS tangent rings comprises, select an EAPS ring and be set to main ring; a home site is arranged in the main ring; all the other EAPS rings are set to from ring; each has a home site from ring; and on all crossing websites of EAPS tangent rings, preserve above-mentioned main ring and from ring the result is set, this method may further comprise the steps:
A2, intersect website when detecting self port discovery network failure, further whether failure judgement appears on the shared link, if execution in step c2 then, otherwise execution in step b2;
B2, crossing website send the home site of alarm notification to the guilty culprit ring, and by the home site execute protection switching operation of guilty culprit ring, processing procedure finishes;
C2, intersect the home site report and alarm message of website, report fault masking message to all home sites from ring to main ring;
The home site of d2, main ring shields self after the home site that encircles receives fault masking message according to the alarm information execute protection switching operation that receives, and makes self not execute protection switching operation, and processing procedure finishes.
The described crossing website of step a2 judges that the method for shared link fault is: intersects website and judges according to self being provided with whether described port is the port of shared link, if then for shared link breaks down, and execution in step c2; Otherwise break down execution in step b2 for non-shared link.
As seen from the above technical solution, the fault handling method of this Ethernet phase switching loop of automatic protection system of the present invention, from a plurality of EAPS rings that the EAPS tangent rings comprises, determine a main ring, and when shared link breaks down, give the home site of main ring by intersecting website report and alarm message, the standby port that makes the home site of main ring open self is switched network protection; Simultaneously; intersect website and send fault masking message to home site from ring; thereby at the appointed time inner shield is switched from the ring execute protection; cause network performance to descend with the situation of avoiding occurring closed loop in the fault treating procedure; improve the fault-resistant ability of EAPS tangent rings, greatly expanded the networking of EAPS ring and used.
Description of drawings
Fig. 1 (a) is the basic composition of single EAPS ring in the prior art;
The schematic diagram that Fig. 1 (b) breaks down for the ring of EAPS shown in Fig. 1 (a);
Fig. 2 (a) is the basic composition of EAPS tangent rings in the prior art;
Fig. 2 (b) is the schematic diagram after EAPS tangent rings execute protection is switched shown in Fig. 2 (a);
Fig. 3 is the flow chart of EAPS tangent rings troubleshooting in a preferred embodiment of the present invention;
The schematic diagram that Fig. 4 (a) breaks down for EAPS tangent rings in the one embodiment of the invention;
Fig. 4 (b) is the schematic diagram after EAPS tangent rings shown in Fig. 4 (a) carries out troubleshooting;
Fig. 5 is the flow chart of EAPS tangent rings troubleshooting in another preferred embodiment of the present invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
Among the present invention, from at least two EAPS rings that certain EAPS tangent rings comprises, select a main ring in advance, all the other EAPS rings are defined as from ring, and on all crossing websites of EAPS tangent rings, preserve the above-mentioned result that is provided with, in each EAPS tangent rings a main ring can only be arranged.
Main ring and comparatively various from the method for ring is set on crossing website, such as by being provided with that precedence that message sends is distinguished main ring and from ring, at first send the home site of alarm information to main ring, send fault masking message then to all home sites, and above-mentioned message order of transmission is kept in the asic chip that intersects website from ring.
Based on above-mentioned main ring and the setting from encircling, the described fault handling method of a preferred embodiment of the present invention may further comprise the steps as shown in Figure 3:
Step 301, intersect after website detects shared link and break down,, and report fault masking message to all home sites respectively from ring according to the home site report and alarm message that sets in advance to main ring.Above-mentioned notification message carries out hardware by the ACL mode to be transmitted fast, so that deliver to the purpose website as soon as possible.
In this step, when intersecting website, can further judge whether described fault appears on the shared link by detection self port discovery network failure.Described shared link is the single physical link, or bundlees the link that forms by at least two physical links.
Situation about breaking down for non-shared link intersects website according to the method for the prior art home site report and alarm message to the guilty culprit ring, and the home site of guilty culprit ring can be switched according to the alarm information execute protection, opens the standby port of self loop.The operation that non-shared link breaks down is same as the prior art, does not give unnecessary details herein.
Same as the prior art, can periodically issue the Hello detect-message from the home site that encircles, and the startup timer conter carries out timing.Still confiscate the detect-message of returning when described timer conter is overtime, just know network failure from the home site of ring, the state machine execute protection that then starts self is switched.
To switch in order stoping from the home site execute protection of ring, to intersect website and carry the shielding time mailing to from the fault masking message of ring home site, the described shielding time can be set to certain home site and execute protection and switch the required time, is generally 50ms.
The home site of step 302, main ring is according to alarm information execute protection switching operation, receive fault masking message from the home site of ring after, according to the shielding time shielding of carrying in this message self execute protection switching operation.
In this step; the protection switching operation that the home site of main ring is carried out is as follows: intersect website at all interior other websites on the home site notice main ring of main ring; the switching that performs loop is prepared; and at the appointed time open the standby port of self, upgrade the mac address table of all websites on the main ring simultaneously according to current network topology.
Meanwhile, from the ring home site after receiving fault masking message, in the shielding time, even it is overtime to detect timer conter, the state machine execute protection that does not also start self is switched.
Through the processing of said process, when network breaks down at shared link, the situation of double-layer loop just can not appear.
Be that example specifies said process with Fig. 4 (a) below, when the shared link between R2 and the R3 broke down, R2 and R3 can notify M1 and M2 respectively, and wherein M1 is the home site of main ring, and M2 is the home site from ring.After M1 received alarm information, the execute protection switching operation was opened standby port and is made the link between M1 and the R1 become path; And after M2 receives fault masking message, during main ring is carried out normal protection and switched,, do not open standby M2 and the link between the R4 even detect loop fault yet.
For the failure condition shown in Fig. 4 (a), after the protection that executes main ring was switched, it is normal that the data communication of whole EAPS tangent rings recovers, and shown in Fig. 4 (b), the Hello detect-message that this moment, M2 sent will normally be returned self website.
After the shared link between R2 and the R3 recovered, R2 and R3 can notify main ring and the home site from encircling respectively.At this moment, the home site of main ring upgrades the mac address table of main ring according to current network topology, and blocks the standby port that is in open mode, and main ring is returned to initial condition; After receiving fault recovery notice from the home site of ring, upgrade the mac address table of all websites on the self loop according to current network topology.
The described fault handling method of the another preferred embodiment of the present invention may further comprise the steps as shown in Figure 5:
Step 501, intersect website when detecting self port discovery network failure, further whether failure judgement appears on the shared link, if execution in step 503 then, otherwise execution in step 502.
In this step, intersect website and comprise following several situation by the network failure that detects self port discovery: self port that 1) intersects website breaks down, and then the link that is connected with this port is unavailable; 2) port of another website that is connected with this crossing website breaks down, and then respective links is also unavailable; 3) port of link both sides website is all available, but faults such as broken string appear in link self.
Step 502, crossing website send the home site of alarm notification to the guilty culprit ring, and by the home site execute protection switching operation of guilty culprit ring, processing procedure finishes.
Step 503, intersect website and send different alarm notifications respectively with home site from ring according to setting in advance to the home site of main ring.
The home site of step 504, main ring shields self after the home site that encircles receives alarm notification according to the alarm notification execute protection switching operation that receives, and makes self not execute protection switching operation, and processing procedure finishes.
By the above embodiments as seen; the fault handling method of this Ethernet phase switching loop of automatic protection system of the present invention; from a plurality of EAPS rings that the EAPS tangent rings comprises, determine a main ring; and the standby port of only opening self by the home site of main ring when shared link breaks down is switched network protection; thereby the situation of avoiding occurring closed loop in the fault treating procedure causes network performance to descend; improve the fault-resistant ability of EAPS tangent rings, greatly expanded the networking of EAPS ring and used.
Claims (9)
1. the fault handling method of an Ethernet automatic protective system EAPS tangent rings; it is characterized in that; from at least two EAPS rings that described EAPS tangent rings comprises, select an EAPS ring and be set to main ring; a home site is arranged in the main ring; all the other EAPS rings are set to from ring; each has a home site from ring, and preserves above-mentioned main ring and from ring the result is set on all crossing websites of EAPS tangent rings, and this method may further comprise the steps:
A1, intersect website and detect shared link and whether break down, after detecting shared link and breaking down,, report fault masking message to all home sites from ring to the home site report and alarm message of main ring;
The home site of b1, main ring shields self after the home site that encircles receives fault masking message according to the alarm information execute protection switching operation that receives, and makes self not execute protection switching operation.
2. method according to claim 1, it is characterized in that, described on all crossing websites of EAPS tangent rings, preserve above-mentioned main ring and the result be set from ring also comprise: alarm information and fault masking message are set, and to specify described alarm information be the message that sends to main ring, and specified fault shielding message is the message that sends to from ring.
3. method according to claim 2 is characterized in that, described alarm information and fault masking message are kept in the asic chip that intersects website.
4. method according to claim 2, it is characterized in that, described fault masking message carries the shielding time, then the described home site from ring of step b1 receives the method that after the fault masking message self is shielded and is: periodically issue loop detection message from the home site of ring, and start timer conter timing is carried out in the transmission of this detect-message; From the ring home site detect described timer conter overtime after, judge whether to be in the shielding time, if then keep current state, otherwise start the state machine execute protection switching operation of self.
5. method according to claim 1; it is characterized in that; the home site of the described main ring of step b1 according to the method for the alarm information execute protection switching operation that receives is: the home site of main ring is opened the standby port of self, and upgrades the mac address table of main ring according to current network topology.
6. method according to claim 5 is characterized in that, this method further comprises after the step b1:
After c1, crossing website detect the shared link recovery, report the fault recovery notice to the home site of main ring with from the home site that encircles respectively;
The home site of d1, main ring blocks the standby port that is in open mode, and upgrades the mac address table of main ring according to current network topology; After receiving fault recovery notice from the home site of ring, upgrade the mac address table of self place ring according to current network topology.
7. method according to claim 1, it is characterized in that, the described crossing website of step a1 detects the method whether shared link break down: crossing website detects self port when unavailable, further judge whether described port is the port of shared link, if then break down for shared link.
8. method according to claim 1 is characterized in that, described shared link is the single physical link, or bundlees the link that forms by at least two physical links.
9. the fault handling method of an Ethernet automatic protective system EAPS tangent rings; it is characterized in that; from at least two EAPS rings that described EAPS tangent rings comprises, select an EAPS ring and be set to main ring; a home site is arranged in the main ring; all the other EAPS rings are set to from ring; each has a home site from ring, and preserves above-mentioned main ring and from ring the result is set on all crossing websites of EAPS tangent rings, and this method may further comprise the steps:
A2, intersect website when detecting self port discovery network failure, further whether failure judgement appears on the shared link, if execution in step c2 then, otherwise execution in step b2;
B2, crossing website send the home site of alarm notification to the guilty culprit ring, and by the home site execute protection switching operation of guilty culprit ring, processing procedure finishes;
C2, intersect the home site report and alarm message of website, report fault masking message to all home sites from ring to main ring;
The home site of d2, main ring shields self after the home site that encircles receives fault masking message according to the alarm information execute protection switching operation that receives, and makes self not execute protection switching operation, and processing procedure finishes.
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| CN100589427C (en) * | 2007-02-14 | 2010-02-10 | 中兴通讯股份有限公司 | A Method for Automatic Protection of Ethernet |
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| CN1207225A (en) * | 1996-11-12 | 1999-02-03 | 株式会社东芝 | Communication network system and rebuilding thereof |
| CN1295397A (en) * | 1999-11-04 | 2001-05-16 | 深圳市中兴通讯股份有限公司 | Automatically protected switching method and device in high rate SDH loop |
| US20020064166A1 (en) * | 2000-11-28 | 2002-05-30 | Hiromune Suetsugu | Ring interconnection network system, node equipment, network management equipment, and path setting method |
| CN1640066A (en) * | 2002-02-22 | 2005-07-13 | 西门子公司 | Local network, particularly Ethernet network having redundancy properties, and redundancy manager for such a network |
-
2005
- 2005-10-14 CN CNB2005101129542A patent/CN100401712C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1207225A (en) * | 1996-11-12 | 1999-02-03 | 株式会社东芝 | Communication network system and rebuilding thereof |
| CN1295397A (en) * | 1999-11-04 | 2001-05-16 | 深圳市中兴通讯股份有限公司 | Automatically protected switching method and device in high rate SDH loop |
| US20020064166A1 (en) * | 2000-11-28 | 2002-05-30 | Hiromune Suetsugu | Ring interconnection network system, node equipment, network management equipment, and path setting method |
| CN1640066A (en) * | 2002-02-22 | 2005-07-13 | 西门子公司 | Local network, particularly Ethernet network having redundancy properties, and redundancy manager for such a network |
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| CN1747439A (en) | 2006-03-15 |
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