CN1319320C - Method for realizing link state feed-through in network - Google Patents
Method for realizing link state feed-through in network Download PDFInfo
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- CN1319320C CN1319320C CNB021525315A CN02152531A CN1319320C CN 1319320 C CN1319320 C CN 1319320C CN B021525315 A CNB021525315 A CN B021525315A CN 02152531 A CN02152531 A CN 02152531A CN 1319320 C CN1319320 C CN 1319320C
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Abstract
The present invention discloses a method for realizing the link state feed-through in a network, which is used for informing an opposite terminal under the condition that a link generates faults. The method comprises the following steps: whether a link is in fault is judged in a service equipment detection network; when the link is in fault in the network, the service equipment uses a control frame to transmit the link fault information to the service equipment of the opposite terminal; the service equipment of the opposite terminal responds to the received control frame containing the link fault information to cut off the user link and carry out the corresponding process; the user at the fault terminal is communicated with the user at the opposite terminal by a backup network; when the link returns to normal, the service equipment of a recovery terminal transmits the control frame containing the link fault recovery information to the service equipment of the opposite terminal to establish the communication between the users on the link again. The opposite terminal can be informed under the condition that the link generates faults in the present invention, and moreover, the present invention can ensure less extra spending as much as possible in the process of the normal network operation.
Description
Technical field
The present invention relates to network service, particularly a kind of method that on point-to-point access network, realizes access point Link State, the break-through of service link state.
Technical background
In engineering was used, the data between the user entered network to realize data interaction by access device.Fig. 1 is the user carries out data interaction by point-to-point access network a schematic diagram.As shown in Figure 1, under the normal condition, user 1, user 2 communicate by letter with link establishment by service equipment, and link mainly comprises access point link 1, service network and access point link 2.When link breaks down, that is, when access point link or service network break down, user 1 and user's 2 communication disruption.For important user, need start backup network when this type of fault occurring, to guarantee that significant data can normal transmission.Backup network can be taked various ways, for example rents a link more, perhaps builds radio communication or satellite communication etc. between user 1 and user 2.When the access point link broke down, the user can detect the fault of link, and started backup network, attempts to use backup network and end subscriber is communicated.For for end subscriber, it does not also know to have taken place link failure, still uses former network to communicate; Communication between two users as a result is in off-state.When service network broke down, two end subscribers did not know that network can not use, so two ends communication disconnects.If can give the state transfer of link to end subscriber, promptly realize the Link State Pass Through function, just can start backup network to end subscriber so, on backup network, rebulid and the linking of user 1 or user 2.
In order to allow end subscriber is known that fault has taken place link, can adopt several different methods, a kind of typical method is: pass through regularly between user 1 and the user 2 the announcement mode, tell the other side with the link information of local terminal, when can not receive the link information that the opposite end sends over for a long time, think that fault has taken place link, the user stops to use backup network to communicate automatically to accusing link information; Another kind of typical method is: user 1 and user 2 detect the operating position of backup network in real time, have used backup network as long as detected either party, and an other side also changes the use backup network into.
Though said method can be dealt with problems to a certain extent, there are some drawbacks: the first, under normal circumstances, regularly can take the network bandwidth, thereby need pay extra network overhead to accusing link information; The second, occur when congested when network, time-delay can occur, the operation that might lead to errors because of false judgment accusing link information; If the 3rd to the backup network detection, need take the part bandwidth of backup network, this also can bring overhead to network; Four, when link-recovery just often, how both sides leave backup network, get back to job network also is a problem.
Summary of the invention
In order to solve the above-mentioned drawback that exists in the prior art, the objective of the invention is to propose Link State Pass Through method in a kind of opposite end that can either send a notice in the situation that link breaks down can guarantee to pay the little overhead of trying one's best again when the network operate as normal the network.
In order to realize above-mentioned purpose of the present invention, a kind of method that realizes Link State Pass Through in the network is provided, this method may further comprise the steps: service equipment detects whether link breaks down in the network; When link broke down in the network, service equipment utilized described control frame that link failure information is passed to the opposite end service equipment; The described control frame that contains link failure information that service equipment response in opposite end receives and disconnect user link are also handled accordingly; And the user of the user of fault end and opposite end communicates by backup network.
Further comprising the steps of according to method of the present invention:
When described link-recovery just often, the reset terminal service equipment sends the control frame contain link failure recovery information to the opposite end service equipment, again in the communication of setting up on the described link between the described user.
At least comprise network state information in the described control frame, be used to show link failure whether occurs.Described control frame can be standard ethernet frame, described network state information is inserted in the opcode field of described ethernet frame, or tunneling control frame, described network state information is inserted in the control field of described tunneling control frame, or signal label byte, described network state information is inserted in the described signal label byte.
Steps A also comprises the following steps of trembling processing:
Only when link is lasting unavailable in the given time, judge that just link breaks down; But and, judge that just link-recovery is normal only when the lasting in the given time time spent of link.
If described link failure is the access point fault, then the service equipment of fault end will send to the opposite end service equipment and contain the break down described control frame of information of access point, contain access point and break down behind the described control frame of information receiving, described opposite end service equipment will disconnect with to being connected of end subscriber, then the user of fault end with end subscriber is communicated by backup network;
If described link failure is the service network fault, then the service equipment of fault end will send to the opposite end service equipment and contain the break down described control frame of information of service network, and disconnection links with the fault end subscriber, contain service network and break down behind the described control frame of information receiving, described opposite end service equipment will disconnect with to being connected of end subscriber, then the user of fault end with end subscriber is communicated by backup network.
At link failure is under the situation of service network fault, only after the defencive function of having determined described service network self lost efficacy, carries out and the corresponding treatment step of service network fault again.
The invention has the beneficial effects as follows: 1) under the link reference performance, can not control by transmission control frame, so just can not take the bandwidth of job network and backup network, thereby save overhead; 2) by utilizing control frame mechanism to control the disconnection and the recovery of link, can not have side effects, thereby make things convenient for the upgrading and the maintenance of network legacy network; 3) in the present invention, adopted " going to tremble " to handle, thereby improved the reliability and the ease for use of network the judgement of link failure and recovery.
Description of drawings
Fig. 1 is the user carries out data interaction by point-to-point access network a schematic diagram;
Fig. 2 is the FB(flow block) according to Link State Pass Through method of the present invention;
Fig. 3 is according to the Link State Pass Through procedure chart under the described mode standard of the embodiment of the invention;
Fig. 4 is according to the Link State Pass Through procedure chart under the described mode of extension of the embodiment of the invention;
Fig. 5 is according to the described sequential chart that goes to tremble processing of the embodiment of the invention;
Fig. 6 is the diagram that reports according to described alarm of the embodiment of the invention and incident;
Fig. 7 is that described link break-through realizes state transition diagram according to the embodiment of the invention;
Fig. 8 is the composition schematic diagram according to the described control frame of the embodiment of the invention;
Fig. 9 is a kind of network configuration that is applicable to link break-through method of the present invention;
Figure 10 is the another kind of network configuration that is applicable to link break-through method of the present invention.
Embodiment
Fig. 2 is the general technical FB(flow block) according to Link State Pass Through method of the present invention.As shown in Figure 2, at first service equipment detects in the network link S1 that whether breaks down; S2 when link failure occurring, the service equipment of fault end utilizes described control frame that link failure information is passed to opposite end service equipment S3 by service network, after the control frame that receives from described service equipment, the opposite end service equipment will carry out corresponding treatment S 4, afterwards, the user of the user of fault end and opposite end communicates S5 by backup network.
Control frame can define in different ways, introduces three kinds of implementations below.
(1), use standard ethernet frame definition control frame, and realize the Link State Pass Through function in IP OVER SDH (based on the IP of SDH) network, the user is an Ethernet switch, service equipment is a SDH Ethernet access device.At first according to ethernet frame format definition control frame as shown in Figure 8, this control frame comprises following content:
Destination address (6 byte): global unique media interviews control (MAC) address;
Source address (6 byte): global unique mac address;
Type field (2 byte): 0xE140-represents that this frame is a Link State Pass Through function control frame;
Opcode field (2 byte):
The 0x0000-network failure is eliminated (Non_Broken message),
0x0200-network break down (Broken message);
Fill field (44 byte): insert byte of padding;
Check field (4 byte): the cyclic redundancy Crc32 check value of inserting Ethernet.
Next defines several time parameters: can be with reference to using the T0=500 millisecond, and T1=1～5 second, T2=5～10 second, T3=20 millisecond～1 second, T4=30 second～300 second.
After defining control frame form and time parameter, service equipment detects the link situation of service network working condition and access point link, can realize the Link State Pass Through function according to above illustrating to control.
Consideration needs to distinguish the fault point sometimes in network operation, to make things convenient for network operation; Should expand opcode field this moment.Command code after the expansion is defined as:
0x0000-access point fault is eliminated (Non_Broken message),
0x0100-service network fault is eliminated (Non_Broken message),
0x0200-access point break down (Broken message),
0x0300-service network break down (Broken message);
When the fault end detects the access point fault, send access point fault message; When the fault end detects the service network fault, send service network fault message.Equipment can select whether to support the mode of extension command code.
(2), use the tunneling control frame to realize the Link State Pass Through function
When using tunneling to realize the Link State Pass Through function, can use the control field of tunneling to define control frame.If use link access procedure SDH LAPS/ end-to-end protocol PPP/ High-Level Data Link Control HDLC tunneling, control field can be defined as follows:
The 0x70-network failure is eliminated (Non_Broken message), 0x72-network break down (Broken message);
Under the normal condition, control field is filled in the controlling value of acquiescence.When link failure, fault end equipment is inserted in control field has the as above controlling value of special implication, is used for notifying the opposite equip. Link State of this moment.When opposite equip. is received the controlling value of representing link failure, handle according to controlling value.Behind link-recovery, equipment recovers to send normal controlling value.
Same equipment can select to use the controlling value of expansion, and the expansion control field is defined as follows:
0x70-access point fault is eliminated (Non_Broken message), and 0x71-service network fault is eliminated (Non_Broken message), and the 0x72-access point breaks down (Broken message), 0x73-service network break down (Broken message);
(3), use signal label byte to realize the Link State Pass Through function among the SDH
Be concrete definition below to signal label:
The 0x70-network failure is eliminated (Non_Broken message), 0x72-network break down (Broken message);
Definition after the expansion:
0x70-access point fault is eliminated (Non_Broken message), and 0x71-service network fault is eliminated (Non_Broken message), and the 0x72-access point breaks down (Broken message), 0x73-5 service network break down (Broken message);
Signal label uses the C2/V5 byte in the path overhead to transmit among the SDH.
For other business of VC3/VC4 level, the C2 byte transmits normal signal label value under the normal condition.When link occurs fault, fault detect end equipment sends link failure C2 value, with the notice opposite equip. Link State of this moment.After opposite equip. is received the C2 byte of representing link failure, should not report the SLM Signal Label Mismatch alarm, but carry out the processing of Link State Pass Through function; And carry out state exchange according to the state machine of Link State Pass Through function.When fault end link-recovery, after equipment was got back to normal operating conditions, equipment resend normal C2 value.
For other business of VC1/2 level, use the V5 byte to transmit Link State Pass Through function control frame, other business of working mechanism and VC3/VC4 level is consistent.It should be noted that: 5～7bit of V5 byte transmits normal signal label under the normal condition.Owing to added the Link State Pass Through function, need expansion to use the V5 byte.According to standard, when expansion was used, 5～7bit of V5 byte filled in 101, and the signal label of expansion is filled up to the bit1 of K4 byte, and the bit1 of 32 frame K4 constitutes a 32bit bit string, used 12～19bit to transmit the spread signal label.
1. the link break-through under the access point fault mode
Fig. 3 is according to the Link State Pass Through procedure chart under the described mode standard of the embodiment of the invention, and as shown in Figure 3, its processing procedure is as follows:
In the t0 moment, user 1 is broken down with service equipment A linked link.This moment, service equipment A sent continuous Broken primitive to the service equipment B of opposite end, told service equipment B the fault of local terminal, and primitive uses the control frame form.
In the t1 moment, service equipment B receives the Broken primitive of linkage fault; After treatment, know that link failure has appearred in service equipment A place, so disconnect and the linking of user 2; The link linking status between service equipment B and the user 2 has been arrived in the link linking status break-through of user 1 and service equipment A.This moment, user 1 and user 2 can use backup network to communicate.
In the t2 moment, the link between user 1 and service equipment A is restored; This moment, service equipment A sent Non_Broken primitive to service equipment B, told equipment B local terminal link to be restored.
In the t3 moment, service equipment B receives Non_Broken primitive; After treatment, know the link failure disappearance at device A place; So on original network, set up again and the linking of user 2.
2. the Link State Pass Through under the service network fault mode
Fig. 4 is according to the Link State Pass Through procedure chart under the described mode of extension of the embodiment of the invention, and as shown in Figure 4, its processing procedure is as follows:
T0 constantly, it is unavailable that service equipment A detects service network, sends Broken primitive to the opposite end, and cut off and the linking of this end subscriber;
T1 constantly, service equipment B receives Broken primitive, so cut off and the linking of user 2; After this user 1 and user 2 use backup network to communicate; Be restored up to service network.
It should be noted that service network has the network protection function of oneself usually, has certain network protection ability.For fear of confusion, require the Link State Pass Through function to carry out and start evening, that is, only after the defencive function of having determined service network lost efficacy, restart the Link State Pass Through function.
3. the Link State Pass Through function goes to tremble processing
The Link State Pass Through function might be because during the fashion of link bad (shake) and the operational processes of mistake occurs, in order to eliminate the jitter problem of link, can adopt and tremble processing when realizing.Fig. 5 is according to the described sequential chart that goes to tremble processing of the embodiment of the invention, and as shown in Figure 5, its main process is:
Only when the lasting T0 time of link is unavailable, judge that just link breaks down; If the link failure time less than T0, keeps original Link State constant so;
Only when link continues the T0 time can the time spent, judge that just link is working properly.
4. alarm and the incident under the Link State Pass Through function
In the Link State Pass Through process, need monitor and report various situations.Fig. 6 shows alarm and the incident under the Link State Pass Through function, and as shown in Figure 6, its main contents are:
When I. service equipment detects the access point link failure, report the fault warning of local terminal access point, have only when detecting just to stop to report when the access point link failure disappears;
When II. service equipment is received the Broken control frame for the first time, report opposite end link failure incident, when receiving the Non_Broken control frame for the first time, report the opposite end link failure to eliminate incident equally;
When III. service equipment detects the service network fault, can use the original alarm of service network to report, also can use special alarm to report.
5. the state machine of Link State Pass Through function conversion
Under the Link State Pass Through function, various states is arranged,, can change between these states along with the variation of link condition.Below with reference to Fig. 7 various states and conversion thereof under the Link State Pass Through function are elaborated.Fig. 7 is that described link break-through realizes state transition diagram according to the embodiment of the invention, and as shown in Figure 7, the specific implementation process of Link State Pass Through function is made up of a state machine that comprises 4 basic status, below is 4 basic status definition of state machine:
Normal operating conditions: access point and service network all are in normal condition;
Wait-to-Restore state: after service equipment is received the Broken control frame, enter the Wait-to-Restore state;
The access point malfunction: break down in the path between user and service equipment, can not communicate by letter normally between user and service equipment;
The service network malfunction: the service network between the service equipment breaks down, and can not communicate by letter normally.
The state transition process is summarized as follows:
◆ normal operating conditions:
1) if. detecting service network, to continue the T0 time unavailable, sends the Broken control frame to opposite equip. so, and it is unavailable to tell that the opposite equip. local terminal detects service network, enters the service network malfunction then;
2) if. detecting access point network, to continue the T1 time unavailable, sends the Broken control frame to opposite equip. so, and it is unavailable to tell that the opposite equip. local terminal detects access point network, enters the access point malfunction then;
3) if. receive the Broken control frame, expression opposite end network failure, the local terminal service equipment cuts off the port that links with the user so, enters the Wait-to-Restore state then;
◆ the Wait-to-Restore state: if equipment enters this state, the Broken control frame has been received in expression.This moment, the access point network of local terminal equipment may be good, should be to the link of access point network trial property.
1) if. it is unavailable that Equipment Inspection continues T0 to service network, sends the Broken control frame to opposite equip. so, and it is unavailable to tell that the opposite equip. local terminal detects service network, enters the service network malfunction then; This step is optional;
2). every 1 time of interval T of equipment just disconnects once and the linking of user, and prevents that service equipment from not have the accident with user's disconnecting link; Link and cut off if can guarantee to enter before the Wait-to-Restore state access point of equipment and user, this step also is optional so;
3) if. equipment continues the T2 time and does not receive the Broken message, may be that the opposite end has entered normal operating conditions or Wait-to-Restore state so; Local terminal equipment should link with user's access point link and also initiatively get back to normal operating conditions at this moment, to prevent deadlock;
4) if. equipment is received the Non_Broken control frame, and expression opposite end link failure recovers, now can operate as normal; This equipment should link the access point link with the user so, enters normal operating conditions then;
5) if. equipment is received the Broken message, and the link of expression opposite equip. also is in malfunction, restarts T2 counting;
◆ the service network malfunction: equipment enters this state, and expression detects service network fault has taken place.
1). continue to check whether service network is normal, if service network still has fault, so regularly T3 sends the Broken message, tells opposite equip. service network fault (herein no matter whether opposite equip. can be received);
2). continue to check whether service network is normal, if service network continues T0 time fault-free, thinks that so service network has recovered normal; Send Non_Broken message to the opposite end this moment, and directly get back to normal operating conditions, restarts new detection.。
◆ the access point malfunction: equipment enters this state, and expression detects the local terminal access point and breaks down.Under this state, need regularly to attempt the link of recovery access point.
1). detect the state of local terminal service network, if it is unavailable to detect service network, send the Broken message so, and enter into the service network malfunction; This step is optional;
2) .T1, T4 cycle alternation; During T1 (T1 should guarantee normally to link the required time between service equipment and the user at least), equipment is attempted link access point link, successfully sends the Non_Broken control frame so to the opposite end if link, and enters normal operating conditions then; Otherwise cut off the access point link once more and enter the T4 stage; In stage, service equipment regularly T3 sends the Broken message to the opposite end, tells the opposite equip. local terminal that network failure has taken place at T4; The T4 stage finishes back equipment and reenters the T1 stage;
3) if. receive the Broken control frame, represent that so service network or opposite end access point have fault, restart the T4 stage and count;
4) if. receive the Non_Broken message, expression opposite end network recovers; This moment, local terminal equipment should enter the T1 stage immediately; Attempt recovering network linking.
Though above the explanation that the present invention did is carried out with reference to specific embodiment,, it is apparent to those skilled in the art that these explanations and do not mean that limitation of the present invention.For example, in the above-described embodiments, the Link State Pass Through technology is applied in the middle of the network configuration shown in Figure 1.But this technology is applicable to other forms of network configuration too, and Fig. 9 and Figure 10 show two kinds of network configuration forms that wherein can adopt link break-through technology of the present invention.As shown in Figure 9, first kind of network configuration is: user 1 and 2 can open the business of two ports at the service equipment place, and two ports can be that a master one is equipped with, but also do active and standby mutually.This moment, two ports can use the Link State Pass Through function.When not excessive service network broke down, user 1 still can disconnect with communicating by letter of 2 of users.As shown in figure 10, second kind of network configuration is: active link and backup link are not walked a network, are fully independently.User 1 activates the service at service equipment A0 and service device A 1 place respectively; Same user 2 activates the service on service equipment B0 and service equipment B 1.User 1 uses service network 0 to communicate by letter with user 2 under the normal condition, and user 1 used service network 1 to communicate by letter with user 2 when fault took place.Communication when this structure can guarantee that service network 0 breaks down between the user still can be carried out.Therefore, limitation of the present invention is defined by its claims, anyly can not break away from the spirit and scope of the present invention to modification of the present invention and conversion.
Claims (13)
1, a kind of method that realizes Link State Pass Through in the network is characterized in that may further comprise the steps:
The A service equipment detects whether link breaks down in the network;
B is when link breaks down in the network, and service equipment utilizes control frame that link failure information is passed to the opposite end service equipment;
The described control frame that contains link failure information that service equipment response in C opposite end receives and disconnect user link are also handled accordingly;
The user of D fault end and the user of opposite end communicate by backup network.
2, the method for Link State Pass Through in the realization network according to claim 1 is characterized in that further comprising the steps of:
E works as described link-recovery just often, and the reset terminal service equipment sends the control frame that contains link failure recovery information to the opposite end service equipment, again in the communication of setting up on the described link between the described user.
3, the method for Link State Pass Through in the realization network according to claim 1 is characterized in that comprising network state information in the described control frame at least, is used to show link failure whether occurs.
4, the method for Link State Pass Through in the realization network according to claim 3 is characterized in that described control frame is a standard ethernet frame, and described network state information is inserted in the opcode field of described ethernet frame.
5, the method for Link State Pass Through in the realization network according to claim 3 is characterized in that described control frame is the tunneling control frame, and described network state information is inserted in the control field of described tunneling control frame.
6, the method for Link State Pass Through in the realization network according to claim 3 is characterized in that described control frame is a signal label byte, and described network state information is inserted in the described signal label byte.
7, according to the method for Link State Pass Through in the described realization network of arbitrary claim in the claim 1,2 or 3, it is characterized in that steps A is further comprising the steps of:
Only when link is lasting unavailable in the given time, judge that just link breaks down;
But only, judge that just link-recovery is normal when the lasting in the given time time spent of link.
8, the method for Link State Pass Through in the realization network according to claim 7 is characterized in that:
If described link failure is the access point fault, then the service equipment of fault end will send to the opposite end service equipment and contain the break down described control frame of information of access point, contain access point and break down behind the described control frame of information receiving, described opposite end service equipment will disconnect with to being connected of end subscriber, then the user of fault end with end subscriber is communicated by backup network;
If described link failure is the service network fault, then the service equipment of fault end will send to the opposite end service equipment and contain the break down described control frame of information of service network, and disconnection links with the fault end subscriber, contain service network and break down behind the described control frame of information receiving, described opposite end service equipment will disconnect with to being connected of end subscriber, then the user of fault end with end subscriber is communicated by backup network.
9, the method for Link State Pass Through in the realization network according to claim 8; it is characterized in that; at link failure is under the situation of service network fault, only after the defencive function of having determined described service network self lost efficacy, carries out and the corresponding treatment step of service network fault again.
10, the method for realization Link State Pass Through according to claim 8 is characterized in that, also comprises the following steps of regularly attempting recovering the access point link when link failure is the access point fault:
In the first predetermined period stage, service equipment attempts recovering the access point link, if link successfully control frame that then transmission contains link failure recovery information to the opposite end service equipment, enter normal operating conditions then, otherwise disconnection access point link entered for the second predetermined period stage;
In the second predetermined period stage, service equipment regularly sends to the opposite end service equipment and contains the break down control frame of information of link, enters for the first predetermined period stage then.
11, the method for Link State Pass Through in the realization network according to claim 1 is characterized in that step B is further comprising the steps of:
When service equipment detects the access point link failure, report the fault warning of local terminal access point, stop to report when the access point link failure disappears when detecting;
When service equipment detects the service network fault, use original alarm of service network or special alarm report service network fault warning.
12, the method for Link State Pass Through in the realization network according to claim 1 is characterized in that step C is further comprising the steps of:
When service equipment receives that containing link breaks down the control frame of information, report opposite end link failure incident,, then enter the Wait-to-Restore state if local terminal access point link is normal, if local terminal access point link failure, then regularly send and contain the break down control frame of information of link to the opposite end service equipment;
When service equipment is received the control frame that contains link failure recovery information, report the opposite end link failure to eliminate incident,, then enter normal operating conditions, if local terminal access point link failure then attempts recovering the access point link if local terminal access point link is normal.
13, the method for Link State Pass Through in the realization network according to claim 12, it is characterized in that: be in the service equipment of Wait-to-Restore state if continuing not receive in the given time contains the break down control frame of information of link, then recover also initiatively to get back to normal operating conditions with user's access point link.
Priority Applications (11)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021525315A CN1319320C (en) | 2002-10-22 | 2002-11-21 | Method for realizing link state feed-through in network |
| DE60322096T DE60322096D1 (en) | 2002-11-21 | 2003-08-13 | Method for signaling a connection error in a network |
| AT03811325T ATE400939T1 (en) | 2002-11-21 | 2003-08-13 | METHOD FOR SIGNALING A CONNECTION ERROR IN A NETWORK |
| BR0316505-1A BR0316505A (en) | 2002-11-21 | 2003-08-13 | Method for implementing link state that passes through the network |
| CA2506914A CA2506914C (en) | 2002-11-21 | 2003-08-13 | A method of achieving the network link status passing-through in network |
| AU2003261567A AU2003261567A1 (en) | 2002-11-21 | 2003-08-13 | A method of achieving the network link status penetrate |
| PCT/CN2003/000668 WO2004047366A1 (en) | 2002-11-21 | 2003-08-13 | A method of achieving the network link status penetrate |
| EP03811325A EP1568171B1 (en) | 2002-11-21 | 2003-08-13 | Method for signaling a link fault in a network |
| RU2005119311/09A RU2304849C2 (en) | 2002-11-21 | 2003-08-13 | Method affording transmission of information about communication line condition in network |
| US10/535,858 US7660240B2 (en) | 2002-11-21 | 2003-08-13 | Method of achieving the network link status penetrate |
| ES03811325T ES2309393T3 (en) | 2002-11-21 | 2003-08-13 | METHOD TO SIGN A LINK FAILURE IN A NETWORK. |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02145670 | 2002-10-22 | ||
| CN02145670.4 | 2002-10-22 | ||
| CNB021525315A CN1319320C (en) | 2002-10-22 | 2002-11-21 | Method for realizing link state feed-through in network |
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| CN1492623A CN1492623A (en) | 2004-04-28 |
| CN1319320C true CN1319320C (en) | 2007-05-30 |
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| CNB021525315A Expired - Lifetime CN1319320C (en) | 2002-10-22 | 2002-11-21 | Method for realizing link state feed-through in network |
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| WO2009082923A1 (en) * | 2007-12-14 | 2009-07-09 | Huawei Technologies Co., Ltd. | Link fault processing method and data forwarding device |
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| WO2006116896A1 (en) * | 2005-04-30 | 2006-11-09 | Zte Corporation | Rapid restoration method for ason |
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