CN102546304B - BFD detection method, equipment and system - Google Patents
BFD detection method, equipment and system Download PDFInfo
- Publication number
- CN102546304B CN102546304B CN201210018154.4A CN201210018154A CN102546304B CN 102546304 B CN102546304 B CN 102546304B CN 201210018154 A CN201210018154 A CN 201210018154A CN 102546304 B CN102546304 B CN 102546304B
- Authority
- CN
- China
- Prior art keywords
- bfd
- opposite equip
- message
- response messages
- described opposite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Communication Control (AREA)
- Small-Scale Networks (AREA)
Abstract
The embodiment of the invention discloses BFD (Bidirectional Forwarding Detection) detection method, equipment and system. In the embodiment, a poll request message is sent to terminal equipment before setting of a BFD session, so as to determine whether the terminal equipment can be reached or not according to whether a poll response message returned by the terminal equipment can be received or not within a set period of time, and if the terminal equipment can be reached, whether the BFD detection capability is effective is further judged according to the BFD configuration state to the terminal equipment, which is carried in the poll response message, so that BFD failures can be perceived promptly and the failure cause can be accurately positioned.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of method, apparatus and system detecting two-way converting detection (BFD, Bidirectional Forwarding Detection).
Background technology
Two-way converting detects (BFD, Bidirectional Forwarding Detection) be a kind of forward-path be used between fast detecting a pair forwarding engine whether can detection technique, it provides the failure detection mechanism of a kind of low expense and short sense cycle between two adjacent systems, mainly comprises the detection of the detection of interface, the detection of data link and forwarding engine self.
Agreement that BFD is similar to " Hello " (" hello " agreement), after needing the BFD session establishment between two systems detected, both sides periodically can send BFD to the other side and control message, simultaneously also on the link enabling BFD function, the BFD periodically detecting the other side controls the arrival situation of message, if the BFD do not received in certain intervals from opposite equip. controls message, then think this link failure, thus reach the object that link failure finds fast.
To in the research and practice process of prior art, the present inventor finds, due to all factors, such as there is no enable BFD function or do not configure BFD to detect, or configuration parameter mistake or BFD configuration are in and hang up (admindown) state, or link error etc. reason, may cause carrying out BFD consulting session, thus cause BFD session to set up, there is not the scheme that this type of fault is positioned in prior art.
Summary of the invention
The embodiment of the present invention provides a kind of method, apparatus and system detecting BFD, can perception BFD fault in time.
Detect the method that two-way converting detects, comprising:
PollingRequest message be sent to opposite equip. before setting up BFD session;
Determine whether to receive in setting-up time the poll response messages that described opposite equip. returns, described poll response messages carries the BFD configuration state information of described opposite equip.;
If so, then determine that described opposite equip. can reach, according to the detectability of the BFD of the BFD configuration state information determination opposite equip. of described opposite equip.;
If not, then determine that opposite equip. is unreachable.
Detect the method that two-way converting detects, comprising:
Before setting up BFD session, receive the PollingRequest message that opposite equip. sends;
Return poll response messages to described opposite equip., described poll response messages carries the BFD configuration state information of local device, so that when described opposite equip. determines that described local device can reach according to poll response messages, determine the detectability of the BFD of described local device according to the BFD configuration state information of described local device.
A kind of detection requesting service, comprising:
Request unit, for sending PollingRequest message to opposite equip. before setting up BFD session;
Determining unit, for determining whether to receive in setting-up time the poll response messages that described opposite equip. returns, described poll response messages carries the BFD configuration state information of opposite equip.;
Processing unit, during for determining to receive poll response messages in determining unit, determines that described opposite equip. can reach, according to the detectability of the BFD of the BFD configuration state information determination opposite equip. of described opposite equip.; When determining unit is determined not receive poll response messages, determine that described opposite equip. is unreachable.
A kind of detection response apparatus, comprising:
Receiving element, for before setting up BFD session, receives the PollingRequest message that opposite equip. sends;
Response unit, for returning poll response messages to described opposite equip., described poll response messages carries the BFD configuration state information of local device, so that when described opposite equip. determines that described local device can reach according to poll response messages, determine the detectability of the BFD of described local device according to the BFD configuration state information of described local device.
A kind of communication system, any one detection requesting service that comprising the embodiment of the present invention provides detects response apparatus with any one.
The embodiment of the present invention adopts and sent PollingRequest message to opposite equip. before setting up BFD session, so that poll response messages that opposite equip. returns whether can be received to determine whether opposite equip. can reach in setting-up time, and when reaching, whether the BFD configuration state information according to the opposite equip. carried in poll response messages is effectively done to judge further to the detectability of BFD, makes it possible to timely perception BFD fault.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those skilled in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the flow chart of the method for the detection BFD that the embodiment of the present invention provides;
Fig. 2 is another flow chart of the method for the detection BFD that the embodiment of the present invention provides;
Fig. 3 is the another flow chart of the method for the detection BFD that the embodiment of the present invention provides;
Fig. 4 is the structural representation of the detection requesting service that the embodiment of the present invention provides;
Fig. 5 is the structural representation of the detection response apparatus that the embodiment of the present invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those skilled in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In order to be described the embodiment of the present invention better, carry out schematic illustration by the stage experienced main in BFD session life cycle and several failure situations that there will be below.
(1) the main stage experienced in BFD session life cycle;
(1) BFD session is set up;
Link AB between system a and systemb applies BFD.Because BFD does not find neighbours (neighbours automatically, i.e. opposite end, refer to the other end of BFD session, such as said system A and system B, wherein, system A and system B i.e. the neighbours of BFD session each other) mechanism, need static configuration or depend on other application protocol distributes to this BFD session conversational authentication code (Discriminator) to the IP address and the other side of knowing its neighbours, neighbours can certainly be found by Signalling exchange and the conversational authentication code of study correspondence.In embodiments of the present invention, be described premised on the IP address knowing neighbours and conversational authentication code.
After the information such as the IP address of acquisition neighbours (i.e. opposite end) and conversational authentication code, start timed sending BFD session negotiation message until BFD session establishment, its interval of giving out a contract for a project generally is greater than 1s.For convenience of description, we are called slow session negotiation phase this state.
(2) BFD defects detection;
After BFD session establishment, just send BFD according to the interval consulted to opposite end between the neighbours of this BFD session and control message, this is the same with mode of operation with the function of " Hello " protocol massages, just transmission frequency is often faster, be generally less than 1s (second), in many application scenarios, may be tens ms (millisecond).For convenience of description, we are called fast weak detection-phase this state.
System is while transmission BFD controls message, also timing detects the BFD control message that BFD neighbours send over, if the BFD losing neighbours continuously controls message reach the number of specifying, then announce that link is hung up (down), and this message announcement is applied such as routing module, forwarding module etc. to other.
(3) BFD session teardown;
For preventing opposite end from reporting detection failure by mistake, drive end needs to send admindown message to opposite end, when opposite end receives this admindown message, will stop detecting, and migration session state is down state.
(2) several failure situations often occurred and failure cause;
(1) set up session because link failure causes BFD to hold consultation, therefore BFD cannot detect.
(2) consult and successfully set up BFD session, but making its Admindown due to the active management behavior of user, cause it again to consult successfully, therefore BFD cannot detect.
(3) consult and successfully set up BFD session, but breaking down and Admindown due to opposite end BFD forwarding plane, cause again consulting successfully, therefore BFD cannot detect.
(4) consult and successfully set up BFD session, but to restart due to the system failure, then after restarting, BFD again cannot carry out detection and causes business cannot perception fault again, and namely BFD detects unsuccessfully.
From this several failure situations above, failure cause mainly can be divided into several as follows:
(1) opposite end does not have enable BFD function, causes local terminal (namely local) to receive response.
(2) opposite end is not detected BFD and is configured or configuration error, causes local terminal to receive response.
(3) the BFD configuration of opposite end is in admindown state, causes this locality to receive response.
(4) link occurs fault between local terminal and opposite end, causes this locality to receive response.
It should be noted that, " local terminal " and " opposite end " in the embodiment of the present invention is comparatively speaking, such as, if by " detection request end " as " local terminal ", so, " opposite end " refers to " detection responder ", if but " detection responder " is used as " local terminal ", " opposite end " then refers to " detection request end ".Wherein, " detection request end " refers to the one end initiatively sending PollingRequest message, and " detection responder " refers to reception PollingRequest message, and returns to one end of poll response messages.
In order to more than timely perception said BFD fault, and position the reason of BFD fault, the embodiment of the present invention provides a kind of method, apparatus and system detecting BFD.To be described in detail respectively below.
Embodiment one,
This enforcement is described from the angle detecting request end (i.e. drive end); This detection request end is specifically as follows the equipment such as router or switch.
Detect a method of BFD, comprising: before setting up BFD session, send PollingRequest message to opposite equip.; Determine whether to receive in setting-up time the poll response messages carrying the BFD configuration state information of opposite equip. that this opposite equip. returns; If receive the poll response messages carrying the BFD configuration state information of opposite equip. that this opposite equip. returns in setting-up time, then determine that opposite equip. can reach, according to the detectability of the BFD of the BFD configuration state information determination opposite equip. of this opposite equip.; If do not receive the poll response messages carrying the BFD configuration state information of opposite equip. that this opposite equip. returns in setting-up time, then determine that opposite equip. is unreachable.
See Fig. 1, idiographic flow can be as follows:
101, before setting up BFD session, poll (Poll) request message is sent to opposite equip.; Wherein, this PollingRequest message can adopt BFD to control the form of message.
It should be noted that, because the present embodiment is described from the angle detecting request end, so the opposite equip. in the present embodiment refers to detect responder equipment, local device then refers to and detects request end equipment.
102, determine whether to receive in setting-up time the poll response messages that opposite equip. returns, if receive this poll response messages, then perform step 103, if do not receive this poll response messages, then perform step 104; Wherein, the BFD configuration state information of opposite equip. is carried in this poll response messages;
So-called BFD configuration state information, refer to the information being used to indicate BFD configuration state, such as, can comprise: the information that instruction BFD is in the information of admindown state, instruction BFD is not in admindown state, instruction BFD do not configure, indicate BFD to configure the imperfect and instruction BFD configuration information such as correct.
Wherein, poll response messages can adopt BFD to control the form of message, and BFD specifically can be utilized to control diagnosis (Diag, Diagnose) field in message and state (Sta, Station) field to carry BFD configuration state information.Such as, at least one of following several situation can specifically be had:
When the BFD mode field controlled in message is set to the first value, instruction BFD is in admindown state;
When the BFD diagnosis field controlled in message is set to the second value, the BFD of instruction opposite equip. does not configure;
When the BFD diagnosis field controlled in message is set to the 3rd value, the BFD configuration of instruction opposite equip. is imperfect;
When the BFD diagnosis field controlled in message is set to the 4th value, the BFD configuration of instruction opposite equip. is correct.
It should be noted that, " the first value ", " the second value ", " the 3rd value " and " the 4th value " in the embodiment of the present invention can be a concrete numerical value, also can be several concrete numerical value.
For " the first value ", can arrange " the first value " is " 00 ", so, when the BFD mode field controlled in message is set to " 00 ", represent that BFD is in admindown state, and when the BFD mode field controlled in message is set to other values except " 00 ", then represent that BFD is not in admindown state; Or, also can arrange " the first value " is " 00 ", " 01 " and " 02 ", so, when the BFD mode field controlled in message is set to " 00 ", " 01 " or " 02 ", represent that BFD is in admindown state, and when the BFD mode field controlled in message is set to other values except " 00 ", " 01 " and " 02 ", then represent that BFD is not in admindown state; Or, can also " the first value " be other numerical value except " 00 ", namely be equivalent to arrange the BFD mode field controlled in message when being set to " 00 ", represent that BFD is not in admindown state, otherwise, when the BFD mode field controlled in message is set to other numerical value except " 00 ", represent that BFD is in admindown state; By that analogy, etc.
Arranging of " the second value ", " the 3rd value " and " the 4th value " is similar, does not repeat them here.
In addition, also it should be noted that, setting-up time can be arranged according to the demand of practical application, such as, specifically can be set to 3 and detect response cycle or 5 detection response cycles, etc., wherein, this detection is responded the cycle and can be preset according to the actual requirements.
If 103 receive the poll response messages that opposite equip. returns in setting-up time, then represent that the link between local device (namely referring to this detection request end equipment here) and opposite equip. is normal, and opposite equip. has enabled BFD function, so determine that opposite equip. can reach, whether effective according to the detectability of the BFD of the BFD configuration state information determination opposite equip. of the opposite equip. carried in poll response messages, such as, specifically can be as follows:
If the BFD of the BFD configuration state information instruction opposite equip. of opposite equip. does not configure or configures imperfect, or BFD is in admindown state, then determine that the detectability of the BFD of opposite equip. is invalid;
If the BFD configuration state information of opposite equip. indicates the configuration of the BFD of opposite equip. errorless and is not in admindown state, then determine that the detectability of the BFD of opposite equip. is effective.
Wherein, when receiving the poll response messages that opposite equip. returns, specifically can be received by any one mode following:
(1) in Internet protocol (IP, Internet Protocol) link, can receive by reverse path the poll response messages that opposite equip. returns.
(2) in non-IP link, such as at label switched path (LSP, Label Switched Path) in link or pseudo-line (PW, Pseudowire) link, can receive by out-band method the poll response messages that opposite equip. returns.
If 104 do not receive the poll response messages that opposite equip. returns in setting-up time, then represent that link failure between local device (namely referring to this detection request end equipment here) and opposite equip. or opposite equip. do not have enable BFD function, so determine that opposite equip. is unreachable.
Now can repair the BFD function of link failure or enable opposite equip. by reminding user, complete until link repair or enable opposite equip. BFD function after, just carry out setting up BFD session, to carry out BFD detection.
As from the foregoing, the present embodiment adopts and sent PollingRequest message to opposite equip. before setting up BFD session, so that poll response messages that opposite equip. returns whether can be received to determine whether opposite equip. can reach in setting-up time, and when reaching, whether the BFD configuration state information according to the opposite equip. carried in poll response messages is effectively done to judge further to the detectability of BFD, make it possible to timely perception BFD fault, and localizing faults reason exactly, such as failure cause is that the BFD of opposite equip. does not configure or configures imperfect, again such as, if opposite equip. is unreachable, then show that link failure or opposite equip. do not have enable BFD, etc., thus be conducive to user and for failure cause, fault repaired in time, to improve the success rate of follow-up BFD session establishment, and BFD detects and can normally carry out.
Embodiment two,
The present embodiment is described from the angle detecting responder, and this detection responder is specifically as follows the equipment such as router or switch.
Detect a method of BFD, comprising: receive the PollingRequest message that opposite equip. sends; Return poll response messages to this opposite equip., wherein, poll response messages carries the BFD configuration state information of local device.
See Fig. 2, idiographic flow can be as follows:
201, before setting up BFD session, the PollingRequest message that opposite equip. sends is received; Wherein, this PollingRequest message can adopt BFD to control the form of message.
It should be noted that, because the present embodiment is described from the angle detecting responder, so the opposite equip. in the present embodiment refers to and detects request end equipment, and local device refers to detection responder equipment.
202, poll response messages is returned to opposite equip., wherein, poll response messages carries the BFD configuration state information of local device, so that when this opposite equip. determines that this local device (namely this returns the equipment of poll response messages) can reach according to poll response messages, determine the detectability of the BFD of this local device according to the BFD configuration state information (the BFD configuration state information of namely carrying in this poll response messages) of this local device.
So-called BFD configuration state information, refer to the information being used to indicate BFD configuration state, such as, can comprise: the information that instruction BFD is in the information of admindown state, instruction BFD is not in admindown state, instruction BFD do not configure, indicate BFD to configure the imperfect and instruction BFD configuration information such as correct.
Wherein, poll response messages can adopt BFD to control the form of message, and BFD specifically can be utilized to control Diag field in message and mode field to carry BFD configuration state information.Such as, at least one of following several situation can specifically be had:
When the BFD of local device is in admindown state, the mode field controlled by BFD in message is set to the first value;
When the BFD of local device does not configure, the mode field controlled by BFD in message is set to the second value;
When the BFD configuration of local device is imperfect, the mode field controlled by BFD in message is set to the 3rd value;
When the BFD configuration of local device is correct, the mode field controlled by BFD in message is set to the 4th value.
It should be noted that, " the first value ", " the second value ", " the 3rd value " and " the 4th value " in the embodiment of the present invention can be a concrete numerical value, also can be several concrete numerical value, specifically see a kind of explanation of embodiment, can not repeat them here.
Wherein, when the poll response messages returned is to opposite equip., specifically can be returned by any one mode following:
(1) in IP link, poll response messages is returned to opposite equip. by reverse path;
(2) in non-IP link, such as in LSP link or PW link, poll response messages can be returned to opposite equip. by out-band method.
Wherein, according to the BFD configuration state information (the BFD configuration state information of namely carrying in this poll response messages) of this local device, opposite equip. determines that the method for the detectability of the BFD of this local device specifically see embodiment one, can not repeat them here.
As from the foregoing, the present embodiment adopts when receiving PollingRequest message, return poll response messages to opposite equip., and in the poll response messages returned, carry the BFD configuration state information of local device, so that according to this BFD configuration state information, opposite equip. can determine that whether the detectability of the BFD detecting responder is effective, thus can the BFD of perception in time fault, and localizing faults reason exactly, such as failure cause is that BFD does not configure or configures imperfect, etc., be conducive to user to repair fault for failure cause in time, the success rate of follow-up BFD session establishment can be improved, and BFD detect normally carry out.
Embodiment three,
According to the method described by embodiment one and two, below citing is described in further detail.
In the present embodiment, will using device A as detection request end (namely as detect requesting service), equipment B as detection responder (i.e. conduct detection response apparatus) for example is described.
See Fig. 3, the method idiographic flow detecting BFD can be as follows:
301, before setting up BFD session, device A sends poll (Poll) request message to equipment B, if link is normal, then equipment B can receive this poll (Poll) request message, namely performs step 302; If link failure, then equipment B cannot receive this poll (Poll) request message, namely directly performs step 304;
Wherein, this PollingRequest message can adopt BFD to control the form of message.
302, after equipment B receives this PollingRequest message, if equipment B enables BFD function, then perform step 303, if equipment B does not have enable BFD function, then can not respond, so directly perform step 304;
303, equipment B returns poll response messages to device A according to the BFD configuration state of self, and in poll response messages the BFD configuration state information of Portable device B, then perform step 304;
Wherein, poll response messages can adopt BFD to control the form of message, and BFD specifically can be utilized to control Diag field in message and mode field to carry BFD configuration state information.Such as, specifically can be as follows:
(1) if the BFD of equipment B is in admindown state, then by BFD, the mode field controlled in message is set to " 11 ".
(2) if although the BFD of equipment B is not in admindown state, but the BFD of equipment B does not configure, then by BFD, the mode field controlled in message is set to " 00 ", diagnosis field added word saves and is set to " 0x1F (31) ", to indicate that the BFD of equipment B does not configure.
(3) if although the BFD of equipment B is not in admindown state, but the BFD of equipment B configures imperfect, then by BFD, the mode field controlled in message is set to " 00 ", diagnosis field added word saves and is set to " 0x1F (30) ", imperfect to indicate the BFD configuration of equipment B.
(4) if the BFD of equipment B is not in admindown state, and the BFD of equipment B configures correct, then by BFD, the mode field controlled in message is set to " 00 ", and diagnosis field added word saves and is set to " 0x1F (00) ", correct to indicate the BFD configuration of equipment B.
It should be noted that, the occurrence of above-mentioned mode field and diagnosis field can be arranged according to preset strategy, and above each value is only example, should be understood that, can also be set to other values, not repeat them here.
In addition, also it should be noted that, for IP link, can receive by reverse path the poll response messages that opposite equip. returns.And for non-IP link, such as LSP link and PW link, then can receive by out-band method the poll response messages that opposite equip. returns.
304, device A determines whether to receive in setting-up time the poll response messages that equipment B returns, if receive the poll response messages that equipment B returns in setting-up time, then the link of indication equipment A arrival equipment B is normal, and equipment B enables BFD function, so determine that equipment B can reach, perform step 305; Otherwise if do not receive the poll response messages that equipment B returns in setting-up time, then indication equipment A arrives the link failure of equipment B, or equipment B enables BFD function, so determine that equipment B is unreachable, perform step 306;
Wherein, setting-up time can be arranged according to the demand of practical application, such as, specifically can be set to 3 and detect response cycle or 5 detection response cycles, etc., wherein, this detection is responded the cycle and can be preset according to the actual requirements.
305, whether device A is effective according to the detectability of the BFD of the BFD configuration state information determination equipment B of the opposite equip. carried in poll response messages, such as, and specifically can be as follows:
(1) if the mode field that BFD controls in message is set to " 11 ", then the BFD of indication equipment B is in admindown state, so device A reporting fault reason, shows that the BFD of equipment B is in admindown state, causes BFD to detect and loses efficacy.
(2) if the mode field that BFD controls in message is set to " 00 ", in diagnosis field, newly-increased byte is " 0x1F (31) ", then the BFD of indication equipment B does not configure, so device A reporting fault reason, show that the BFD of equipment B does not configure, cause BFD to detect and lost efficacy.
(3) if the mode field that BFD controls in message is set to " 00 ", in diagnosis field, newly-increased byte is " 0x1F (30) ", then the BFD configuration of indication equipment B is imperfect, so device A reporting fault reason, show that the BFD configuration of equipment B is imperfect, cause BFD to detect and lost efficacy.
(4) if the mode field that BFD controls in message is set to " 00 ", in diagnosis field, newly-increased byte is " 0x1F (00) ", then the BFD configuration of indication equipment B is correct, can carry out follow-up BFD and detect.
306, device A reporting fault reason, indicates that equipment B is unreachable, causes BFD to detect and loses efficacy.
It should be noted that, equipment B also can adopt the BFD of aforesaid way to device A to detect, and does not repeat them here.
As from the foregoing, the present embodiment adopted before setting up BFD session, PollingRequest message is sent to equipment B by device A, so that poll response messages that equipment B returns whether can be received to determine whether equipment B can reach in setting-up time, and when reaching, whether the BFD configuration state information according to the equipment B of carrying in poll response messages is effectively done to judge further to the detectability of the BFD of equipment B, make it possible to timely perception BFD fault, and localizing faults reason exactly, such as failure cause is that the BFD of equipment B does not configure or configures imperfect, again such as, if equipment B is unreachable, then show that link failure or equipment B do not have enable BFD, etc., thus be conducive to user and for failure cause, fault repaired in time, to improve the success rate of follow-up BFD session establishment, and BFD detects and can normally carry out.
Embodiment four,
In order to implement above method better, the embodiment of the present invention also provides a kind of and detects requesting service, and as detection request end, as shown in Figure 4, this detection requesting service comprises request unit 401, determining unit 402 and processing unit 403;
Request unit 401, for sending PollingRequest message to opposite equip. before setting up BFD session;
Determining unit 402, for determining whether to receive in setting-up time the poll response messages that opposite equip. returns, wherein, poll response messages carries the BFD configuration state information of opposite equip.;
So-called BFD configuration state information, refer to the information being used to indicate BFD configuration state, such as, can comprise: the information that instruction BFD is in the information of admindown state, instruction BFD is not in admindown state, instruction BFD do not configure, indicate BFD to configure the imperfect and instruction BFD configuration information such as correct.
Processing unit 403, for when determining unit 402 is determined to receive poll response messages, determines that opposite equip. can reach, according to the detectability of the BFD of the BFD configuration state information determination opposite equip. of opposite equip.; When determining unit 402 is determined not receive poll response messages, determine that opposite equip. is unreachable.
Wherein, when receiving the poll response messages that opposite equip. returns, specifically can be received by any one mode following:
(1) in IP link, can receive by reverse path the poll response messages that opposite equip. returns.
(2) in non-IP link, such as in LSP link or PW link, can receive by out-band method the poll response messages that opposite equip. returns.
Wherein, PollingRequest message and poll response messages specifically can adopt BFD to control the form of message, that is:
Request unit 401, for sending PollingRequest message to opposite equip. before setting up BFD session, wherein, PollingRequest message can adopt BFD to control the form of message;
Determining unit 402, for determining whether to receive in setting-up time the poll response messages that opposite equip. returns, wherein, poll response messages can adopt BFD to control the form of message, utilizes BFD to control diagnosis field in message and mode field to carry BFD configuration state information.Such as, at least one of following situation can specifically be had:
When the BFD mode field controlled in message is set to the first value, instruction BFD is in admindown state;
When the BFD diagnosis field controlled in message is set to the second value, the BFD of instruction opposite equip. does not configure;
When the BFD diagnosis field controlled in message is set to the 3rd value, the BFD configuration of instruction opposite equip. is imperfect;
When the BFD diagnosis field controlled in message is set to the 4th value, the BFD configuration of instruction opposite equip. is correct.
Wherein, setting-up time can be arranged according to the demand of practical application, such as, specifically can be set to 3 and detect response cycle or 5 detection response cycles, etc., wherein, this detection is responded the cycle and can be preset according to the actual requirements.
Processing unit 403, the BFD specifically for the BFD configuration state information instruction opposite equip. at opposite equip. does not configure or configures imperfect, or when BFD is in admindown state, determines that the detectability of the BFD of opposite equip. is invalid; Indicate the configuration of the BFD of opposite equip. errorless in the BFD configuration state information of opposite equip. and when not being in admindown state, determine that the detectability of the BFD of opposite equip. is effective.
This detection requesting service is specifically as follows the equipment such as router or switch.
During concrete enforcement, above unit realizes respectively as an entity, also can carry out combination in any, is realized by same or several entities, and the concrete enforcement of above unit see preceding embodiment, can not repeat them here.
As from the foregoing, the detection requesting service of the present embodiment adopts and sent PollingRequest message to opposite equip. by request unit 401 before setting up BFD session, then determine whether opposite equip. can reach by determining unit 402 according to the poll response messages that opposite equip. returns whether can be received in setting-up time, and when reaching, whether effectively done to judge further to the detectability of BFD according to the BFD configuration state information of the opposite equip. carried in poll response messages by processing unit 403, make it possible to timely perception BFD fault, and localizing faults reason exactly, such as failure cause is that the BFD of opposite equip. does not configure or configures imperfect, again such as, if opposite equip. is unreachable, then show that link failure or opposite equip. do not have enable BFD, etc., thus be conducive to user and for failure cause, fault repaired in time, to improve the success rate of follow-up BFD session establishment, and BFD detects and can normally carry out.
Embodiment five,
Accordingly, the embodiment of the present invention also provides a kind of and detects response apparatus, and as detection responder, as shown in Figure 5, this detection response apparatus comprises receiving element 501 and response unit 502;
Receiving element 501, for before setting up BFD session, receives the PollingRequest message that opposite equip. sends;
It should be noted that, because the present embodiment is described from the angle detecting responder, so the opposite equip. in the present embodiment refers to and detects request end equipment, and local device refers to detection responder equipment.
Response unit 502, for returning poll response messages to opposite equip., wherein, poll response messages carries the BFD configuration state information of local device, so that when this opposite equip. determines that this local device (namely this returns the equipment of poll response messages) can reach according to poll response messages, determine the detectability of the BFD of this local device according to the BFD configuration state information (the BFD configuration state information of namely carrying in this poll response messages) of this local device.
So-called BFD configuration state information, refer to the information being used to indicate BFD configuration state, such as, can comprise: the information that instruction BFD is in the information of admindown state, instruction BFD is not in admindown state, instruction BFD do not configure, indicate BFD to configure the imperfect and instruction BFD configuration information such as correct.
Wherein, poll response messages can adopt BFD to control the form of message, and BFD specifically can be utilized to control Diag field in message and mode field to carry BFD configuration state information; That is:
Response unit 502, specifically for returning poll response messages to opposite equip., wherein, poll response messages adopts BFD to control the form of message, utilizes BFD to control diagnosis field in message and mode field to carry BFD configuration state information.
Such as, at least one of following situation can specifically be had:
When the BFD of local device is in admindown state, the mode field controlled by BFD in message is set to the first value;
When the BFD of local device does not configure, the mode field controlled by BFD in message is set to the second value;
When the BFD configuration of local device is imperfect, the mode field controlled by BFD in message is set to the 3rd value;
When the BFD configuration of local device is correct, the mode field controlled by BFD in message is set to the 4th value.
Wherein, when the poll response messages returned, specifically can return poll response messages to opposite equip. by the mode outside reverse path or band.That is:
Response unit 502, specifically in internetwork protocol chain circuit, returns poll response messages to opposite equip. by reverse path; In non-internetwork protocol chain circuit, return poll response messages to opposite equip. by out-band method.
This detection response apparatus is specifically as follows the equipment such as router or switch.
During concrete enforcement, above unit realizes respectively as an entity, also can carry out combination in any, is realized by same or several entities, and the concrete enforcement of above unit see preceding embodiment, can not repeat them here.
Wherein, according to the BFD configuration state information (the BFD configuration state information of namely carrying in this poll response messages) of this local device, opposite equip. determines that the method for the detectability of the BFD of this local device specifically see embodiment one, can not repeat them here.
As from the foregoing, the receiving element 501 of the detection response apparatus of the present embodiment is when receiving PollingRequest message, poll response messages is returned to opposite equip. by response unit 502, and in the poll response messages returned, carry the BFD configuration state information of local device, so that according to this BFD configuration state information, opposite equip. can determine that whether the detectability of the BFD detecting responder is effective, thus can the BFD of perception in time fault, and localizing faults reason exactly, such as failure cause is that BFD does not configure or configures imperfect, etc., be conducive to user to repair fault for failure cause in time, can ensure that follow-up BFD session can successfully be set up, and BFD detect normally carry out.
Embodiment six,
Accordingly, the embodiment of the present invention also provides a kind of communication system, also can be called detection system, and any one detection requesting service that comprising the embodiment of the present invention provides detects response apparatus with any one, namely specifically can be as follows:
Detecting requesting service, for sending PollingRequest message to detection response apparatus before setting up BFD session, determining in setting-up time, whether receive the poll response messages detecting response apparatus and return; If so, then determine that detecting response apparatus can reach, and determines the detectability of the BFD detecting response apparatus according to the BFD configuration state information detecting response apparatus; If not, then determine to detect response apparatus unreachable.
Detect response apparatus, for before setting up BFD session, receive the PollingRequest message detecting requesting service and send; Return poll response messages to detecting requesting service, wherein, poll response messages carries the BFD configuration state information of local device.
So-called BFD configuration state information, refer to the information being used to indicate BFD configuration state, such as, can comprise: the information that instruction BFD is in the information of admindown state, instruction BFD is not in admindown state, instruction BFD do not configure, indicate BFD to configure the imperfect and instruction BFD configuration information such as correct.
Wherein, poll response messages can adopt BFD to control the form of message, and BFD specifically can be utilized to control Diag field in message and Sta field to carry BFD configuration state information.Such as, at least one of following situation can specifically be had:
When the BFD of local device is in admindown state, the mode field controlled by BFD in message is set to the first value;
When the BFD of local device does not configure, the mode field controlled by BFD in message is set to the second value;
When the BFD configuration of local device is imperfect, the mode field controlled by BFD in message is set to the 3rd value;
When the BFD configuration of local device is correct, the mode field controlled by BFD in message is set to the 4th value.
Wherein, when the poll response messages returned gives detection requesting service, specifically poll response messages can be returned to detecting requesting service by reverse path, also poll response messages can be returned to detecting requesting service by out-band method.
The concrete enforcement of each equipment see preceding embodiment, can not repeat them here above.
Below citing is carried out schematic illustration to the execution flow process that this communication system detects BFD, as follows:
Step 1, before setting up BFD session, detect requesting service and send poll (Poll) request message to detecting response apparatus, if link is normal, then detects response apparatus and can receive this poll (Poll) request message, namely perform step 2; If link failure, then detect response apparatus and cannot receive this poll (Poll) request message, namely directly perform step 4;
Wherein, this PollingRequest message can adopt BFD to control the form of message.
After step 2, detection response apparatus receive this PollingRequest message, if detect response apparatus to enable BFD function, then perform step 3, if detect response apparatus there is no enable BFD function, then can not respond, so directly perform step 4;
Step 3, detection response apparatus return poll response messages to detecting requesting service according to the BFD configuration state of self, and in poll response messages, carry the BFD configuration state information of this detection response apparatus, then perform step 304;
Wherein, poll response messages can adopt BFD to control the form of message, and BFD specifically can be utilized to control Diag field in message and mode field to carry BFD configuration state information.Such as, at least one of following situation can specifically be had:
(1) if the BFD detecting response apparatus is in admindown state, then by BFD, the mode field controlled in message is set to " 11 ".
(2) if although the BFD detecting response apparatus is not in admindown state, but the BFD detecting response apparatus does not configure, then by BFD, the mode field controlled in message is set to " 00 ", diagnosis field added word saves and is set to " 0x1F (31) ", to indicate that the BFD detecting response apparatus does not configure.
(3) if although the BFD detecting response apparatus is not in admindown state, but the BFD configuration detecting response apparatus is imperfect, then by BFD, the mode field controlled in message is set to " 00 ", diagnosis field added word saves and is set to " 0x1F (30) ", imperfect to indicate the BFD configuration detecting response apparatus.
(4) if the BFD detecting response apparatus is not in admindown state, and the BFD configuration detecting response apparatus is correct, then by BFD, the mode field controlled in message is set to " 00 ", diagnosis field added word saves and is set to " 0x1F (00) ", correct to indicate the BFD configuration detecting response apparatus.
It should be noted that, the occurrence of above-mentioned mode field and diagnosis field can be arranged according to preset strategy, and above each value is only example, should be understood that, can also be set to other values, not repeat them here.
In addition, also it should be noted that, for IP link, can receive by reverse path the poll response messages that opposite equip. returns.And for non-IP link, such as LSP link and PW link, then can receive by out-band method the poll response messages that opposite equip. returns.
Step 4, detection requesting service determine in setting-up time, whether receive the poll response messages detecting response apparatus and return, if receive the poll response messages detecting response apparatus and return in setting-up time, then represent that the link detecting requesting service arrival detection response apparatus is normal, and detection response apparatus enables BFD function, so determine that detecting response apparatus can reach, and performs step 5; Otherwise, detect the poll response messages that returns of response apparatus if do not received in setting-up time, then represent that detecting requesting service arrives the link failure detecting response apparatus, or detect response apparatus and enable BFD function, so it is unreachable to determine to detect response apparatus, perform step 6;
Wherein, setting-up time can be arranged according to the demand of practical application, such as, specifically can be set to 3 and detect response cycle or 5 detection response cycles, etc., wherein, this detection is responded the cycle and can be preset according to the actual requirements.
Step 5, detection requesting service determine that according to the BFD configuration state information of the opposite equip. carried in poll response messages whether the detectability of the BFD detecting response apparatus is effective, such as, and specifically can be as follows:
(1) if the mode field that BFD controls in message is set to " 11 ", then represent that the BFD detecting response apparatus is in admindown state, so detect requesting service reporting fault reason, show that the BFD detecting response apparatus is in admindown state, cause BFD to detect and lost efficacy.
(2) if the mode field that BFD controls in message is set to " 00 ", in diagnosis field, newly-increased byte is " 0x1F (31) ", then represent that the BFD detecting response apparatus does not configure, so detect requesting service reporting fault reason, show that the BFD detecting response apparatus does not configure, cause BFD to detect and lost efficacy.
(3) if the mode field that BFD controls in message is set to " 00 ", in diagnosis field, newly-increased byte is " 0x1F (30) ", then represent that the BFD configuration detecting response apparatus is imperfect, so detect requesting service reporting fault reason, show that the BFD configuration detecting response apparatus is imperfect, cause BFD to detect and lost efficacy.
(4) if the mode field that BFD controls in message is set to " 00 ", in diagnosis field, newly-increased byte is " 0x1F (00) ", then represent that the BFD configuration detecting response apparatus is correct, can carry out follow-up BFD and detect.
Step 6, detection requesting service reporting fault reason, indicate that detection response apparatus is unreachable, cause BFD to detect and lost efficacy.
It should be noted that, detect response apparatus and aforesaid way also can be adopted to detect the BFD detecting requesting service, do not repeat them here.
As from the foregoing, the detection requesting service of the communication system of the present embodiment adopts and before setting up BFD session, sends PollingRequest message to detection response apparatus, the poll response messages returned whether can receive detection response apparatus in setting-up time determines whether detect response apparatus can reach, and when reaching, whether the BFD configuration state information according to the detection response apparatus carried in poll response messages is effectively done to judge further to the detectability of BFD, make it possible to timely perception BFD fault, and localizing faults reason exactly, such as failure cause is that BFD does not configure or configures imperfect, again such as, if it is unreachable to detect response apparatus, then show link failure or detect response apparatus there is no enable BFD, etc., thus be conducive to user and for failure cause, fault repaired in time, to improve the success rate of follow-up BFD session establishment, and BFD detects and can normally carry out.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is that the hardware that can carry out instruction relevant by program has come, this program can be stored in a computer-readable recording medium, storage medium can comprise: read-only memory (ROM, Read Only Memory), random access memory (RAM, Random Access Memory), disk or CD etc.
Above the method, apparatus and system of a kind of BFD of detection that the embodiment of the present invention provides are described in detail, apply specific case herein to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for those skilled in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (17)
1. detect the method that two-way converting detects, it is characterized in that, comprising:
PollingRequest message was sent to opposite equip. before setting up two-way converting detection BFD session;
Determine whether to receive in setting-up time the poll response messages that described opposite equip. returns, described poll response messages carries the BFD configuration state information of described opposite equip.;
If receive the poll response messages that described opposite equip. returns, then determine that described opposite equip. can reach, determine the detectability of the BFD of described opposite equip. according to the BFD configuration state information of described opposite equip.;
If do not receive the poll response messages that described opposite equip. returns, then determine that described opposite equip. is unreachable;
The described BFD configuration state information according to described opposite equip. determines the detectability of the BFD of described opposite equip., comprising:
If the BFD of the BFD configuration state information instruction opposite equip. of described opposite equip. does not configure or configures imperfect, or BFD is in and hangs up admindown state, then determine that the detectability of the BFD of described opposite equip. is invalid;
If the BFD configuration state information of described opposite equip. indicates the configuration of the BFD of opposite equip. errorless and is not in admindown state, then determine that the detectability of the BFD of described opposite equip. is effective.
2. method according to claim 1, is characterized in that,
Described PollingRequest message adopts BFD to control the form of message.
3. method according to any one of claim 1 to 2, is characterized in that,
Described poll response messages adopts BFD to control the form of message, utilizes BFD to control diagnosis field in message and mode field to carry BFD configuration state information.
4. method according to claim 3, is characterized in that, the diagnosis field in the described BFD of utilization control message and mode field, to carry BFD configuration state information, comprise following at least one:
When the BFD mode field controlled in message is set to the first value, instruction BFD is in admindown state;
When the BFD diagnosis field controlled in message is set to the second value, the BFD of described opposite equip. is indicated not configure;
When the BFD diagnosis field controlled in message is set to the 3rd value, the BFD of described opposite equip. is indicated to configure imperfect;
When the BFD diagnosis field controlled in message is set to the 4th value, indicate the BFD configuration of described opposite equip. correct.
5. method according to any one of claim 1 to 4, is characterized in that, receives the poll response messages that described opposite equip. returns and comprises:
In internetwork protocol chain circuit, receive by reverse path the poll response messages that described opposite equip. returns;
In non-internetwork protocol chain circuit, receive by out-band method the poll response messages that described opposite equip. returns.
6. detect the method that two-way converting detects, it is characterized in that, comprising:
Before setting up two-way converting detection BFD session, receive the PollingRequest message that opposite equip. sends;
Return poll response messages to described opposite equip., described poll response messages carries the BFD configuration state information of local device, so that when described opposite equip. determines that described local device can reach according to poll response messages, determine the detectability of the BFD of described local device according to the BFD configuration state information of described local device;
The described BFD configuration state information according to described opposite equip. determines the detectability of the BFD of described opposite equip., comprising:
If the BFD of the BFD configuration state information instruction opposite equip. of described opposite equip. does not configure or configures imperfect, or BFD is in and hangs up admindown state, then determine that the detectability of the BFD of described opposite equip. is invalid;
If the BFD configuration state information of described opposite equip. indicates the configuration of the BFD of opposite equip. errorless and is not in admindown state, then determine that the detectability of the BFD of described opposite equip. is effective.
7. method according to claim 6, is characterized in that,
Described PollingRequest message adopts BFD to control the form of message.
8. the method according to claim 6 or 7, is characterized in that,
Described poll response messages adopts BFD to control the form of message, utilizes BFD to control diagnosis field in message and mode field to carry BFD configuration state information.
9. method according to claim 8, is characterized in that,
When the BFD of local device is in admindown state, the mode field controlled by BFD in message is set to the first value;
When the BFD of local device does not configure, the mode field controlled by BFD in message is set to the second value;
When the BFD configuration of local device is imperfect, the mode field controlled by BFD in message is set to the 3rd value;
When the BFD configuration of local device is correct, the mode field controlled by BFD in message is set to the 4th value.
10. the method according to any one of claim 6 to 9, is characterized in that, described in return poll response messages give described opposite equip. comprise:
In internetwork protocol chain circuit, return poll response messages to described opposite equip. by reverse path;
In non-internetwork protocol chain circuit, return poll response messages to described opposite equip. by out-band method.
11. 1 kinds are detected requesting service, it is characterized in that, comprising:
Request unit, for sending PollingRequest message to opposite equip. before setting up two-way converting detection BFD session;
Determining unit, for determining whether to receive in setting-up time the poll response messages that described opposite equip. returns, described poll response messages carries the BFD configuration state information of described opposite equip.;
Processing unit, during for determining to receive poll response messages in determining unit, determines that described opposite equip. can reach, according to the detectability of the BFD of the BFD configuration state information determination opposite equip. of described opposite equip.; When determining unit is determined not receive poll response messages, determine that described opposite equip. is unreachable;
Described processing unit, indicate the BFD of described opposite equip. not configure specifically for the BFD configuration state information at described opposite equip. or configure imperfect, or BFD is in when hanging up admindown state, determines that the detectability of the BFD of described opposite equip. is invalid; When the BFD configuration state information of described opposite equip. indicates the configuration of the BFD of described opposite equip. errorless and is not in admindown state, determine that the detectability of the BFD of described opposite equip. is effective.
12. detection requesting services according to claim 11, is characterized in that,
Described determining unit, for determining whether to receive in setting-up time the poll response messages that described opposite equip. returns, described poll response messages adopts BFD to control the form of message, utilizes BFD to control diagnosis field in message and mode field to carry BFD configuration state information.
13. 1 kinds are detected response apparatus, it is characterized in that, comprising:
Receiving element, for before setting up two-way converting detection BFD session, receives the PollingRequest message that opposite equip. sends;
Response unit, for returning poll response messages to described opposite equip., described poll response messages carries the BFD configuration state information of local device, so that when described opposite equip. determines that described local device can reach according to poll response messages, determine the detectability of the BFD of described local device according to the BFD configuration state information of described local device;
The described BFD configuration state information according to described opposite equip. determines the detectability of the BFD of described opposite equip., comprising:
If the BFD of the BFD configuration state information instruction opposite equip. of described opposite equip. does not configure or configures imperfect, or BFD is in and hangs up admindown state, then determine that the detectability of the BFD of described opposite equip. is invalid;
If the BFD configuration state information of described opposite equip. indicates the configuration of the BFD of opposite equip. errorless and is not in admindown state, then determine that the detectability of the BFD of described opposite equip. is effective.
14. detection response apparatus according to claim 13, is characterized in that,
Described response unit, specifically for returning poll response messages to described opposite equip., described poll response messages adopts BFD to control the form of message, utilizes BFD to control diagnosis field in message and mode field to carry BFD configuration state information.
15. detection response apparatus according to claim 14, is characterized in that,
Described response unit, specifically for when the BFD of local device is in admindown state, the mode field controlled by BFD in message is set to the first value; When the BFD of local device does not configure, the mode field controlled by BFD in message is set to the second value; When the BFD configuration of local device is imperfect, the mode field controlled by BFD in message is set to the 3rd value; When the BFD configuration of local device is correct, the mode field controlled by BFD in message is set to the 4th value.
16. detect response apparatus according to claim 13 to any one described in 15, it is characterized in that,
Described response unit, specifically in internetwork protocol chain circuit, returns poll response messages to described opposite equip. by reverse path; In non-internetwork protocol chain circuit, return poll response messages to described opposite equip. by out-band method.
17. 1 kinds of communication systems, is characterized in that, any one detection described in requesting service and claim 13 to 16 of any one comprising described in claim 11 to 12 detects response apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210018154.4A CN102546304B (en) | 2012-01-19 | 2012-01-19 | BFD detection method, equipment and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210018154.4A CN102546304B (en) | 2012-01-19 | 2012-01-19 | BFD detection method, equipment and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102546304A CN102546304A (en) | 2012-07-04 |
| CN102546304B true CN102546304B (en) | 2015-06-03 |
Family
ID=46352306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210018154.4A Active CN102546304B (en) | 2012-01-19 | 2012-01-19 | BFD detection method, equipment and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102546304B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106559280A (en) * | 2015-09-28 | 2017-04-05 | 中兴通讯股份有限公司 | Bidirectional forwarding detection (BFD) method and device |
| CN106998273A (en) * | 2016-01-26 | 2017-08-01 | 中兴通讯股份有限公司 | Link failure detection method and device |
| CN108490358B (en) * | 2018-03-15 | 2020-06-30 | 深圳前海有电物联科技有限公司 | Battery remote monitoring system and method |
| CN111614556B (en) | 2019-02-26 | 2023-05-12 | 中兴通讯股份有限公司 | BIER-based two-way forwarding detection session creation method and related equipment |
| CN113890819A (en) * | 2021-09-29 | 2022-01-04 | 杭州迪普科技股份有限公司 | Fault processing method, device and system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101420318A (en) * | 2007-10-22 | 2009-04-29 | 中兴通讯股份有限公司 | Method for detecting connection state of digital customer line and access terminal |
| CN102158371A (en) * | 2011-04-12 | 2011-08-17 | 杭州华三通信技术有限公司 | Link performance detection method and device based on BFD (Bidirectional Forwarding Detection) |
-
2012
- 2012-01-19 CN CN201210018154.4A patent/CN102546304B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101420318A (en) * | 2007-10-22 | 2009-04-29 | 中兴通讯股份有限公司 | Method for detecting connection state of digital customer line and access terminal |
| CN102158371A (en) * | 2011-04-12 | 2011-08-17 | 杭州华三通信技术有限公司 | Link performance detection method and device based on BFD (Bidirectional Forwarding Detection) |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102546304A (en) | 2012-07-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101132320B (en) | Method for detecting interface trouble and network node equipment | |
| CN107332726B (en) | Communication link detection method and device | |
| CN100558051C (en) | Two-way conversion link is carried out the method for fault detect | |
| CN102546222B (en) | Backup system and fault detection and processing method | |
| CN102546304B (en) | BFD detection method, equipment and system | |
| CN110661702B (en) | Link backup method and device and computer readable storage medium | |
| CN102281199B (en) | Route equipment, route reflector and route information processing method and system | |
| US7957330B1 (en) | Failsafe management of periodic communications during system upgrade for a network device | |
| CN101110663A (en) | Method, system and device for implementing periodic line failure processing | |
| CN104168193A (en) | Virtual router redundancy protocol fault detection method and router equipment | |
| EP2892274B1 (en) | Fault recovery method of operation and maintenance channel and network management terminal | |
| CN101697626A (en) | Communication fault detection method and system based on two-way forwarding detection protocol | |
| CN102025562A (en) | Path detection method and device | |
| CN104348659A (en) | Fault detection method and node for multi-hop network | |
| CN103036702B (en) | A kind of N+1 backup method of cross-network segment and device | |
| CN109218107A (en) | Link switch-over method, device, the network equipment and network system | |
| CN103607317A (en) | Two-layer loop detection method, two-layer loop detection device and communication system | |
| CN101826990A (en) | Method, device and system for detecting connectedness of virtual pseudo wires | |
| CN103686854A (en) | Method and device for controlling AP | |
| CN105223949A (en) | Electrical equipment and communication fault diagnosis method and device thereof | |
| CN106603261A (en) | Hot backup method, first master device, backup device and communication system | |
| CN104283711A (en) | Fault detection method based on BFD, nodes and system | |
| CN104065508A (en) | Application service health examination method, device and system | |
| CN104901834A (en) | Method and system for automatically switching between network servers | |
| US20060002306A1 (en) | Failure detection of path information corresponding to a transmission path |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |