CN104168157A - Network connectivity detection method and device - Google Patents
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- CN104168157A CN104168157A CN201410400591.1A CN201410400591A CN104168157A CN 104168157 A CN104168157 A CN 104168157A CN 201410400591 A CN201410400591 A CN 201410400591A CN 104168157 A CN104168157 A CN 104168157A
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Abstract
The embodiment of the invention discloses a network connectivity detection method and device, and relates to the technical field of communication. By means of the method and device, the function of cross-domain network connectivity detection can be achieved. The method includes the steps that routers on an LSP receive a loopback request message, wherein the loopback request message comprises cross-domain status identification which is used for identifying whether domain crossing happens or not; when the loopback request message carries service tags, a tag forwarding table is obtained; whether a next-hop service tag exists in the service tags or not is detected according to the tag forwarding table; if yes, the loopback request message is forwarded to a local domain router corresponding to the next-hop service tag; if not, whether the loopback request message is forwarded to an outer domain router or not is determined according to the cross-domain status identification, so that an end-point router on the LSP sends a first loopback response message to a start router, wherein the first loopback response message is used for determining whether the LSP is connected or not. The network connectivity detection method and device are applicable to scenes of network connectivity detection.
Description
Technical field
The present invention relates to communication technical field, relate in particular to method and device that a kind of network connectivty detects.
Background technology
Progress along with the communication technology, BGP (Border Gateway Protocol, Border Gateway Protocol)/MPLS VPN (Multi-Protocol Label Switching Virtual Private Network, MPLS VPN network) development, the business of disposing in BGP/MPLS IP VPN network tends to cross over a plurality of AS (Autonomous System, Autonomous Domain).Wherein, cross-domain VPN-Option A (virtual special network cross-domain mode option A) is the application of BGP/MPLS IP VPN network under cross-domain environment, cross-domain between two AS of take is below introduced as example, AS comprises PE (Provider Edge, service provider edge router), P (Provider, service provider's router), ASBR (Autonomous System Border Router, autonomous domain border router), wherein P is carrier network backbone router, PE and ASBR are provider edge router, the ASBR of two AS is directly connected, just can realize the cross-domain connection between two AS.
In BGP/MPLS IP VPN network, if cannot be communicated with between certain two router on LSP (Label Switched Path, label switched path), can cause the data retransmission failure on LSP.In order to confirm whether the LSP in network is communicated with, a kind of method that the MPLS of utilization LSP Ping/Traceroute detects LSP connectedness has been proposed in prior art.Wherein, MPLS LSP Ping (multi-protocol label switching (T-MPLS) label switching path Ping detection) judges accessibility, request message is started to forward from initial router by LSP, until be sent to terminal router, terminal router sends response message, and initial router receives response message judgement LSP and can reach; MPLS LSP Traceroute (multi-protocol label switching (T-MPLS) label switching path Traceroute detection) is for locating failed router, request message is started to forward from initial router by LSP, reach home router the intermediate router of process need to send response message to initial router, initial router, according to the response message receiving, is located failed router.
In the prior art, utilize MPLS LSP Ping/Traceroute can only realize the detection of connectivity between the upper router of LSP in the interior network of single domain, and the business of disposing in BGP/MPLS VPN network often needs to cross over a plurality of AS, so just need to detect the connectedness between cross-domain router, but prior art cannot realize the detection of connectivity between the upper router of LSP in the cross-domain mode lower network of VPN-Option A.
Summary of the invention
Method and device that embodiments of the invention provide a kind of network connectivty to detect, can realize cross-domain network connectivty measuring ability.
For achieving the above object, embodiments of the invention adopt following technical scheme:
On the one hand, a kind of method that the embodiment of the present invention provides network connectivty to detect, for the Border Gateway Protocol across Autonomous Domain/multi protocol label conversion VPN (virtual private network) BGP/MPLS VPN, described BGP/MPLS VPN comprises at least two Autonomous Domain AS, and described AS comprises a plurality of routers; Described BGP/MPLS VPN comprises at least one label switched path LSP, and a LSP comprises an initial router and a terminal router; Described method comprises:
Router on described LSP receives echo request message, described echo request message comprises cross-domain status indicator, whether described cross-domain status indicator forwards described echo request message to foreign lands router for the router identifying on described LSP, and the router on described LSP is positioned at different AS from described foreign lands router;
When described echo request message carries service label, obtain Label Forwarding Information Base, described service label represents that described echo request message is to send to router on described LSP by this territory router, and the router on described this territory router and described LSP is positioned at same AS;
According to described Label Forwarding Information Base, detect described service label and whether have down hop service label;
If exist, forward described echo request message to this territory router corresponding to described down hop service label;
If do not exist, according to described cross-domain status indicator, determine whether to forward described echo request message to described foreign lands router, make the terminal router on described LSP send the first back response message to initial router, described the first back response message is communicated with for determining described LSP.
On the other hand, the device that the embodiment of the present invention provides a kind of network connectivty to detect, for the Border Gateway Protocol across Autonomous Domain/multi protocol label conversion VPN (virtual private network) BGP/MPLS VPN, described BGP/MPLS VPN comprises at least two Autonomous Domain AS, and described AS comprises a plurality of routers; Described BGP/MPLS VPN comprises at least one label switched path LSP, and a LSP comprises an initial router and a terminal router; Described device comprises:
Message receiver module, be used for receiving echo request message, described echo request message comprises cross-domain status indicator, whether described cross-domain status indicator forwards described echo request message to foreign lands router for the router identifying on described LSP, and the router on described LSP is positioned at different AS from described foreign lands router;
Label Forwarding Information Base acquisition module, for obtaining Label Forwarding Information Base, described service label represents that described echo request message is to send to router on described LSP by this territory router, the router on described this territory router and described LSP is positioned at same AS;
Whether label detection module, there is down hop service label for detection of described service label;
Packet forwarding module, for when existing, this territory router corresponding to described down hop service label forwards described echo request message;
Cross-domain judge module, for when not existing, according to described cross-domain status indicator, determine whether to forward described echo request message to described foreign lands router, make the terminal router on described LSP send the first back response message to initial router, described the first back response message is communicated with for determining described LSP.
Method and device that the embodiment of the present invention provides a kind of network connectivty to detect, be applied to BGP/MPLS VPN network, can in echo request message, increase for identifying the cross-domain status indicator that whether needs cross-domain forwarding loopback request message, echo request message is forwarded by LSP, by cross-domain status indicator, judge whether to need cross-domain, when needs are cross-domain, the router of the outside Autonomous Domain of router on LSP forwards loopback request message, when not needing when cross-domain, the router on LSP is to the next router Forward-reques message in this Autonomous Domain; Make the terminal router on LSP send loopback response message to initial router, according to the content of back response message, determine the connectedness between the upper router of LSP.Compare with the prior art of detection of connectivity between the upper router of LSP in the network that can only realize in single domain, scheme provided by the invention is by increasing cross-domain status indicator, be used for identifying and whether need cross-domain forwarding loopback request message, echo request message can cross-domainly be forwarded, and make the router on LSP no matter be positioned at this Autonomous Domain or outer Autonomous Domain, can both be after receiving echo request message, to initial router, send loopback response message, initial router receives back response message, in realizing single domain in network on LSP in the detection of connectivity between router, can also realize the detection of connectivity between the upper router of LSP in the BGP/MPLS VPN network under cross-domain mode.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, to the accompanying drawing of required use in embodiment be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The configuration diagram of the BGP/MPLS VPN network under a kind of cross-domain mode that Fig. 1 provides for the embodiment of the present invention;
The flow chart of the method that a kind of network connectivty that Fig. 2 provides for the embodiment of the present invention detects;
The flow chart of a kind of implementation of the method that a kind of network connectivty that Fig. 3 provides for the embodiment of the present invention detects;
The flow chart of the another kind of implementation of the method that a kind of network connectivty that Fig. 4 provides for the embodiment of the present invention detects;
The flow chart of another implementation of the method that a kind of network connectivty that Fig. 5 provides for the embodiment of the present invention detects;
The structural representation of the device that a kind of network connectivty that Fig. 6 provides for the embodiment of the present invention detects;
The structural representation of a kind of implementation of the device that a kind of network connectivty that Fig. 7 provides for the embodiment of the present invention detects;
The structural representation of the another kind of implementation of the device that a kind of network connectivty that Fig. 8 provides for the embodiment of the present invention detects;
The structural representation of another implementation of the device that a kind of network connectivty that Fig. 9 provides for the embodiment of the present invention detects.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making all other embodiment that obtain under creative work prerequisite, belong to the scope of protection of the invention.
The technical scheme that the embodiment of the present invention provides is applied to BGP/MPLS VPN network, in embodiments of the present invention, cross-domain between two AS of take is introduced as example, as shown in Figure 1, within an AS, can comprise a plurality of routers, at this, do not limit the number of a router in AS, router in AS can be PE, P, ASBR (Autonomous System Border Router, autonomous domain border router), wherein P is carrier network backbone router, PE and ASBR are provider edge router, the ASBR of two AS is directly connected, just can realize the cross-domain connection between two AS.In the present invention, both can detect the connectedness between the upper router of LSP in single Autonomous Domain, can also detect across the connectedness between the upper router of Autonomous Domain LSP, such as: when need to by echo request message, the PE in AS1 forwards to P, P sends loopback response message to PE, and the back response message receiving by PE judges the connectedness between PE and P in AS1; When need to be by echo request message the ASBR in AS1 while forwarding to the ASBR in AS2, ASBR in AS2 sends loopback response message to the ASBR in AS1, and the back response message receiving by the ASBR in AS1 judges ASBR in AS1 and the connectedness between the ASBR in AS2.
A kind of method that the embodiment of the present invention provides network connectivty to detect, as shown in Figure 2, comprising:
101, the router on described LSP receives echo request message.
Wherein, MPLS LSP Ping is the instrument that the accessibility of LSP is detected, and MPLS LSP Traceroute is the instrument to LSP location failed router.MPLS LSP Ping and MPLS LSP Traceroute need to send loopback request message in testing process, and echo request message comprises cross-domain status indicator, and cross-domain status indicator can be digital or other have the character of identification function.The initial value of cross-domain status indicator can be set as a desired value according to the size of BGP/MPLS VPN network and Autonomous Domain number, and this desired value is more than or equal to actual cross-domain number; Also can be set as a default value, this default value is the maximum of crossing over Autonomous Domain number in the echo request message repeating process that can carry of network.When echo request message repeating is to terminal during router, even if cross-domain status indicator is not 0, also stop forwarding loopback request message.When cross-domain status indicator is numeral, for example, cross-domain status indicator can be 0,1,2,3,4 etc., wherein 0 represents not need cross-domain forwarding loopback request message, when non-zero, represents to need cross-domain forwarding loopback request message, 1 represents the cross-domain forwarding loopback request message of expectation 1 time, 2 represent the cross-domain forwarding loopback request message of expectation 2 times, and 3 represent the cross-domain forwarding loopback request message of expectation 3 times, and 4 represent that the cross-domain forwarding loopback request message 4 of expectation is inferior; Cross-domain status indicator can be also other characters with identification function, for example, and can be as shown in table 1:
Table 1
| Character | Cross-domain state |
| a | Do not need cross-domain forwarding loopback request message |
| b | Expect cross-domain forwarding loopback request message 1 time |
| c | Expect cross-domain forwarding loopback request message 2 times |
| d | Expect cross-domain forwarding loopback request message 3 times |
| …… | …… |
Whether cross-domain status indicator forwards loopback request message to foreign lands router for the router identifying on LSP, and the router on this LSP is positioned at different AS from foreign lands router.Wherein, echo request message can be LSP Echo request (label forwarding path acknowledges requests) message, in can the TLV field in echo request message, increase Cross-domain TTL (cross-domain life span value) field and represent cross-domain status indicator, in subsequent descriptions, by the Cross-domain ttl field increasing in the TLV field in echo request message referred to as TTL.Optionally, initial value that can TTL is set to expect cross-domain number.
102, when described echo request message carries service label, obtain Label Forwarding Information Base.
Wherein, service label represents that echo request message is to send to router on LSP by this territory router, and the router on this territory router and LSP is positioned at same AS.When echo request message does not carry service label, illustrate that echo request message sends to this territory router by foreign lands router, whether in route forwarding table, check on LSP exists this foreign lands router to arrive the path of this territory router, if exist, this foreign lands router forwards loopback request message to this territory router, thereby realized cross-domain function, and continued echo request message to forward in the Autonomous Domain at the cross-domain router place that receives echo request message.
103, according to described Label Forwarding Information Base, detect described service label and whether have down hop service label.
Wherein, in Label Forwarding Information Base, store the redirect relation of each service label and each service label.By the redirect relation of each label, can check whether certain label exists down hop service label.
104, if exist, to this territory router corresponding to described down hop service label, forward described echo request message.
Wherein, this territory router that down hop service label is corresponding forwards loopback request message and forwards according to routing rule.
105, if do not exist, according to described cross-domain status indicator, determine whether to forward described echo request message to described foreign lands router, make the terminal router on described LSP send the first back response message to initial router.
Wherein, the first back response message is communicated with for determining LSP.When down hop service label does not exist, need the service label of echo request message to peel off, check cross-domain status indicator in internal layer field.
A kind of method that the embodiment of the present invention provides network connectivty to detect, be applied to BGP/MPLS VPN network, can in echo request message, increase for identifying the cross-domain status indicator that whether needs cross-domain forwarding loopback request message, echo request message is forwarded by LSP, by cross-domain status indicator, judge whether to need cross-domain, when needs are cross-domain, the router of the outside Autonomous Domain of router on LSP forwards loopback request message, when not needing when cross-domain, the router on LSP forwards loopback request message to the next router in this Autonomous Domain; Make the terminal router on LSP send loopback response message to initial router, according to the content of back response message, determine the connectedness between the upper router of LSP.Compare with the prior art of detection of connectivity between the upper router of LSP in the network that can only realize in single domain, scheme provided by the invention is by increasing cross-domain status indicator, be used for identifying and whether need cross-domain forwarding loopback request message, echo request message can cross-domainly be forwarded, and make the router on LSP no matter be positioned at this Autonomous Domain or outer Autonomous Domain, can both be after receiving echo request message, to initial router, send loopback response message, initial router receives back response message, in realizing single domain in network on LSP in the detection of connectivity between router, can also realize the detection of connectivity between the upper router of LSP in the BGP/MPLS VPN network under cross-domain mode.Utilize service label, can learn that the echo request message receiving is from this Autonomous Domain or outer Autonomous Domain, thereby whether the echo request message that judgement receives is cross-domain.
Further, on the basis of the scheme shown in Fig. 2, the embodiment of the present invention also provides a kind of concrete scheme of method of network connectivty detection, can be used in MPLS LSP Ping detects, the implementation further refinement of this programme to 105 in the scheme shown in Fig. 2, wherein, 105 can specific implementation be 1051a-1053a or 1051b-1054b as shown in Figure 3, comprising:
101, the router on described LSP receives echo request message.
102, when described echo request message carries service label, obtain Label Forwarding Information Base.
103, according to described Label Forwarding Information Base, detect described service label and whether have down hop service label.
104, if exist, to this territory router corresponding to described down hop service label, forward described echo request message.
1051a, when described cross-domain status indicator is 0, whether the address information that detects the router on described LSP mates with described destination address information.
Wherein, cross-domain status indicator can be used numeral, when cross-domain status indicator is 0, the now LSP forward-path termination of echo request message in this territory is described.
1052a, if coupling is determined the terminal router that the router on described LSP is described LSP.
Wherein, when the address information of the router on LSP is mated with destination address information, router on this LSP is the terminal router of this LSP, and the terminal router of this LSP sends MPLS Echo Reply (label forwarding path is replied reply) message to the initial router of this LSP, the initial router of this LSP receives this MPLS Echo Reply message, thereby detect this LSP, is communicated with.
1053a, if do not mate, the router on described LSP sends errored response message to initial router.
Wherein, errored response message is the response message that carries error message, and when the address information of the router on LSP is not mated with destination address information, the router on LSP sends errored response message to initial router.Errored response message can be in MPLS Echo Reply message, to fill the response message forming after Error Code (error identification position), when initial router receives errored response message, shows that this LSP is not communicated with.
1051b, when described cross-domain status indicator is not 0, the terminal router of determining described LSP is foreign lands router.
Wherein, described cross-domain status indicator is not 0 can represent with TTL ≠ 0, when TTL ≠ 0, need to be by echo request message repeating the router to another Autonomous Domain, i.e. foreign lands router.When needs cross-domain by echo request message repeating during to the router of another Autonomous Domain, service label can be carried out to pop down processing, make foreign lands router detection less than service label, and work as foreign lands router, receive this echo request message, and this echo request message is carried out after service label detection, the processing of service label need to being popped, makes the next hop router of upper this foreign lands router of LSP carry out follow-up processing flow according to service label.
1052b, obtains route forwarding table, and detects the router that whether exists in described route forwarding table from LSP to the path of the terminal router of described LSP.
Wherein, in route forwarding table, store the path comprising between each router and each router.
1053b, if exist, the terminal router to described LSP forwards described echo request message.
Wherein, if having router from LSP in route forwarding table to the path of the terminal router of LSP, the terminal router to LSP forwards loopback request message.
1054b, if do not exist, the router on described LSP sends errored response message to initial router.Wherein, the first back response message can be MPLS Echo Reply message.While not having router from LSP to the path of the terminal router of LSP in route forwarding table, can send errored response message to initial router, can in MPLS Echo Reply message, fill Error Code position.When initial router is received errored response message, prove that the LSP detecting is not communicated with.
A kind of method that the embodiment of the present invention provides network connectivty to detect, be applied to BGP/MPLS VPN network, can in echo request message, increase for identifying the cross-domain status indicator that whether needs cross-domain forwarding loopback request message, echo request message is forwarded by LSP, by cross-domain status indicator, judge whether to need cross-domain, when needs are cross-domain, the router of the outside Autonomous Domain of router on LSP forwards loopback request message, when not needing when cross-domain, the router on LSP forwards loopback request message to the next router in this Autonomous Domain; Make the terminal router on LSP send loopback response message to initial router, according to the content of back response message, determine the connectedness between the upper router of LSP.Compare with the prior art of detection of connectivity between the upper router of LSP in the network that can only realize in single domain, scheme provided by the invention is by increasing cross-domain status indicator, be used for identifying and whether need cross-domain forwarding loopback request message, echo request message can cross-domainly be forwarded, and make the router on LSP no matter be positioned at this Autonomous Domain or outer Autonomous Domain, can both be after receiving echo request message, to initial router, send loopback response message, initial router receives back response message, in realizing single domain in network on LSP in the detection of connectivity between router, can also realize the detection of connectivity between the upper router of LSP in the BGP/MPLS VPN network under cross-domain mode.Whether the first back response message or the errored response message that by initial router, receive the upper router transmission of LSP can judge in single domain whether be communicated with between the upper router of LSP, also can judge under cross-domain mode and be communicated with between the upper router of LSP.
Optionally, on the basis of the scheme shown in Fig. 3, the embodiment of the present invention also provides a kind of concrete scheme of method of network connectivty detection, and this programme can add 1055b after 1053b, as shown in Figure 4, comprising:
101, the router on described LSP receives echo request message.
102, when described echo request message carries service label, obtain Label Forwarding Information Base.
103, according to described Label Forwarding Information Base, detect described service label and whether have down hop service label.
104, if exist, to this territory router corresponding to described down hop service label, forward described echo request message.
1051a, when described cross-domain status indicator is 0, whether the address information that detects the router on described LSP mates with described destination address information.
1052a, if coupling is determined the terminal router that the router on described LSP is described LSP.
1053a, if do not mate, the router on described LSP sends errored response message to initial router.
1051b, when described cross-domain status indicator is not 0, the terminal router of determining described LSP is foreign lands router.
1052b, obtains route forwarding table, and detects the router that whether exists in described route forwarding table from LSP to the path of the terminal router of described LSP.
1053b, if exist, the terminal router to described LSP forwards described echo request message.
1055b, subtracts 1 by the desired number of the described leap Autonomous Domain in described cross-domain status indicator.
Wherein, initial value that can TTL is set to expect cross-domain number, and when the router on LSP forwards loopback request message to foreign lands router, the value of TTL just subtracts 1.For example: echo request message when being forwarded to the router of certain AS, the TTL=5 in echo request message, when echo request message is when this router is forwarded to the router next AS, corresponding TTL=4.
1054b, if do not exist, the router on described LSP sends errored response message to initial router.
A kind of method that the embodiment of the present invention provides network connectivty to detect, be applied to BGP/MPLS VPN network, can in echo request message, increase for identifying the cross-domain status indicator that whether needs cross-domain forwarding loopback request message, echo request message is forwarded by LSP, by cross-domain status indicator, judge whether to need cross-domain, when needs are cross-domain, the router of the outside Autonomous Domain of router on LSP forwards loopback request message, when not needing when cross-domain, the router on LSP forwards loopback request message to the next router in this Autonomous Domain; Make the terminal router on LSP send loopback response message to initial router, according to the content of back response message, determine the connectedness between the upper router of LSP.Compare with the prior art of detection of connectivity between the upper router of LSP in the network that can only realize in single domain, scheme provided by the invention is by increasing cross-domain status indicator, be used for identifying and whether need cross-domain forwarding loopback request message, echo request message can cross-domainly be forwarded, and make the router on LSP no matter be positioned at this Autonomous Domain or outer Autonomous Domain, can both be after receiving echo request message, to initial router, send loopback response message, initial router receives back response message, in realizing single domain in network on LSP in the detection of connectivity between router, can also realize the detection of connectivity between the upper router of LSP in the BGP/MPLS VPN network under cross-domain mode.When the every cross-domain forwarding of echo request message once, just the value of TTL is subtracted to 1, by the initial value of TTL and the currency of TTL, can obtain echo request message number of cross-domain Autonomous Domain on LSP.
Optionally, on the basis of the scheme shown in Fig. 4, the embodiment of the present invention also provides a kind of concrete scheme of method of network connectivty detection, can be used in MPLS LSP Traceroute detects, this programme can add 104a, 104b after 104, after 1055b, add 1056b, 1057b, as shown in Figure 5, comprising:
101, the router on described LSP receives echo request message.
102, when described echo request message carries service label, obtain Label Forwarding Information Base.
103, according to described Label Forwarding Information Base, detect described service label and whether have down hop service label.
104, if exist, to this territory router corresponding to described down hop service label, forward described echo request message.
104a, obtains the address information of this territory router that described down hop service label is corresponding, and generates the second back response message.
Wherein, the second back response message comprises the address information of this territory router that down hop service label is corresponding.The address information of this territory router that down hop service label is corresponding can be downstream interface address and outgoing label, in concrete enforcement, the address information of this territory router corresponding to down hop service label can be inserted in Downstream Label (downstream label) field of MPLS Echo Reply message.MPLS LSP Traceroute is the instrument to LSP location failed router, in concrete scheme, can realize with transmitting the second back response message.Echo request message forwards by the router on LSP, when the router on LSP receives echo request message, router on LSP sends the second back response message to initial router, in the second back response message, carry the address information of corresponding this territory router of down hop service label of the upper router of LSP, wherein, on same LSP, the last router of the upper router of this LSP has sent the address information of the upper router of this LSP to initial router.By the second back response message is sent to initial router, when initial router receives the second back response message, illustrate that the router on this LSP can normally move, when the router on this LSP breaks down, failed router cannot send the second back response message to initial router, so initial router does not receive the second back response message that failed router sends, thereby the address information of the failed router in the second back response message sending according to the last router of failed router, location failed router.
104b, the initial router on described LSP sends described the second back response message.
Wherein, the router on LSP sends the second back response message to the initial router on LSP, when initial router is received the second back response message, represents that LSP is communicated with.
1051a, when described cross-domain status indicator is 0, whether the address information that detects the router on described LSP mates with described destination address information.
1052a, if coupling is determined the terminal router that the router on described LSP is described LSP.
1053a, if do not mate, the router on described LSP sends errored response message to initial router.
1051b, when described cross-domain status indicator is not 0, the terminal router of determining described LSP is foreign lands router.
1052b, obtains route forwarding table, and detects the router that whether exists in described route forwarding table from LSP to the path of the terminal router of described LSP.
1053b, if exist, the terminal router to described LSP forwards described echo request message.
1055b, subtracts 1 by the desired number of the described leap Autonomous Domain in described cross-domain status indicator.
1056b, generates the 3rd back response message.
Wherein, when the router on LSP forwards loopback request message to the router on foreign lands, the router on LSP generates the 3rd back response message, and the address information of the router on these foreign lands in the 3rd back response message is filled to 0.The 3rd back response message is located in the implementation process of failed router at MPLS LSP Traceroute to LSP, need to forward loopback request message by the path order of the upper router of LSP, when echo request message needs cross-domain forwarding, router on LSP generates the 3rd back response message, wherein, on same LSP, the previous router of the upper router of described LSP has sent the address information of the upper router of LSP to initial router.Router on LSP sends to initial router by the 3rd back response message, when initial router receives the 3rd back response message, illustrate that the router on this LSP can normally move, and be to need cross-domain forwarding loopback request message, when the router on this LSP breaks down, failed router cannot send the 3rd back response message, initial router does not receive the 3rd back response message, thereby the 3rd back response message sending according to the last router of failed router, location failed router.
1057b, the initial router on described LSP sends the 3rd back response message.
Wherein, if initial router receives the 3rd back response message, between the upper router of LSP, there is connectedness.
1054b, if do not exist, the router on described LSP sends errored response message to initial router.
A kind of method that the embodiment of the present invention provides network connectivty to detect, be applied to BGP/MPLS VPN network, can in echo request message, increase for identifying the cross-domain status indicator that whether needs cross-domain forwarding loopback request message, echo request message is forwarded by LSP, by cross-domain status indicator, judge whether to need cross-domain, when needs are cross-domain, the router of the outside Autonomous Domain of router on LSP forwards loopback request message, when not needing when cross-domain, the router on LSP forwards loopback request message to the next router in this Autonomous Domain; Make the terminal router on LSP send loopback response message to initial router, according to the content of back response message, determine the connectedness between the upper router of LSP.Compare with the prior art of detection of connectivity between the upper router of LSP in the network that can only realize in single domain, scheme provided by the invention is by increasing cross-domain status indicator, be used for identifying and whether need cross-domain forwarding loopback request message, echo request message can cross-domainly be forwarded, and make the router on LSP no matter be positioned at this Autonomous Domain or outer Autonomous Domain, can both be after receiving echo request message, to initial router, send loopback response message, initial router receives back response message, in realizing single domain in network on LSP in the detection of connectivity between router, can also realize the detection of connectivity between the upper router of LSP in the BGP/MPLS VPN network under cross-domain mode.By the address information of the upper router of LSP is sent to initial router, when initial router receives the address information of the upper router of LSP, illustrate that router corresponding to this address can normally move, when router corresponding to this address information breaks down, failed router cannot send response message, initial router does not receive the second back response message or the 3rd back response message, thereby can locate failed router.
The device 200 that the embodiment of the present invention also provides a kind of network connectivty to detect, for the Border Gateway Protocol across Autonomous Domain/multi protocol label conversion VPN (virtual private network) BGP/MPLS VPN, BGP/MPLS VPN comprises at least two Autonomous Domain AS, and AS comprises a plurality of routers; BGP/MPLS VPN comprises at least one label switched path LSP, and a LSP comprises an initial router and a terminal router, and as shown in Figure 6, device 200 comprises:
Message receiver module 201, for receiving echo request message.
Wherein, echo request message comprises cross-domain status indicator, and whether cross-domain status indicator forwards loopback request message to foreign lands router for the router identifying on LSP, and the router on LSP is positioned at different AS from foreign lands router.
Label Forwarding Information Base acquisition module 202, for obtaining Label Forwarding Information Base.
Wherein, service label represents that echo request message is to send to router on LSP by this territory router, and the router on this territory router and LSP is positioned at same AS.
Whether label detection module 203, there is down hop service label for detection of described service label.
Packet forwarding module 204, for when existing, this territory router corresponding to described down hop service label forwards described echo request message.
Cross-domain judge module 205, for when not existing, according to described cross-domain status indicator, determines whether to forward described echo request message to described foreign lands router, makes the terminal router on described LSP send the first back response report to initial router.
Wherein, the first back response message is communicated with for determining LSP.
The device that the embodiment of the present invention provides a kind of network connectivty to detect, be applied to BGP/MPLS VPN network, can in echo request message, increase for identifying the cross-domain status indicator that whether needs cross-domain forwarding loopback request message, echo request message is forwarded by LSP, by cross-domain status indicator, judge whether to need cross-domain, when needs are cross-domain, the router of the outside Autonomous Domain of router on LSP forwards loopback request message, when not needing when cross-domain, the router on LSP forwards loopback request message to the next router in this Autonomous Domain; Make the terminal router on LSP send loopback response message to initial router, according to the content of back response message, determine the connectedness between the upper router of LSP.Compare with the prior art of detection of connectivity between the upper router of LSP in the network that can only realize in single domain, scheme provided by the invention is by increasing cross-domain status indicator, be used for identifying and whether need cross-domain forwarding loopback request message, echo request message can cross-domainly be forwarded, and make the router on LSP no matter be positioned at this Autonomous Domain or outer Autonomous Domain, can both be after receiving echo request message, to initial router, send loopback response message, initial router receives back response message, in realizing single domain in network on LSP in the detection of connectivity between router, can also realize the detection of connectivity between the upper router of LSP in the BGP/MPLS VPN network under cross-domain mode.Utilize service label, can learn that the echo request message receiving is from this Autonomous Domain or outer Autonomous Domain, thereby whether the echo request message that judgement receives is cross-domain.
Further, as shown in Figure 7, the cross-domain judge module 205 in device 200 comprises:
Detecting unit 2051, for when described cross-domain status indicator is 0, whether the address information that detects the router on described LSP mates with described destination address information.
Determining unit 2052, for when mating, determines the terminal router that the router on described LSP is described LSP.
Evaluation of end point unit 2053, for when described cross-domain status indicator is 0, the terminal router of determining described LSP is foreign lands router.
Route forwarding table acquiring unit 2054, for obtaining route forwarding table, and detects the router that whether exists in described route forwarding table from LSP to the path of the terminal router of described LSP.
Message repeating unit 2055, for when existing, forwards described echo request message to the terminal router of described LSP.
The device that the embodiment of the present invention provides a kind of network connectivty to detect, be applied to BGP/MPLS VPN network, can in echo request message, increase for identifying the cross-domain status indicator that whether needs cross-domain forwarding loopback request message, echo request message is forwarded by LSP, by cross-domain status indicator, judge whether to need cross-domain, when needs are cross-domain, the router of the outside Autonomous Domain of router on LSP forwards loopback request message, when not needing when cross-domain, the router on LSP forwards loopback request message to the next router in this Autonomous Domain; Make the terminal router on LSP send loopback response message to initial router, according to the content of back response message, determine the connectedness between the upper router of LSP.Compare with the prior art of detection of connectivity between the upper router of LSP in the network that can only realize in single domain, scheme provided by the invention is by increasing cross-domain status indicator, be used for identifying and whether need cross-domain forwarding loopback request message, echo request message can cross-domainly be forwarded, and make the router on LSP no matter be positioned at this Autonomous Domain or outer Autonomous Domain, can both be after receiving echo request message, to initial router, send loopback response message, initial router receives back response message, in realizing single domain in network on LSP in the detection of connectivity between router, can also realize the detection of connectivity between the upper router of LSP in the BGP/MPLS VPN network under cross-domain mode.Whether the first back response message or the errored response message that by initial router, receive the upper router transmission of LSP can judge in single domain whether be communicated with between the upper router of LSP, also can judge under cross-domain mode and be communicated with between the upper router of LSP.
In addition, as shown in Figure 8, the cross-domain judge module 205 in device 200 also comprises:
Cross-domain number unit 2056, for subtracting 1 by the desired number of the described leap Autonomous Domain of described cross-domain status indicator.
Optionally, cross-domain status indicator comprises the desired number of crossing over Autonomous Domain in sign echo request message repeating process.
The device that the embodiment of the present invention provides a kind of network connectivty to detect, be applied to BGP/MPLS VPN network, can in echo request message, increase for identifying the cross-domain status indicator that whether needs cross-domain forwarding loopback request message, echo request message is forwarded by LSP, by cross-domain status indicator, judge whether to need cross-domain, when needs are cross-domain, the router of the outside Autonomous Domain of router on LSP forwards loopback request message, when not needing when cross-domain, the router on LSP forwards loopback request message to the next router in this Autonomous Domain; Make the terminal router on LSP send loopback response message to initial router, according to the content of back response message, determine the connectedness between the upper router of LSP.Compare with the prior art of detection of connectivity between the upper router of LSP in the network that can only realize in single domain, scheme provided by the invention is by increasing cross-domain status indicator, be used for identifying and whether need cross-domain forwarding loopback request message, echo request message can cross-domainly be forwarded, and make the router on LSP no matter be positioned at this Autonomous Domain or outer Autonomous Domain, can both be after receiving echo request message, to initial router, send loopback response message, initial router receives back response message, in realizing single domain in network on LSP in the detection of connectivity between router, can also realize the detection of connectivity between the upper router of LSP in the BGP/MPLS VPN network under cross-domain mode.When the every cross-domain forwarding of echo request message once, just the value of TTL is subtracted to 1, by the initial value of TTL and the currency of TTL, can obtain echo request message number of cross-domain Autonomous Domain on LSP.
In addition, as shown in Figure 9, the cross-domain judge module 205 in device 200 also comprises:
The first message generation unit 205a, for obtaining the address information of this territory router that described down hop service label is corresponding, and generates the second back response message.
Wherein, the second back response message comprises the address information of this territory router that down hop service label is corresponding.
The first packet sending unit 205b, sends described the second back response message for the initial router on described LSP.
The second message generation unit 205c, for generating the 3rd back response message.
Wherein, the address of the terminal router of the LSP in the 3rd back response message is 0.
The second packet sending unit 205d, sends the 3rd back response message for the initial router on described LSP.
The device that the embodiment of the present invention provides a kind of network connectivty to detect, be applied to BGP/MPLS VPN network, can in echo request message, increase for identifying the cross-domain status indicator that whether needs cross-domain forwarding loopback request message, echo request message is forwarded by LSP, by cross-domain status indicator, judge whether to need cross-domain, when needs are cross-domain, the router of the outside Autonomous Domain of router on LSP forwards loopback request message, when not needing when cross-domain, the router on LSP forwards loopback request message to the next router in this Autonomous Domain; Make the terminal router on LSP send loopback response message to initial router, according to the content of back response message, determine the connectedness between the upper router of LSP.Compare with the prior art of detection of connectivity between the upper router of LSP in the network that can only realize in single domain, scheme provided by the invention is by increasing cross-domain status indicator, be used for identifying and whether need cross-domain forwarding loopback request message, echo request message can cross-domainly be forwarded, and make the router on LSP no matter be positioned at this Autonomous Domain or outer Autonomous Domain, can both be after receiving echo request message, to initial router, send loopback response message, initial router receives back response message, in realizing single domain in network on LSP in the detection of connectivity between router, can also realize the detection of connectivity between the upper router of LSP in the BGP/MPLS VPN network under cross-domain mode.By the address information of the upper router of LSP is sent to initial router, when initial router receives the address information of the upper router of LSP, illustrate that router corresponding to this address can normally move, when router corresponding to this address information breaks down, failed router cannot send response message, initial router does not receive the second back response message or the 3rd back response message, thereby can locate failed router.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually referring to, each embodiment stresses is the difference with other embodiment.Especially, for apparatus embodiments, because it is substantially similar in appearance to embodiment of the method, so describe fairly simplely, relevant part is referring to the part explanation of embodiment of the method.
One of ordinary skill in the art will appreciate that all or part of flow process realizing in above-described embodiment method, to come the hardware that instruction is relevant to complete by computer program, described program can be stored in a computer read/write memory medium, this program, when carrying out, can comprise as the flow process of the embodiment of above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1. the method that a network connectivty detects, it is characterized in that, for the Border Gateway Protocol across Autonomous Domain/multi protocol label conversion VPN (virtual private network) BGP/MPLS VPN, described BGP/MPLS VPN comprises at least two Autonomous Domain AS, and described AS comprises a plurality of routers; Described BGP/MPLS VPN comprises at least one label switched path LSP, and a LSP comprises an initial router and a terminal router; Described method comprises:
Router on described LSP receives echo request message, described echo request message comprises cross-domain status indicator, whether described cross-domain status indicator forwards described echo request message to foreign lands router for the router identifying on described LSP, and the router on described LSP is positioned at different AS from described foreign lands router;
When described echo request message carries service label, obtain Label Forwarding Information Base, described service label represents that described echo request message is to send to router on described LSP by this territory router, and the router on described this territory router and described LSP is positioned at same AS;
According to described Label Forwarding Information Base, detect described service label and whether have down hop service label;
If exist, forward described echo request message to this territory router corresponding to described down hop service label;
If do not exist, according to described cross-domain status indicator, determine whether to forward described echo request message to described foreign lands router, make the terminal router on described LSP send the first back response message to initial router, described the first back response message is communicated with for determining described LSP.
2. method according to claim 1, is characterized in that, described cross-domain status indicator comprises the desired number of crossing over Autonomous Domain in the described echo request message repeating process of sign.
3. method according to claim 1, is characterized in that, in described echo request message, comprises destination address information, the address information of the terminal router that described destination address information is described LSP;
Described according to described cross-domain status indicator, determine whether to forward described echo request message to described foreign lands router, comprising:
When described cross-domain status indicator is 0, whether the address information that detects the router on described LSP mates with described destination address information;
If coupling, determines the terminal router that the router on described LSP is described LSP;
When described cross-domain status indicator is not 0, the terminal router of determining described LSP is foreign lands router;
Obtain route forwarding table, and detect the router that whether exists in described route forwarding table from LSP to the path of the terminal router of described LSP;
If exist, the terminal router to described LSP forwards described echo request message.
4. according to the method in claim 2 or 3, it is characterized in that, when having router from LSP to the path of the terminal router of described LSP in described route forwarding table, after the terminal router of described LSP forwards described echo request message, also comprise:
The desired number of the described leap Autonomous Domain in described cross-domain status indicator is subtracted to 1.
5. according to the method described in claim 1 or 3, it is characterized in that, described by described echo request message repeating this territory router corresponding to down hop service label after, also comprise:
Obtain the address information of this territory router that described down hop service label is corresponding, and generate the second back response message, described the second back response message comprises the address information of this territory router that described down hop service label is corresponding;
Initial router on described LSP sends described the second back response message;
After the described terminal router to described LSP forwards described echo request message, also comprise:
Generate the 3rd back response message, the address of the terminal router of the described LSP in described the 3rd back response message is 0;
Initial router on described LSP sends the 3rd back response message.
6. the device that a network connectivty detects, it is characterized in that, for the Border Gateway Protocol across Autonomous Domain/multi protocol label conversion VPN (virtual private network) BGP/MPLS VPN, described BGP/MPLS VPN comprises at least two Autonomous Domain AS, and described AS comprises a plurality of routers; Described BGP/MPLS VPN comprises at least one label switched path LSP, and a LSP comprises an initial router and a terminal router; Described device comprises:
Message receiver module, be used for receiving echo request message, described echo request message comprises cross-domain status indicator, whether described cross-domain status indicator forwards described echo request message to foreign lands router for the router identifying on described LSP, and the router on described LSP is positioned at different AS from described foreign lands router;
Label Forwarding Information Base acquisition module, for obtaining Label Forwarding Information Base, described service label represents that described echo request message is to send to router on described LSP by this territory router, the router on described this territory router and described LSP is positioned at same AS;
Whether label detection module, there is down hop service label for detection of described service label;
Packet forwarding module, for when existing, this territory router corresponding to described down hop service label forwards described echo request message;
Cross-domain judge module, for when not existing, according to described cross-domain status indicator, determine whether to forward described echo request message to described foreign lands router, make the terminal router on described LSP send the first back response message to initial router, described the first back response message is communicated with for determining described LSP.
7. device according to claim 6, is characterized in that, described cross-domain status indicator comprises the desired number of crossing over Autonomous Domain in the described echo request message repeating process of sign.
8. device according to claim 6, is characterized in that, in described echo request message, comprises destination address information, the address information of the terminal router that described destination address information is described LSP;
Described cross-domain judge module, comprising:
Detecting unit, for when described cross-domain status indicator is 0, whether the address information that detects the router on described LSP mates with described destination address information;
Determining unit, for when mating, determines the terminal router that the router on described LSP is described LSP;
Evaluation of end point unit, for when described cross-domain status indicator is 0, the terminal router of determining described LSP is foreign lands router;
Route forwarding table acquiring unit, for obtaining route forwarding table, and detects the router that whether exists in described route forwarding table from LSP to the path of the terminal router of described LSP;
Message repeating unit, for when existing, forwards described echo request message to the terminal router of described LSP.
9. according to the device described in claim 7 or 8, it is characterized in that, described cross-domain judge module, also comprises:
Cross-domain number unit, for subtracting 1 by the desired number of the described leap Autonomous Domain of described cross-domain status indicator.
10. according to the device described in claim 6 or 8, it is characterized in that, described cross-domain judge module, also comprises:
The first message generation unit, for obtaining the address information of this territory router that described down hop service label is corresponding, and generating the second back response message, described the second back response message comprises the address information of this territory router that described down hop service label is corresponding;
The first packet sending unit, sends described the second back response message for the initial router on described LSP;
The second message generation unit, for generating the 3rd back response message, the address of the terminal router of the described LSP in described the 3rd back response message is 0;
The second packet sending unit, sends the 3rd back response message for the initial router on described LSP.
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