CN105119821A - IS-IS protocol to LDP protocol negotiation neighbor method and system - Google Patents
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Abstract
The present invention discloses an IS-IS protocol to LDP protocol negotiation neighbor method and system. The method comprises the following steps that a first middle system IS establishes down neighbor relationship with and communicates with a second middle system IS through a first link, and when the first middle system IS receives the hello packet sent by the second middle system IS through a second link, the interface index of a hello packet interface is used to inquire the LDP state of the interface; when the LDP does not establish a protocol session, the neighbor state of the second middle system IS is set to be INIT, and when a neighbor protocol UP condition is satisfied by the first middle system IS and the second middle system IS on the second link and when the establishment of an LDP session by the first middle system IS and the second middle system IS on the second link is completed, an LDP uses new routing information to establish a new label to exchange an original path LSP, and the first middle system IS and the second middle system IS switch to the second link for communication. The problem of flow interruption caused by the asynchronism of the establishment of a neighbor on a new link by IS-IS and the establishment of a session on a link by the LDP is eliminated.
Description
Technical field
The present invention relates to a kind of Intermediate System to Intermediate System and LDP area of agreement, in particular a kind of Intermediate System to Intermediate System is to the method system of LDP protocol negotiation neighbours.
Background technology
Intermediate System to Intermediate System (IS-IS) is a kind of dynamic, based on the Interior Gateway Protocol (IGP) of Link State, after Intermediate System to Intermediate System consults to set up neighbours alternately by hello packet, each intermediate system (IS) produces the link-state information that link-state protocol data bag (LSP) describes this intermediate system (IS), and occur in network, and also can all intermediate systems (IS) equipment sends in storage networking topology LSP, form LSD (LSDB), IS-IS uses link database (LSDB) to be calculated the Optimization route arriving destination address by shortest-path first algorithm (SPF) exactly.
Tag distribution protocol, i.e. LDP(LabelDistributionProtocol), it is a kind of control protocol of multiprotocol label switching (Multi-ProtocolLabelSwitching), be equivalent to the signaling protocol in legacy network, be responsible for forwarding equivalence class (FEC, ForwardingEquivalenceClass) classification, the operations such as the foundation of label distribution and label switched path (LSP, LabelSwitchedPath) and maintenance.By LDP agreement, LSR (LSR, LabelSwitchedRouter) can map directly on the switching path of data link layer the routing iinformation of network layer, sets up the LSP of network layer.
So, when ISIS calculates routing iinformation, the routing iinformation of ISIS directly maps directly on the switching path of data link layer by LDP, sets up in the networking of the LSP of network layer.If there is a new link in the change due to Link State; usually the neighbours that there will be ISIS have set up; the more excellent routing iinformation through new link can be calculated through new link; cause route thinner, at this moment the LSP using original routing iinformation to set up then can delete by LDP agreement, but; on new link; LDP does not also set up session, causes to set up LSP according to new routing information on new link, now causes interrupting in the data traffic of LSP carrying.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of Intermediate System to Intermediate System to the method and system of LDP protocol negotiation neighbours, eliminate IS-IS on new link, set up the problem that neighbours and LDP set up the asynchronous flow interrupt caused of session in link.
Technical scheme of the present invention is as follows:
Intermediate System to Intermediate System, to a LDP protocol negotiation neighbours' method, comprises the following steps:
A, the first intermediate system IS are set up down neighborhood by the first link with the second intermediate system IS and communicate, when the first intermediate system IS receives the hello packet that the second intermediate system IS sent by the second link, utilize the LDP state of the interface index query interface of described hello packet interface;
B, described LDP arrange the second intermediate system IS neighbor state when not setting up protocol conversation is INIT, when on the second link, the first intermediate system IS and the second intermediate system IS meets neighbor protocol UP condition, and the first intermediate system IS and the second intermediate system IS sets up LDP session when completing on this second link;
C, LDP use new routing iinformation to set up the original path LSP of new label switched, and the first intermediate system IS and the second intermediate system IS is switched to the second link communication.
Described Intermediate System to Intermediate System, to the method for LDP protocol negotiation neighbours, wherein, also comprises step D:
Contrast the metric value of the first link and the second link, using the communication link of link less for metric value as intermediate system IS and the second intermediate system IS.
Described Intermediate System to Intermediate System is to the method for LDP protocol negotiation neighbours, and wherein, described step B also specifically comprises:
B1, the first intermediate system IS inquire about the corresponding second intermediate system IS of LDP session corresponding interface when receiving LDP session establishment success message, be left intact when there is not the second intermediate system IS.
Described Intermediate System to Intermediate System is to the method for LDP protocol negotiation neighbours, and wherein, described step B also specifically comprises:
B2, the first intermediate system IS inquire about the corresponding second intermediate system IS of LDP session corresponding interface when receiving LDP session establishment success message, as existence second intermediate system IS and neighbor state is INIT meets Intermediate System to Intermediate System neighbours UP condition, then the neighbor state of the second intermediate system IS of opposite end is set to UP state.
Described Intermediate System to Intermediate System is to the method for LDP protocol negotiation neighbours, and wherein, described step B also specifically comprises:
B3, triggering LDP set up LDP protocol conversation with the second intermediate system on the second LI(link interface).
The present invention also provides a kind of Intermediate System to Intermediate System to the system of LDP protocol negotiation neighbours, comprising:
Detection module, for when the first intermediate system IS is set up down neighborhood by the first link with the second intermediate system IS and communicates, when the first intermediate system IS receives the hello packet that the second intermediate system IS sent by the second link, utilize the LDP state of the interface index query interface of described hello packet interface;
Module is set, the neighbor state arranging the second intermediate system IS when not setting up protocol conversation for described LDP is INIT, when on the second link, the first intermediate system IS and the second intermediate system IS meets neighbor protocol UP condition, and the first intermediate system IS and the second intermediate system IS sets up LDP session when completing on this second link;
Handover module, use new routing iinformation to set up the original path LSP of new label switched for LDP, the first intermediate system IS and the second intermediate system IS is switched to the second link communication.
Described Intermediate System to Intermediate System, to the system of LDP protocol negotiation neighbours, wherein, also comprises step:
Contrast module, for contrasting the metric value of the first link and the second link, using the communication link of link less for metric value as intermediate system IS and the second intermediate system IS.
Described Intermediate System to Intermediate System is to the system of LDP protocol negotiation neighbours, and wherein, the described module that arranges also comprises:
First arranges module, inquiring about the corresponding second intermediate system IS of LDP session corresponding interface, being left intact when there is not the second intermediate system IS when receiving LDP session establishment success message for the first intermediate system IS.
Described Intermediate System to Intermediate System is to the system of LDP protocol negotiation neighbours, and wherein, the described module that arranges also comprises:
Second arranges module, the corresponding second intermediate system IS of LDP session corresponding interface is inquired about when receiving LDP session establishment success message for the first intermediate system IS, as existence second intermediate system IS and neighbor state is INIT meets Intermediate System to Intermediate System neighbours UP condition, then the neighbor state of the second intermediate system IS of opposite end is set to UP state.
Described Intermediate System to Intermediate System is to the system of LDP protocol negotiation neighbours, and wherein, the described module that arranges also comprises:
3rd arranges module, sets up LDP protocol conversation for triggering LDP on the second LI(link interface) with the second intermediate system.
Intermediate System to Intermediate System provided by the present invention is to the method and system of LDP protocol negotiation neighbours, eliminate router-level topology in Intermediate System to Intermediate System to complete but the flow interrupt causing label switching path LSP to re-establish is not set up in LDP session, be particularly useful for setting up in the test that route switches fast neighbours.
Accompanying drawing explanation
Fig. 1 be in the present invention Intermediate System to Intermediate System to the topological diagram of the method for LDP protocol negotiation neighbours.
Fig. 2 be in the present invention Intermediate System to Intermediate System to the flow chart of the method for LDP protocol negotiation neighbours.
Embodiment
The invention provides the method and system of a kind of Intermediate System to Intermediate System to LDP protocol negotiation neighbours, for making object of the present invention, technical scheme and effect clearly, clearly, referring to accompanying drawing examples, the present invention is described in more detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to Fig. 2, Intermediate System to Intermediate System provided by the invention, to the method for LDP protocol negotiation neighbours, comprises the following steps:
S100, the first intermediate system IS are set up down neighborhood by the first link with the second intermediate system IS and communicate, when the first intermediate system IS receives the hello packet that the second intermediate system IS sent by the second link, utilize the LDP state of the interface index query interface of described hello packet interface.
As shown in Figure 1, by the network be made up of R1, R2, tester, between R1 and R2, there are two parallel links.Tester is from R1 toward R2 direction transmitted traffic.First stage, between R1 and R2, only have the neighborhood of the first link link1 link establishment above, and the data traffic that metric is 10, R1 arrival R2 discovery walks link1 link; Second stage, between R1 and R2, below the second link link2 link also establishes neighborhood, and the data traffic that metric is 5, R1 arrives R2 direction be switched to away cost smaller below link2 link, handoff procedure requires that flow does not interrupt.First intermediate system IS and the second intermediate system IS sends hello packet by the second link link2, and route utilizes the LDP state of this interface of search index of described hello packet interface.
S200, described LDP arrange the second intermediate system IS neighbor state when not setting up protocol conversation is INIT, when on the second link, the first intermediate system IS and the second intermediate system IS meets neighbor protocol UP condition, and the first intermediate system IS and the second intermediate system IS sets up LDP session when completing on this second link.
Namely the LDP of the second link is unsuccessful set up protocol conversation time, now then arranging neighbor state is INIT state, and IS-IS triggers on the second link link2 LI(link interface) that LDP starts below and sets up LDP session with R2.When R1 receives the hello packet of R2 again, reception hello packet interface obtains corresponding LDP state, find still not set up LDP session, but now ISIS has met the condition that neighbours set up UP, still the neighbor state arranging these neighbours of R2 is INIT, and again triggers on LDP link2 LI(link interface) below and set up LDP session with R2.
S300, LDP use new routing iinformation to set up the original path LSP of new label switched, and the first intermediate system IS and the second intermediate system IS is switched to the second link communication.After LDP the second link link2 LI(link interface) below establishes LDP session with R2, notice IS-IS, IS-IS finds on R1, there are these neighbours of R2, neighbor state is INIT, meet the condition of neighbours UP simultaneously, the neighbor state of these neighbours of R2 is set to UP, and is-is neighbor is successfully established.
Concrete, as shown in Figure 1., between R1 and R2, there are two parallel links in the network be made up of R1, R2, tester.Tester is from R1 toward R2 direction transmitted traffic.First stage, between R1 and R2, only have the neighborhood of the first link link1 link establishment above, and the data traffic that metric is 10, R1 arrival R2 discovery walks the first link link1 link; Second stage, between R1 and R2, the second link link2 link also establishes neighborhood below, and metric is 5, R1 arrive the data traffic in R2 direction be switched to away cost smaller below the second link link2 link, handoff procedure requires that flow does not interrupt.
Start, in first stage, only have the neighborhood of the first link link1 link establishment above between R1 and R2, and metric is 10, the data traffic that R1 arrives R2 direction walks the first link link1 link, because only have the link of a unique first link link1 to select.Second stage, between R1 and R2, below the second link link2 link also establishes neighborhood, and the quantity that metric is 5, R1 arrives R2 direction be switched to cost smaller below the second link link2 link, there occurs flow interrupt in handoff procedure.Therefore also comprise step S400, contrast the metric value of the first link and the second link, using the communication link of link less for metric value as intermediate system IS and the second intermediate system IS.
Because, after ISIS neighbours set up, ISIS by route handoff to below the link of the smaller metric5 of cost carry out traffic transport.But, ISIS neighbours are successfully established, route has also calculated, but below R2, the session of the second link link2 link LDP agreement is not successfully established, and also just can not set up corresponding label switching path LSP and cause carrying and the flow interrupt in label switching path LSP.Until LDP agreement the second link link2 link below sets up session, re-established label switching path LSP, the flow be carried in label switching path LSP just recovers normal.
After using the present invention, R1 and R2 the second link link2 link below starts to set up neighbours, when R1 receives the hello packet of R2, reception hello packet interface obtains corresponding LDP state, finds not set up LDP session.Now neighbor state is set to INIT, and ISIS triggering LDP starts the second link link2 LI(link interface) below sets up LDP session with R2.When R1 receives the hello packet of R2 again, reception hello packet interface obtains corresponding LDP state, find still not set up LDP session, but now ISIS has met the condition that neighbours set up UP, still the neighbor state arranging these neighbours of R2 is INIT, and again triggers on LDP the second link link2 LI(link interface) below and set up LDP session with R2.After LDP the second link link2 LI(link interface) below establishes LDP session with R2, notice ISIS, ISIS finds on R1, there are these neighbours of R2, neighbor state is INIT, meet the condition of neighbours UP simultaneously, the neighbor state of these neighbours of R2 is set to UP, and ISIS neighbours are successfully established.In this process, because ISIS agreement never sets up the neighbours of UP, so the second link link2 link that also can not calculate routing table and walk below, the original LSP of LDP can not delete the link remained away above, flow always walked above the label switched path LSP of the first link link1 link and unimpeded all the time.After this, the neighbours of second link link2 link establishment below, and LDP session has also been successfully established, R1 will calculate the link of the routing table second link link2 that to have walked below cost smaller, routing iinformation has also just been switched to the link of a smaller second link link2 of cost below, the new label switched path LSP that LDP then uses new routing iinformation to set up, thus make the LSP flow being carried on label switched path continue transmission, without any flow interrupt or packet loss in whole process.
Further, described Intermediate System to Intermediate System is to the method for LDP protocol negotiation neighbours, and described step S200 also specifically comprises:
S210, the first intermediate system IS inquire about the corresponding second intermediate system IS of LDP session corresponding interface when receiving LDP session establishment success message, be left intact when there is not the second intermediate system IS;
S220, the first intermediate system IS inquire about the corresponding second intermediate system IS of LDP session corresponding interface when receiving LDP session establishment success message, as existence second intermediate system IS and neighbor state is INIT meets Intermediate System to Intermediate System neighbours UP condition, then the neighbor state of the second intermediate system IS of opposite end is set to UP state;
S230, triggering LDP set up LDP protocol conversation with the second intermediate system on the second LI(link interface).
Corresponding above-mentioned Intermediate System to Intermediate System is to the method for LDP protocol negotiation neighbours, and this also owes the system providing a kind of Intermediate System to Intermediate System to LDP protocol negotiation neighbours, and it comprises:
Detection module, for when the first intermediate system IS is set up down neighborhood by the first link with the second intermediate system IS and communicates, when the first intermediate system IS receives the hello packet that the second intermediate system IS sent by the second link, utilize the LDP state of the interface index query interface of described hello packet interface, as detailed above.
Module is set, the neighbor state arranging the second intermediate system IS when not setting up protocol conversation for described LDP is INIT, when on the second link, the first intermediate system IS and the second intermediate system IS meets neighbor protocol UP condition, and the first intermediate system IS and the second intermediate system IS sets up LDP session when completing on this second link, as detailed above.
Handover module, use new routing iinformation to set up the original path LSP of new label switched for LDP, the first intermediate system IS and the second intermediate system IS is switched to the second link communication, as detailed above.
Also comprise step:
Contrast module, for contrasting the metric value of the first link and the second link, using the communication link of link less for metric value as intermediate system IS and the second intermediate system IS, as detailed above.
Described Intermediate System to Intermediate System is in the system of LDP protocol negotiation neighbours, and the described module that arranges also comprises:
First arranges module, inquiring about the corresponding second intermediate system IS of LDP session corresponding interface, being left intact, as detailed above when there is not the second intermediate system IS when receiving LDP session establishment success message for the first intermediate system IS.
Second arranges module, the corresponding second intermediate system IS of LDP session corresponding interface is inquired about when receiving LDP session establishment success message for the first intermediate system IS, as existence second intermediate system IS and neighbor state is INIT meets Intermediate System to Intermediate System neighbours UP condition, then the neighbor state of the second intermediate system IS of opposite end is set to UP state, as detailed above.
3rd arranges module, sets up LDP protocol conversation, as detailed above for triggering LDP on the second LI(link interface) with the second intermediate system.
In sum, Intermediate System to Intermediate System provided by the present invention is to the method and system of LDP protocol negotiation neighbours, eliminate router-level topology in Intermediate System to Intermediate System to complete but the flow interrupt causing label switching path LSP to re-establish is not set up in LDP session, be particularly useful for setting up in the test that route switches fast neighbours.
Should be understood that, application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, and such as, all these improve and convert the protection range that all should belong to claims of the present invention.
Claims (10)
1. Intermediate System to Intermediate System is to a LDP protocol negotiation neighbours' method, it is characterized in that, comprises the following steps:
A, the first intermediate system IS are set up down neighborhood by the first link with the second intermediate system IS and communicate, when the first intermediate system IS receives the hello packet that the second intermediate system IS sent by the second link, utilize the LDP state of the interface index query interface of described hello packet interface;
B, described LDP arrange the second intermediate system IS neighbor state when not setting up protocol conversation is INIT, when on the second link, the first intermediate system IS and the second intermediate system IS meets neighbor protocol UP condition, and the first intermediate system IS and the second intermediate system IS sets up LDP session when completing on this second link;
C, LDP use new routing iinformation to set up the original path LSP of new label switched, and the first intermediate system IS and the second intermediate system IS is switched to the second link communication.
2. Intermediate System to Intermediate System according to claim 1 is to the method for LDP protocol negotiation neighbours, it is characterized in that, also comprises step D:
Contrast the metric value of the first link and the second link, using the communication link of link less for metric value as intermediate system IS and the second intermediate system IS.
3. Intermediate System to Intermediate System according to claim 2 is to the method for LDP protocol negotiation neighbours, it is characterized in that, described step B also specifically comprises:
B1, the first intermediate system IS inquire about the corresponding second intermediate system IS of LDP session corresponding interface when receiving LDP session establishment success message, be left intact when there is not the second intermediate system IS.
4. Intermediate System to Intermediate System according to claim 2 is to the method for LDP protocol negotiation neighbours, it is characterized in that, described step B also specifically comprises:
B2, the first intermediate system IS inquire about the corresponding second intermediate system IS of LDP session corresponding interface when receiving LDP session establishment success message, as existence second intermediate system IS and neighbor state is INIT meets Intermediate System to Intermediate System neighbours UP condition, then the neighbor state of the second intermediate system IS of opposite end is set to UP state.
5. Intermediate System to Intermediate System according to claim 2 is to the method for LDP protocol negotiation neighbours, it is characterized in that, described step B also specifically comprises:
B3, triggering LDP set up LDP protocol conversation with the second intermediate system on the second LI(link interface).
6. Intermediate System to Intermediate System is to a LDP protocol negotiation neighbours' system, it is characterized in that, comprising:
Detection module, for when the first intermediate system IS is set up down neighborhood by the first link with the second intermediate system IS and communicates, when the first intermediate system IS receives the hello packet that the second intermediate system IS sent by the second link, utilize the LDP state of the interface index query interface of described hello packet interface;
Module is set, the neighbor state arranging the second intermediate system IS when not setting up protocol conversation for described LDP is INIT, when on the second link, the first intermediate system IS and the second intermediate system IS meets neighbor protocol UP condition, and the first intermediate system IS and the second intermediate system IS sets up LDP session when completing on this second link;
Handover module, use new routing iinformation to set up the original path LSP of new label switched for LDP, the first intermediate system IS and the second intermediate system IS is switched to the second link communication.
7. Intermediate System to Intermediate System according to claim 6 is to the system of LDP protocol negotiation neighbours, it is characterized in that, also comprises step:
Contrast module, for contrasting the metric value of the first link and the second link, using the communication link of link less for metric value as intermediate system IS and the second intermediate system IS.
8. Intermediate System to Intermediate System according to claim 6 is to the system of LDP protocol negotiation neighbours, it is characterized in that, the described module that arranges also comprises:
First arranges module, inquiring about the corresponding second intermediate system IS of LDP session corresponding interface, being left intact when there is not the second intermediate system IS when receiving LDP session establishment success message for the first intermediate system IS.
9. Intermediate System to Intermediate System according to claim 6 is to the system of LDP protocol negotiation neighbours, it is characterized in that, the described module that arranges also comprises:
Second arranges module, the corresponding second intermediate system IS of LDP session corresponding interface is inquired about when receiving LDP session establishment success message for the first intermediate system IS, as existence second intermediate system IS and neighbor state is INIT meets Intermediate System to Intermediate System neighbours UP condition, then the neighbor state of the second intermediate system IS of opposite end is set to UP state.
10. Intermediate System to Intermediate System according to claim 6 is to the system of LDP protocol negotiation neighbours, it is characterized in that, the described module that arranges also comprises:
3rd arranges module, sets up LDP protocol conversation for triggering LDP on the second LI(link interface) with the second intermediate system.
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| CN106789715B (en) * | 2016-04-22 | 2021-05-14 | 新华三技术有限公司 | LSP message length updating method, neighbor negotiation method and device |
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Application publication date: 20151202 |