CN103004150A - Shortest path first neighbor establishing method, node and system thereof - Google Patents
Shortest path first neighbor establishing method, node and system thereof Download PDFInfo
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- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
- H04L45/03—Topology update or discovery by updating link state protocols
Abstract
The invention is applicable to the communication field, provides an OSPF neighbors establishing method, wherein the method comprises the following steps : a shortest path first (OSPF) protocol, the shortest path first (OSPF protocol, the node to the other node in the area of the interface transmitting hello message so as to carry out the neighbor synchronization; acquiring a first node in the interface reaches 2 way state of the interface, the first 2 way of interface state initiating link state database synchronization lsdb, pausing and has been initiated lsdb synchronous except for the subsequent residual interface state synchronization, the follow-up state : 2 way after the state of the state; the first 2 way state of the interface state to achieve the full state, the node to the remaining interface associated with the links (LSA) to achieve the synchronization of the remaining interface and realizing neighbor is established; the area of other nodes is completed synchronously. The method provided by the invention has less data transmission.
Description
Technical field
The invention belongs to the communications field, relate in particular to a kind of SPF neighbours and set up technology.
Background of invention
SPF (Open Shortest Path First, OSPF) be an Interior Gateway Protocol, it is based on the Routing Protocol of Link State, in the situation that the Interface status of OSPF can be used, (two interfaces of opposite end) interval sends hello packet between two interfaces, then set up the two-way communication of two interfaces, after setting up two-way communication, the a series of messages of exchange reach database synchronization between two interfaces, so far, form next-door neighbour's relation between two interfaces, this process is commonly referred to as the process of neighbours' foundation of OSPF.
Yet OSPF is based on interface and carries out synchronously, and namely each interface can be initiated the process that neighbours set up to the interface of opposite end, even a plurality of parallel links between two network elements; For example at two network elements (for the convenience of narrating, here take network element 1 and network element 2 as example) in have two parallel links, be respectively link 1 and link 2, the interface of link 1 correspondence is interface 1 and interface 2, the interface of link 2 correspondences is interface 3 and interface 4, at this moment, after network element 1 or network element 2 reset, network element 1 is by interface 2 a requests Link State declaration (the Link-State Advertisement of interface 1 to network element 2, LSA) after, if interface 1 is not received LSA, interface 3 and interface 4 have begun the synchronous of LSA, so subsynchronous this LSA more also between interface 3 and interface 4.So just caused same LSA to send repeatedly, these are a lot of neighbours, LSD (Link-State Database, LSDB) under the very large network, all neighbours will reach full state (two neighbours' network elements are the state that is close to when concerning fully) a lot of message of needs transmission, and volume of transmitted data is large.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of SPF neighbours method for building up, and it is many to be intended to solve existing technical scheme message transmission, the problem that volume of transmitted data is large.
On the one hand, the embodiment of the invention provides a kind of ospf neighbor method for building up, and described method comprises:
Under the SPF ospf protocol, node is synchronous to carry out neighbours to all interfaces that are connected with this node transmission hello packets of other interior nodes of zone, has finished between other nodes in the described zone synchronously;
Node obtains the interface that reaches at first the 2Way state in the total interface, synchronous to this interface initiation LSD LSDB that reaches at first the 2Way state, suspend synchronous except the succeeding state of initiating the residue interface of LSDB synchronously, described succeeding state is: the state that the 2Way state is later;
After the state of the interface that reaches at first the 2Way state reached the full state, node declared that to this residue interface transmission Link State relevant with link LSA is to realize with the synchronous of residue interface and to realize that neighbours set up.
The embodiment of the invention provides a kind of node, and described node comprises:
Transmitting element, it is synchronous to carry out neighbours to be used for sending hello packet to the interface that is connected with this node of other interior nodes of zone, has finished between other nodes in the described zone synchronously;
Obtain the time-out unit, reach at first the interface of 2Way state for the interface that obtains other nodes, synchronous to this interface initiation LSDB that reaches at first the 2Way state, suspend except the succeeding state of initiating the residue interface of LSDB synchronous synchronously, described succeeding state is: the state that the 2Way state is later;
The residue lock unit is used for after the state of the interface that reaches at first the 2Way state reaches the full state, and node declares that to this residue interface transmission Link State relevant with link LSA is to realize with the synchronous of residue interface and to realize that neighbours set up.
The embodiment of the invention provides a kind of ospf neighbor to set up system, and described system comprises: first node and other nodes;
Described first node is used under the SPF ospf protocol, and is synchronous to carry out neighbours to all interfaces that are connected with described first node transmission hello packets of other interior nodes of zone, finished between other nodes in the described zone synchronously;
Described first node also is used for obtaining the interface that total interface reaches the 2Way state at first, synchronous to this interface initiation LSD LSDB that reaches at first the 2Way state, suspend synchronous except the succeeding state of initiating the residue interface of LSDB synchronously, described succeeding state is: the state that the 2Way state is later;
After the state of the interface that reaches at first the 2Way state reaches the full state, reach the affiliated node of interface of full state, be used for remaining the LSA inundation to the node under the residue interface;
Described first node is used for declaring that to this residue interface transmission Link State relevant with link LSA is to realize with the synchronous of residue interface and to realize that neighbours set up.
In embodiments of the present invention, it is few that technical scheme provided by the invention has a message transmission, the advantage that volume of transmitted data is little.
Brief Description Of Drawings
Fig. 1 is the flow chart of a kind of OSPF method for building up of providing of the specific embodiment of the invention;
Fig. 2 is the structure chart of a kind of node of providing of the specific embodiment of the invention;
Fig. 3 is the network structure that one embodiment of the invention provides;
Fig. 4 is the flow chart of a kind of SPF neighbours method for building up of providing of one embodiment of the invention.
Implement mode of the present invention
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
The specific embodiment of the invention provides a kind of ospf neighbor method for building up, and the method is finished by network side node, and the method is finished under OSPF, and the method comprises the steps: as shown in Figure 1
All interfaces that are connected with this node transmission hello packets of S11, node other nodes in the zone are synchronous to carry out neighbours;
S12, node obtain and reach at first 2Way state (a kind of synchronous state in the interface, when this state is finished, the network element of two end interfaces can be communicated by letter mutually) interface, synchronous to this interface initiation LSDB that reaches at first the 2Way state, suspend synchronous except the succeeding state of initiating the residue interface of LSDB synchronously, succeeding state is: the state that the 2Way state is later;
S13, after the state of the interface that reaches at first the 2Way state reaches the full state, node sends the LSA relevant with link to realize and to remain the synchronous of interface and realize that neighbours set up to this residue interface.
Need to prove that the above-mentioned LSA relevant with link specifically can comprise: No. 1 LSA, No. 9 LSA; In addition, need to prove that in ethernet link, the LSA relevant with link can also comprise: No. 2 LSA.
Need to prove, according to the regulation of RFC2328, every synchronous link in the zone, No. 1 LSA just need to refresh once, so No. 1 LSA all needs to carry when neighbours' foundation and inundation.
Need to prove, all finished between other nodes in the above-mentioned zone synchronously, in addition, the above-mentioned interface that reaches at first the 2Way state might be a plurality of interfaces, when the interface that reaches at first the 2Way state when being a plurality of, it is synchronous then can to select arbitrarily an interface to carry out LSDB from a plurality of interfaces that reach at first the 2Way state.
Optionally, said method can also comprise before S13:
The affiliated node of interface that reaches the full state will remain the LSA inundation to the node under the described residue interface; Wherein said residue LSA comprises: except the LSA No. 9 LSA.
Optionally, the implementation method of above-mentioned S11 specifically comprises:
When node has new link in detecting described zone, synchronous to carry out neighbours to the total interface transmission hello packet of other interior nodes of zone.
Optionally, said method can also comprise after S13: when all links of node start or node when restarting simultaneously, total interface all can be received the hello packet that neighbor node sends.
After method provided by the invention sends hello packet to all nodes in the zone, it is synchronous only the state of the interface that reaches at first the 2Way state to be carried out LSDB, the succeeding state that suspends the residue interface is synchronous, when this interface reaches full state (a kind of synchronous state, when this state is finished, finish synchronously) after, the residue interface is sent the LSA relevant with link can realize synchronously.Owing to only need transmit the LSA relevant with link to the synchronous of residue interface, other LSA(is except the LSA No. 9 LSA, No. 10 LSA for example) all need not transmission (because according to the relevant regulations of RFC2328 and Extended Protocol, other LSA gives the residue interface by the interface inundation that reaches at first the full state), so it is few that it has a message transmission, the advantage that volume of transmitted data is little.
The specific embodiment of the invention also provides a kind of node, and this node comprises as shown in Figure 2:
Transmitting element 21, it is synchronous to carry out neighbours to be used for sending hello packet to the interface that is connected with this node of other interior nodes of zone;
Obtain and suspend unit 22, reach at first the interface of 2Way state for the interface that obtains other nodes, synchronous to this interface initiation LSDB that reaches at first the 2Way state, suspend except the succeeding state of initiating the residue interface of LSDB synchronous synchronously, described succeeding state is: the state that the 2Way state is later;
After node provided by the invention sends hello packet to all nodes in the zone, it is synchronous only the state of the interface that reaches at first the 2Way state to be carried out LSDB, the succeeding state that suspends the residue interface is synchronous, when this interface reaches full state (a kind of synchronous state, when this state is finished, finish synchronously) after, the residue interface is sent the LSA relevant with link can realize synchronously.Owing to only need transmit the LSA relevant with link to the synchronous of residue interface, other LSA(is except the LSA No. 9 LSA, No. 10 LSA for example) all need not transmission (because according to the relevant regulations of RFC2328 and Extended Protocol, other LSA gives the residue interface by the interface inundation that reaches at first the full state), so it is few that it has a message transmission, the advantage that volume of transmitted data is little.
Optionally, the above-mentioned interface that reaches at first the 2Way state is a plurality of interfaces, when the interface that reaches at first the 2Way state when being a plurality of, obtains and suspends unit 22 and specifically be used for:
Obtain a plurality of interfaces that reach at first the 2Way state in the interface of other nodes, it is synchronous to select arbitrarily an interface to initiate LSDB from described a plurality of interfaces, suspend except the LSDB that initiates the residue interface of LSDB synchronous synchronous.
Optionally, the above-mentioned Link State relevant with link declaration LSA specifically comprises:
No. 9 LSA and No. 1 LSA.
Optionally, above-mentioned node also comprises:
Detecting unit 24 for detection of whether new link is arranged in the described zone, has consecutive hours in detecting described zone, control transmitting element 21 is synchronous to carry out neighbours to the total interface transmission hello packet of other interior nodes of zone.
The present invention also provides a kind of ospf neighbor to set up system, and this system comprises: first node and other nodes;
Described first node is used under the SPF ospf protocol, and is synchronous to carry out neighbours to all interfaces that are connected with first node transmission hello packets of other interior nodes of zone, finished between other nodes in the described zone synchronously;
Described first node also is used for obtaining the interface that total interface reaches the 2Way state at first, synchronous to this interface initiation LSD LSDB that reaches at first the 2Way state, suspend synchronous except the succeeding state of initiating the residue interface of LSDB synchronously, described succeeding state is: the state that the 2Way state is later;
After the state of the interface that reaches at first the 2Way state reaches the full state, reach the affiliated node of interface of full state, be used for remaining the LSA inundation to the node under the residue interface;
Described first node is used for declaring that to this residue interface transmission Link State relevant with link LSA is to realize with the synchronous of residue interface and to realize that neighbours set up.
After the first node of system provided by the invention sends hello packet to all nodes in the zone, it is synchronous only the state of the interface that reaches at first the 2Way state to be carried out LSDB, suspend the synchronous of other interfaces, when this interface reaches full state (a kind of synchronous state, when this state is finished, finish synchronously) after, the residue interface is sent the LSA relevant with link can realize synchronously.Owing to only need transmit the LSA relevant with link to the synchronous of residue interface, other LSA all need not transmission (because of the relevant regulations according to RFC2328 and Extended Protocol, other LSA gives the residue interface by the interface inundation that reaches at first the full state), so it is few that it has a message transmission, the advantage that volume of transmitted data is little.
Embodiment
The invention provides an embodiment, present embodiment provides a kind of ospf neighbor method for building up, and the network structure that present embodiment is realized wherein, includes RTA, RTB, RTC, RTD in the zone 1 as shown in Figure 3; Include RTE, RTF, RTG and RTA in the zone 2; In addition, it is synchronous to have finished LSDB between RTB, RTC, the RTD, and it is synchronous also to have finished LSDB between RTE, RTF, the RTG, here suppose that RTB, RTC, RTD have respectively an interface to be connected with RTA, the method that present embodiment provides is take zone 1 as example, and the method comprises as shown in Figure 4:
S41, RTA carry out synchronously at the total interface transmission hello packet of RTB, RTC and RTD;
S42, at the interface (supposing that it reaches at first) of RTB when reaching the 2Way state, it is synchronous that RTA carries out LSDB to the interface of RTB, suspends the simultaneous operation of succeeding state of the interface of RTC and RTD;
S43, after the interface of RTB reaches the full state, RTA sends database description packet (Database Description packet to RTC interface and RTD interface, DD) behind the message, the LSA that then transmission is relevant with link is synchronous with realization and RTC interface and RTD interface (namely remaining interface).
The below introduces the principle that a present embodiment is realized, because finished between RTB, RTC in the zone 1, the RTD synchronously, so RTA is need to be with the synchronisation of nodes of zone in 1 time, in zone 1, an interface (RTB interface) is arranged when having reached the full state, after RTB and RTA finish synchronously, understand RTB is gone up the information from flooding of existing RTC and RTD to RTA, certainly in actual conditions, if also have other synchronization node, RTB too can be above-mentioned other the information inundation of synchronization node to RTA so; Like this RTA and RTC and RTD between synchronously the time, only need send the LSA relevant with link, so just can reduce the quantity of LSA, minimizing data transfer amount.
Need to prove that the specific definition of above-mentioned LSA can be referring to RFC2328 agreement, RFC3620 and relative Extended Protocol.
The method that neighbours set up in zone 2 is basic identical with zone 1, and difference only is that RTB, RTC, the RTD in the zone 1 replaces to RTE, RTF, the RTG in the zone 2.
In said units and the system embodiment, included modules or unit are just divided according to function logic, but are not limited to above-mentioned division, as long as can realize corresponding function; In addition, the concrete title of each functional module also just for the ease of mutual differentiation, is not limited to protection scope of the present invention.
It will be understood by those skilled in the art that all or part of step of technical scheme that the embodiment of the invention provides is to finish by the relevant hardware of program command.Such as finishing by the computer run journey.This program can be stored in read/write memory medium, for example, and random asccess memory, disk, CD etc.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. an ospf neighbor method for building up is characterized in that, described method comprises:
Under the SPF ospf protocol, node is synchronous to carry out neighbours to all interfaces that are connected with this node transmission hello packets of other interior nodes of zone, has finished between other nodes in the described zone synchronously;
Node obtains the interface that reaches at first the 2Way state in the total interface, synchronous to this interface initiation LSD LSDB that reaches at first the 2Way state, suspend synchronous except the succeeding state of initiating the residue interface of LSDB synchronously, described succeeding state is: the state that the 2Way state is later;
After the state of the interface that reaches at first the 2Way state reached the full state, node declared that to this residue interface transmission Link State relevant with link LSA is to realize with the synchronous of residue interface and to realize that neighbours set up.
2. method according to claim 1 is characterized in that, when the interface that reaches at first the 2Way state when being a plurality of, describedly this interface that reaches at first the 2Way state is initiated LSDB specifically comprises synchronously:
It is synchronous that interface of any selection carries out LSDB from a plurality of interfaces that reach at first the 2Way state.
3. method according to claim 1 is characterized in that, the described Link State relevant with link declaration LSA specifically comprises:
No. 9 LSA and No. 1 LSA.
4. method according to claim 1, described method sends the Link State declaration LSA relevant with link to realize and to remain the synchronous of interface and realize that neighbours also comprise before setting up at node to this residue interface:
The affiliated node of interface that reaches the full state will remain the LSA inundation to the node under the described residue interface; Wherein said residue LSA comprises: except the LSA No. 9 LSA.
5. method according to claim 1 is characterized in that, described node comprises to carry out neighbours synchronously to the total interface transmission hello packet of other interior nodes of zone:
When node has new link in detecting described zone, synchronous to carry out neighbours to the total interface transmission hello packet of other interior nodes of zone.
6. method according to claim 1 is characterized in that, described method also comprises: when all links of node start or node when restarting simultaneously, total interface all can be received the hello packet that neighbor node sends.
7. a node is characterized in that, described node comprises:
Transmitting element, it is synchronous to carry out neighbours to be used for sending hello packet to the interface that is connected with this node of other interior nodes of zone, has finished between other nodes in the described zone synchronously;
Obtain the time-out unit, reach at first the interface of 2Way state for the interface that obtains other nodes, synchronous to this interface initiation LSDB that reaches at first the 2Way state, suspend except the succeeding state of initiating the residue interface of LSDB synchronous synchronously, described succeeding state is: the state that the 2Way state is later;
The residue lock unit is used for after the state of the interface that reaches at first the 2Way state reaches the full state, and node declares that to this residue interface transmission Link State relevant with link LSA is to realize with the synchronous of residue interface and to realize that neighbours set up.
8. node according to claim 7 is characterized in that, when the interface that reaches at first the 2Way state when being a plurality of, described obtaining suspended the unit and specifically be used for:
Obtain a plurality of interfaces that reach at first the 2Way state in the interface of other nodes, it is synchronous to select arbitrarily an interface to initiate LSDB from described a plurality of interfaces, suspend except the succeeding state of initiating the residue interface of LSDB synchronous synchronous.
9. node according to claim 7 is characterized in that, the described Link State relevant with link declaration LSA specifically comprises:
No. 9 LSA and No. 1 LSA.
10. node according to claim 7 is characterized in that, described node also comprises:
Detecting unit for detection of whether new link is arranged in the described zone, has consecutive hours in detecting described zone, it is synchronous to carry out neighbours to the total interface transmission hello packet of other interior nodes of zone to control described transmitting element.
11. an ospf neighbor is set up system, it is characterized in that, described system comprises: first node and other nodes;
Described first node is used under the SPF ospf protocol, and is synchronous to carry out neighbours to all interfaces that are connected with described first node transmission hello packets of other interior nodes of zone, finished between other nodes in the described zone synchronously;
Described first node also is used for obtaining the interface that total interface reaches the 2Way state at first, synchronous to this interface initiation LSD LSDB that reaches at first the 2Way state, suspend synchronous except the succeeding state of initiating the residue interface of LSDB synchronously, described succeeding state is: the state that the 2Way state is later;
After the state of the interface that reaches at first the 2Way state reaches the full state, reach the affiliated node of interface of full state, be used for remaining the LSA inundation to the node under the residue interface;
Described first node is used for declaring that to this residue interface transmission Link State relevant with link LSA is to realize with the synchronous of residue interface and to realize that neighbours set up.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2012/077627 WO2014000181A1 (en) | 2012-06-27 | 2012-06-27 | Open shortest path first based neighbor establishing method, node, and system |
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| CN103004150A true CN103004150A (en) | 2013-03-27 |
| CN103004150B CN103004150B (en) | 2015-07-08 |
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| CN103414645A (en) * | 2013-07-24 | 2013-11-27 | 北京华为数字技术有限公司 | Link status database synchronization method, controller and system |
| CN103490922A (en) * | 2013-09-10 | 2014-01-01 | 迈普通信技术股份有限公司 | Control system and method for OSPF protocol neighbor setup process |
| CN109873764A (en) * | 2019-02-21 | 2019-06-11 | 杭州迪普科技股份有限公司 | Establish method, apparatus, the electronic equipment of orientation ospf neighbor relationship |
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| CN103414645A (en) * | 2013-07-24 | 2013-11-27 | 北京华为数字技术有限公司 | Link status database synchronization method, controller and system |
| CN103414645B (en) * | 2013-07-24 | 2017-02-08 | 北京华为数字技术有限公司 | Link status database synchronization method, controller and system |
| CN103490922A (en) * | 2013-09-10 | 2014-01-01 | 迈普通信技术股份有限公司 | Control system and method for OSPF protocol neighbor setup process |
| CN103490922B (en) * | 2013-09-10 | 2017-02-08 | 迈普通信技术股份有限公司 | Control system and method for OSPF protocol neighbor setup process |
| CN109873764A (en) * | 2019-02-21 | 2019-06-11 | 杭州迪普科技股份有限公司 | Establish method, apparatus, the electronic equipment of orientation ospf neighbor relationship |
| CN109873764B (en) * | 2019-02-21 | 2021-12-24 | 杭州迪普科技股份有限公司 | Method, device and electronic equipment for establishing oriented OSPF (open shortest Path first) neighbor relation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103004150B (en) | 2015-07-08 |
| WO2014000181A1 (en) | 2014-01-03 |
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