CN107948065A - A kind of link-state information acquisition methods and device - Google Patents
A kind of link-state information acquisition methods and device Download PDFInfo
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- CN107948065A CN107948065A CN201711480361.0A CN201711480361A CN107948065A CN 107948065 A CN107948065 A CN 107948065A CN 201711480361 A CN201711480361 A CN 201711480361A CN 107948065 A CN107948065 A CN 107948065A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
- H04L45/04—Interdomain routing, e.g. hierarchical routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
- H04L63/083—Network architectures or network communication protocols for network security for authentication of entities using passwords
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/30—Network architectures or network communication protocols for network security for supporting lawful interception, monitoring or retaining of communications or communication related information
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Abstract
The application provides a kind of link-state information acquisition methods, it is characterised in that and the method is applied to the either router in Intermediate System-to-Intermediate System network, the described method includes：In the case of the Link State Packet domain authentification failure received, according to the Link State Packet of domain authentification failure, corresponding partial order row number message is assembled；The partial order row number message of assembling is sent to neighbor router, to notify the router of the Link State Packet of sending domain authentification failure, based on its current domain authentication password, resends Link State Packet；The Link State Packet resend is received, and carries out domain certification；In the case of the Link State Packet domain certification received is successful, the link-state information in the Link State Packet received is obtained.Using application scheme, in the case where not causing route oscillation other routers can be notified to resend Link State Packet, so as to obtain link-state information therein.
Description
Technical field
This application involves field of communication technology, more particularly to a kind of link-state information acquisition methods and device.
Background technology
Based on ISIS (Intermediate System-to-Intermediate System, intermediate system to centre
System) agreement ISIS networks in, the generation of each router simultaneously sends LSP ((Link State PDU, link state to the whole network
Protocol massages), the link-state informations such as oneself neighbor router, Linktype and bandwidth are announced, and receive other routes
The LSP messages of device, to know the link-state information between other routers.Each router needs after LSP messages are received
Domain certification is carried out to LSP messages according to preconfigured domain authentication password, the LSP messages that certification passes through will be stored into LSDB
In (Link State Data Base, Link State Database), and routing forwarding is calculated according to link-state information therein
Path.Each router can be by, including in LSDB all link-state informations summaries CSNP (Complete
Sequence Number PDU, full sequence numbers message), the synchronization of LSDB between different routers is maintained, and pass through PSNP
The link state that (Partial Sequence Number PDU, partial order row number message) confirms or request local LSDB lacks
Information.
The each LSP messages sent and received in ISIS networks carry life span, so as to timely aging, remove respectively
Old or invalid link-state information in LSDB.For the either router in network, after new domain authentication password is configured,
When receiving the LSP messages that end-to-end router after aging is resend, if end-to-end router does not configure same new password, example
Such as the domain authentication password mistake of this configuration of routers, it will the situation of authentication failed occur.In order to obtain correct link state
Information, is usually that the remaining life span of the LSP messages of authentification failure is set to 0 by local terminal router in the prior art, and is led to
The forwarding for crossing neighbor router is published in the whole network, to notify the end-to-end router LSP messages aging, and makes opposite end
Router resends LSP messages to local terminal router, if local terminal router is changed to correct password during this period, weighs
The LSP messages newly sent can be preserved the link-state information of acquisition to the LSDB of local terminal by domain certification.But this
After the information of the LSP messages aging is published in the whole network by end router, other each routers will delete the LSP messages, and
Within a period of time before receiving new LSP messages, routed path is recalculated, this will cause the route oscillation of network,
I.e. when in network a certain router be configured with different domain authentication passwords from other either routers, it would be possible to cause network to route
Concussion.
The content of the invention
In view of this, the application provides a kind of link-state information acquisition methods and device, technical solution are as follows：
A kind of link-state information acquisition methods, it is characterised in that the method is applied to Intermediate System-to-Intermediate System
Either router in network, the described method includes：
In the case of the Link State Packet domain authentification failure received, according to the link state report of domain authentification failure
Text, assembles corresponding partial order row number message；
The partial order row number message of assembling is sent to neighbor router, to notify the link state of sending domain authentification failure
The router of message, based on its current domain authentication password, resends Link State Packet；
The Link State Packet resend is received, and carries out domain certification；
In the case of the Link State Packet domain certification received is successful, obtain in the Link State Packet received
Link-state information.
A kind of link-state information acquisition device, it is characterised in that described device is applied to Intermediate System-to-Intermediate System
Either router in network, described device include：
Message assembles module, in the case of the Link State Packet domain authentification failure received, according to domain certification
The Link State Packet of failure, assembles corresponding partial order row number message；
Message sending module, for sending the partial order row number message of assembling to neighbor router, to notify sending domain
The router of the Link State Packet of authentification failure, based on its current domain authentication password, resends Link State Packet；
Message receiving module, for receiving the Link State Packet resend, and carries out domain certification；
Data obtaining module, in the case of the Link State Packet domain certification received is successful, acquisition to receive
Link State Packet in link-state information.
Technical solution provided herein, for the LSP messages of authentification failure, does not announce the LSP messages in a network
Aging, but end-to-end router is directly required by PSNP messages, LSP messages are resend, if local terminal and other routes
The domain authentication password of device is unified, then the LSP resend will not authentification failure, can from wherein obtaining link-state information,
And it will not result in network route oscillation.
It should be appreciated that the general description and following detailed description of the above are only exemplary and explanatory, not
The application can be limited.In addition, any embodiment in the application and above-mentioned whole effects need not be reached.
Brief description of the drawings
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments described in application, for those of ordinary skill in the art, can also obtain other according to these attached drawings
Attached drawing.
Fig. 1 is the flow diagram of the embodiment of the present application link-state information acquisition methods；
Fig. 2 is the first structure diagram of the embodiment of the present application link-state information acquisition device；
Fig. 3 is the structure diagram of the embodiment of the present application message assembling module；
Fig. 4 is second of structure diagram of the embodiment of the present application link-state information acquisition device；
Fig. 5 is the third structure diagram of the embodiment of the present application link-state information acquisition device.
Embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Following description is related to
During attached drawing, unless otherwise indicated, the same numbers in different attached drawings represent the same or similar key element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the application.On the contrary, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects be described in detail in claims, the application.
It is only merely for the purpose of description specific embodiment in term used in this application, and is not intended to be limiting the application.
It is also intended in the application and " one kind " of singulative used in the attached claims, " described " and "the" including majority
Form, unless context clearly shows that other implications.It is also understood that term "and/or" used herein refers to and wraps
Containing the associated list items purpose of one or more, any or all may be combined.
ISIS agreements are a kind of widely applied network routing protocols, applied to the router in the network of operation ISIS.
Based on the ISIS agreements, router usually requires to determine routing forwarding path by 4 steps, and 4 steps are respectively：
The foundation of syntople and maintenance, the generation of LSP messages, the diffusion of LSP and synchronous, router-level topology.In ISIS networks, complete adjacent
After each router generation LSP messages for occupying relation foundation, by the mutual forwarding between mutual neighbor router, make network
Other interior routers receive the LSP messages of itself, so as to announce the link shape such as itself neighbor router and Linktype
State information.
Router in network will carry preconfigured domain authentication password, together when sending the LSP messages of itself generation
Router in one ISIS networks should configure unified domain authentication password.Other routers are after LSP messages are received, by basis
Preconfigured domain authentication password carries out domain certification to LSP messages, can if the domain certification success of the LSP messages received
Certification successful LSP messages in domain are stored in LSDB, and routing forwarding path is calculated using link-state information therein.
In a certain router, if the domain authentification failure of the LSP messages received, the router will notify other roads
By the device LSP messages aging, so that the router for sending the LSP messages regenerates and sends LSP messages.But at the same time other
Each router will delete the LSP messages, and within a period of time before receiving new LSP messages, recalculate route road
Footpath, this will cause the route oscillation of network.Therefore, when the router in network uniformly changes domain authentication password, and different roads
It is poor by the change existence time of device, or the configuration of routers of some new access ISIS network domain authentication password it is incorrect when,
When will likely cause the LSP messages domain authentification failure in the router, and then network route oscillation may be caused.On solving
Problem is stated, makes the router for the above situation occur, in the case where not causing network concussion, notify other routers to resend
LSP, so as to obtain link-state information, the application provides a kind of link-state information acquisition methods, and this method can be applied to
Either router in Intermediate System-to-Intermediate System network, shown in Figure 1, this method may comprise steps of：
S101, in the case of the Link State Packet domain authentification failure received, according to the link shape of domain authentification failure
State message, assembles corresponding partial order row number message；
S102, the partial order row number message of assembling is sent to neighbor router, to notify the chain of sending domain authentification failure
The router of line state message, based on its current domain authentication password, resends Link State Packet；
S103, receives the Link State Packet resend, and carries out domain certification；
S104, in the case of the Link State Packet domain certification received is successful, obtains the link state report received
Link-state information in text.
Application scheme is in the Link State Packet domain authentification failure received, by directly according to domain authentification failure
LSP messages assemble corresponding PSNP messages, and are published to the whole network by the forwarding of neighbor router, to notify sending domain certification to lose
The router of the LSP messages lost, resends the LSP messages for carrying router the current field authentication password.When receiving again
After the LSP messages of transmission, domain certification is carried out to LSP messages again.
Router in ISIS networks will carry the domain authentication password of this router, other roads when sending PSNP messages
When receiving the PSNP messages by device, the domain authentication password wherein carried will be authenticated, if password is correct, will proceeded to respond to
The request of PSNP messages.Therefore, if in the router before the PSNP messages of this router transmission are received, this router
Or the domain authentication password of the router is reconfigured and unifies, then the router is by the request in PSNP messages, again
LSP messages are sent, and the LSP messages resend will be in this router domain certification success, and this router can be according to again
The LSP Receive message link-state informations of transmission, i.e. S104 can also be by the successful LSP packet storages of domain certification in router
It is local.
But if the domain authentication password of this router and the router is not still reconfigured, or this route
The domain authentication password disunity of the domain authentication password configuration error of device, i.e. this router and the router, then the router will not
The request in the PSNP messages of this router transmission can be responded, in order to wait the domain authentication password quilt of this router or the router
Reconfigure and then uniformly, therefore, in a kind of embodiment of the application, can be terminated in default wait in duration,
Timing cycle sends PSNP messages, and monitors the domain certification waiting time after the Link State Packet domain authentification failure received.
For example, it can be set to every 30 seconds send a PSNP message, circulate 2 minutes altogether, if in 2 minutes, the domain in ISIS networks
Authentication password is unified, then the PSNP messages that this router is sent will be responded, and receive what other routers were resend
LSP messages, it is clear that the LSP messages will be in this router domain certification success.And if PSNP messages within a period of time all the time not
Responded, then need to solve there may be other problems, constantly repeat PSNP messages transmitting-receiving and router to PSNP
The domain certification of message, it would be possible to the waste of Internet resources and route resource is caused, therefore, if the Link State Packet received
Exceed certain duration after the authentification failure of domain, do not receive the LSP messages that other routers are resend yet, also stop timing and follow
Ring sends assembled PSNP messages.Specific duration statistic processes can be accomplished in several ways, for example, can be to LSP
Message and its domain certification waiting time record, etc., and the basic scheme of the application is not required to be defined this in theory, this
The technical staff in field can neatly select suitable mode in practical application.
Domain authentication password configuration error for this router being likely to occur, thus with other routers in network
The inconsistent situation of domain authentication password, in a kind of embodiment of the application, in the Link State Packet received
In the case of the authentification failure of domain, domain certification further can be carried out to the LSP messages received and stored before, i.e., traveled through again
The LSP messages that domain certification is locally stored, determine the LSP messages of domain authentification failure.Due in the LSP messages that are locally stored before,
The generation of this router is further included, includes the LSP messages of the link-state information of this router, and these LSP messages are bases
In domain authentication password before, it is also possible to fail in current domain certification, therefore during for domain certification again failure LSP reports
Text, can remove wherein locally generated LSP messages, according to the LSP messages of non-local generation, assemble corresponding partial sequence
Number message is sent to neighbor router.
It is understood that application scheme can be applied to the either router in ISIS networks in theory, therefore, when
Either router in ISIS networks receive it is being sent by neighbor router, generated by the neighbor router or other routers
PSNP messages when, if the domain authentication password carried in PSNP messages is correct, will be checked further responsive to the PSNP messages
Wherein ask the LSP messages resend, if there is the LSP messages generated by this router, and if so, needing again
Send corresponding LSP messages, and regardless of whether need to resend LSP messages, the PSNP messages can be forwarded to neighbour
Router is occupied, so that the router of the whole network can receive the PSNP messages by the forwarding of neighbor router.
Corresponding to above method embodiment, the application also provides a kind of link-state information acquisition device, referring to Fig. 2 institutes
Show, which can include：
Message assembles module 110, in the case of the Link State Packet domain authentification failure received, being recognized according to domain
The Link State Packet of failure is demonstrate,proved, assembles corresponding partial order row number message；
Message sending module 120, for sending the partial order row number message of assembling to neighbor router, to notify to send
The router of the Link State Packet of domain authentification failure, based on its current domain authentication password, resends Link State Packet；
Message receiving module 130, for receiving the Link State Packet resend, and carries out domain certification；
Data obtaining module 140, in the case of the Link State Packet domain certification received is successful, obtaining and receiving
To Link State Packet in link-state information.
Shown in Figure 3 in a kind of embodiment of the application, described device can also include：
Duration statistical module 150, in the case of the Link State Packet domain authentification failure received, being connect to this
Received Link State Packet, carries out domain certification waiting time statistics；
Duration monitoring modular 160, for monitoring the domain certification waiting time of this Link State Packet received, if
Duration is terminated more than default wait；
The message sending module, is additionally operable to timing cycle and sends assembled corresponding part sequence number message, and is connecing
Received the Link State Packet domain certification success resend or the domain certification of this Link State Packet received wait
In the case that duration exceedes default wait termination duration, stop sending assembled corresponding part sequence number message.
Shown in Figure 4 in a kind of embodiment of the application, the message assembles module 110, can wrap
Include：
Message authentication unit 111, in the case of the Link State Packet domain authentification failure received, traveling through again
The Link State Packet that domain certification is locally stored, determines the Link State Packet of domain authentification failure；
Message judging unit 112, for the Link State Packet for identified any domain authentification failure, judges the report
Whether text is locally generated；
Message module units 113, for the Link State Packet according to the domain authentification failure for judging non-local generation, assembling
Corresponding partial order row number message.
Shown in Figure 5 in a kind of embodiment of the application, described device can also include：
Message removing module 170, for from the Link State Packet being locally stored, the domain for judging non-local generation to be recognized
The Link State Packet of card failure is deleted.
Command reception module 180, for when receiving domain authenticated configuration instruction, generation to be recognized with included domain in instruction
Demonstrate,prove the Link State Packet of password；
Message replacement module 190, for the Link State Packet using generation, replaces this router generation being locally stored
Link State Packet.
It is understood that message removing module 170 is used as two kinds with command reception module 180, message replacement module 190
The module of functional independence, both can as shown in Figure 5 at the same time configuration in a device, can also individually configure in a device, because
Structure shown in this Fig. 5 should not be construed as the restriction to application scheme.
The function of unit and effect realizes that process specifically refers to step is corresponded in the above method in above device
Realize process, details are not described herein.
For device embodiment, since it corresponds essentially to embodiment of the method, so related part is real referring to method
Apply the part explanation of example.Device embodiment described above is only schematical, wherein described be used as separating component
The unit of explanation may or may not be physically separate, can be as the component that unit is shown or can also
It is not physical location, you can with positioned at a place, or can also be distributed in multiple network unit.Can be according to reality
Need to select some or all of module therein to realize the purpose of application scheme.Those of ordinary skill in the art are not paying
In the case of going out creative work, you can to understand and implement.
Although this specification includes many specific implementation details, these are not necessarily to be construed as the model for limiting any invention
Enclose or scope claimed, and be primarily used for describing the feature of the specific embodiment of specific invention.In this specification
Some features described in multiple embodiments can also be combined implementation in single embodiment.On the other hand, in single implementation
Various features described in example can also be in various embodiments performed separately or be implemented with any suitable sub-portfolio.This
Outside, although feature can work in some combinations and even initially so be claimed as described above, institute is come from
One or more of claimed combination feature can be removed from the combination in some cases, and claimed
Combination can be directed toward the modification of sub-portfolio or sub-portfolio.
Similarly, although depicting operation in the accompanying drawings with particular order, this is understood not to require these behaviour
Make to perform with shown particular order or sequentially carry out or require the operation of all illustrations to be performed, to realize desired knot
Fruit.In some cases, it may be advantageous for multitask and parallel processing.In addition, the various system modules in above-described embodiment
Separation with component is understood not to be required to such separation in all embodiments, and it is to be understood that described
Program assembly and system can be usually integrated in single software product together, or be packaged into multiple software product.
Thus, the specific embodiment of theme has been described.Other embodiment is within the scope of the appended claims.
In some cases, the action described in claims can be executed in different order and still realize desired result.This
Outside, the processing described in attached drawing and nonessential shown particular order or sequential order, to realize desired result.In some realities
In existing, it may be advantageous for multitask and parallel processing.
The foregoing is merely the preferred embodiment of the application, not limiting the application, all essences in the application
God and any modification, equivalent substitution, improvement and etc. within principle, done, should be included within the scope of the application protection.
Claims (10)
1. a kind of link-state information acquisition methods, it is characterised in that the method is applied to Intermediate System-to-Intermediate System net
Either router in network, the described method includes：
In the case of the Link State Packet domain authentification failure received, according to the Link State Packet of domain authentification failure, group
Fill corresponding partial order row number message；
The partial order row number message of assembling is sent to neighbor router, to notify the Link State Packet of sending domain authentification failure
Router, based on its current domain authentication password, resend Link State Packet；
The Link State Packet resend is received, and carries out domain certification；
In the case of the Link State Packet domain certification received is successful, the link in the Link State Packet received is obtained
Status information.
2. according to the method described in claim 1, it is characterized in that, the method further includes：
In the case of the Link State Packet domain authentification failure received, to the Link State Packet that this is received, carry out
Domain certification waiting time counts；
Monitor the domain certification waiting time of this Link State Packet received, if terminate duration more than default wait；
Timing cycle sends assembled corresponding part sequence number message, and in the Link State Packet resend received
The domain certification waiting time of domain certification success or this Link State Packet received exceedes the default feelings for waiting and terminating duration
Under condition, stop sending assembled corresponding part sequence number message.
3. method according to claim 1 or 2, it is characterised in that described in the Link State Packet domain certification received
In the case of failure, according to the Link State Packet of authentification failure, corresponding partial order row number message is assembled, including：
In the case of the Link State Packet domain authentification failure received, the link state that domain certification is locally stored is traveled through again
Message, determines the Link State Packet of domain authentification failure；
For the Link State Packet of identified any domain authentification failure, judge whether the message is locally generated；
According to the Link State Packet for the domain authentification failure for judging non-local generation, corresponding partial order row number message is assembled.
4. according to the method described in claim 3, it is characterized in that, the method further includes：
From the Link State Packet being locally stored, the Link State Packet for the domain authentification failure for judging non-local generation is deleted
Remove.
5. according to the method described in claim 3, it is characterized in that, the method further includes：
When receiving domain authenticated configuration instruction, Link State Packet of the generation with included domain authentication password in instruction；
Using the Link State Packet of generation, this router generation Link State Packet being locally stored is replaced.
6. a kind of link-state information acquisition device, it is characterised in that described device is applied to Intermediate System-to-Intermediate System net
Either router in network, described device include：
Message assembles module, in the case of the Link State Packet domain authentification failure received, according to domain authentification failure
Link State Packet, assemble corresponding partial order row number message；
Message sending module, for sending the partial order row number message of assembling to neighbor router, to notify sending domain certification
The router of the Link State Packet of failure, based on its current domain authentication password, resends Link State Packet；
Message receiving module, for receiving the Link State Packet resend, and carries out domain certification；
Data obtaining module, in the case of the Link State Packet domain certification received is successful, obtaining the chain received
Link-state information in line state message.
7. device according to claim 6, it is characterised in that described device further includes：
Duration statistical module, in the case of the Link State Packet domain authentification failure received, being received to this
Link State Packet, carries out domain certification waiting time statistics；
Duration monitoring modular, for monitoring the domain certification waiting time of this Link State Packet received, if more than pre-
Duration is terminated if waiting；
The message sending module, is additionally operable to timing cycle and sends assembled corresponding part sequence number message, and is receiving
The Link State Packet domain certification resend success or this Link State Packet received domain certification waiting time
In the case of terminating duration more than default wait, stop sending assembled corresponding part sequence number message.
8. the device according to claim 6 or 7, it is characterised in that the message assembles module, including：
Message authentication unit, in the case of the Link State Packet domain authentification failure received, traveling through domain certification again
The Link State Packet being locally stored, determines the Link State Packet of domain authentification failure；
Whether message judging unit, for the Link State Packet for identified any domain authentification failure, judge the message
It is locally generated；
Message module units, it is corresponding for the Link State Packet according to the domain authentification failure for judging non-local generation, assembling
Partial order row number message.
9. device according to claim 8, it is characterised in that described device further includes：
Message removing module, for from the Link State Packet being locally stored, will judge the domain authentification failure of non-local generation
Link State Packet delete.
10. device according to claim 8, it is characterised in that described device further includes：
Command reception module, for when receiving domain authenticated configuration instruction, generation to be with included domain authentication password in instruction
Link State Packet；
Message replacement module, for the Link State Packet using generation, replaces this router generation link shape being locally stored
State message.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20220021685A1 (en) * | 2019-04-02 | 2022-01-20 | Ciena Corporation | Enhancement to the IS-IS protocol for eliminating unwanted network traffic |
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