CN105141529A - IS-IS protocol neighbor establishing method and system - Google Patents
IS-IS protocol neighbor establishing method and system Download PDFInfo
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- CN105141529A CN105141529A CN201510491403.5A CN201510491403A CN105141529A CN 105141529 A CN105141529 A CN 105141529A CN 201510491403 A CN201510491403 A CN 201510491403A CN 105141529 A CN105141529 A CN 105141529A
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- 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
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Abstract
The invention discloses an IS-IS protocol neighbor establishing method and system. The method comprises: when an intermediate system (IS) activates an interface, detecting the maximum length of a hello message that the interface is capable of sending and the maximum length of a message that an LSP or SNP of the intermediate system is capable of generating; comparing the maximum length of the hello message that the interface of the intermediate system (IS) is capable of sending with the maximum length of the message that the LSP or SNP of the intermediate system is capable of generating; and when the maximum length of the hello message that the interface of the intermediate system (IS) is capable of sending is smaller than the maximum length of the message that the LSP or SNP of the intermediate system is capable of generating, setting the interface of the intermediate system (IS) in a hello message transmission suppressing state and sending out prompting information. The IS-IS protocol neighbor establishing method is used for solving the problem that a manager cannot easily obtain the specific reason of different traffic due to the failure of transmission of LSP or SNP via the IS-IS interface in case that the maximum length of the hello message that the IS-IS interface is capable of sending is smaller than the maximum length that the LSP or SNP is capable of generating, and therefore, the manager can manage and maintain the network conveniently.
Description
Technical field
The present invention relates to field, a kind of Intermediate System to Intermediate System networking, in particular a kind of Intermediate System to Intermediate System neighbours method for building up and system.
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.
Under default situations, LSP, SNP(sequence number message of the maximum length that the hello packet of IS-IS can send and IS-IS) the message maximum length that can generate is consistent.Like this, an IS(intermediate system) when neighbours can normally set up on one interface, also one send LSP and SNP message from this interface surely.But, in some cases, such as: this IS(intermediate system) and need the link state data information noticed very large, so that need LSP, SNP(sequence number message being increased IS-IS by configuration) the message maximum length that can generate.Thus cause, IS on this interface neighbours sets up normally, but the IS on network then cannot receive the LSP message that this IS sends out, the topological sum routing iinformation of final this IS of arrival cannot be formed, thus causing the flow arriving this IS to send transmission, configuration management personnel then cannot know concrete reason information.
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 neighbours method for building up and system, eliminate when is-is interface can send hello packet maximum length be less than LSP, SNP can generate maximum length, from then on LSP, SNP cannot successfully to send and the flow that causes is different by interface, but administrative staff are difficult to the problem knowing concrete reason.
Technical scheme of the present invention is as follows:
A kind of Intermediate System to Intermediate System neighbours method for building up, is characterized in that, comprise the following steps:
A, when an intermediate system IS starts an interface, detect this interface and can send the packet maximum length that the maximum length of hello packet and described intermediate system LSP, SNP can generate;
B, contrast the packet maximum length that LSP, SNP that described intermediate system IS interface can send hello packet maximum length and described intermediate system IS can generate;
C, when described intermediate system IS interface can send LSP, SNP that hello packet maximum length is less than described intermediate system IS can generate packet maximum length time, described intermediate system IS interface is set for sending hello packet holddown, and sends information;
D, when described intermediate system IS interface can send LSP, SNP that hello packet maximum length is more than or equal to described intermediate system IS can generate packet maximum length time, described intermediate system IS interface is set and suppresses disarm state for sending hello packet, and periodically send hello packet on described intermediate system IS interface.
2. Intermediate System to Intermediate System neighbours method for building up according to claim 1, it is characterized in that, described step C specifically comprises:
C1, send hello packet holddown when described intermediate system IS interface is in, and LSP, SNP of reducing described intermediate system IS can generate maximum length message value, the maximum length that LSP, SNP of contrasting this interface transmission hello packet maximum length and described intermediate system IS can generate.
3. Intermediate System to Intermediate System neighbours method for building up according to claim 2, it is characterized in that, described step C specifically also comprises:
C2, be still less than described intermediate system ISLSO, SNP can generate packet maximum length when described intermediate system IS interface can send hello packet maximum length, then keep this interface to send hello packet holddown, and send information.
4. Intermediate System to Intermediate System neighbours method for building up according to claim 2, it is characterized in that, described step C specifically also comprises:
C3, be more than or equal to described intermediate system ISLSO, SNP can generate packet maximum length when described intermediate system IS interface can send hello packet maximum length, then this interface is set and suppresses disarm state for sending hello packet.
5. Intermediate System to Intermediate System neighbours method for building up according to claim 1, it is characterized in that, described step D specifically comprises:
D1, when described intermediate system IS interface be in send hello packet suppress disarm state, and the maximum length message that LSP, SNP of increasing described intermediate system IS can generate, the maximum length that LSP, SNP of contrasting this interface transmission hello packet maximum length and described intermediate system IS can generate.
6. Intermediate System to Intermediate System neighbours method for building up according to claim 5, it is characterized in that, described step D specifically also comprises:
D2, be still more than or equal to described intermediate system ISLSO, SNP can generate packet maximum length when described intermediate system IS interface can send hello packet maximum length, then keep this interface to send hello packet and suppress disarm state, normally send hello packet.
7. Intermediate System to Intermediate System neighbours method for building up according to claim 5, it is characterized in that, described step D specifically also comprises:
D3, be less than described intermediate system ISLSO, SNP can generate packet maximum length when described intermediate system IS interface can send hello packet maximum length, then this interface is set for sending hello packet holddown, and sends information.
8. a system for Intermediate System to Intermediate System neighbours foundation, is characterized in that, comprising:
Detection module, for when an intermediate system IS starts an interface, detects this interface and can send the packet maximum length that the maximum length of hello packet and described intermediate system LSP, SNP can generate;
Contrast module, the packet maximum length that LSP, the SNP that can send hello packet maximum length and described intermediate system IS for contrasting described intermediate system IS interface can generate;
Suppression module, when LSP, SNP of being less than described intermediate system IS for can send hello packet maximum length when described intermediate system IS interface can generate packet maximum length, described intermediate system IS interface is set for sending hello packet holddown, and sends information;
Contact modules, when LSP, SNP of being more than or equal to described intermediate system IS for can send hello packet maximum length when described intermediate system IS interface can generate packet maximum length, described intermediate system IS interface is set and suppresses disarm state for sending hello packet, and periodically send hello packet on described intermediate system IS interface.
9. the system of Intermediate System to Intermediate System neighbours foundation according to claim 1, it is characterized in that, described suppression module specifically comprises:
First suppresses unit, hello packet holddown is sent for being in when described intermediate system IS interface, and LSP, SNP of reducing described intermediate system IS can generate maximum length message value, the maximum length that LSP, SNP of contrasting this interface transmission hello packet maximum length and described intermediate system IS can generate;
Second suppresses unit, for being still less than described intermediate system ISLSO, SNP can generating packet maximum length when described intermediate system IS interface can send hello packet maximum length, then keeps this interface to send hello packet holddown, and sends information;
3rd suppresses unit, for being more than or equal to described intermediate system ISLSO, SNP can generating packet maximum length when described intermediate system IS interface can send hello packet maximum length, then arranges this interface and suppresses disarm state for sending hello packet.
10. the system of Intermediate System to Intermediate System neighbours foundation according to claim 1, it is characterized in that, described releasing module specifically comprises:
First lifting unit, hello packet suppression disarm state is sent for being in when described intermediate system IS interface, and the maximum length message that LSP, SNP of increasing described intermediate system IS can generate, the maximum length that LSP, SNP of contrasting this interface transmission hello packet maximum length and described intermediate system IS can generate;
Second lifting unit, for being still more than or equal to described intermediate system ISLSO, SNP can generating packet maximum length when described intermediate system IS interface can send hello packet maximum length, then keep this interface to send hello packet and suppress disarm state, normally send hello packet;
3rd lifting unit, for being less than described intermediate system ISLSO, SNP can generating packet maximum length when described intermediate system IS interface can send hello packet maximum length, then arranges this interface for sending hello packet holddown, and sends information.
Intermediate System to Intermediate System neighbours method for building up provided by the present invention and system, eliminate when is-is interface can send hello packet maximum length be less than LSP, SNP can generate maximum length, from then on LSP, SNP cannot successfully to send and the flow that causes is different by interface, but administrative staff are difficult to the problem knowing concrete reason, are convenient to manager and administer and maintain network.
Accompanying drawing explanation
Fig. 1 is the topological diagram of Intermediate System to Intermediate System neighbours method for building up in the present invention.
Fig. 2 is the flow chart of Intermediate System to Intermediate System neighbours method for building up in the present invention.
Embodiment
The invention provides a kind of Intermediate System to Intermediate System neighbours method for building up and system, 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. 1, Intermediate System to Intermediate System neighbours method for building up provided by the invention, comprises the following steps:
S100, when an intermediate system IS starts an interface, detect this interface and can send the packet maximum length that the maximum length of hello packet and described intermediate system LSP, SNP can generate.
Under Intermediate System to Intermediate System default situations, all hello, LSP, SNP maximum lengths that can generate of IS-IS are 1492 bytes.If need the routing iinformation sent out all to notice away, only have and maximum for LSP generation length configuration is amplified, do not use 1492 bytes of acquiescence, change larger byte into.So, when an intermediate system IS starts an interface, this interface should be detected and can send the packet maximum length that the maximum length of hello packet and described intermediate system LSP, SNP can generate.
S200, contrast the packet maximum length that LSP, SNP that described intermediate system IS interface can send hello packet maximum length and described intermediate system IS can generate.
If namely intermediate system IS interface can send LSP, SNP that hello packet maximum length is less than intermediate system IS when can generate message maximum, routing iinformation will be caused all to notice away, also just cannot calculate its topological sum routing iinformation, thus cause flow interrupt.But can only find that two intermediate system IS cannot receive LSP message by inspection, other all normal, send the LSP message reason receiving an intermediate system IS a lot, be difficult to the concrete reason determining that LSP does not receive.
S300, when described intermediate system IS interface can send LSP, SNP that hello packet maximum length is less than described intermediate system IS can generate packet maximum length time, described intermediate system IS interface is set for sending hello packet holddown, and sends information.
S400, when described intermediate system IS interface can send LSP, SNP that hello packet maximum length is more than or equal to described intermediate system IS can generate packet maximum length time, described intermediate system IS interface is set and suppresses disarm state for sending hello packet, and periodically send hello packet on described intermediate system IS interface.
As shown in Figure 1, the network topology that R1, R2 are formed, the interface 1 of R1 and the interface 2 of R2 establish the neighborhood of IS-IS.
Under Intermediate System to Intermediate System default situations, all hello, LSP, SNP maximum lengths that can generate of IS-IS are 1492 bytes.If current R1 needs the link state data information noticed very many, such as need notice to go out 100,000 routing iinformations, use the LSP of maximum 256 bursts that can generate of R1 all to notice away.At this moment, just adopt a kind of method, maximum for LSP generation length configuration is changed large, does not use 1492 bytes of acquiescence, change 7680 bytes into.But change and also there is risk greatly, if the maximum support of physics MTU MTU 5000 bytes of the interface 1 of R1, the hello packet maximum length that is this interface 1 can send is 5000.At this moment, upper LSP, SNP length according to configured length 7680 bytes generations of R1 is excessive, can not send from the interface 1 of R1.R2 so on network just cannot receive the LSP message that R1 sends, and also just cannot calculate its topological sum routing iinformation, thus causes the flow interrupt arriving R1.But by checking, can only find that R2 cannot receive the LSP message of R1, other all normal, send the LSP message reason receiving an IS a lot, be now difficult to the concrete reason determining that LSP does not receive.
After adopting the present invention.Change large in the configuration of just LSP maximum generation length, do not use 1492 bytes of acquiescence, after changing 7680 bytes into.Because the physics MTU of interface 1 is 5000, the maximum hello packet length that can send is 5000 bytes.But, because maximum length 5000 bytes that can send hello packet are less than maximum length 7680 bytes that LSP, SNP can generate, so this interface is set to send hello packet holddown, dwelling period sends hello packet, and the neighbours so between R1 and R2 cannot normally set up.Meanwhile, configuration management personnel can see prompting and neighbor state now at once, determine that the maximum generation length of adjustment LSP is 5000 bytes.At this moment, trigger the transmission of hello packet, and check: at this moment the sent maximum length 5000 of this interface hello packet is more than or equal to the maximum length 5000 that LSP, SNP can generate, then remove on this interface and send hello packet holddown, start normal periodic and send message, neighbours set up normally.The LSP message of R1 can be sent to R2 smoothly, and R2 normally can calculate the topological sum routing iinformation arriving R1, and flow also can normal transmission.
Further, in described Intermediate System to Intermediate System neighbours method for building up, described step S30 specifically comprises:
S310, send hello packet holddown when described intermediate system IS interface is in, and LSP, SNP of reducing described intermediate system IS can generate maximum length message value, the maximum length that LSP, SNP of contrasting this interface transmission hello packet maximum length and described intermediate system IS can generate;
S320, be still less than described intermediate system ISLSO, SNP can generate packet maximum length when described intermediate system IS interface can send hello packet maximum length, then keep this interface to send hello packet holddown, and send information;
S330, be more than or equal to described intermediate system ISLSO, SNP can generate packet maximum length when described intermediate system IS interface can send hello packet maximum length, this interface is then set and suppresses disarm state for sending hello packet, specifically can consult above-mentioned specific embodiment.
Further, in described Intermediate System to Intermediate System neighbours method for building up, described step S400 specifically comprises:
S410, when described intermediate system IS interface be in send hello packet suppress disarm state; and the maximum length message that LSP, SNP of increasing described intermediate system IS can generate, the maximum length that LSP, SNP of contrasting this interface transmission hello packet maximum length and described intermediate system IS can generate;
S420, be still more than or equal to described intermediate system ISLSO, SNP can generate packet maximum length when described intermediate system IS interface can send hello packet maximum length, then keep this interface to send hello packet and suppress disarm state, normally send hello packet;
S430, be less than described intermediate system ISLSO, SNP can generate packet maximum length when described intermediate system IS interface can send hello packet maximum length, this interface is then set for sending hello packet holddown, and send information, specifically can consult above-mentioned specific embodiment.
Corresponding above-mentioned Intermediate System to Intermediate System neighbours method for building up the present invention also provides Intermediate System to Intermediate System neighbours the system set up, and it comprises:
Detection module, for when an intermediate system IS starts an interface, detects this interface and can send the packet maximum length that the maximum length of hello packet and described intermediate system LSP, SNP can generate;
Contrast module, the packet maximum length that LSP, the SNP that can send hello packet maximum length and described intermediate system IS for contrasting described intermediate system IS interface can generate;
Suppression module, when LSP, SNP of being less than described intermediate system IS for can send hello packet maximum length when described intermediate system IS interface can generate packet maximum length, described intermediate system IS interface is set for sending hello packet holddown, and sends information;
Contact modules, when LSP, SNP of being more than or equal to described intermediate system IS for can send hello packet maximum length when described intermediate system IS interface can generate packet maximum length, described intermediate system IS interface is set and suppresses disarm state for sending hello packet, and periodically hello packet is sent on described intermediate system IS interface, as detailed above.
In the system that described Intermediate System to Intermediate System neighbours set up, described suppression module specifically comprises:
First suppresses unit, hello packet holddown is sent for being in when described intermediate system IS interface, and LSP, SNP of reducing described intermediate system IS can generate maximum length message value, the maximum length that LSP, SNP of contrasting this interface transmission hello packet maximum length and described intermediate system IS can generate;
Second suppresses unit, for being still less than described intermediate system ISLSO, SNP can generating packet maximum length when described intermediate system IS interface can send hello packet maximum length, then keeps this interface to send hello packet holddown, and sends information;
3rd suppresses unit, for being more than or equal to described intermediate system ISLSO, SNP can generating packet maximum length when described intermediate system IS interface can send hello packet maximum length, this interface is then set and suppresses disarm state for sending hello packet, as detailed above.
In the system that described Intermediate System to Intermediate System neighbours set up, described releasing module specifically comprises:
First lifting unit, hello packet suppression disarm state is sent for being in when described intermediate system IS interface, and the maximum length message that LSP, SNP of increasing described intermediate system IS can generate, the maximum length that LSP, SNP of contrasting this interface transmission hello packet maximum length and described intermediate system IS can generate;
Second lifting unit, for being still more than or equal to described intermediate system ISLSO, SNP can generating packet maximum length when described intermediate system IS interface can send hello packet maximum length, then keep this interface to send hello packet and suppress disarm state, normally send hello packet;
3rd lifting unit, for being less than described intermediate system ISLSO, SNP can generating packet maximum length when described intermediate system IS interface can send hello packet maximum length, this interface is then set for sending hello packet holddown, and sends information, as detailed above.
In sum, the present invention is on an interface of an intermediate system IS, when sending hello packet, find that interface can send hello packet maximum length and be less than the maximum length that LSP, SNP can generate, just stop sending hello packet on this interface and providing prompting, thus affect the foundation of neighbours.Eliminate when is-is interface can send hello packet maximum length be less than LSP, SNP can generate maximum length, from then on LSP, SNP cannot successfully to send and the flow that causes is different by interface, but administrative staff are difficult to the problem knowing concrete reason, are convenient to manager and administer and maintain network.
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. an Intermediate System to Intermediate System neighbours method for building up, is characterized in that, comprises the following steps:
A, when an intermediate system IS starts an interface, detect this interface and can send the packet maximum length that the maximum length of hello packet and described intermediate system LSP, SNP can generate;
B, contrast the packet maximum length that LSP, SNP that described intermediate system IS interface can send hello packet maximum length and described intermediate system IS can generate;
C, when described intermediate system IS interface can send LSP, SNP that hello packet maximum length is less than described intermediate system IS can generate packet maximum length time, described intermediate system IS interface is set for sending hello packet holddown, and sends information;
D, when described intermediate system IS interface can send LSP, SNP that hello packet maximum length is more than or equal to described intermediate system IS can generate packet maximum length time, described intermediate system IS interface is set and suppresses disarm state for sending hello packet, and periodically send hello packet on described intermediate system IS interface.
2. Intermediate System to Intermediate System neighbours method for building up according to claim 1, it is characterized in that, described step C specifically comprises:
C1, send hello packet holddown when described intermediate system IS interface is in, and LSP, SNP of reducing described intermediate system IS can generate maximum length message value, the maximum length that LSP, SNP of contrasting this interface transmission hello packet maximum length and described intermediate system IS can generate.
3. Intermediate System to Intermediate System neighbours method for building up according to claim 2, it is characterized in that, described step C specifically also comprises:
C2, be still less than described intermediate system ISLSO, SNP can generate packet maximum length when described intermediate system IS interface can send hello packet maximum length, then keep this interface to send hello packet holddown, and send information.
4. Intermediate System to Intermediate System neighbours method for building up according to claim 2, it is characterized in that, described step C specifically also comprises:
C3, be more than or equal to described intermediate system ISLSO, SNP can generate packet maximum length when described intermediate system IS interface can send hello packet maximum length, then this interface is set and suppresses disarm state for sending hello packet.
5. Intermediate System to Intermediate System neighbours method for building up according to claim 1, it is characterized in that, described step D specifically comprises:
D1, when described intermediate system IS interface be in send hello packet suppress disarm state, and the maximum length message that LSP, SNP of increasing described intermediate system IS can generate, the maximum length that LSP, SNP of contrasting this interface transmission hello packet maximum length and described intermediate system IS can generate.
6. Intermediate System to Intermediate System neighbours method for building up according to claim 5, it is characterized in that, described step D specifically also comprises:
D2, be still more than or equal to described intermediate system ISLSO, SNP can generate packet maximum length when described intermediate system IS interface can send hello packet maximum length, then keep this interface to send hello packet and suppress disarm state, normally send hello packet.
7. Intermediate System to Intermediate System neighbours method for building up according to claim 5, it is characterized in that, described step D specifically also comprises:
D3, be less than described intermediate system ISLSO, SNP can generate packet maximum length when described intermediate system IS interface can send hello packet maximum length, then this interface is set for sending hello packet holddown, and sends information.
8. a system for Intermediate System to Intermediate System neighbours foundation, is characterized in that, comprising:
Detection module, for when an intermediate system IS starts an interface, detects this interface and can send the packet maximum length that the maximum length of hello packet and described intermediate system LSP, SNP can generate;
Contrast module, the packet maximum length that LSP, the SNP that can send hello packet maximum length and described intermediate system IS for contrasting described intermediate system IS interface can generate;
Suppression module, when LSP, SNP of being less than described intermediate system IS for can send hello packet maximum length when described intermediate system IS interface can generate packet maximum length, described intermediate system IS interface is set for sending hello packet holddown, and sends information;
Contact modules, when LSP, SNP of being more than or equal to described intermediate system IS for can send hello packet maximum length when described intermediate system IS interface can generate packet maximum length, described intermediate system IS interface is set and suppresses disarm state for sending hello packet, and periodically send hello packet on described intermediate system IS interface.
9. the system of Intermediate System to Intermediate System neighbours foundation according to claim 1, it is characterized in that, described suppression module specifically comprises:
First suppresses unit, hello packet holddown is sent for being in when described intermediate system IS interface, and LSP, SNP of reducing described intermediate system IS can generate maximum length message value, the maximum length that LSP, SNP of contrasting this interface transmission hello packet maximum length and described intermediate system IS can generate;
Second suppresses unit, for being still less than described intermediate system ISLSO, SNP can generating packet maximum length when described intermediate system IS interface can send hello packet maximum length, then keeps this interface to send hello packet holddown, and sends information;
3rd suppresses unit, for being more than or equal to described intermediate system ISLSO, SNP can generating packet maximum length when described intermediate system IS interface can send hello packet maximum length, then arranges this interface and suppresses disarm state for sending hello packet.
10. the system of Intermediate System to Intermediate System neighbours foundation according to claim 1, it is characterized in that, described releasing module specifically comprises:
First lifting unit, hello packet suppression disarm state is sent for being in when described intermediate system IS interface, and the maximum length message that LSP, SNP of increasing described intermediate system IS can generate, the maximum length that LSP, SNP of contrasting this interface transmission hello packet maximum length and described intermediate system IS can generate;
Second lifting unit, for being still more than or equal to described intermediate system ISLSO, SNP can generating packet maximum length when described intermediate system IS interface can send hello packet maximum length, then keep this interface to send hello packet and suppress disarm state, normally send hello packet;
3rd lifting unit, for being less than described intermediate system ISLSO, SNP can generating packet maximum length when described intermediate system IS interface can send hello packet maximum length, then arranges this interface for sending hello packet holddown, and sends information.
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| CN110692268A (en) * | 2017-01-25 | 2020-01-14 | 无线通信与技术公司 | Island topology and routing in hybrid mesh networks |
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Application publication date: 20151209 |