CN104518893A - Method and device for positioning key nodes and links in IGP (Interior Gateway Protocol) topology of large-scale IP network - Google Patents

Abstract

The invention discloses a method and device for positioning key nodes and links in the IGP topology of a large-scale IP network and belongs to the IP network management and control technical field. The method comprises the following steps that: a whole-network IGP topology and a routing table are obtained; the normalized betweenness centrality of a router or a link is calculated; and the key nodes and links in the IGP topology are determined according to the normalized betweenness centrality of the router or the link. According to the method and device, the importance of all links and nodes in the IGP topology are dynamically evaluated from the whole network through quantitative evaluation indexes, and therefore, network management personnel can be assisted to quickly and accurately position the key nodes and links in the IGP topology and IGP routing relationship anomalies which may exist possibly.

Description

Key node link circuit positioning method and device in Large IP Network IGP topology

Technical field

The present invention relates to Large IP Network management control technique field, particularly key node link circuit positioning method and device in a kind of Large IP Network IGP topology.

Background technology

IGP(Interior Gateway Protocol, Interior Gateway Protocol) be used for exchanging routing information between an autonomous system (Autonomous System, AS) each node inner.At present, how to portray and analyze IGP agreement and change impact one of important content becoming network management that network is caused.Network failure or dilatation adjustment all can cause the change of IGP annexation between network node, in order to better supervising the network, operation maintenance personnel needs to grasp each node and the status of link residing in IGP topological relation in time, and assesses and anticipation the topological relation that may occur is abnormal.Traditional IP network management system mainly passes through SNMP(Simple Network ManagementProtocol to the way to manage of IGP, Simple Network Management Protocol)) read IGP information or collect & route device syslog in router mib (management information base) storehouse and find interruption or the vibration of IGP agreement, this mode triggered based on event cannot be weighed link/node from overall network angle and lose efficacy, and also cannot assess the impact that localized routing fault causes the whole network IGP routing convergence.

Although be in Route Explorer route analysis system that leading Packet Design company of the U.S. produces to have one's own knack in the real-time analysis of IGP message and dynamically representing of IGP topological relation in routing management, but still lack effective location and the assessment of the importance in IGP topology to link in network and node.

Summary of the invention

The present inventor finds to have problems in above-mentioned prior art, and therefore proposes a kind of new technical scheme at least one problem in described problem.

An object of the present invention is to provide a kind of technical scheme for key node link location in Large IP Network IGP topology.

According to a first aspect of the invention, provide key node link circuit positioning method in a kind of Large IP Network IGP topology, comprising:

Obtain whole network IGP topological sum routing table;

The Intermediate System-to-Intermediate System ISIS shortest path entry sum of equal value σ of router i to router j is calculated according to whole network routing table _ij;

For any one router in whole network or link l:

Obtain from router i to the router of process or the number of times σ of link l the ISIS of router j shortest path of equal value _ij(l);

Calculate the normalization betweenness of router or link l:

$B_l=\frac{b_l}{\max b_l}=\frac{{\mathrm{\Σ}}_{\mathrm{ij}}{\mathrm{\σ}}_{\mathrm{ij}}\left(l\right)/{\mathrm{\σ}}_{\mathrm{ij}}}{N\×(N-1)}$

Wherein, N represents the sum of router in whole network;

Normalization betweenness according to router or link l determines key node and link in IGP topology.

Alternatively, obtain whole network IGP topological sum routing table to comprise:

SNMP fetch equipment management information base MIB storehouse obtains whole network IGP topological sum routing table;

Or,

From the configuration file of equipment, obtain the IGP metric of link thus obtain whole network IGP topological sum routing table;

Or,

NM server and the network equipment set up IGP neighbours, receiving link status bag thus obtain whole network IGP topological sum routing table.

Alternatively, NM server and the network equipment set up IGP neighbours, receiving link status bag LSP thus obtain whole network IGP topological sum routing table and comprise:

NM server and backbone routers set up IGP neighborhood, receive backbone network IGP Link State bag, obtain the ISIS metric value of link between P, calculate and store complete IGP topological sum routing table in real time.

Alternatively, determine that in IGP topology, key node and link comprise according to the betweenness of router or link l:

By the router of whole network and link according to betweenness value B _lsort from big to small, using router large for betweenness value and link as key node and link in IGP topology.

Alternatively, the method also comprises: determine betweenness value and the unmatched node of topology location and link, thus determine abnormal nodes and link.

According to a further aspect in the invention, key node link positioner in a kind of Large IP Network Interior Gateway Protocol IGP topology is provided, comprises:

The whole network route acquisition module, for obtaining whole network IGP topological sum routing table;

Betweenness value determination module, for for any one router in whole network or link l:

The Intermediate System-to-Intermediate System ISIS shortest path entry sum of equal value σ of router i to router j is calculated according to whole network routing table _ij;

Obtain from router i to the router of process or the number of times σ of link l the ISIS of router j shortest path of equal value _ij(l);

Calculate the normalization betweenness of router or link l:

$B_l=\frac{b_l}{\max b_l}=\frac{{\mathrm{\Σ}}_{\mathrm{ij}}{\mathrm{\σ}}_{\mathrm{ij}}\left(l\right)/{\mathrm{\σ}}_{\mathrm{ij}}}{N\×(N-1)}$

Wherein, N represents the sum of router in whole network;

Key point determination module, for determining key node and link in IGP topology according to the normalization betweenness of router or link l.

Alternatively, the whole network route acquisition module obtains whole network IGP topological sum routing table by fetch equipment management information base MIB storehouse;

Or,

From the configuration file of equipment, obtain the IGP metric of link thus obtain whole network IGP topological sum routing table;

Or,

IGP neighbours are set up, receiving link status bag thus obtain whole network IGP topological sum routing table with the network equipment.

Alternatively, the whole network route acquisition module and backbone routers set up IGP neighborhood, receive backbone network IGP Link State bag, obtain the ISIS metric value of link between P, calculate and store complete IGP topological sum routing table in real time.

Alternatively, key point determination module by the router of whole network and link according to betweenness value B _lsort from big to small, using router large for betweenness value and link as key node and link in IGP topology.

Alternatively, this device also comprises: abnormity point determination module, for determining betweenness value and the unmatched node of topology location and link thus determining abnormal nodes and link.

An advantage of the present invention is, by the betweenness of computing network interior joint and link, for realize Large IP Network topology link and node importance judge important foundation is provided, the localization method reliability of this key node and link is high, can locate key node and link in IGP topology fast and accurately.

By referring to the detailed description of accompanying drawing to exemplary embodiment of the present invention, further feature of the present invention and advantage thereof will become clear.

Accompanying drawing explanation

What form a part for specification drawings describes embodiments of the invention, and together with the description for explaining principle of the present invention.

With reference to accompanying drawing, according to detailed description below, clearly the present invention can be understood, wherein:

Fig. 1 illustrates the flow chart according to an embodiment of the localization method of key node link in Large IP Network IGP topology of the present invention.

Fig. 2 illustrates that IP network pipe IGP route snapshot selects the schematic diagram at interface.

Fig. 3 illustrates that certain large-scale operator IP comprehensive network management is to the rank of Large IP Network IGP topology interior joint betweenness and numeric distribution curve.

Fig. 4 illustrates that certain large-scale operator IP comprehensive network management is to the rank of Large IP Network IGP topology link betweenness and numeric distribution curve.

Fig. 5 illustrates the structure chart according to an embodiment of key node link positioner in IGP topology of the present invention.

Fig. 6 illustrates the structure chart according to another embodiment of key node link positioner in IGP topology of the present invention.

Embodiment

Various exemplary embodiment of the present invention is described in detail now with reference to accompanying drawing.It should be noted that: unless specifically stated otherwise, otherwise positioned opposite, the numerical expression of the parts of setting forth in these embodiments and step and numerical value do not limit the scope of the invention.

Meanwhile, it should be understood that for convenience of description, the size of the various piece shown in accompanying drawing is not draw according to the proportionate relationship of reality.

Illustrative to the description only actually of at least one exemplary embodiment below, never as any restriction to the present invention and application or use.

May not discuss in detail for the known technology of person of ordinary skill in the relevant, method and apparatus, but in the appropriate case, described technology, method and apparatus should be regarded as a part of authorizing specification.

In all examples with discussing shown here, any occurrence should be construed as merely exemplary, instead of as restriction.Therefore, other example of exemplary embodiment can have different values.

It should be noted that: represent similar terms in similar label and letter accompanying drawing below, therefore, once be defined in an a certain Xiang Yi accompanying drawing, then do not need to be further discussed it in accompanying drawing subsequently.

First the symbol used herein is described:

I, j represent the router code name in network;

N represents the sum of router in network;

σ _ijrepresent from router i to the IGP of router j shortest path entry sum of equal value, σ _ij>=1;

L represents specific router or link, σ _ijl () represents from router i to router j and through the shortest path entry number of l;

B _lbe called the betweenness of l, to the specific l in network, calculate b _l=∑ _ijσ _ij(l)/σ _ij;

Calculate $B_l=\frac{b_l}{\max b_l}=\frac{{\mathrm{\Σ}}_{\mathrm{ij}}{\mathrm{\σ}}_{\mathrm{ij}}\left(l\right)/{\mathrm{\σ}}_{\mathrm{ij}}}{N\×(N-1)};$

Consider that number of network node may change, as router failure exit service, the network capacity extension increases router etc. newly, can use maxb _lthe betweenness of l is normalized and obtains normalization betweenness, maxb _l=N × (N-1), then $B_l=\frac{b_l}{\max b_l}=\frac{{\mathrm{\Σ}}_{\mathrm{ij}}{\mathrm{\σ}}_{\mathrm{ij}}\left(l\right)/{\mathrm{\σ}}_{\mathrm{ij}}}{N\×(N-1)}.$

Fig. 1 illustrates the flow chart according to an embodiment of the localization method of key node link in Large IP Network IGP topology of the present invention.

As shown in Figure 1, step 102, obtains whole network IGP topological sum routing table.

Network management system can obtain the IGP topology of the whole network at special time in three ways:

(1) SNMP fetch equipment MIB storehouse thus obtain whole network IGP topological sum routing table;

(2) from the configuration file of equipment, obtain the IGP metric of link thus obtain whole network IGP topological sum routing table;

(3) NM server and the network equipment set up IGP neighbours, receive LSP(Link StatusPacket, Link State bag) thus obtain whole network IGP topological sum routing table.

Step 104, calculates from router i to the ISIS of router j shortest path entry sum of equal value σ according to whole network routing table _ij.For any one router i in whole network and router j, calculate ISIS(Intermediate system to intermediate system, Intermediate System-to-Intermediate System) shortest path entry sum σ of equal value _ij.

For any one router in whole network or link l:

Step 106, obtains from router i to the router of process or the number of times σ of link l the ISIS of router j shortest path of equal value _ij(l).

Step 108, to the particular router in network or link l, calculates b _l=∑ _ijσ _ij(l) σ _ij, calculate the normalization betweenness B of router or link l _l:

$B_l=\frac{b_l}{\max b_l}=\frac{{\mathrm{\Σ}}_{\mathrm{ij}}{\mathrm{\σ}}_{\mathrm{ij}}\left(l\right)/{\mathrm{\σ}}_{\mathrm{ij}}}{N\×(N-1)}$

Wherein, N represents the sum of router in described whole network.

Can calculate from router i to the IGP of router j shortest path entry sum of equal value σ according to whole network routing table _ij, the number of times σ of these shortest paths just past node or link l can be obtained simultaneously _ijl (), combination of nodes ij all in traverses network, can obtain B _l.

Step 110, according to the normalization betweenness B of router or link l _ldetermine key node and link in IGP topology.From B _lmathematical definition can release, the value of this quantizating index is larger, shows to have in network more shortest paths through this node or link, means once this node or link failure, will affect calculating and the convergence of network IGP in the larger context.

By the betweenness of computing network interior joint and link, for realize Large IP Network topology link and node importance judge important foundation is provided, the localization method reliability of this key node and link is high, key node and link in IGP topology can be located fast and accurately, be convenient to the importance of decision node and link from the overall situation or individuality.After being realized by IP network guard system program, the betweenness value B of total network links/node can be calculated in real time _l, from big to small after sequence, very clear and definite node intuitively/link relation can be provided to judge for network manager.

In one embodiment, betweenness value and the unmatched node of topology location and link can also be determined in conjunction with the topology of network according to the betweenness of node and link, thus determine abnormal nodes and link, carry out IGP route abnormality detection, from network-wide basis assessment IGP topology health status, Timeliness coverage topology is abnormal.The network configuration of mainstream network operator is generally divided into core layer and marginal layer, and core layer is responsible for the trans-regional forwarding of flow, and marginal layer is responsible for the traffic aggregation of specific region.Under normal circumstances, the betweenness of network core node/link should be greater than the betweenness of network edge node/link.But, the interim route adjustment carried out due to network failure, the too much shortest path of individual rim node or link bearer may be caused, cause local nodes or link flow pressure excessive, when the very large fringe node of these betweenness values or link down, unnecessary IGP route fluctuation will be brought again.On the other hand, network core node in fact by very other route bypasses, may not bear core node due large discharge forwarding effect due to IGPmetric unreasonable allocation.By calculating the betweenness of the whole network node and link, and sort according to size, betweenness value and the unmatched abnormal nodes of topology location and link can be highlighted, thus IGP route arranges irrational position in accurate fixer network, help network manager to carry out the adjustment of route in time, eliminate potential faults.

By technical scheme of the present disclosure after IP network guard system realizes, there is following main efficacy results:

(1) importance of real-time quantization the whole network node/link, for O&M guarantee provides foundation.The fluctuation of IGP can affect some to the quality of the business of network delay sensitivity as video and voice.Result is sorted by the betweenness of computing network node and link, IP network management system can tell network O&M personnel in mode the most intuitively, those nodes and the link that have larger betweenness value are even more important to stablizing of network IGP, once these nodes or link occurs fault, large-scale IGP route will be caused to fluctuate, and then affect quality of service.Therefore, the emphasis that the node of larger betweenness value and link are network operations is ensured to have.

(2) for network planning construction provides IGP topology rational criterion.In the dilatation of network is built, how designing IGP metric to meet evenly rationally forwarding of network institute bearer traffic, is the problem that Web designer needs emphasis to consider.Quantization method provided by the invention provides a kind of angle of close examination IGP topology newly, makes designer better can weigh the placement of assurance node/link and the relation of weight size, finds and get rid of the routing Design un-reasonable phenomenon that may exist.

Technical scheme of the present disclosure can be successfully applied in large-scale backbone network IP comprehensive network management, helps backbone network maintenance management personnel to carry out the reasonableness check of network IGP route.Large-scale backbone network uses ISIS agreement as IGP Routing Protocol usually.

Special server and backbone routers is had to set up IGP neighborhood in network management system, receive backbone network IGP LSP(Link State bag), therefore can obtain the ISIS metric value of link between P, calculate and store complete IGP topological sum routing table in real time.Fig. 2 illustrates that IP network pipe IGP route snapshot selects the schematic diagram at interface.

The ISIS shortest path entry sum of equal value σ of router i to router j is calculated from this routing table _ij.Meanwhile, the particular router of these shortest path processes of system log (SYSLOG) or the number of times σ of link l _ij(l).Router combination ij all in webmaster traverses network, calculates the betweenness B of all-router and link in network _l.Afterwards, network management system is by router and link sorts from big to small according to their betweenness value respectively and the mode of icon has shown, and the betweenness value of which equipment very clear or link and their positions in a network and the role that should bear are not inconsistent by network manager.Fig. 3 illustrates that 20** February 18 15 certain large-scale operator IP comprehensive network managements are to the ChinaNet network IGP topology rank (from big to small) of interior joint (router) betweenness and numeric distribution curve.Can see, what betweenness was larger is all Backbone Core router, also has part international interconnect backbone router device rank forward, and this is relevant in the international export set of node with this operator at present, belongs to normal phenomenon.

Fig. 4 be 20** February 18 15 certain large-scale operator IP comprehensive network managements to the rank (from big to small) of the link betweenness in CN2 network IGP topology and numeric distribution curve.Can see that one, CN2 network Heilongjiang Province goes out betweenness rank the whole network the second of province's link (-C-3.CN2-RE0:<-> Harbin, Beijing-A-2.CN2), with the betweenness value (C-C is interconnected) of Backbone Core link at same horizontal line.This phenomenon is very abnormal.The IGP metric of province's link is gone out by analyzing this province further, and the network operation situation combined at that time, learn it is that on it, IP circuit flow of carrying is adjusted to (attendant heightens the ISIS metric by shadow IP circuit temporarily) on-A-2.CN2 link of-C-3.CN2-RE0:<-> Harbin, Beijing because this region had transmission line unstable at that time.This circuit betweenness value reminds network maintenance staff in the high rank of the whole network, once this Circuit Interrupt, the IGP route of all business in this region will fluctuate, very large impact is brought on the network quality in this region, need the transmission line failure of repairing other direction IP circuit place as early as possible, and recover the ISIS metric of-C-3.CN2-RE0:<-> Harbin, link Beijing-A-2.CN2 in time, control the scale of routing convergence, ensure the stable of this area's network quality.

Fig. 5 illustrates the structure chart according to an embodiment of key node link positioner in IGP topology of the present invention.As shown in Figure 5, this device comprises: the whole network route acquisition module 51, for obtaining whole network IGP topological sum routing table; Betweenness value determination module 52, for for any one router in whole network or link l: the total σ of Intermediate System-to-Intermediate System ISIS shortest path entry of equal value calculating router i to router j according to whole network routing table _ij; Obtain from router i to the router of process or the number of times σ of link l the ISIS of router j shortest path of equal value _ij(l); Calculate the normalization betweenness of router or link l:

$B_l=\frac{b_l}{\max b_l}=\frac{{\mathrm{\&Sigma;}}_{\mathrm{ij}}{\mathrm{\&sigma;}}_{\mathrm{ij}}\left(l\right)/{\mathrm{\&sigma;}}_{\mathrm{ij}}}{N\&times;(N-1)}$

Wherein, N represents the sum of router in whole network;

Key point determination module 53, for determining key node and link in IGP topology according to the normalization betweenness of router or link l.

In one embodiment, the whole network route acquisition module obtains described whole network IGP topological sum routing table by fetch equipment management information base MIB storehouse; Or, from the configuration file of equipment, obtain the IGP metric of link thus obtain whole network IGP topological sum routing table; Or, set up IGP neighbours with the network equipment, receiving link status bag thus obtain whole network IGP topological sum routing table.Such as, the whole network route acquisition module and backbone routers set up IGP neighborhood, receive backbone network IGP Link State bag, obtain the ISISmetric value of link between P, calculate and store complete IGP topological sum routing table in real time.

Fig. 6 illustrates the structure chart according to another embodiment of key node link positioner in IGP topology of the present invention.As shown in Figure 6, this key node link positioner comprises the whole network route acquisition module 51, betweenness value determination module 52, key point determination module 53 and abnormity point determination module 64.Wherein, key point determination module 54 by the router of whole network and link according to betweenness value B _lsort from big to small, using router large for betweenness value and link as key node and link in IGP topology; Abnormity point determination module 64 is determined betweenness value and the unmatched node of topology location and link thus is determined abnormal nodes and link.

The disclosure is intended to provide a kind of scientific evaluation network IGP topology reasonability for IP network management system and detect the method and apparatus of IGP routing relation exception, the method and device use the evaluation index that can quantize, all links and the importance of node in IGP topology from network-wide basis dynamic evaluation network, to help network management personnel to locate key node and link in IGP topology fast and accurately, and the IGP routing relation that may exist is abnormal.

So far, described in detail according to key node link circuit positioning method and device in IGP topology of the present invention.In order to avoid covering design of the present invention, details more known in the field are not described.Those skilled in the art, according to description above, can understand how to implement technical scheme disclosed herein completely.

Method and system of the present invention may be realized in many ways.Such as, any combination by software, hardware, firmware or software, hardware, firmware realizes method and system of the present invention.Said sequence for the step of described method is only to be described, and the step of method of the present invention is not limited to above specifically described order, unless specifically stated otherwise.In addition, in certain embodiments, can be also record program in the recording medium by the invention process, these programs comprise the machine readable instructions for realizing according to method of the present invention.Thus, the present invention also covers the recording medium stored for performing the program according to method of the present invention.

Although be described in detail specific embodiments more of the present invention by example, it should be appreciated by those skilled in the art, above example is only to be described, instead of in order to limit the scope of the invention.It should be appreciated by those skilled in the art, can without departing from the scope and spirit of the present invention, above embodiment be modified.Scope of the present invention is limited by claims.

Claims (10)

1. a key node link circuit positioning method in Large IP Network Interior Gateway Protocol IGP topology, is characterized in that, comprising:

Obtain whole network IGP topological sum routing table;

The Intermediate System-to-Intermediate System ISIS shortest path entry sum of equal value σ of router i to router j in whole network is calculated according to whole network routing table _ij;

For any one router in described whole network or link l:

Obtain from router i to the router of process or the number of times σ of link l the ISIS of router j shortest path of equal value _ij(l);

Calculate the normalization betweenness of described router or link l:

$B_l=\frac{b_l}{\max b_l}=\frac{{\mathrm{\&Sigma;}}_{\mathrm{ij}}{\mathrm{\&sigma;}}_{\mathrm{ij}}\left(l\right)/{\mathrm{\&sigma;}}_{\mathrm{ij}}}{N\&times;(N-1)}$

Wherein, N represents the sum of router in described whole network;

Normalization betweenness according to described router or link l determines key node and link in IGP topology.

2. method according to claim 1, is characterized in that, described acquisition whole network IGP topological sum routing table comprises:

Described whole network IGP topological sum routing table is obtained by Simple Network Management Protocol SNMP fetch equipment management information base MIB storehouse;

Or,

From the configuration file of equipment, obtain the IGP metric of link thus obtain described whole network IGP topological sum routing table;

Or,

NM server and the network equipment set up IGP neighbours, receiving link status bag thus obtain described whole network IGP topological sum routing table.

3. method according to claim 2, is characterized in that, described NM server and the network equipment set up IGP neighbours, receiving link status bag LSP thus obtain described whole network IGP topological sum routing table and comprise:

NM server and backbone routers set up IGP neighborhood, receive backbone network IGP Link State bag, obtain the ISIS metric value of link between P, calculate and store complete IGP topological sum routing table in real time.

4. method according to claim 1, is characterized in that, the described betweenness according to described router or link l determines that in IGP topology, key node and link comprise:

By the router of described whole network and link according to betweenness value B _lsort from big to small, using router large for betweenness value and link as key node and link in IGP topology.

5. method according to claim 1, is characterized in that, also comprises:

Determine betweenness value and the unmatched node of topology location and link, thus determine abnormal nodes and link.

6. a key node link positioner in Large IP Network Interior Gateway Protocol IGP topology, is characterized in that, comprising:

The whole network route acquisition module, for obtaining whole network IGP topological sum routing table;

Betweenness value determination module, for for any one router in described whole network or link l:

The Intermediate System-to-Intermediate System ISIS shortest path entry sum of equal value σ of router i to router j is calculated according to described whole network routing table _ij;

Obtain from router i to the router of process or the number of times σ of link l the ISIS of router j shortest path of equal value _ij(l);

Calculate the normalization betweenness of described router or link l:

$B_l=\frac{b_l}{\max b_l}=\frac{{\mathrm{\&Sigma;}}_{\mathrm{ij}}{\mathrm{\&sigma;}}_{\mathrm{ij}}\left(l\right)/{\mathrm{\&sigma;}}_{\mathrm{ij}}}{N\&times;(N-1)}$

Wherein, N represents the sum of router in described whole network;

Key point determination module, for determining key node and link in IGP topology according to the normalization betweenness of described router or link l.

7. device according to claim 6, is characterized in that, described the whole network route acquisition module obtains described whole network IGP topological sum routing table by fetch equipment management information base MIB storehouse;

Or,

From the configuration file of equipment, obtain the IGP metric of link thus obtain described whole network IGP topological sum routing table;

Or,

IGP neighbours are set up, receiving link status bag thus obtain described whole network IGP topological sum routing table with the network equipment.

8. device according to claim 7, it is characterized in that, described the whole network route acquisition module and backbone routers set up IGP neighborhood, receive backbone network IGP Link State bag, obtain the ISIS metric value of link between P, calculate and store complete IGP topological sum routing table in real time.

9. device according to claim 6, is characterized in that, described key point determination module by the router of described whole network and link according to betweenness value B _lsort from big to small, using router large for betweenness value and link as key node and link in IGP topology.

10. device according to claim 6, is characterized in that, also comprises:

Abnormity point determination module, for determining betweenness value and the unmatched node of topology location and link thus determining abnormal nodes and link.