CN101582847B - Routing oscillation test method and autonomous system (AS) - Google Patents
Routing oscillation test method and autonomous system (AS) Download PDFInfo
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- CN101582847B CN101582847B CN2009100869798A CN200910086979A CN101582847B CN 101582847 B CN101582847 B CN 101582847B CN 2009100869798 A CN2009100869798 A CN 2009100869798A CN 200910086979 A CN200910086979 A CN 200910086979A CN 101582847 B CN101582847 B CN 101582847B
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Abstract
The invention discloses a routing oscillation test method and an autonomous system (AS). The method comprises the following steps: receiving route change markers and route update advertisements, whichare sent by adjacent ASs; judging whether the proactive route change event happens to self; if so, comparing to check whether the currently received identification of a source AS of the route change marker is the same as the self identification; obtaining that the currently received route update information of the route change marker is the same as that in self proactive route change event; determining that routing oscillation happens; wherein, the proactive route change event indicates that route change happens to self due to the received route update advertisements. The routing oscillation test method provided by the invention does not require each AS to disclose self routing strategies or route historical information, and has simple method and high operability.
Description
Technical field
The present invention relates to heterogeneous network route transmission field, relate in particular to a kind of routing oscillation test method and autonomous system (Autonomous System is called for short AS).
Background technology
Along with the rapid expansion of Internet scale, whole Internet is divided into different AS, and owing to reasons such as commerce or technology, there is the isomery characteristic in AS at aspects such as topological structure, network performance or network strategies.Each AS is inner by the Interior Gateway Protocol exchanging routing information, for example, each AS is inner by route selection information agreement (Routing Information Protocol, abbreviation RIP), open type shortest path priority protocol exchanging routing informations such as (Open Shortest Path First are called for short OSPF).By the Exterior Gateway Protocol exchanging routing information, Border Gateway Protocol (Border GatewayProtocol is called for short BGP) has become the actual Exterior Gateway Protocol of present Internet between each AS.
BGP runs on the path vector Routing Protocol that is used for mutual exchanging routing information between the AS on the Internet.This agreement allows AS to define the routing policy of oneself independently, though guaranteed the reasonability of AS part like this, can't guarantee the reasonability of the overall situation, may cause routing policy conflict between AS, thereby cause BGP not restrain, produce route flapping (routing oscillation).Route flapping is meant between a plurality of AS and constantly exchanges identical routing iinformation repeatedly, and can not set up a stable route.
Route flapping causes packet circulating transfer and can not in time arrive the destination between the several routers of network, also can cause data-bag lost and out of order and network convergence to postpone, thereby the emphasis network burden influences network performance and service quality.
At BGP route flapping problem, prior art provides following technical scheme:
Whether one class is a static solution, promptly under the situation that route flapping does not take place, the route strategy is analyzed in advance, detect the routing policy conflict and exist, thereby can avoid route flapping, for example route arbitration plan.These class solution existing problems are: be owing to commercial relations or for safe and secret consideration on the one hand, AS is not easy to disclose its inner routing policy information and inner topology structural information, perhaps the routing policy information that provides of AS can not upgrade in time, that is to say that the completeness of routing policy information and promptness lack; Be on the other hand, studies show that, promptly allow to grasp whole routing policy information, analyze the routing policy conflict and also be a np complete problem or a NP difficult problem (np complete problem or a NP difficult problem are meant in the theoretical information in the theory of computational complexity field open question) so far, obviously, but the operational degree of this class technical scheme is low.
Another kind of is dynamic solution, promptly in agreement, design extra route flapping testing mechanism and judgment criteria, when finding route flapping, go again to eliminate, for example, route flapping suppresses the simple path vector agreement (Simple Path Vector Protocol is called for short SPVP) of people's propositions such as (RFD) algorithm or Griffin etc.The problem that this class technical scheme exists is: this class scheme has increased each AS path historical information in the routing update announcement, by being attached to the path change historical information in the routing update announcement, finds the AS of routing policy conflict, and suppresses relevant route.The problem that this class solution exists is to need each AS to disclose self path historical information, and that the path historical information also is that each AS is not easy to is disclosed.
In sum, need each AS to cooperate with each other in the existing solution, relevant routing policy or path historical information are provided, and only can not detect route flapping alone according to single AS routing iinformation, yet owing to commercial relations or for safe and secret consideration, the relevant routing policy of each AS or path historical information are to be not easy to disclosedly, so the prior art solutions operability is low, is unfavorable for accurately detecting route flapping.
Summary of the invention
The objective of the invention is at problems of the prior art, a kind of routing oscillation test method and autonomous system are provided, do not need open routing policy information of each autonomous system or path historical information, method is simple, the operability height can accurately detect route flapping.
For achieving the above object, the invention provides a kind of routing oscillation test method, comprising:
Receive route variation mark and routing update announcement that adjacent autonomous system sends, described route changes sign, routing update information and the routing policy change information that mark comprises the source autonomous system that the generation route changes;
Judge whether passive route change events self has taken place, described passive route change events is meant because described routing update announcement causes self the incident that route changes taking place;
When passive route change events takes place self when,
(1) whether the sign of the source autonomous system of the more current route variation mark that receives is identical with the sign of self; And
(2) whether the more current route that the receives routing update information that changes mark is identical with routing update information in self the passive route change events;
If it is identical that the comparative result of described (1) and (2) is, then determine to have taken place route flapping; If have one in the comparative result of described (1) and (2), then determine not take place route flapping for inequality;
After passive route change events takes place,, then received described route variation mark is announced in company with the routing update of self and sent to adjacent autonomous system together if determine not take place route flapping.
The present invention also provides a kind of autonomous system, comprising:
Receiver module is used to receive route variation mark and the routing update announcement that adjacent autonomous system sends, and described route changes sign, routing update information and the routing policy change information that mark comprises the source autonomous system that the generation route changes;
Judge module is used to judge whether passive route change events self has taken place, and described passive route change events is meant because the described routing update announcement that described receiver module receives causes self the incident that route changes taking place;
Comparison module, be used for judging when passive route change events has taken place self when described judge module, whether the sign of source autonomous system that the route that more described receiver module is current to receive changes mark is identical with the sign of self, and whether the routing update information of the more current route variation mark that receives is identical with routing update information in self the passive route change events;
Determination module, be used for determining whether to have taken place route flapping according to the comparative result of described comparison module, if the sign of the source autonomous system of the current route variation mark that receives of described receiver module is identical with the sign of self, and when the routing update information that the current route that receives changes mark is identical with routing update information in self the passive route change events, then determine to have taken place route flapping, otherwise, determine not take place route flapping;
First sending module, be used for when described judge module judge passive route change events has taken place self after and when described determination module was determined route flapping not to take place, the route that described receiver module is received changed mark and announces in company with the routing update of self and send to adjacent autonomous system together.
Routing oscillation test method provided by the invention and AS, for the single AS in the network, if cause self producing passive route change events after receiving routing update announcement from neighboring AS, the sign of the source AS of the then more current route variation mark that receives and the sign of self, whether the routing update information that changes mark with the current route that receives is all identical with the routing update information of the passive route exchanging incident that self produces, if the two is all identical, then can judge route flapping has taken place, otherwise, can judge route flapping not take place.Routing oscillation test method provided by the invention does not need each AS to disclose self routing policy or path historical information, and method is simple, and the operability height can accurately detect route flapping.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Figure 1 shows that routing oscillation test method flow chart of the present invention;
Figure 2 shows that a kind of network architecture schematic diagram that the present invention relates to;
Figure 3 shows that AS embodiment one structural representation of the present invention;
Figure 4 shows that AS embodiment two structural representations of the present invention.
Embodiment
Be illustrated in figure 1 as routing oscillation test method flow chart of the present invention, comprise:
The route that step 101, AS receive the neighboring AS transmission changes mark and routing update announcement, and this route changes mark and comprises source AS, routing update information and the routing policy change information that the route variation takes place.Routing update announcement is used to notify the routing update information that neighboring AS should this locality AS, and route changes that mark then reflects is that the routing update information of the source AS that route changes and routing policy change information etc. take place.Route variation mark can be carried in the routing update announcement and send to neighboring AS with the routing update announcement.
Whether the sign of AS that the more current route that receives of step 103, AS changes mark is identical with the sign of self, and whether the routing update information in the more current route variation mark that receives is identical with routing update information in self the passive route change events; If it is identical that these two kinds of comparative results are, then execution in step 105; If have one in these two kinds of comparative results for inequality, then execution in step 106.
Step 106, determine not take place route flapping, the route that receives is changed mark send to neighboring AS together in company with self local routing update announcement.
In the routing oscillation test method provided by the invention, for the single AS in the network, if cause self producing passive route change events after receiving routing update announcement from neighboring AS, the sign of the source AS of the then more current route variation mark that receives and the sign of self, whether the routing update information that changes mark with the current route that receives is all identical with the routing update information of the passive route exchanging incident that self produces, if the two is all identical, then can judge route flapping has taken place, otherwise, can judge route flapping not take place.Routing oscillation test method provided by the invention does not need each AS to disclose self routing policy or path historical information, and method is simple, the operability height.
Introduce the implementation of route detecting method of the present invention below by concrete example.
Be illustrated in figure 2 as a kind of network architecture schematic diagram that the present invention relates to, in this network system, comprise three adjacent AS, be respectively AS1, AS2 and AS3, these three AS are respectively three isomery AS, these three AS arrive identical destination 0, each AS next door is 0 the feasible path tabulation to the destination separately, the priority of each route is according to arranging from high to low, for example, AS1 0 has two feasible paths (10) (120) to the destination, and the priority of path (10) is greater than path (120).In the system shown in Figure 2, under initial situation, exist between each AS and stablize routing tree (10) (20) (310), route flapping can not take place.
Sometime, for a certain reason or demand need, if certain AS, AS1 for example, routing policy need be modified, the priority in the path of AS1 (120) becomes greater than path (10), and then AS1 generates route and changes mark P, and route is changed mark P sends to adjacent AS2 and AS3 together with self routing update announcement.
Route changes mark P and is generated by the AS that routing policy changes, and the content of route variation mark P comprises sign, routing policy change information RC and the routing update information RI of the source AS that the route change events takes place.Wherein, change among the mark P in route, the expression of source AS can be the network ID of this AS, and routing policy change records RC describes the detailed content that this routing policy changes, the optimal path before optimal path after routing update information RI record route change events takes place and route change events take place.
For system as shown in Figure 2, when the routing policy of AS1 changed, the route of generation changed mark P and can be described as:
P
(S，RC，RI)＝[1，(10↓120↑)，(120/10)]。
Wherein, 1 is the network ID of AS, routing policy changing content RC is that the priority in path (10) descends, the priority in path (120) rises, the content of routing update information RI is that the optimal path after path change incident P takes place is (120), and the optimal path before route change events P takes place is (10).AS1 sends in the routing update announcement of neighboring AS and also comprises the route change information that AS1 takes place.
After AS2 receives the route variation mark P and routing update announcement that AS1 sends over, carry out routing decision, judge whether the routing update announcement can cause self taking place passive route change events, among the present invention, passive route change events is meant owing to the passive route change events that causes self to produce is announced in the routing update that receives neighboring AS, is different from owing to self routing policy is changed and the route change events of active generation.Particularly, AS2 can judge that the priority in path (10) in the routing update announcement descends and the priority rising of path (120) does not impact the optimal path of self, be self not need to produce passive route change events, do not send to neighboring AS 1 and AS3 so AS does not need that route is changed mark P, do not need to carry out route flapping yet and detect.
AS3 carries out routing decision after receiving the route variation mark P and routing update announcement that AS1 sends over, and judges whether the routing update announcement can cause self taking place passive route change events.Particularly, AS3 can judge that the priority in path (10) in the routing update announcement descends and the priority rising meeting of path (120) impacts self optimal path, the path of AS3 (310) can be invalid owing to the cancelling of path (10) of AS1, so AS3 need be chosen as optimal path with path (30), promptly AS3 self need produce passive route change events.
After AS3 determines self to produce passive route change events, judge whether the source AS that route changes among the mark P is self, and judge that the routing update information among the route variation mark P is whether identical with routing update information in self the passive route change events.Particularly, can judge whether route changes the network ID of the source AS among the mark P identical with self.Because it is 1 that route changes the network ID of the source AS of mark P, and the network ID of AS3 is 3, and the routing update information that route changes among the mark P is different with routing update information in self the passive route change events, so AS3 does not carry out the route flapping detection.Because passive route change events has taken place AS3, the optimal path of AS3 sends to AS1 and AS2 so AS3 need send the routing update announcement, and encloses route variation mark P simultaneously because the optimal path of AS1 changes has changed.The routing update announcement that AS3 sends shows that the priority in the path (30) of AS3 rises, and the priority of path (310) descends.
AS1 judges that passive route change events can not take place for self, so AS1 does not need routing update mark P is sent to AS2 and AS3 after the route that receives the AS3 forwarding changes mark P and routing update announcement.AS2 is after receiving the route variation mark P and routing update announcement that AS3 sends, judge passive route change events need take place self, because cancel in the path (310) of AS3, so the path of AS2 (230) are invalid, AS2 need rise to optimal path with path (20).AS2 finds that through back relatively route changes the network ID of the source AS among the mark P and self is inequality, and the routing update information that route changes among the mark P is different with routing update information in self the passive route change events, then AS2 changes mark P and routing update announcement with route and sends to AS1 and AS3 together, the routing update announcement that AS2 sends shows that the priority in the path (230) among the AS2 descends, and the priority of path (20) rises.
Receive the route variation mark P and routing update announcement of AS2 transmission as AS1 after, owing to the path (230) of AS2 to cancel the path (10) that causes AS1 invalid, so AS1 need rise the priority of path (120), the priority of path (10) is descended, and promptly AS1 has produced passive route change events.AS1 compares network ID and the self networks ID that route changes the source AS among the mark P, and routing update information among the comparison route variation mark P and the routing update information in the passive route change events of self, the two comparative result is equal, then AS1 determines to have taken place route flapping, and AS1 points out to produce the former of this route flapping because RC (10 ↓ 120 ↑) simultaneously.
In the foregoing embodiments, when the routing policy variation has taken place in an AS, needing to send route variation mark P and routing update announces to neighboring AS, adjacent AS is after receiving that route changes mark P and routing update announcement, if passive route change events has taken place, then need to send and be used to show that the routing update of this passive route change events announces to adjacent AS, and the route that receives is changed mark P together send to adjacent AS.That is to say that each AS is after receiving that route changes mark P and routing update announcement, if do not cause and self produce passive route change events P, the route change events that does not then need to receive sends to neighboring AS.
If caused the generation of self passive route change events, then AS need further judge whether to have produced route flapping, if do not produce route flapping, then AS need change route mark P and transmits, and send be used to show self passive route change events advertising of route to neighboring AS.
Do not send the content that route changes mark owing to do not relate in the existing bgp protocol,, can realize by the expansion bgp protocol so change mark in order to send the route that relates in the various embodiments of the present invention.Particularly, can change mark by expansion bgp protocol structure route, the form of route variation mark can be as described above shown in each embodiment, the attribute of bgp protocol comprises essential/optional, excessive/non-excessive attribute, increase self-defining optional excessive attribute OTP and change mark in order to load route, the data line code can be selected 30 of self defined area for use, and attribute length can be 2 bytes, can load the route that reaches 65536 bytes and change mark.
Be illustrated in figure 3 as AS embodiment one structural representation of the present invention, this AS comprises: receiver module 11, judge module 12, comparison module 13 and determination module 14, judge module 12 is connected with comparison module 13 with receiver module 11 respectively, and determination module 14 is connected with comparison module 13.The operation principle of this method is: receiver module 11 receives route variation mark and the routing update announcement that adjacent AS sends, judge module 12 judges whether passive route change events self takes place, if described judge module 12 is judged passive route change events has taken place self, then whether the comparison module 13 more current routes that receive change the source AS of mark and self are same AS, and whether the routing update information in the more current route variation mark that receives is identical with the routing update information in the passive route change events that self takes place, if the two result relatively is identical, then determination module 14 determines to have taken place route flapping, otherwise determination module 14 determines not take place route flapping.
Be illustrated in figure 4 as AS embodiment two structural representations of the present invention, this AS also comprises on embodiment illustrated in fig. 3 one basis: first sending module 15, respectively with judge module 12, receiver module 11 is connected with determination module 14, be used for when determination module 14 is determined route flapping not to take place, the route variation mark P that receiver module 11 is received is transmitted to neighboring AS, and the routing update that sends the passive route change events be used to show that self produces is announced to neighboring AS, judge when judge module 12 and the route that receives not changed mark P and not send to neighboring AS when passive route change events does not take place self.
AS shown in Figure 4 can also comprise second sending module, and the route change events that is used for taking place owing to self strategy change sends to adjacent AS.
Among the AS provided by the invention, for the single AS in the network, cause self producing passive route change events if receive after changing mark from the routing update announcement of neighboring AS and route, whether the then more current route that receives changes the source AS in the mark and self is same AS, and whether the routing update information in the passive route exchanging incident of the more current route that the receives routing update information that changes mark and self generation is identical, if the two is all identical, then can judge route flapping has taken place, otherwise, can judge route flapping not take place.AS provided by the invention does not need each AS to disclose self routing policy or path historical information, and simple in structure, the operability height can accurately detect route flapping.
It should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not limit it, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement technical scheme of the present invention, and these modifications or be equal to replacement and also can not make amended technical scheme break away from the spirit and scope of technical solution of the present invention.
Claims (3)
1. a routing oscillation test method is characterized in that, comprising:
Receive route variation mark and routing update announcement that adjacent autonomous system sends, described route changes sign, routing update information and the routing policy change information that mark comprises the source autonomous system that the generation route changes;
Judge whether passive route change events self has taken place, described passive route change events is meant because described routing update announcement causes self the incident that route changes taking place;
When passive route change events takes place self when,
(1) whether the sign of the source autonomous system of the more current route variation mark that receives is identical with the sign of self; And
(2) whether the more current route that the receives routing update information that changes mark is identical with routing update information in self the passive route change events;
If it is identical that the comparative result of described (1) and (2) is, then determine to have taken place route flapping; If have one in the comparative result of described (1) and (2), then determine not take place route flapping for inequality;
After passive route change events takes place,, then received described route variation mark is announced in company with the routing update of self and sent to adjacent autonomous system together if determine not take place route flapping.
2. method according to claim 1 is characterized in that, described route changes mark and is carried in the described routing update announcement.
3. an autonomous system is characterized in that, comprising:
Receiver module is used to receive route variation mark and the routing update announcement that adjacent autonomous system sends, and described route changes sign, routing update information and the routing policy change information that mark comprises the source autonomous system that the generation route changes;
Judge module is used to judge whether passive route change events self has taken place, and described passive route change events is meant because the described routing update announcement that described receiver module receives causes self the incident that route changes taking place;
Comparison module, be used for judging when passive route change events has taken place self when described judge module, whether the sign of source autonomous system that the route that more described receiver module is current to receive changes mark is identical with the sign of self, and whether the routing update information of the more current route variation mark that receives is identical with routing update information in self the passive route change events;
Determination module, be used for determining whether to have taken place route flapping according to the comparative result of described comparison module, if the sign of the source autonomous system of the current route variation mark that receives of described receiver module is identical with the sign of self, and when the routing update information that the current route that receives changes mark is identical with routing update information in self the passive route change events, then determine to have taken place route flapping, otherwise, determine not take place route flapping;
First sending module, be used for when described judge module judge passive route change events has taken place self after and when described determination module was determined route flapping not to take place, the route that described receiver module is received changed mark and announces in company with the routing update of self and send to adjacent autonomous system together.
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