CN102404190B - Method and device for determining Att signs under multi-topology - Google Patents
Method and device for determining Att signs under multi-topology Download PDFInfo
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- CN102404190B CN102404190B CN201010284935.9A CN201010284935A CN102404190B CN 102404190 B CN102404190 B CN 102404190B CN 201010284935 A CN201010284935 A CN 201010284935A CN 102404190 B CN102404190 B CN 102404190B
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Abstract
The invention provides a method and a device for determining Att signs under multi-topology. The method comprises that A, a first border router receives corresponding relationship between zone configuration released by other border routers and topological signs and receives corresponding relationship between zone configuration released by a down linking level-1 router and the topological signs; and B aiming at each pair of corresponding relationship released by the other border routers, the first border router judges whether the corresponding relationship exist in the corresponding relationships released by the level-1 router. If not, then a first Att sign is generated according to the zone configuration in the corresponding relationship, accordingly the down linking level-1 router generates a default route directing the first border router according to the first Att sign. By means of the method and the device for determining Att signs under multi-topology, topologies of regional addresses can be distinguished, thereby generating correct Att signs.
Description
Technical field
The present invention relates to route technology, particularly definite method and apparatus of the lower Att mark of many topologys.
Background technology
At present, in intermediate system-intermediate system (ISIS), router is mainly divided three classes, and is respectively the border router (also referred to as level-1,2 routers) in two layers of (level-2) router and the region on one deck (level-1) router in region, backbone network.Wherein, level-1 router can not be connected with the router in other regions, and level-2 router connects different regions, and border router is connected with the level-2 router on backbone network.
In the situation that ISIS supports many topologies (MTR) characteristic, the area configurations that level-1 router and border router are issued is not distinguish topology, and this just may cause following two problems:
1, some region generates unnecessary default route:
In the networking shown in Fig. 1, have three regions, be respectively region 1 to region 3, wherein, the topology in region 1 and region 2 is IPV4, and the topology in region 3 is IPV6, and in region, the area configurations of each router as shown in Figure 1.If the router R (being essentially level-2 router) on backbone network does not support IPV6 topology, in Fig. 1, support the region 3 of IPV6 topology to be equivalent to an isolated island, therefore, need in region 3, not generate the default route information of going out.But, for region 3, its border router F is two layers of label translation-protocol information (level-2LSP to border router B and border router C transmission in study, wherein comprise respectively area configurations 04.44 and area configurations 04.54) time, relatively this study to area configurations whether exist in the area configurations that the level-1 router of lower extension issues, if so, generate and be set to 0 Att mark, if not, generate the Att mark of set according to this area configurations; Afterwards, the Att mark of generation is sent to the level-1 router of lower extension.In Fig. 1, the level-1 router of hanging under border router F is router E, and the area configurations of its issue does not comprise the area configurations 04.44 and 04.54 that above-mentioned study is arrived, therefore, border router will generate respectively the Att mark of set according to these two area configurations, and sends to router E.When router E receives after the Att mark of this set, will generate the default route that points to border router F according to this Att mark.
Because the router R on backbone network does not support IPV6 topology, and the topology in other two regions is IPV4, therefore, supports the region 3 of IPV6 topology to there is no need to generate the default route that points to border router F in Fig. 1 at all.Therefore, the default route that can obtain above-mentioned generation is unnecessary default route, and this necessary default route can cause data leak in region 3 to backbone network.
2, some region does not generate necessary default route:
In the networking shown in Fig. 2, have three regions, be respectively region 1 to region 3, wherein, the topology in region 1 and region 3 is IPV6 topology, and the topology in region 2 is IPV4.As shown in Figure 2, wherein, the router D in Fig. 2 has two area configurations to area configurations on each router, is respectively 04.54 and 06.33.In Fig. 2, the router R on backbone network supports dual stack IPV4 and IPV6, in order to be networked in region 1 and region 3, need in region 3, generate the default route information of going out.But, in the time that border router C learns the area configurations 06.33 of border router B issue, because the level-1 router of hanging under this border router has two, be respectively router D and E, and, in the area configurations that this router D issues, comprise the area configurations 06.33 that border router is issued, therefore, border router C can generate the Att mark that is set to 0 according to this area configurations 06.33, sends to afterwards router D and E.In the time that router E receives this Att mark, just can not generate the default route that points to IPv6 Area Border Router C.
Because the region 1 and 3 in Fig. 2 is all IPV6 topology, and the router R on backbone network supports dual stack IPV4 and IPV6, therefore, network in order to make region 1 and region 3, need in region 3, generate the default route information of going out, and above-mentioned because the router in different topology has been issued identical area configurations and caused border router can not generate correct Att mark, make router E can not generate the default route that points to IPv6 Area Border Router C, cause the far-end IP v6 topology in IPv6 region can not form networking state, cause unnecessary service disconnection.
From describing and find out above, why produce this two problems, be mainly that the area configurations that level-1 router and border router are issued is not distinguished topology and causes, in order addressing this problem, a kind ofly can distinguish topological regional address and issue and currently urgently need.
Summary of the invention
The invention provides definite method and apparatus of the lower Att mark of many topologys, so that the topology of distinguishable region address, thereby correct Att mark generated.
Technical scheme provided by the invention comprises:
A definite method for the lower Att mark of many topologys, comprising:
A, the first border router receives the corresponding relation between area configurations and the topology mark that other border routers issue, and receives the corresponding relation between area configurations and the topology mark that the lower level-1 router of hanging issues;
B, each corresponding relation that described the first border router is issued for other border routers, judge level-1 router issue corresponding relation in whether there is this corresponding relation, if not, generate an Att mark according to the area configurations in corresponding relation, generate according to a described Att mark default route that points to the first border router for the level-1 router of lower extension.
A determining device for the lower Att mark of many topologys, comprising:
Receiving element, for receiving the corresponding relation between area configurations and the topology mark that other border routers issue, and receives the corresponding relation between area configurations and the topology mark that the lower level-1 router of hanging issues;
Judging unit, for each corresponding relation of issuing for other border routers, judge in the corresponding relation of level-1 router issue whether have this corresponding relation;
Processing unit, when being no in described judging unit judged result, generates an Att mark according to the area configurations in corresponding relation, generates the default route that points to the first border router for the level-1 router of lower extension according to a described Att mark.
As can be seen from the above technical solutions, in the present invention, receive the corresponding relation between area configurations and the topology mark that other border routers issue by the first border router, and receive the corresponding relation between area configurations and the topology mark that the lower level-1 router of hanging issues; Each corresponding relation of issuing for other border routers, judge level-1 router issue corresponding relation in whether there is this corresponding relation, if not, generate an Att mark according to the area configurations in corresponding relation, generate according to a described Att mark default route that points to the first border router for the level-1 router of lower extension.That is to say, the present invention is in the time generating Att mark, and not merely comparison domain configuration, has also considered topological mark, and this can solve prior art and can not generate but area configurations is identical due to different topology the problem of necessary default route.
Brief description of the drawings
Fig. 1 is existing the first topologic network schematic diagram;
Fig. 2 is existing the second topologic network schematic diagram;
The flow chart that Fig. 3 provides for the embodiment of the present invention;
The schematic diagram of the TLV field that Fig. 4 provides for the embodiment of the present invention;
The structure drawing of device that Fig. 5 provides for the embodiment of the present invention.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
The method that the embodiment of the present invention provides mainly comprises the flow process shown in Fig. 3:
In step 301, the corresponding relation that other border routers are issued, and the corresponding relation that level-1 router is issued is to be all carried in the V field of TLV field to issue, and the T field in this TLV field is different with the T field of the existing TLV field configuring for publishing region.Conventionally, the T field value of the existing TLV field for publishing region configuration is 0 or 1, and therefore, desirable other values of T field in the TLV field that the embodiment of the present invention adopts, such as 255 etc.
As for the corresponding relation how utilizing between the configuration of TLV field publishing region and topology mark, specifically can be shown in Figure 4.In the TLV field shown in Fig. 4, V field is for bearing area configuration and topology mark.Wherein, the length of this area configurations accessible region domain addresses and regional address represents, the available MTID of topology mark represents.
In the TLV field shown in Fig. 4, L field is for representing the message length of V field carrying.Its size is generally no more than 255 bytes.
Particularly, step 303 is: generating after the 2nd Att mark, the 2nd Att mark is being sent to the level-1 router of lower extension, when level-1 router receives after the 2nd Att mark, do not generating the default route that points to the first border router.Here, the 2nd Att mark can be: be set to 0 Att mark.
Here, an Att is labeled as non-zero Att mark.
So far, complete the flow process shown in Fig. 3.
For making the embodiment of the present invention clearer, be described as an example of the networking shown in Fig. 1 and Fig. 2 example below.
In Fig. 1, the corresponding relation of border router F between the area configurations 04.44 and 1 (for representing IPV4 structure) of topology mark that receive router B issue, and/or when corresponding relation between router C area configurations 04.54 and the topology mark 2 (for representing IPV4 another kind structure) issued, for each corresponding relation receiving, judge self lower level-1 router of hanging is whether to have this corresponding relation in the corresponding relation issued of router E.The corresponding relation of issuing due to router E is the corresponding relation between area configurations 06.33 and 3 (for representing IPV6 structure) of topology mark, and therefore, this judged result is no.In this judged result while being no, border router F will be according to the area configurations in this corresponding relation such as 04.54 generation the one Att mark, by the topology mark in this corresponding relation such as topology mark 2 and the first mark of generating send to router E.When router E receives after topology mark 2 and an Att mark, because router E supports IPV6, and this topology mark 2 represents the structure of IPV4, router E does not support this topology mark 2 obviously, therefore, can not generate the default route that points to border router F according to an Att mark, but directly abandon topology mark 2 and an Att mark of this reception.And in fact, because the router R on backbone network in Fig. 1 does not support IPV6 topology, and, the topology in region 1 and 2 is supported IPV4, therefore, in Fig. 1, support the region 3 of IPV6 topology to be equivalent to an isolated island, the router E in this region 3 is that to there is no need to generate the default route that points to border router F be correct.The method providing by the embodiment of the present invention, can ensure can not generate unnecessary default route.
For Fig. 2, the corresponding relation of border router C between the area configurations 06.33 and the topology mark I (for identifying a kind of structure of IPV6 topology) that receive border router B issue, will be for this corresponding relation, judge in the corresponding relation that router D and router E issue whether have this corresponding relation.The corresponding relation of issuing due to router D is that area configurations 04.54 and topology identify 3 (for representing other structures of IPV4 topology, this topology mark also can be above-mentioned topology mark 1 or 2) between corresponding relation, and area configurations 06.33 and the topological corresponding relation identifying between 3, the corresponding relation that router E issues is that area configurations 06.77 and topology identify II (for representing the another kind of structure of IPV6, also can be above-mentioned topology mark I) between corresponding relation, it does not comprise the corresponding relation between above-mentioned area configurations 06.33 and topology mark I, therefore, above-mentioned judged result is no.Afterwards, border router C will generate an Att mark according to the area configurations 06.33 in this corresponding relation, and the topology mark I in this corresponding relation and the first mark of generation are sent to router E and D, after router E receives, because router E supports IPV6, and this topology mark I also represents a kind of structure of this IPV6, therefore, exist this router E to support the possibility of topology mark I, in the time supporting, generate the default route that points to the first border router according to an Att mark; Otherwise, abandoning topology mark I and an Att mark of this reception, this can solve prior art and can not generate but area configurations is identical due to different topology the problem of necessary default route.And identify after I and an Att mark when router D receives topology, because router D supports IPV4, and this topology mark I represents the structure of IPV6, router D does not support this topology mark I obviously, therefore, can not generate the default route that points to border router C according to an Att mark, but directly abandon topology mark I and an Att mark of this reception, this can ensure that region 2 can not generate unnecessary default route.
So far, specific embodiment provided by the invention is completed to description.
In above-mentioned flow process, step 301 is in the time that the first border router is receiving the corresponding relation between area configurations and the topology mark that the level-1 router of other border routers or lower extension issues, also can further comprise following operation: judge the topology mark of self whether supporting in this corresponding relation, if so, just carry out following step 302 for this corresponding relation; Otherwise, abandon this corresponding relation.
Consider the flexibility of the embodiment of the present invention, in the embodiment of the present invention, not the router of All Ranges all can configure the corresponding relation between topology mark in publishing region, but is only enabling after topology provided by the invention is issued characteristic just can to configure the corresponding relation between topology mark in publishing region; And for the router that does not enable this topology issue characteristic, can be according to existing method processing, i.e. only publishing region configuration.Certainly,, as the one expansion of the embodiment of the present invention, the embodiment of the present invention also can be given tacit consent to all-router and enable topology issue characteristic provided by the invention.Concrete condition concrete analysis, does not specifically limit here.
It should be noted that, if in step 301, if receiving, the first border router do not enable topology while issuing the area configurations that the router of characteristic issues, the corresponding relation between area configurations and default value that to give tacit consent to corresponding relation that this router issues be this issue.Such as, do not enable topology while issuing the area configurations that the border router of characteristic issues if received, the corresponding relation between area configurations and default value that to give tacit consent to corresponding relation that this border router issues be this issue.Afterwards, for this corresponding relation, execution step 302.
In above-mentioned flow process, when step 302 specific implementation, can realize by following step: collect area configurations corresponding to each topology mark that other border routers are issued, and leave in table 1; Collect area configurations corresponding to each topology mark that level-1 router is issued, and leave in table 2; For each the topology mark in table 1, if also there is this topology mark in table 2, in table 1, determine that this topology identifies corresponding area configurations, for each area configurations, if this area configurations also exists this topology in table 2 to identify in corresponding area configurations, perform step 303, otherwise, execution step 304, generates the operation of an Att mark according to this area configurations; And if in table 2, there is not this topology mark, directly perform step 304, generate the operation of an Att mark according to each area configurations corresponding to this topology mark in table 2.
The method above embodiment of the present invention being provided is described, and the device below embodiment of the present invention being provided is described.
Referring to Fig. 5, the structure drawing of device that Fig. 5 provides for the embodiment of the present invention.As shown in Figure 5, this device can comprise:
Receiving element 501, for receiving the corresponding relation between area configurations and the topology mark that other border routers issue, and receives the corresponding relation between area configurations and the topology mark that the lower level-1 router of hanging issues;
Preferably, in the present embodiment, the corresponding relation that receiving element 501 receives is to be carried in the V field of TLV field to issue; Wherein, the T field in described TLV field is different from the T field of the existing TLV field for publishing region configuration.
Preferably, processing unit 503 further sends to level-1 router by the topology mark in this corresponding relation and the first mark generating; So, the default route that described level-1 router generates sensing the first border router according to an Att mark comprises: level-1 router receives after topology mark and an Att mark, judge and self whether support this topology mark, if so, generate according to a described Att mark default route that points to the first border router; Otherwise the topology that abandons this reception identifies and an Att mark.
In the present embodiment, if the judged result of judging unit 502 is yes, processing unit 503 further generates the 2nd Att mark, so that the level-1 router of lower extension does not generate the default route that points to the first border router according to described the 2nd Att mark.
Preferably, in the present embodiment, other border routers, and level-1 router is at the corresponding relation having enabled between the configuration of publishing region after topological issue characteristic and topology mark; If receiving element 501 receives while not enabling to issue the area configurations that the router of characteristic issues, the corresponding relation between area configurations and default value that to give tacit consent to corresponding relation that this router issues be this issue.
As can be seen from the above technical solutions, in the present invention, receive the corresponding relation between area configurations and the topology mark that other border routers issue by the first border router, and receive the corresponding relation between area configurations and the topology mark that the lower level-1 router of hanging issues; Each corresponding relation of issuing for other border routers, judge level-1 router issue corresponding relation in whether there is this corresponding relation, if not, generate an Att mark according to the area configurations in corresponding relation, generate according to a described Att mark default route that points to the first border router for the level-1 router of lower extension.That is to say, the present invention is in the time generating Att mark, and not merely comparison domain configuration, has also considered topological mark, and this can solve prior art and can not generate but area configurations is identical due to different topology the problem of necessary default route;
Further, level-1 router is receiving after topology mark and an Att mark, not directly generates default route, but judges self whether to support this topology mark, if so, generate according to a described Att mark default route that points to the first border router; Otherwise, abandoning topology mark and an Att mark of this reception, this can ensure can not generate in region unnecessary default route.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (10)
1. more than, a definite method for topological lower area associated bit Att mark, is characterized in that, the method comprises:
A, the first border router receives the corresponding relation between area configurations and the topology mark that other border routers issue, and receives the corresponding relation between area configurations and the topology mark that the lower level-1 router of hanging issues;
B, each corresponding relation that described the first border router is issued for other border routers, judge level-1 router issue corresponding relation in whether there is this corresponding relation, if not, generate an Att mark according to the area configurations in corresponding relation, generate according to a described Att mark default route that points to the first border router for the level-1 router of lower extension.
2. method according to claim 1, is characterized in that, the corresponding relation in described steps A is carried in the V field of TLV field and issues; Described TLV field is for the corresponding relation between publishing region configuration and topological representation, comprise T field, V field and L field, wherein, T field is different from the T field of the existing TLV field for publishing region configuration, V field is for bearing area configuration and topological representation, and L field is for representing the message length of V field carrying.
3. method according to claim 1, is characterized in that, the described area configurations according in corresponding relation generates an Att mark and further comprises: the topology mark in this corresponding relation and the first mark generating are sent to level-1 router;
The default route that described level-1 router generates sensing the first border router according to an Att mark comprises: level-1 router receives after topology mark and an Att mark, judge and self whether support this topology mark, if so, generate according to a described Att mark default route that points to the first border router; Otherwise the topology that abandons this reception identifies and an Att mark.
4. method according to claim 1, is characterized in that, in described step B, if judged result is yes, further comprises:
Generate the 2nd Att mark, so that the level-1 router of lower extension does not generate the default route that points to the first border router according to described the 2nd Att mark.
5. method according to claim 1, is characterized in that, in described steps A, if the topology mark in the corresponding relation that the first border router is not supported to receive further comprises: abandon this corresponding relation.
6. method according to claim 1, is characterized in that, described other border routers, and level-1 router is at the corresponding relation having enabled between the configuration of publishing region after topological issue characteristic and topology mark;
If receiving, described the first border router do not enable topology while issuing the area configurations that the router of characteristic issues, the corresponding relation between area configurations and default value that to give tacit consent to corresponding relation that this router issues be this issue.
7. a determining device for topological lower area associated bit Att mark more than, this device is the border router in region; It is characterized in that, this device comprises:
Receiving element, for receiving the corresponding relation between area configurations and the topology mark that other border routers issue, and receives the corresponding relation between area configurations and the topology mark that the lower level-1 router of hanging issues;
Judging unit, for each corresponding relation of issuing for other border routers, judge in the corresponding relation of level-1 router issue whether have this corresponding relation;
Processing unit, when being no in described judging unit judged result, generates an Att mark according to the area configurations in corresponding relation, generates the default route that points to the first border router for the level-1 router of lower extension according to a described Att mark.
8. device according to claim 7, is characterized in that, the corresponding relation that described receiving element receives is to be carried in the V field of TLV field to issue; Described TLV field is for the corresponding relation between publishing region configuration and topological representation, comprise T field, V field and L field, wherein, T field is different from the T field of the existing TLV field for publishing region configuration, V field is for bearing area configuration and topological representation, and L field is for representing the message length of V field carrying.
9. device according to claim 8, is characterized in that, described processing unit further sends to level-1 router by the topology mark in this corresponding relation and the first mark generating;
The default route that described level-1 router generates sensing the first border router according to an Att mark comprises: level-1 router receives after topology mark and an Att mark, judge and self whether support this topology mark, if so, generate according to a described Att mark default route that points to the first border router; Otherwise the topology that abandons this reception identifies and an Att mark; And/or,
If the judged result of described judging unit is yes, described processing unit further generates the 2nd Att mark, so that the level-1 router of lower extension does not generate the default route that points to the first border router according to described the 2nd Att mark.
10. device according to claim 7, is characterized in that, described other border routers, and level-1 router is at the corresponding relation having enabled between the configuration of publishing region after topological issue characteristic and topology mark;
If described receiving element receives while not enabling to issue the area configurations that the router of characteristic issues, the corresponding relation between area configurations and default value that to give tacit consent to corresponding relation that this router issues be this issue.
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