CN101420443A - Method and equipment for preventing loop detection information loss in BGP routing - Google Patents
Method and equipment for preventing loop detection information loss in BGP routing Download PDFInfo
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Abstract
The present invention discloses a method for preventing information loss of loop detection of border gateway protocol and a device thereof. The method according to the invention comprises the following steps: generating an ISIS routing which carries AS-path property content of BGP routing when a network device injects BGP routing into an ISIS network, and releasing the ISIS routing into the ISIS network; receiving the ISIS routing from the ISIS network by a random network device and determining whether the AS-path property content carried by the received ISIS routing comprises the AS mark of the AS in which the AS-path is; and if the AS-path property content does not comprise the AS mark, allowing injecting the received ISIS routing into the BGP network and generating the BGP routing in injecting, wherein the AS-path property content of the BGP routing is the AS-path property content carried by the ISIS routing. Thus the loop detection information will not lost when the BGP routing traverses the ISIS network.
Description
Technical field
The present invention relates to the network communications technology, be specifically related to the equipment that method that a kind of BGP of preventing (Border GatewayProtocol, Border Gateway Protocol) loop detection information loses and a kind of BGP of preventing loop detection information are lost.
Background technology
ISIS (Intermediate System-to-Intermediate System intra-domain routinginformation exchange protocol, Routing Information Exchange agreement in the territory of Intermediate System-to-Intermediate System) is Routing Protocol between a kind of autonomous system inside, in carrier network, is used widely.BGP is the Routing Protocol of dynamic exchange routing iinformation between the autonomous system, in catenet such as obtaining using very widely in MPLS (Multiple Protocol Label Switch, the multiprotocol label transmit) core network.As two kinds of important Routing Protocols, ISIS and BGP are used through regular meeting between the two, use bgp protocol such as service provider inside, use the ISIS agreement between service provider and the client.
In the route technology field, avoiding loop is the problem that network design need be paid close attention to.At present, a lot of Routing Protocols all have the mechanism of avoiding loop to produce, for example bgp protocol.As everyone knows, bgp protocol is by AS-Path (autonomous system path) attribute of identification as loop detection information, prevent route loop, it is specially: the network equipment is checked the AS-Path attribute of BGP route, if comprise this network equipment place AS (AutonomousSystem in the AS-Path attribute after receiving a BGP route, autonomous system) AS number, think that then loop produces, abandon this BGP route, reach the purpose that prevents route loop.
The loop avoidance mechanism of each Routing Protocol can be brought into play good effect in each automatic network.In real network, the use of often interosculating of multiple Routing Protocol forms hybrid network but as previously mentioned.When routing iinformation passes through the network that adopts different routing protocol, for example bgp network is to the ISIS network, because the switching of Routing Protocol, be used in the bgp network preventing that the important information AS-Path attribute that loop produces from will lose, when after this routing iinformation passes through the ISIS network, getting back to bgp network so, because losing of AS-Path attribute information may cause loop to occur.
The typical case that multiple Routing Protocol is used in combination in the example prior art as shown in Figure 1 uses: MPLSVPN (Virtual Private Network, Virtual Private Network).Wherein, CE (Customer Edge, user network boundary device) 1, CE2 and CE3 belong to VPN1.PE (Provider Edge, service provider edge router) 1, PE2 and PE3 belong to AS100.Be IBGP agreement exchanging routing information by Interior Border Gateway Protocol between each PE, between CE2 and the CE3 by IGP (interiorgateway protocol, Interior Gateway Protocol) exchanging routing information, with IGP be here ISIS for example.
Suppose that CE1 is distributed to PE1 in the AS100 with route, PE1 adopts the IBGP agreement that route is distributed to PE2.What at this moment, PE2 received is the BGP route.Then, PE2 injects (inject) ISIS network (VPN1 at Fig. 1 CE2 place) with the BGP route, thereby is published to CE2, and the route to CE1 has just been arranged on CE2 like this.Wherein, what is called is injected the ISIS network with the BGP route and is meant: the routing iinformation that will adopt bgp protocol to describe is introduced (import) ISIS, making it becomes the routing iinformation that adopts the ISIS protocol description, and its effect is that the routing iinformation of PE2 place network A S100 is passed to CE2 place network VPN1.Described introducing and injection are the operation of RFC (Request For Comments) document definition.
In actual deployment, generally can there be a backdoor (back door) link between the CE, for example the IGP link between CE2 and the CE3 among Fig. 1.Under normal circumstances, CE2 transmits by PE2 to the flow of CE1, and CE3 transmits by PE3 to the flow of CE1.If the PE3 fault, then CE3 can arrive CE1 to CE2 by above-mentioned backdoor link again to the flow of CE1; If the PE2 fault, then CE2 can arrive CE1 to CE3 by above-mentioned backdoor link again to the flow of CE1, guarantees to transmit successfully.
But the existence of this backdoor link just may bring route loop.Still referring to Fig. 1, suppose to have the route N of a CE1 to be sent to PE2, after this route N was injected into the ISIS network by PE2, follow-up sending direction was: CE2 (passing through ISIS) → CE3 (passing through ISIS) → PE3 (passing through BGP) → PE2 (passing through ISIS) → CE2.Owing to lost the AS-Path attribute in the transmittance process of route N from PE2 to CE2, therefore when route N got back to AS100 by PE3 again, PE2 and PE3 can not carry out loop detection according to the AS-Path attribute, can form tangible loop.
In fact, be not only the MPLS network, in common IP network, as long as the network equipment moves ISIS agreement and bgp protocol simultaneously, and these two Routing Protocols are used in combination, and such problem all can occur: when the BGP route was injected into the ISIS network, the loop detection information AS-Path of BGP route lost, cause the BGP route to be passed through and lack the loop detection condition when ISIS network is got back to the BGP field once more, thereby appearance produces the possibility of route loop.
Summary of the invention
In view of this, the invention provides a kind of method and a kind of equipment that prevents that the Border Gateway Protocol loop detection information from losing that prevents that the Border Gateway Protocol loop detection information from losing, assurance BGP route can not lost loop detection information when passing through the ISIS network.
The present invention prevents the method that the Border Gateway Protocol loop detection information is lost, and is applicable to the hybrid network of Routing Information Exchange agreement ISIS in the territory of application boundary gateway protocol BGP and Intermediate System-to-Intermediate System, and this method comprises:
When the network equipment injects the ISIS network with the BGP route, generate the ISIS route of the autonomous system path AS-path property content of carrying described BGP route, and be published in the ISIS network;
The network equipment receives the ISIS route from the ISIS network, judges whether AS-path property content that the ISIS route that receives is carried comprises the autonomous system number of place autonomous system; If comprise, do not allow that then institute is received the ISIS route and inject bgp network; Otherwise the ISIS route that allows to be received is injected bgp network, generates the BGP route when injecting, the AS-path property content of this BGP route by the reception ISIS route AS-path property content of carrying.
Wherein, described generation is carried after the ISIS route of AS-path property content of described BGP route, and further comprise: the AS-path property content that the ISIS route is carried is kept in the extend information storehouse of the network equipment as extend information.
Wherein, be distributed to carry the AS-path property content when ISIS route in the ISIS network spreads in the ISIS network.
Preferably, the ISIS route is carried the mode of AS-path property content and is: carry the AS-path property content in being arranged at the cross-domain subtype length value BGP-AS SUB-TLV field of ISIS route message.
Preferably, described BGP-AS SUB-TLV field comprises type field, length field and codomain; The value of described codomain is the AS-path property content.
The present invention prevents the equipment that the Border Gateway Protocol loop detection information is lost, and comprising:
The BGP routing processing unit when being used for BGP route injection ISIS network, generating the ISIS route of the AS-path property content of carrying described BGP route, and is published in the ISIS network;
The ISIS routing processing unit is used to receive the ISIS route from the ISIS network, judges whether AS-path property content that the ISIS route that receives is carried comprises the autonomous system number of place autonomous system; If comprise, do not allow that then institute is received the ISIS route and inject bgp network; Otherwise the ISIS route that allows to be received is injected bgp network, generates the BGP route when injecting, the AS-path property content of this BGP route by the reception ISIS route AS-path property content of carrying.
Described BGP routing processing unit is further used for, and the AS-path property content that the ISIS route that generates is carried is kept in the extend information storehouse of place equipment as extend information.
The mode that described BGP routing processing unit makes the ISIS route carry the AS-path property content is: generate ISIS route message, carry the AS-path property content of described BGP route in being arranged at the BGP-AS SUB-TLV field of this ISIS route message.
According to above technical scheme as seen, the present invention is when carrying out BGP to the conversion of ISIS, the AS-path attribute of BGP route is together issued with the ISIS route, and when carrying out ISIS to the conversion of BGP, the AS-path attribute that the ISIS route is carried reverts to the attribute of BGP route.Like this, in the mutual introducing process of BGP route and ISIS route, guarantee that the AS-path attribute can not lose when passing through the ISIS network.Can either satisfy actual networking needs, prevent that loop from producing, and can make full use of the characteristics that BGP prevents loop again.Simultaneously, this scheme realizes simple, can reduce the cost of disposing and safeguarding, has greatly improved the ability that hybrid network prevents route loop.Simultaneously, the present invention is also before the ISIS route is injected bgp network, check whether the BGP-AS SUB-TLV field that the ISIS route is carried comprises local AS number, if comprise then think the generation loop, the injection of refusal ISIS route, thereby, stop the possibility that loop produces at the intersection of ISIS network and bgp network.
The present invention has also defined a kind of ISIS Sub-TLV message field (MFLD) of newtype, and promptly BGP-ASSUB-TLV is used to carry the AS-Path attribute of BGP route.The mode that adopts BGP-AS SUB-TLV field to carry the AS-Path attribute realizes simply, is applicable to the hybrid network of various application BGP and ISIS Routing Protocol, comprises IP network and MPLS network, and is applicable to IPv6.
Description of drawings
Fig. 1 for multiple Routing Protocol in the prior art in conjunction with the schematic diagram that is applied among the MPLS VPN.
Fig. 2 prevents the method flow diagram that the BGP loop detection information is lost in the embodiment of the invention.
Fig. 3 prevents the device structure schematic diagram that the BGP loop detection information is lost in the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing embodiment that develops simultaneously, describe the present invention.
The scheme that the present invention loses for a kind of BGP of preventing loop detection information, its basic thought is: when the network equipment injected the ISIS network with the BGP route, the AS-path property content that makes the ISIS route carry the BGP route was together issued;
When after the ISIS route of carrying the AS-path property content is passed through the ISIS network, arriving bgp network again, the network equipment that at first receives the ISIS route detects the AS-path property content that this ISIS route is carried, if this AS-path property content comprises AS number of network equipment place AS, then be considered as loop and produce, institute is not received the ISIS route and inject bgp network; If do not comprise, permission will receive the ISIS route and inject bgp network; When injecting, generate the BGP route, the AS-path property content of this BGP route by the reception ISIS route AS-path property content of carrying, thereby the AS-path property content that the ISIS route is carried is reverted to the attribute of BGP route.
Like this, in the mutual introducing process of BGP route and ISIS route, guarantee that the AS-path attribute do not lose, thereby guarantee that the BGP route when passing through the ISIS network, can not lose loop detection information AS-path, thereby prevent that loop from producing.And, stop the possibility that loop produces at the intersection of ISIS network and bgp network.
Technical scheme of the present invention goes for the various hybrid networks that are used in combination bgp protocol and ISIS agreement, for example IP network and MPLS network, and be applicable to IPv6.As long as the network equipment of this scheme of enforcement operation bgp protocol and ISIS agreement.
When the ISIS route is carried the AS-path property content of BGP route, the AS-path property content can be carried in the reserved field of ISIS route message, also can be carried in the spare bits of existing field in the ISIS route message.
In the RFC5305 technical documentation, defined a kind of field in the ISIS route message: subtype length value (Sub-TLV) field.This Sub-TLV field is included in the TLV field of ISIS route message, is used to describe the extend information of ISIS route message.For example, type is that 135 TLV field can be carried one or more Sub-TLV, and each Sub-TLV comprises that again length (Length) territory and 0 of type (Type) territory of a byte, a byte is to multibyte value (Value) territory.Wherein, the length of length (Length) domain representation codomain can be 4 bytes or 2 bytes.RFC has defined multiple Sub-TLV at present.
The embodiment of the invention defines a kind of new Sub-TLV field: BGP-AS SUB-TLV, be called cross-domain subtype length value field, and be used for preserving the AS-path property content of BGP route at ISIS route message.It is in 135 the TLV field, also can be carried in the TLV field of other type that BGP-AS SUB-TLV can be carried at type.The form of this BGP-AS SUB-TLV and existing Sub-TLV are similar, have type field, length field and codomain equally.Table 1 is the form signal of BGP-AS SUB-TLV in the embodiment of the invention.
| Type (Type) | Length (Length) | Value (Value) |
| 12 | 4 | BGP AS number |
Table 1
As shown in table 1, the value of type field is the preset value that does not conflict with the existing value of RFC document definition among the BGP-AS SUB-TLV, and present embodiment chooses 12; The value of length field is 4, and the length of codomain is 4 bytes in the expression BGP-ASSUB-TLV field because the AS of BGP number the longest be 4 bytes; Codomain is inserted BGP AS number, and this BGP AS number the AS-path attribute from the BGP route obtains.Each BGP-AS SUB-TLV describes separately an AS information, if the AS-path attribute of BGP route comprise a plurality of AS numbers, then need to adopt a plurality of BGP-AS SUB-TLV to describe.
Below in conjunction with Fig. 2 the execution mode that adopts BGP-AS SUB-TLV to carry the AS-path property content is described in detail.As shown in Figure 2, this execution mode may further comprise the steps:
Step 201: when the network equipment 1 injects the ISIS network with the BGP route, obtain the AS-path property content in this BGP route, the AS-path property content of obtaining is added in the BGP-AS SUB-TLV field of ISIS route message.Form shown in this BGP-AS SUB-TLV field employing table 1, wherein the value of codomain is the AS-path property content of obtaining.
Step 202: the network equipment 1 is kept at BGP-AS SUB-TLV field contents in the extend information storehouse of the network equipment 1 as extend information, so that send corresponding BGP-AS SUB-TLV field when distributing the ISIS route later on simultaneously.
Step 203: the network equipment 1 is published to the ISIS route message that generates in the ISIS network.ISIS route message all carries BGP-AS SUB-TLV, i.e. the AS-path information of BGP route when the ISIS network spreads.
Step 204: after the network equipment 2 receives ISIS route message from the ISIS network, judge whether the BGP-AS SUB-TLV information in the ISIS route message of receiving comprises AS number of the network equipment 2 place autonomous systems; If comprise, then execution in step 205; Otherwise, execution in step 206.
Wherein, the network equipment 1 and 2 can be same equipment or distinct device.
Step 205: determine to produce loop, do not allow the ISIS route in the reception ISIS route message is injected bgp network.At this moment, can abandon the ISIS route that is received.This flow process finishes.
Step 206: allow the injection of the ISIS route in receives ISIS route message bgp network, when injection, revert to the AS-path property content of BGP route BGP-AS SUB-TLV field in the reception ISIS route message is comprised AS number.This flow process finishes.
In practice, if ISIS route message does not carry BGP-AS SUB-TLV field, then carry out existing implant operation according to ISIS route message.
According to above-mentioned flow process, adopt the processing method of Fig. 2, the BGP route is after passing through the ISIS network, its loop detection information AS-path attribute is not lost, after guaranteeing that the BGP route is passed through the ISIS network and got back to the BGP field, still can carry out loop detection, prevent that loop from producing according to passing through ISIS network AS-path attribute before.
Cite an actual example below.
Still adopt the network configuration of Fig. 1, the VPN1 of Fig. 1 middle and lower part adopts ISIS as the route switching agreement.Suppose that CE1 sends a route N, route N can be the CE route;
Route N at first arrives PE1, and PE1 is incorporated into BGP with route N and sends to PE2, this moment route N to carry the AS-path attribute be 100;
In PE2, when route N is injected into the ISIS network, generate the ISIS route, this ISIS route is carried a BGP-AS SUB-TLV field, and type is 12, and length is 4 bytes, and value is 100; The BGP-AS SUB-TLV field that routing management module (RM) among the while PE2 carries the ISIS route is kept in the local extend information storehouse as extend information;
The ISIS route in the diffusion process from CE2 to CE3, can be carried BGP-ASSUB-TLV in the ISIS network, promptly carry the AS-path information of BGP route;
When the ISIS route is injected into bgp network once more on PE3 when, PE3 at first carries out the loop inspection, promptly check the BGP-AS SUB-TLV field that the ISIS route is carried, if this field has comprised AS number of PE3 this locality, promptly 100, then be considered as loop and produce, this ISIS route is not injected in the bgp network; Otherwise, then this ISIS route is injected in the bgp process, and makes the BGP route of generation carry the AS-path information consistent with BGP-AS SUB-TLV.
In this example, comprise AS number of AS100 owing to the BGP-AS SUB-TLV field of carrying from the ISIS route of CE3: 100, so can being considered as loop, PE3 produces, this ISIS route is not injected in the bgp network, thereby has avoided the loop generation.
For the method that realizes that the above-mentioned BGP of preventing loop detection information is lost, the invention provides the equipment that a kind of BGP of preventing loop detection information is lost.Fig. 3 prevents the device structure schematic diagram that the BGP loop detection information is lost for this.As shown in Figure 3, this equipment is applicable to the network of using BGP and ISIS, comprises BGP routing processing unit 31 and ISIS routing processing unit 32.Wherein,
BGP routing processing unit 31 when being used for BGP route injection ISIS network, generating the ISIS route of the AS-path property content of carrying this BGP route, and is published in the ISIS network.In one embodiment, BGP routing processing unit 31 generates ISIS route message, carries the AS-path property content of BGP route in being arranged at the BGP-AS SUB-TLV field of this ISIS route message.BGP-AS SUB-TLV field specifically can adopt the form of aforementioned table 1.This BGP routing processing unit 31 further is kept at the AS-path property content that the ISIS route that generates is carried in the extend information storehouse (not shown among Fig. 3) of place equipment as extend information.
ISIS routing processing unit 32 is used to receive the ISIS route from the ISIS network, judges whether AS-path property content that the ISIS route that receives is carried comprises the autonomous system number of place autonomous system; If comprise, then determine to produce loop, do not allow that institute is received the ISIS route and inject bgp network; Otherwise the ISIS route that allows to be received is injected bgp network, generates the BGP route when injecting, the AS-path property content of this BGP route by the reception ISIS route AS-path property content of carrying.
Prevent that in Fig. 1 the equipment that the BGP loop detection information is lost from being PE2 and PE3.Just in the embodiment of the invention, PE2 only relates to the function of BGP routing processing unit 31, and PE4 only relates to the function of ISIS routing processing unit 32.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1, a kind of method that prevents that the Border Gateway Protocol loop detection information from losing is applicable to the hybrid network of Routing Information Exchange agreement ISIS in the territory of application boundary gateway protocol BGP and Intermediate System-to-Intermediate System to it is characterized in that this method comprises:
When the network equipment injects the ISIS network with the BGP route, generate the ISIS route of the autonomous system path AS-path property content of carrying described BGP route, and be published in the ISIS network;
The network equipment receives the ISIS route from the ISIS network, judges whether AS-path property content that the ISIS route that receives is carried comprises the autonomous system number of place autonomous system; If comprise, do not allow that then institute is received the ISIS route and inject bgp network; Otherwise the ISIS route that allows to be received is injected bgp network, generates the BGP route when injecting, the AS-path property content of this BGP route by the reception ISIS route AS-path property content of carrying.
2, the method for claim 1, it is characterized in that, described generation is carried after the ISIS route of AS-path property content of described BGP route, and further comprise: the AS-path property content that the ISIS route is carried is kept in the extend information storehouse of the network equipment as extend information.
3, method as claimed in claim 2 is characterized in that, is distributed to and carries the AS-path property content when ISIS route in the ISIS network spreads in the ISIS network.
As claim 1 or 2 or 3 described methods, it is characterized in that 4, the mode that the ISIS route is carried the AS-path property content is:
In being arranged at the cross-domain subtype length value BGP-AS SUB-TLV field of ISIS route message, carry the AS-path property content.
5, method as claimed in claim 4 is characterized in that, described BGP-AS SUB-TLV field comprises type field, length field and codomain; The value of described codomain is the AS-path property content.
6, a kind of equipment that prevents that the Border Gateway Protocol loop detection information from losing is applicable to the hybrid network of using BGP and ISIS, it is characterized in that this equipment comprises:
The BGP routing processing unit when being used for BGP route injection ISIS network, generating the ISIS route of the AS-path property content of carrying described BGP route, and is published in the ISIS network;
The ISIS routing processing unit is used to receive the ISIS route from the ISIS network, judges whether AS-path property content that the ISIS route that receives is carried comprises the autonomous system number of place autonomous system; If comprise, do not allow that then institute is received the ISIS route and inject bgp network; Otherwise the ISIS route that allows to be received is injected bgp network, generates the BGP route when injecting, the AS-path property content of this BGP route by the reception ISIS route AS-path property content of carrying.
7, equipment as claimed in claim 6 is characterized in that, described BGP routing processing unit is further used for, and the AS-path property content that the ISIS route that generates is carried is kept in the extend information storehouse of place equipment as extend information.
8, as claim 6 or 7 described equipment, it is characterized in that, the mode that described BGP routing processing unit makes the ISIS route carry the AS-path property content is: generate ISIS route message, carry the AS-path property content of described BGP route in being arranged at the BGP-AS SUB-TLV field of this ISIS route message.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106330693A (en) * | 2015-06-19 | 2017-01-11 | 中兴通讯股份有限公司 | Configuration method and device for autonomous system path (AS-PATH) of BGP (Border Gateway Protocol) routing |
| WO2020181881A1 (en) * | 2019-03-11 | 2020-09-17 | 华为技术有限公司 | Bgp route identification method, apparatus and device |
| CN113261246A (en) * | 2019-12-10 | 2021-08-13 | 华为技术有限公司 | Method, device and system for reducing routing loop |
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- 2008-12-15 CN CNA2008102396991A patent/CN101420443A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106330693A (en) * | 2015-06-19 | 2017-01-11 | 中兴通讯股份有限公司 | Configuration method and device for autonomous system path (AS-PATH) of BGP (Border Gateway Protocol) routing |
| CN106330693B (en) * | 2015-06-19 | 2021-01-26 | 中兴通讯股份有限公司 | BGP routing autonomous domain PATH AS-PATH configuration method and device |
| WO2020181881A1 (en) * | 2019-03-11 | 2020-09-17 | 华为技术有限公司 | Bgp route identification method, apparatus and device |
| CN111698189A (en) * | 2019-03-11 | 2020-09-22 | 华为技术有限公司 | BGP route identification method, device and equipment |
| CN111698189B (en) * | 2019-03-11 | 2021-12-14 | 华为技术有限公司 | BGP route identification method, device and equipment |
| CN114363003A (en) * | 2019-03-11 | 2022-04-15 | 华为技术有限公司 | BGP route identification method, device and equipment |
| CN114363003B (en) * | 2019-03-11 | 2024-01-02 | 华为技术有限公司 | BGP route identification method, device and equipment |
| US11936551B2 (en) | 2019-03-11 | 2024-03-19 | Huawei Technologies Co., Ltd. | BGP route identification method, apparatus, and device |
| CN113261246A (en) * | 2019-12-10 | 2021-08-13 | 华为技术有限公司 | Method, device and system for reducing routing loop |
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Open date: 20090429 |