CN101729422B - Method and device for realizing QoS (Quality of Service) by utilizing BGP (Border Gateway Protocol) - Google Patents
Method and device for realizing QoS (Quality of Service) by utilizing BGP (Border Gateway Protocol) Download PDFInfo
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Abstract
The invention discloses a method for realizing QoS in a MPLS L3VPN private network by utilizing BGP, which comprises the following steps of: receiving a BGP route announcement message sent by an outlet LER by an inlet LER (Label Edge Router), wherein the BGP route announcement message carries a corresponding EXP (Export) value of a data stream reaching to a destination IP address, wherein the destination IP address is an MPLS L3VPN private network address; establishing a corresponding relation list item of the EXP value and the destination IP address by the inlet LER; and after the inlet LER receives the data stream, searching the corresponding relation list item according to the destination IP address of the data stream, determining the corresponding EXP value and using the EXP value as a tag of the data stream. In the invention, the QoS requirement of a route announcement side PE is flexibly embodied in MPLS L3VPN (Multiple Protocol Label Switching L3 Virtual Private Network) networking to carry out end-to-end QoS disposition, and simultaneously the cost and the flexibility of the QoS disposition are markedly improved.
Description
Technical field
The present invention relates to communication technical field, relate in particular to method and device that a kind of BGP of utilization realizes MPLS L3VPN private network QoS.
Background technology
MPLS (Multiprotocol Label Switching, multiprotocol label switching) QoS (Quality of Service, service quality) disposes the professional important component part of QoS, in the MPLS of reality networking, often implements QoS through the differential service model.
The difference of MPLS QoS and Traditional IP QoS is: traditional I P QoS judges the professional grade of service according to the priority of IP, realizes differential service; MPLS QoS then need distinguish different data flow according to EXP (Experimental Use, experiment is used) value, realizes differential service, guarantees voice, the low delay of video data stream, low packet loss ratio, guarantees the high usage of network.
The function of MPLS QoS is as required at PE (Provider Edge; Service provider edge router) upward data stream is classified; For example; Can be that 1 data flow is divided into one type with the EXP value, the EXP value be that 2 data flow is divided into one type, and sorted data flow is carried out traffic policing and heavy label.Specifically be embodied as: PE is when adding Label to message, and the IP precedence mark that carries the IP message is mapped to the EXP territory of label, carries the type information that former cause IP carries by label; Between P router and PE,, carry out differentiated scheduling according to the EXP territory of label; Like PQ (Priority Queuing; Priority queueing), WFQ (Weighted Fair Queuing, Weighted Fair Queuing), CBQ (Class Based Queueing, class-based formation) etc.; The data flow that promptly goes up to carrying label at a LSP (Label Switching Path, label switched path) provides differentiated QoS.
In the prior art; There are two kinds of fill methods in MPLS EXP territory: first kind is that data flow is when getting into the MPLS forwarded; With the QoS information in the former heading; Like information such as IP DSCP (Differentiated Services Code Point, differential service coding main points), IP precedence (priority), 802.1P, copy to the EXP territory in the MPLS heading; Second kind is data flow when getting into the MPLS forwarded, and network manager's manual configuration qos policy is rewritten particular value with the EXP territory.
If the network manager hopes to mate certain FEC (Forwarding Equivalence Class; Forwarding equivalence class) data flow is carried designated value when transmitting; Usually adopt second method; Promptly go up the configuration qos policy and rewrite the EXP value at inlet LER (Label Edge Router, tag edge router).Wherein FEC is for having the message of same characteristic features (for example destination identical or have a same services grade etc.), and the message that belongs to identical FEC will obtain identical processing in the MPLS network.
Yet prior art lacks the flexibility of disposing, and can't solve the demand that QoS disposes simultaneously.As shown in Figure 1; PE1 is as route transmitting terminal (data flow receiving terminal, outlet LER); Wherein, the route transmitting terminal is meant that PE1 sends the routing iinformation that arrives PE1 to PE2 and PE3, and the data flow receiving terminal is meant the data flow of reception from PE2 and PE3; Outlet LER is meant that PE1 is positioned at the MPLS network edge, will be forwarded to IP network from the data flow of PE2 and PE3.Can access higher Priority Service if hope for the ip-prefix1 corresponding service; Need (LER promptly enters the mouth at VPN route receiver side PE; For example PE2 and PE3) on carry out manual QoS and dispose: if from the data flow coupling prefix ip-prefix1 of CE2 or CE3, in the MPLS head, fill in the EXP value (the higher Priority Service of correspondence) of appointment.
Yet, when the PE quantity that receives the announcement of PE1 VPN route more for a long time, lower deployment cost obviously increases.When PE1 changed for the corresponding professional QoS of the VPN route of announcing, this variation need be made amendment at all receiver side PE.It is thus clear that prior art plan implementation cost is high, flexibility is very poor.
Summary of the invention
The invention provides method and device that a kind of BGP of utilization realizes MPLS L3VPN private network QoS, specific MPLS QoS networking lower deployment cost is reduced, management and adjustment flexibility all obviously improve.
The invention provides a kind of method of utilizing Border Gateway Protocol (BGP) to realize MPLS L3VPN private network service quality QoS; Be applied in the multiprotocol label switching MPLS network; Said MPLS network comprises outlet tag edge router LER and inlet LER, said method comprising the steps of:
Said inlet LER receives the bgp route advertisement message that said outlet LER sends, and said bgp route advertisement message carries the corresponding EXP value of data flow that arrives purpose IP address through MPLS; Wherein said purpose IP address is a MPLS L3VPN private net address;
Said inlet LER sets up the corresponding relation list item of said EXP value and purpose IP address;
Behind the said inlet LER receiving data stream,, confirm corresponding EXP value, said EXP value is set in the label of said data flow according to the said corresponding relation list item of the purpose IP address search of said data flow.
Said bgp route advertisement message carries the corresponding EXP value of data flow that arrives purpose IP address through MPLS, is specially:
In the lable field of said outlet LER in the MP_REACH_NLRI of Update message attribute said EXP is set.
In the said label that the EXP value is set to said data flow, specifically comprise:
Said inlet LER sets gradually said EXP value in the private network tags and public network label of MPLS heading, transmits to said outlet LER through the MPLS network.
In the said label that the EXP value is set to said data flow, also comprise afterwards:
Said outlet LER receives said data flow, removes the public network label;
Said outlet LER confirms the Virtual Private Network VPN that purpose IP address belongs to according to said private network tags;
Said outlet LER removes said private network tags, obtains data flow, sends to purpose IP address.
Also comprise:
Said outlet LER increases new purpose IP address, or when changing the grade of service of the data flow that arrives purpose IP address, sends the bgp route advertisement message to said inlet LER again, with the corresponding relation list item of renewal EXP value and purpose IP address.
The invention provides a kind of system that utilizes Border Gateway Protocol (BGP) to realize MPLS L3VPN private network service quality QoS, be applied in the multiprotocol label switching MPLS network, said MPLS system comprises outlet tag edge router LER and inlet LER,
Said outlet LER is used for the bgp route advertisement message to said inlet LER transmission, and said bgp route advertisement message carries the corresponding EXP value of data flow that arrives purpose IP address through MPLS;
Said inlet LER is used to receive the bgp route advertisement message that said outlet LER sends, and sets up the corresponding relation list item of said EXP value and purpose IP address; Behind receiving data stream; According to the said corresponding relation list item of the purpose IP address search of said data flow; Confirm corresponding EXP value, said EXP value is set gradually in the private network tags and public network label of MPLS heading of said data flow, to said outlet IER forwarding;
Wherein, said purpose IP address is a MPLS L3VPN private net address.
The invention provides a kind of inlet tag edge router LER, be applied in the multiprotocol label switching MPLS network, said MPLS network comprises outlet tag edge router LER and inlet LER, and said inlet LER comprises:
Receiver module is used to receive the bgp route advertisement message that said outlet LER sends, and said bgp route advertisement message carries the corresponding EXP value of data flow that arrives purpose IP address through MPLS;
Set up module, be connected, be used to set up the corresponding relation list item of said EXP value and purpose IP address with said receiver module;
Forwarding module is connected with the said module of setting up, be used for receiving data stream after; According to the said corresponding relation list item of the purpose IP address search of said data flow; Confirm corresponding EXP value, said EXP value is set in the label of said data flow, transmit to said outlet LER;
Wherein, said purpose IP address is a MPLS L3VPN private net address.
Said forwarding module specifically is used for said EXP value is set gradually the private network tags and the public network label of MPLS heading, transmits to said outlet LER through the MPLS network.
The invention provides a kind of outlet tag edge router LER, be applied in the multiprotocol label switching MPLS network, said MPLS network comprises outlet tag edge router LER and inlet LER, and outlet LER comprises:
The advertising of route sending module is used for the bgp route advertisement message to said inlet LER transmission, and said bgp route advertisement message carries the corresponding EXP value of data flow that arrives purpose IP address through MPLS;
Data forwarding module is used to receive the data flow of carrying public network label and private network tags, removes the public network label; Confirm the Virtual Private Network VPN that purpose IP address belongs to according to said private network tags; Remove said private network tags, obtain original data stream, send to purpose IP address;
Wherein, said purpose IP address is a MPLS L3VPN private net address.
Said advertising of route sending module specifically is used in the lable field of the MP_REACH_NLRI of Update message attribute, said EXP being set.
Said advertising of route sending module; Also be used to increase new purpose IP address; Or when change arriving the grade of service of data flow of purpose IP address, send the bgp route advertisement message to said inlet LER again, with the corresponding relation list item of renewal EXP value and purpose IP address.
Compared with prior art, the present invention has the following advantages:
Among the present invention, in MPLS L3VPN networking, embody the QoS demand of advertising of route side PE flexibly and carry out the end-to-end QoS deployment, the cost and the flexibility of QoS deployment simultaneously all obviously improve.
Description of drawings
Fig. 1 is a MPLS network structure in the prior art;
Fig. 2 is the method flow diagram that a kind of BGP of utilization realizes service quality QoS among the present invention;
Fig. 3 is a NLRI information format sketch map among the present invention;
Fig. 4 is a kind of inlet tag edge router LER structure chart among the present invention;
Fig. 5 is an another kind of outlet tag edge router LER structure chart among the present invention.
Embodiment
The present invention proposes a kind of method of utilizing Border Gateway Protocol (BGP) to realize service quality QoS; Be applied in the multiprotocol label switching MPLS network; Said MPLS network comprises outlet tag edge router LER and inlet LER, and wherein, LER includes but not limited to router, 3 layer switch etc.Said method is as shown in Figure 2, may further comprise the steps:
Step 201, said outlet LER sends the bgp route advertisement message to said inlet LER, and said bgp route advertisement message carries the corresponding EXP value of data flow that arrives purpose IP address; Be specially: in the lable field of said outlet LER in the MP_REACH_NLRI of Update message attribute said EXP is set.
In addition, outlet LER increases new purpose IP address, or when changing the grade of service of the data flow that arrives purpose IP address, sends the bgp route advertisement message to said inlet LER again, with the corresponding relation list item of renewal EXP value and purpose IP address.
Step 202, said inlet LER receives the bgp route advertisement message that said outlet LER sends, and obtains EXP in the lable field from the MP_REACH_NLRI attribute, sets up the corresponding relation list item of said EXP value and purpose IP address;
Step 203; Behind the said inlet LER receiving data stream,, confirm corresponding EXP value according to the said corresponding relation list item of the purpose IP address search of said data flow; Said EXP value is set in the label of said data flow; Be about to transmit to said outlet LER through the MPLS network in the private network tags and public network label that said EXP value sets gradually the MPLS heading, in the MPLS network, carry out corresponding forwarding preference strategy according to the EXP in the public network label.
Step 204, said outlet LER receives said data flow, removes the public network label; Confirm the Virtual Private Network VPN that purpose IP address belongs to according to said private network tags; Remove said private network tags, obtain data flow, send to purpose IP address.
Below with MPLS L3VPN (Level 3 virtual private network; Three layer virtual private network) is applied as the concrete handling process of example explanation; Still be that example describes entry PE can write down label value and EXP after receiving VPN route corresponding relation, get into the EXP value of just using among the corresponding MP_REACH_NLRI when mpls domain is transmitted as this FEC of flow matches and be filled up among the EXP of data message with Fig. 1.For example; PE1 needs higher priority service to the ip-prefix1 of vpn-instance (vpn instance) VPN1; During to PE2 and PE3 announcement BGP (Border Gateway Protocol, Border Gateway Protocol) route, it is non-0 value that the label field in the MP_REACH_NLRI of Update message attribute is provided with EXP at PE1; Occurrence is confirmed according to the Priority Service grade of ip-prefix1, is supposed to be set to 5.
MPLS L3VPN is a kind of L3VPN technology based on PE in service provider's vpn solution, uses BGP on service provider backbone, to issue the VPN route, uses MPLS on service provider backbone, to transmit the VPN message.BGP can add various information such as RD (Route Distinguisher, Route Distinguisher), label through MP-BGP when carrying out NLRI (Network Layer Reachability Information, Network Layer Reachable Information) information exchange; Form is as shown in Figure 3; Label is 24 bit, and is the same with the MPLS label, and preceding 20bit is concrete label value; 3bit is EXP, and 1bit is a mark at the bottom of the stack; Prefix RD is the 64bit+IP prefix.
PE2 and PE3 are when receiving that BGP route EXP is 5 label route; Receive when receiving the private network data flow from CE3 at PE2 from CE2 or PE3; Do not carry out IP DSCP of the prior art duplicating to label E XP; But will be filled up in the private network tags of MPLS heading through the EXP that VPN route agreement BGP obtains, soon EXP extends this as 5 in the private network tags of MPLS heading; Then; EXP value in the private network tags of MPLS heading is copied among the EXP in the public network label of MPLS heading; Be that EXP value in the public network label of MPLS heading is from private network tags; Also be 5, obtain corresponding service according to the EXP value in the public network label of MPLS heading when in whole M PLS territory, transmitting.The LER that promptly enters the mouth directly obtains the EXP value from the MP_REACH_NLRI information of BGP, do not need manually to go to specify one by one.
Wherein, under the vpnv4 view of route transmitting terminal PE1:
peer?x.x.x.x?vpn-instance?vpnx?ip-prefix?ip-prefix1?exp?5
Command interpretation: announcement peer x.x.x.x specifies VPNV4 neighbours, and vpn-instance vpnx specifies specific vrf, and ip-prefix ip-prefix1 specifies particular prefix need to confirm the route prefix of priority treatment.
Can realize through following reference command at route receiving terminal PE2 or PE3 side.
Under the VPNV4 view:
Label-exp?enable
Command interpretation: the characteristic of the EXP that enables from BGP_MP_REACH_NLRI, to obtain
Last example realizes the method for MPLS QoS for utilizing BGP among the MPLS L3VPN; L2VPN, 6PE (IPv6 Provider Edge in VPLS, Kompella mode; The IPv6 Provider Edge) similarly, can utilize method and thinking among the present invention fully in, outlet LER identifies concrete EXP value when be corresponding FEC distribution label; Infeed mouthful LER and when transmitting corresponding flow, utilize, and then realize that MPLS QoS disposes flexibly.Wherein, 6PE is a kind of application of IPv6 transitional technology, in existing IPv4 network, utilizes the MPLS tunneling technique for the local divided IPv6 network of difference connectivity services to be provided.
The invention provides a kind of system that utilizes Border Gateway Protocol (BGP) to realize service quality QoS, be applied in the multiprotocol label switching MPLS network, said MPLS network comprises outlet tag edge router LER and inlet LER,
Said outlet LER is used for the bgp route advertisement message to said inlet LER transmission, and said bgp route advertisement message carries the corresponding EXP value of data flow that arrives purpose IP address through MPLS;
Said inlet LER is used to receive the bgp route advertisement message that said outlet LER sends, and sets up the corresponding relation list item of said EXP value and purpose IP address; Behind receiving data stream, according to the said corresponding relation list item of the purpose IP address search of said data flow, confirm corresponding EXP value, said EXP value is set in the label of said data flow, transmit to said outlet LER.
The invention provides a kind of inlet tag edge router LER, be applied in the multiprotocol label switching MPLS network, said MPLS network comprises outlet tag edge router LER and inlet LER, and said inlet LER is as shown in Figure 4, comprising:
Set up module 420, be connected, be used to set up the corresponding relation list item of said EXP value and purpose IP address with receiver module 420;
The invention provides a kind of outlet tag edge router LER, be applied in the multiprotocol label switching MPLS network, said MPLS network comprises outlet tag edge router LER and inlet LER, and LER is as shown in Figure 5 in outlet, comprising:
Advertising of route sending module 510 is used for the bgp route advertisement message to said inlet LER transmission, and said bgp route advertisement message carries the corresponding EXP value of data flow that arrives purpose IP address through MPLS;
Data forwarding module 520 is used to receive said data flow of carrying public network label and private network tags, removes the public network label; Confirm the Virtual Private Network VPN that purpose IP address belongs to according to said private network tags; Remove said private network tags, obtain original data stream, send to purpose IP address.
Advertising of route sending module 510 specifically is used in the lable field of the MP_REACH_NLRI of Update message attribute, said EXP being set.
Advertising of route sending module 510; Also be used to increase new purpose IP address; Or when change arriving the grade of service of data flow of purpose IP address, send the bgp route advertisement message to said inlet LER again, with the corresponding relation list item of renewal EXP value and purpose IP address.
Through the description of above execution mode, those skilled in the art can be well understood to the present invention and can realize through hardware, also can realize by the mode that software adds necessary general hardware platform.Based on such understanding; Technical scheme of the present invention can be come out with the embodied of software product, this software product can be stored in a non-volatile memory medium (can be CD-ROM, USB flash disk; Portable hard drive etc.) in; Comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the sketch map of a preferred embodiment, module in the accompanying drawing or flow process might not be that embodiment of the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.
The invention described above sequence number is not represented the quality of embodiment just to description.
More than disclosedly be merely several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (9)
1. method of utilizing Border Gateway Protocol (BGP) to realize MPLS L3VPN private network service quality QoS; Be applied in the multiprotocol label switching MPLS network; Said MPLS network comprises outlet tag edge router LER and inlet LER, it is characterized in that, said method comprising the steps of:
Said inlet LER receives the bgp route advertisement message that said outlet LER sends, and said bgp route advertisement message carries the corresponding EXP value of data flow that arrives purpose IP address through MPLS; Wherein said purpose IP address is a MPLS L3VPN private net address;
Said inlet LER sets up the corresponding relation list item of said EXP value and purpose IP address;
Behind the said inlet LER receiving data stream,, confirm corresponding EXP value, said EXP value is set gradually in the private network tags and public network label of MPLS heading of said data flow according to the said corresponding relation list item of the purpose IP address search of said data flow.
2. the method for claim 1 is characterized in that, said bgp route advertisement message carries the corresponding EXP value of data flow that arrives purpose IP address through MPLS, is specially:
In the lable field of said outlet LER in the MP_REACH_NLRI of Update message attribute said EXP is set.
3. the method for claim 1 is characterized in that, in the said label that the EXP value is set to said data flow, also comprises afterwards:
Said outlet LER receives said data flow, removes the public network label;
Said outlet LER confirms the Virtual Private Network VPN that purpose IP address belongs to according to said private network tags;
Said outlet LER removes said private network tags, obtains data flow, sends to purpose IP address.
4. the method for claim 1 is characterized in that, also comprises:
Said outlet LER increases new purpose IP address, or when changing the grade of service of the data flow that arrives purpose IP address, sends the bgp route advertisement message to said inlet LER again, with the corresponding relation list item of renewal EXP value and purpose IP address.
5. a system that utilizes Border Gateway Protocol (BGP) to realize MPLS L3VPN private network service quality QoS is applied in the multiprotocol label switching MPLS network, and said MPLS system comprises outlet tag edge router LER and inlet LER, it is characterized in that,
Said outlet LER is used for the bgp route advertisement message to said inlet LER transmission, and said bgp route advertisement message carries the corresponding EXP value of data flow that arrives purpose IP address through MPLS;
Said inlet LER is used to receive the bgp route advertisement message that said outlet LER sends, and sets up the corresponding relation list item of said EXP value and purpose IP address; Behind receiving data stream; According to the said corresponding relation list item of the purpose IP address search of said data flow; Confirm corresponding EXP value, said EXP value is set gradually in the private network tags and public network label of MPLS heading of said data flow, to said outlet LER forwarding;
Wherein, said purpose IP address is a MPLS L3VPN private net address.
6. an inlet tag edge router LER is applied in the multiprotocol label switching MPLS network, and said MPLS network comprises outlet tag edge router LER and inlet LER, it is characterized in that, comprising:
Receiver module is used to receive the bgp route advertisement message that said outlet LER sends, and said bgp route advertisement message carries the corresponding EXP value of data flow that arrives purpose IP address through MPLS;
Set up module, be connected, be used to set up the corresponding relation list item of said EXP value and purpose IP address with said receiver module;
Forwarding module; Be connected with the said module of setting up; After being used for receiving data stream,, confirm corresponding EXP value according to the said corresponding relation list item of the purpose IP address search of said data flow; Said EXP value is set gradually in the private network tags and public network label of MPLS heading of said data flow, transmit to said outlet LER;
Wherein, said purpose IP address is a MPLS L3VPN private net address.
7. an outlet tag edge router LER is applied in the multiprotocol label switching MPLS network, and said MPLS network comprises outlet tag edge router LER and inlet LER, it is characterized in that, comprising:
The advertising of route sending module is used for the bgp route advertisement message to said inlet LER transmission, and said bgp route advertisement message carries the corresponding EXP value of data flow that arrives purpose IP address through MPLS;
Data forwarding module is used to receive the data flow of carrying public network label and private network tags, removes the public network label; Confirm the Virtual Private Network VPN that purpose IP address belongs to according to said private network tags; Remove said private network tags, obtain original data stream, send to purpose IP address;
Wherein, said purpose IP address is a MPLS L3VPN private net address.
8. LER as claimed in claim 7 is characterized in that, said advertising of route sending module specifically is used in the lable field of the MP_REACH_NLRI attribute of Up date message, said EXP being set.
9. LER as claimed in claim 7; It is characterized in that; Said advertising of route sending module also is used to increase new purpose IP address, or when change arriving the grade of service of data flow of purpose IP address; Again send the bgp route advertisement message to said inlet LER, to upgrade the corresponding relation list item of EXP value and purpose IP address.
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| CN102291297B (en) * | 2011-08-05 | 2017-08-25 | 中兴通讯股份有限公司 | Carry the implementation method and device of the MPLS network differential service of vpn service |
| CN102291471B (en) * | 2011-08-31 | 2015-12-02 | 杭州华三通信技术有限公司 | A kind of processing method of label relabeling and equipment |
| CN103067276B (en) * | 2012-12-31 | 2016-09-21 | 华为技术有限公司 | A kind of Apparatus for () and method therefor selecting link based on application layer protocol |
| CN106161245A (en) * | 2015-04-17 | 2016-11-23 | 中兴通讯股份有限公司 | The method and apparatus transmitting message in the Virtual Private Network of agreement label switched |
| CN109391561B (en) * | 2017-08-10 | 2022-09-30 | 中国电信股份有限公司 | Dynamic bidirectional guarantee method and system |
| CN109286566A (en) * | 2018-11-22 | 2019-01-29 | 盛科网络（苏州）有限公司 | Qos module classification realization method and system in Hybrid interchanger |
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| CN1507230A (en) * | 2002-12-10 | 2004-06-23 | ��Ϊ��������˾ | Method of realizing special multiple-protocol label exchanging virtual network |
| CN101494608A (en) * | 2009-03-11 | 2009-07-29 | 杭州华三通信技术有限公司 | Method and apparatus for setting multi-protocol label exchange message priority |
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| CN1507230A (en) * | 2002-12-10 | 2004-06-23 | ��Ϊ��������˾ | Method of realizing special multiple-protocol label exchanging virtual network |
| CN101494608A (en) * | 2009-03-11 | 2009-07-29 | 杭州华三通信技术有限公司 | Method and apparatus for setting multi-protocol label exchange message priority |
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