CN101252526A - Flow control method as well as VPWS network system - Google Patents
Flow control method as well as VPWS network system Download PDFInfo
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- CN101252526A CN101252526A CNA2008100898508A CN200810089850A CN101252526A CN 101252526 A CN101252526 A CN 101252526A CN A2008100898508 A CNA2008100898508 A CN A2008100898508A CN 200810089850 A CN200810089850 A CN 200810089850A CN 101252526 A CN101252526 A CN 101252526A
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Abstract
The invention discloses a flow control method used for accessing the VPWS network. The VPWS network includes a first PE and a second PE; the first PE forwards data to the second PE; the method includes that the first PE receives the interface parameter type length value information from the second PE; the interface parameter type length value information carries the interface bandwidth value of accessing side of the second PE; the interface bandwidth value of the accessing side of the first PE is compared with the interface bandwidth value of the accessing side of the second PE; if the interface bandwidth value of the accessing side of the first PE is larger that the interface bandwidth value of the accessing side of the second PE; the interface bandwidth of the accessing side of the first PE is reduced to be not more than the interface bandwidth of the accessing side of the second PE. The invention also proposes a VPWS network system. Based on the flow control method used for accessing the VPWS network, the forwarding efficiency of the flow is improved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of flow control methods and a kind of VPWS network system that is used to insert VPWS (Virtual Private Wire Service, virtual private circuit business) network.
Background technology
The VPWS network is based upon MPLS (Multi-Protocol Label Switching, the multi protocol label exchange) on the basis of network, two layers of transparent transmission of high speed of a pair of port between two routers are provided, it is a kind of L2VPN (Level 2 Virtual Private Network, Layer 2 virtual private network) technology.
The chief component of VPWS network comprises: PE (Provider Edge, provider edge equipment) router, P (Provider, operator's equipment), LDP (Label DistributionProtocol, tag distribution protocol) and LSP Tunnel (Label Switch Path Tunnel, label switched tunnel).
Pe router is safeguarded the link information with its two layers of transparent transmissions that directly link to each other, the P router label forwarding that only takes charge of.Pe router is responsible for VPN client's general data bag is marked and remove mark, by the VC (Virtual Circuit, virtual circuit) between the PE packet is sent to the opposite end then, so pe router must be the edge labelling switch router.
VPWS has made full use of IP/MPLS (Internetworking Protocol/Multi-Protocol Label Switching, Internet protocol/multi protocol label exchange) Internet resources are supported data service, use the IP/MPLS network as Layer 2 data link bag (as ATM (Asynchronous Transfer Mode, asynchronous transfer mode) cell, FR (FrameRelay, frame relay) frame, ethernet frame etc.) the transmission passage is provided, realized the fusion of IP network and data network.And when data forwarding, do not need to search three layers of routing table, accelerated forwarding speed greatly.
Except above advantage, also there are some problems in the VPWS technology.For example: local access side interface is an Ethernet interface, bandwidth 100M, it is the E1 interface that side is inserted in the opposite end, bandwidth has only 2M, like this when transmitting data, if the local ethernet interface at full speed rate receive flow, caused 98% flow to be dropped in the opposite end, and local device can't this situation of perception, also continues to transmit like this, and the loss situation of flow can't be controlled.This situation is especially obvious in the Linktype isomery of two ends.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art: in the flow repeating process, if local end PE equipment inserts the bandwidth of side interface greater than opposite end PE equipment at the flow that inserts the side interface reception, will inevitably be dropped by some flow, and local device can't this situation of perception, also continue to transmit, losing of flow can't be controlled.
Summary of the invention
The present invention aims to provide a kind of flow control methods and a kind of VPWS network system, to solve the PE device bandwidth packet loss problem that causes that causes not of uniform size at virtual circuit two ends.
In an embodiment of the present invention, a kind of flow control methods that is used to insert the VPWS network is provided, this VPWS network comprises a PE and the 2nd PE, the one PE transmits data to the 2nd PE, this method comprises: a PE receives the interface parameters type lengths values information from the 2nd PE, carries the value of the access side interface bandwidth of the 2nd PE in the interface parameters type lengths values information; The one PE compares the value of the access side interface bandwidth of the value of the access side interface bandwidth of this machine and the 2nd PE; If the value of the access side interface bandwidth of a PE is greater than the value of the access side interface bandwidth of the 2nd PE, then the access side interface bandwidth with a PE is reduced to the access side interface bandwidth that is not more than the 2nd PE.
Preferably, the value of carrying the access side interface bandwidth of the 2nd PE in the interface parameters type lengths values information specifically comprises: the value of the access side interface bandwidth of the 2nd PE is filled into last n byte of the interface description field in the interface parameters type lengths values information, and n is a natural number.
Preferably, PE reception specifically comprises from the interface parameters type lengths values information of the 2nd PE: the interface parameters type lengths values information that the 2nd PE will carry the value of this machine access side interface bandwidth sends to a PE; The one PE parses the value of the 2nd PE access side interface bandwidth in the interface parameters type lengths values information.
Preferably, if the value of the access side interface bandwidth of a PE is less than or equal to the value of the access side interface bandwidth of the 2nd PE, then keep the access side interface bandwidth of a PE constant.
In an embodiment of the present invention, a kind of VPWS network system also is provided, comprise: a PE and the 2nd PE, the one PE transmits data to the 2nd PE, wherein, the 2nd PE is used for the interface parameters type lengths values information of this machine is sent to a PE, carries the value of the access side interface bandwidth of the 2nd PE in the interface parameters type lengths values information; The one PE, be used for the value of the access side interface bandwidth of the value of the access side interface bandwidth of this machine and the 2nd PE is compared: if the value of the access side interface bandwidth of a PE greater than the value of the access side interface bandwidth of the 2nd PE, then the access side interface bandwidth with a PE is reduced to the access side interface bandwidth that is not more than the 2nd PE; And if the value of the access side interface bandwidth of a PE is less than or equal to the value of the access side interface bandwidth of the 2nd PE, then keep the access side interface bandwidth of a PE constant.
Wherein, the 2nd PE specifically comprises: filler cells, be used for the value of the access side interface bandwidth of this machine is filled into last n byte of the interface description field of interface parameters type lengths values information, and n is a natural number; Transmitting element, the interface parameters type lengths values information of value that is used for carrying the access side interface bandwidth of the 2nd PE sends to a PE.
And a PE specifically comprises: receiving element is used to receive the interface parameters type lengths values information from the value of the access side interface bandwidth of carrying the 2nd PE of the 2nd PE; Comparing unit is used for the value of the access side interface bandwidth of the value of the access side interface bandwidth of this machine and the 2nd PE is compared; Limiting unit is used for when the value of the access side interface bandwidth of the PE value greater than the access side interface bandwidth of the 2nd PE, and then the access side interface bandwidth with a PE is reduced to the access side interface bandwidth that is not more than the 2nd PE.
Preferably, a PE also comprises: resolution unit is used for parsing the value of access side interface bandwidth of the 2nd PE of interface parameters type lengths values information.
By adopting the flow control methods and the VPWS network system of the embodiment of the invention, the bandwidth information that PE equipment is consulted before transmitting according to flow is adjusted local bandwidth, the PE device bandwidth is not of uniform size to cause the traffic loss problem that causes so overcome, and then has improved forwarding of flow efficient.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 shows the flow control methods that is used to insert the VPWS network according to the embodiment of the invention;
Fig. 2 shows the VPWS schematic network structure according to the embodiment of the invention;
Fig. 3 shows the flow control methods that is used to insert the VPWS network according to the preferred embodiment of the invention;
Fig. 4 shows the VPWS network system block diagram according to the embodiment of the invention.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
The embodiment of the invention has proposed a kind of flow control methods that is used to insert the VPWS network, and this VPWS network comprises a PE and the 2nd PE, and a PE transmits data to the 2nd PE, and as shown in Figure 1, this method may further comprise the steps:
Step S102, a PE receives the interface parameters type lengths values information from the 2nd PE, carries the value of the access side interface bandwidth of the 2nd PE in the interface parameters type lengths values information;
Step S104, a PE compares the value of the access side interface bandwidth of the value of the access side interface bandwidth of this machine and the 2nd PE;
Step S106, if the value of the access side interface bandwidth of a PE greater than the value of the access side interface bandwidth of the 2nd PE, then the access side interface bandwidth with a PE is reduced to the access side interface bandwidth that is not more than the 2nd PE.
By this embodiment, opposite equip. increases the description field that inserts the side interface bandwidth in interface parameters type lengths values information, makes local terminal equipment receive flow according to the bandwidth of opposite equip., has avoided traffic loss.
In step S102, the value of carrying the access side interface bandwidth of the 2nd PE in the interface parameters type lengths values information specifically comprises: the value of the access side interface bandwidth of the 2nd PE is filled into last n byte of the interface description field in the interface parameters type lengths values information, and n is a natural number.
In step S102, the interface parameters type lengths values information that a PE receives from the 2nd PE specifically comprises: the interface parameters type lengths values information that the 2nd PE will carry the value of this machine access side interface bandwidth sends to a PE; The one PE parses the value of the 2nd PE access side interface bandwidth in the interface parameters type lengths values information.
Preferably, if the value of the access side interface bandwidth of a PE is less than or equal to the value of the access side interface bandwidth of the 2nd PE, then keep the access side interface bandwidth of a PE constant.
Fig. 2 shows the VPWS schematic network structure according to the embodiment of the invention.As shown in the figure, PE1 and PE2 are that the packet of receiving adds or peeling label.PE1 and PE2 are with a kind of equipment, or enable the identical equipment of function.PE1 is connected with terminal 1 by inserting side interface A; At the other end, PE2 is connected with terminal 2 by inserting side interface B, and terminal 1 and terminal 2 are in the same network segment, can pass through the VPWS mutual communication.
RFC (Request For Comments, Request for Comment) agreement is a series of important written historical materials about Internet that International Standards Organization (IETF) works out.Regulation according to RFC3036 and RFC 4447, TLV in the VPWS negotiations process with mapping (LDP agreement mapping message, finish parameter negotiation) message is sent to opposite equip. together, a mapping message can be carried a plurality of TLV simultaneously, comprise must carry and optionally.The structure of Interface Parameters (interface parameters) TLV is as shown in table 1.
Table 1
As shown in table 1, since 33bit, promptly the Sub-TLV the type field begins, and its content belongs to Sub-TLV, comprises Interface MTU Sub-TLV and InterfaceParameters Sub-TLV.The embodiment of the invention proposes Interface ParametersSub-TLV is improved, and wherein Variable Length Value has comprised the interface description field that has defined.The length of interface description field is variable, and scope to 80 bytes, has been used to write down the interface message of local binding VPWS example from 0 byte.This field belongs to Optional Field.
In the interface description field, increase " interface bandwidth description field ", be used for writing down the interface bandwidth of binding VPWS example, promptly insert the side interface bandwidth.Comprise information such as interface name at present in the interface description field,, the interface bandwidth description field can be arranged on last n byte in the interface description field for not influencing the negotiations process of VPWS network.Before (80-n) individual byte still as the interface message description field, be used for other contents such as record interface title.
The interface bandwidth of binding VPWS example may be bigger, and as the 10G interface, being converted into binary system can be long.For later expansion, can not distribute very little in addition.Can distribute 10 bytes for the interface bandwidth description field.For example, the local actual bandwidth that inserts side interface is 1000M, and so, the value that writes down in the interface bandwidth description field is exactly 1000*1024*1024 (bit), is converted into partially filled 0 of less than 10 bytes in front behind the binary system.
Fig. 3 shows the flow control methods flow chart that is used to insert the VPWS network according to the preferred embodiment of the invention.Describe in conjunction with Fig. 2, PE1 is an announcement apparatus, and PE2 is a receiving equipment, and as shown in Figure 3, this method may further comprise the steps:
Step S302, PE1 is tied to the VPWS example on the interface A of connecting terminal 1.
Step S304 extracts the value of the bandwidth of A interface, reports the control aspect of PE1.
Step S306 after the control aspect is received the bandwidth value of A interface, is converted into 2 systems, writes then in 10 corresponding in Interface Parameters Sub-TLV bytes.
The mapping message that step S308, PE1 will carry A interface bandwidth information sends to opposite end PE2 equipment, and VPWS connects foundation.
Need explanation, the embodiment of the invention is made amendment to the optional parameters among the TLV, can itself not exert an influence to the VPWS negotiation, and the influence that also can not be subjected to Interface Parameters Sub-TLV is set up in the connection of VPWS.
Step S310 is to step S312, extract among the TLV of PE2 from mapping message after the bandwidth value of A interface and the local bandwidth ratio that inserts side interface B, if the bandwidth of A interface is more than or equal to the B interface bandwidth, then not as any processing, even because B interface at full speed the rate converting flow also can not make the A interface produce congested, flow process finishes;
If the A interface bandwidth less than the B interface bandwidth, then needs the bandwidth of B interface to be limited execution in step S312.
Step S314 is to step S316, and to identical with the A interface, the value after will limit then is issued to the forwarding plane record to PE2 with the bandwidth constraints of B interface, and the flow that B interface receives in follow-up forwarding can not surpass this numerical value, the flow process end.
According to above method, the bandwidth constraints with the A interface arrives identical with B interface equally.Like this, the flow of transmitting mutually between PE1 and PE2 has just been avoided losing, and has saved the bandwidth of virtual circuit between PE1 and the PE2.
As shown in Figure 4, embodiments of the invention have also proposed a kind of VPWS network system, comprise that a PE 10 and the 2nd PE 20, the one PE 10 transmit data to the 2nd PE 20, wherein:
The 2nd PE 20 is used for the interface parameters type lengths values information of this machine is sent to a PE, carries the value of the access side interface bandwidth of the 2nd PE in the interface parameters type lengths values information;
The one PE 10, be used for the value of the access side interface bandwidth of the value of the access side interface bandwidth of this machine and the 2nd PE is compared: if the value of the access side interface bandwidth of a PE greater than the value of the access side interface bandwidth of the 2nd PE, then the access side interface bandwidth with a PE is reduced to the access side interface bandwidth that is not more than the 2nd PE; And if the value of the access side interface bandwidth of a PE is less than or equal to the value of the access side interface bandwidth of the 2nd PE, then keep the access side interface bandwidth of a PE constant.
Wherein, the 2nd PE 20 specifically comprises: filler cells 202, be used for the value of the access side interface bandwidth of this machine is filled into last n byte of the interface description field of interface parameters type lengths values information, and n is a natural number; Transmitting element 204, the interface parameters type lengths values information of value that is used for carrying the access side interface bandwidth of the 2nd PE sends to a PE.
And a PE 10 specifically comprises: receiving element 102 is used to receive the interface parameters type lengths values information from the value of the access side interface bandwidth of carrying the 2nd PE of the 2nd PE; Comparing unit 104 is used for the value of the access side interface bandwidth of the value of the access side interface bandwidth of this machine and the 2nd PE is compared; Limiting unit 106 is used for when the value of the access side interface bandwidth of the PE value greater than the access side interface bandwidth of the 2nd PE, and then the access side interface bandwidth with a PE is reduced to the access side interface bandwidth that is not more than the 2nd PE.
Preferably, a PE also comprises: resolution unit is used for parsing the value of access side interface bandwidth of the 2nd PE of interface parameters type lengths values information.
The preferred embodiment has provided the preferred structure of system of the present invention.
As can be seen from the above description, the present invention has realized following technique effect:
1. the flow that can not transmit for opposite end PE equipment limits on the local device incoming interface in advance, has avoided traffic loss.
2. save the bandwidth of virtual circuit, improved the flow forward efficiency.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.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. flow control methods that is used to insert the VPWS network, described VPWS network comprises a PE and the 2nd PE, a described PE transmits data to described the 2nd PE, it is characterized in that, said method comprising the steps of:
A described PE receives the interface parameters type lengths values information from described the 2nd PE, carries the value of the access side interface bandwidth of described the 2nd PE in the described interface parameters type lengths values information;
A described PE compares the value of the access side interface bandwidth of the value of the access side interface bandwidth of this machine and described the 2nd PE;
If the value of the access side interface bandwidth of a described PE is greater than the value of the access side interface bandwidth of described the 2nd PE, then the access side interface bandwidth with a described PE is reduced to the access side interface bandwidth that is not more than described the 2nd PE.
2. method according to claim 1 is characterized in that, the value of carrying the access side interface bandwidth of described the 2nd PE in the described interface parameters type lengths values information specifically comprises:
The value of the access side interface bandwidth of described the 2nd PE is filled into last n byte of the interface description field in the described interface parameters type lengths values information, and n is a natural number.
3. method according to claim 2 is characterized in that, the interface parameters type lengths values information that a described PE receives from described the 2nd PE specifically comprises:
The described interface parameters type lengths values information that described the 2nd PE will carry the value of this machine access side interface bandwidth sends to a described PE;
A described PE parses the value of described the 2nd PE access side interface bandwidth in the described interface parameters type lengths values information.
4. method according to claim 1 is characterized in that, also comprises:
If the value of the access side interface bandwidth of a described PE is less than or equal to the value of the access side interface bandwidth of described the 2nd PE, then keep the access side interface bandwidth of a described PE constant.
5. a VPWS network system comprises a PE and the 2nd PE, and a described PE transmits data to described the 2nd PE, it is characterized in that, comprising:
Described the 2nd PE is used for the interface parameters type lengths values information of this machine is sent to a described PE, carries the value of the access side interface bandwidth of described the 2nd PE in the described interface parameters type lengths values information;
A described PE is used for the value of the access side interface bandwidth of the value of the access side interface bandwidth of this machine and described the 2nd PE is compared:
If the value of the access side interface bandwidth of a described PE is greater than the value of the access side interface bandwidth of described the 2nd PE, then the access side interface bandwidth with a described PE is reduced to the access side interface bandwidth that is not more than described the 2nd PE; And
If the value of the access side interface bandwidth of a described PE is less than or equal to the value of the access side interface bandwidth of described the 2nd PE, then keep the access side interface bandwidth of a described PE constant.
6. VPWS network system according to claim 5 is characterized in that, described the 2nd PE specifically comprises:
Filler cells is used for the value of the access side interface bandwidth of this machine is filled into last n byte of the interface description field of described interface parameters type lengths values information, and n is a natural number;
Transmitting element, the described interface parameters type lengths values information of value that is used for carrying the access side interface bandwidth of described the 2nd PE sends to a described PE.
7. VPWS network system according to claim 6 is characterized in that, a described PE specifically comprises:
Receiving element is used to receive the interface parameters type lengths values information from the value of the access side interface bandwidth of described the 2nd PE of carrying of described the 2nd PE;
Comparing unit is used for the value of the access side interface bandwidth of the value of the access side interface bandwidth of this machine and described the 2nd PE is compared;
Limiting unit is used for when the value of the access side interface bandwidth of the described PE value greater than the access side interface bandwidth of described the 2nd PE, and then the access side interface bandwidth with a described PE is reduced to the access side interface bandwidth that is not more than described the 2nd PE.
8. VPWS network system according to claim 7 is characterized in that, a described PE also comprises:
Resolution unit is used for parsing the value of access side interface bandwidth of described the 2nd PE of described interface parameters type lengths values information.
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| CN2008100898508A CN101252526B (en) | 2008-04-03 | 2008-04-03 | Flow control method as well as VPWS network system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035722A (en) * | 2009-09-28 | 2011-04-27 | 中兴通讯股份有限公司 | Flow control method and device |
| CN102739505A (en) * | 2011-04-06 | 2012-10-17 | 中兴通讯股份有限公司 | Method and system for controlling virtual channel flow in data center network |
| WO2014032494A1 (en) * | 2012-08-28 | 2014-03-06 | Hangzhou H3C Technologies Co., Ltd. | Discovering a peer provider edge (pe) of a virtual private lan service (vpls) instance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100426737C (en) * | 2005-07-22 | 2008-10-15 | 上海华为技术有限公司 | Iub interface flow control plan |
| CN1984041B (en) * | 2006-05-20 | 2010-12-15 | 华为技术有限公司 | Method and UTRAN system for controlling HSDPA service down-link speed ratio |
| CN100527710C (en) * | 2006-06-15 | 2009-08-12 | 华为技术有限公司 | Method and device for controlling data flow |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035722A (en) * | 2009-09-28 | 2011-04-27 | 中兴通讯股份有限公司 | Flow control method and device |
| CN102035722B (en) * | 2009-09-28 | 2014-03-19 | 中兴通讯股份有限公司 | Flow control method and device |
| CN102739505A (en) * | 2011-04-06 | 2012-10-17 | 中兴通讯股份有限公司 | Method and system for controlling virtual channel flow in data center network |
| CN102739505B (en) * | 2011-04-06 | 2017-02-08 | 中兴通讯股份有限公司 | Method and system for controlling virtual channel flow in data center network |
| WO2014032494A1 (en) * | 2012-08-28 | 2014-03-06 | Hangzhou H3C Technologies Co., Ltd. | Discovering a peer provider edge (pe) of a virtual private lan service (vpls) instance |
| CN103634210A (en) * | 2012-08-28 | 2014-03-12 | 杭州华三通信技术有限公司 | Method and apparatus for discovering opposite-end provider edge (PE) device of virtual private LAN service (VPLS) instance |
| CN103634210B (en) * | 2012-08-28 | 2016-10-19 | 杭州华三通信技术有限公司 | Find the method and apparatus of the opposite end PE equipment of VPLS example |
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