CN100559755C - Automatically find the method and system of virtual network - Google Patents
Automatically find the method and system of virtual network Download PDFInfo
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- CN100559755C CN100559755C CNB2004800315311A CN200480031531A CN100559755C CN 100559755 C CN100559755 C CN 100559755C CN B2004800315311 A CNB2004800315311 A CN B2004800315311A CN 200480031531 A CN200480031531 A CN 200480031531A CN 100559755 C CN100559755 C CN 100559755C
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Abstract
The present invention is convenient to find automatically the VPN relevant information, and this relates to existence or association as the VPN that is supported by provider's edge device in the core network.Particularly, use Border Gateway Protocol (BGP) to be convenient to automatic discovery, and provider's edge device can trigger tag distribution protocol (LDP) process subsequently automatically so that the interior signaling based on the LDP session of core network.
Description
The application requires the rights and interests of the U.S. Provisional Application 60/515600 of submission on October 30th, 2003, its open this paper that all is incorporated into by reference thus.
Invention field
The present invention relates to communication and the ability and the relative information that relate to the unit of automatic discovery virtual support dedicated network particularly.
Background of invention
Along with the appearance of internet and other common networks, Local Area Network can be communicated by letter with other LAN on these common networks, to support to relate to the communication of data, voice, audio or video.In order to make great efforts that the complexity of the devices communicating on the equipment on the LAN and another LAN is minimized, the switching technology that adopts by simulation LAN is supported the communication between the LAN usually.In other words, the connection that will support on common network is configured to simulate the direct connection to LAN.The connection of these simulations is commonly referred to as VPN (virtual private network) (VPN), and can support other fail safes of various level, with the user that guarantees only to authorize can accesses network and the data transmitted can not be intercepted and captured.
Connect the common network that LAN passed through and to have the many router and switching equipment that must be configured to support VPN.Along with network development and VPN quantity growth, be exponential increase with the difficulty of supporting VPN to be associated with appropriate renewal network element.At this moment, the configuration of network element and supply (provisioning) major part is manually carried out, and wherein the utility command line interface is individually supplied network element with the variation in the enforcement network or the VPN of network support.Thus, need a kind of effective and automatic mode to upgrade and dispose network element supporting increase and the expansion of VPN, and the network enabled growth.
Summary of the invention
The present invention is convenient to find automatically VPN information, and this relates to existence or association as the VPN that is supported by provider's edge device in the core network.Particularly, use Border Gateway Protocol (BGP) to be convenient to find automatically subsequently, and provider's edge device can trigger tag distribution protocol (LDP) process automatically so that the interior signaling based on the LDP session of core network.VPN information can be corresponding to the establishment at the virtual switch interface (VSI) of long-range provider edge device, and will comprise the sign of corresponding VPN and receive provider's edge device directly or through the route reflector with LDP with the required information of signaling therebetween.BGP can also be used to make the provider's edge device in the core network can consult ability.
Therefore, the existence that BGP is used for finding VPN on the core network automatically is with related, and wherein the LDP process can be triggered when finishing or can manually supply between each the equity side in whole mesh as required automatically finding automatically.The present invention reduces the amount of manually importing VPN information on the whole grid that forms for VPN in the core network greatly.
After having read following DETAILED DESCRIPTION OF THE PREFERRED in conjunction with the accompanying drawings, it will be appreciated by those skilled in the art that scope of the present invention, and recognize its additional aspect.
Brief description
Be incorporated in this specification and constitute its part attached some aspects of the present invention are shown out, and and specification one be used from and explain principle of the present invention.
Fig. 1 is the block representation of communication environment according to an embodiment of the invention.
Fig. 2 is a block representation of supporting many virtual switch instance of corresponding VPN according to an embodiment of the invention.
Fig. 3 A and 3B are the communication flow diagram that the operation of one embodiment of the invention is shown.
Fig. 4 is the block representation of provider's edge device according to an embodiment of the invention.
DETAILED DESCRIPTION OF THE PREFERRED
These embodiment descriptions of below setting forth make those skilled in the art can put into practice necessary information of the present invention and best mode of the present invention is put into practice in explanation.When below the foundation accompanying drawing is read, illustrating, the application that it will be appreciated by those skilled in the art that notion of the present invention and will recognize these notions that specifically do not propose at this paper.Should be appreciated that these notions and application drop in the scope of the disclosure and the accompanying claims.
The invention provides a kind of technology is used to make the network equipment can automatically be configured to foundation, expansion and the deletion of virtual support dedicated network (VPN) voluntarily.According to communication environment shown in Figure 1 10, core network 12 is supported the communication of label exchange.At the edge of core network 12, provider's edge device (PE) 16 is convenient to realize the interface to any amount of other network entities or network by customer edge (CE) 14.The communication of label exchange is provided between provider's edge device 16 via many providers network equipments (PN) 18 in one embodiment.In operation, provide interface between the communication of the label exchange that in core network 12, provides of provider's edge device 16 and the another kind of communication technology as ethernet technology by customer edge 14 supports.
In one embodiment, provider's edge device 16 and 18 cooperations of provider's network equipment allow virtual special local area network (LAN) exchange (VPLS) network, and it can support the vpn service between the various customer edge 14.For each VPN that supports by core network 12, in provider's edge device 16, implement corresponding virtual Fabric Interface (VSI), so that VSI has the interface that is used to support via the label exchange of the communication of core network 12, and have and be used to be convenient to the another kind of interface of communicating by letter with customer edge 14, as Ethernet interface.
With reference to figure 2, the part of communication environment 10 is shown, two provider's edge devices 16 (A and B) are wherein arranged, respectively have the VSI that three supports are used for three different VPN (A, B and C) of respective user edge device 14.In this configuration, will manage corresponding VSI via tag distribution protocol (LDP) session that is used for vpn service (A, B and C).
In one embodiment, core network 12 provides the multiprotocol label switching (mpls) architecture, wherein provider's edge device 16 can be tag edge router (LER), and the provider's network equipment 18 in the core network 12 can be LSR (LSR).In the MPLS architecture, label is appended to the packet that is sent to another edge from an edge of network.When grouping entered the MPLS architecture, LER checked destination and any other packet attributes of grouping, and is this packet allocation label.LER is assigned to corresponding label switched path (LSP) 19 by appending label with this packet then, and sends it to first LSR among the LSP 19 of distribution.Each LSR along LSP 19 will transmit packet along LSP19 based on top-level tab, till this grouping arrives purpose LER, purpose LER will remove top-level tab then, and based on the inner label form this grouping will be routed to appropriate users edge device 14 or other suitable end points.
When grouping when LSP 19 transmits, LSR can be surveillance tag and transmit grouping and unaltered label, or can replace this label with new label and be convenient to along LSP 19 Route Selection or exchange.Based on these labels, each LSR will have routing table.Therefore, LSP19 extends between LER, and it is identified by label.When business entered or leave the MPLS architecture, LER distributed, adds and remove label.The MPLS architecture allows to set up LSP 19 to support the many communication sessions between the customer edge 14.Those skilled in the art will be familiar with setting up the notion of LSP 19 in the MPLS architecture, and will particularly be familiar with using LDP to assist this process.
For supporting VPN, each VPN will be associated with the VSI that sets up at each the provider's edge device 16 that participates in VPN.Between each of these provider's edge devices 16, must form LSP 19 or be used between these two provider's edge devices 16, providing the mechanism of tunneling technique (tunneling), and can connect along these VPN session takes place.It should be noted that a plurality of VPN advertisements can take place in any one LDP session.As long as create the VPN that comprises customer edge 14, just must suitably dispose and support provider's edge device 16 any time.Configuration is included in creates corresponding VSI in each the provider's edge device 16 that participates in VPN, and must make each provider's edge device 16 know the every other provider edge device 16 that participates in VPN.For example, each provider's edge device 16 needs to identify the business that is associated with VPN and for the VPN that is associated where business is sent in core network 12.Those skilled in the art will recognize that how to use LDP to set up session between provider's edge device 16.The present invention relates to be equipped with suitable information for each provider's edge device 16, allowing using LDP to set up various sessions, and need not with VPN or be used to support all necessary information manual configuration provider edge devices 16 that the VSI of VPN is associated as VPN in automatic mode.
The present invention uses Border Gateway Protocol (BGP) will exist and be used to support any necessary information of VPN to be sent to affected provider edge device 16 with automated manner.Therefore, when creating or expand VPN, the present invention uses BGP to set up the required information of LDP session and be distributed to relevant provider edge device 16 automatically being used for LDP.Except that being considered to be other desired information, this information also will generally comprise the identifier of the VPN that can be associated with suitable VSI and be used for along the required any next hop information of LSP 19 Route Selection grouping that is associated with VPN.Moreover, various providers edge device 16 can before this layoutprocedure or during consult their corresponding abilities.Each provider's edge device 16 will be configured to trigger automatically the LDP operation receive suitable VPN information through bgp session after.When reducing from system or removing VPN, the present invention still is applicable.
The communication stream of Fig. 3 A and 3B illustrates an embodiment, and wherein BGP is used for ability and the information about firms of automated manner discovery by the VPN of core network 12 supports, and initiates LDP session or other LDP processes automatically based on this discovery.In this embodiment, suppose each its ability of provider's edge device 16 initial negotiation, how to communicate by letter with other provider's edge devices 16 best so that each provider's edge device 16 is known.Ability that it should be noted that various providers edge device 16 and provider's network equipment 18 may change, and therefore corresponding therebetween session will change.At first, suppose that the edge device 16B of provider, 16C and 16D have known each other and their corresponding abilities.As the new edge device 16A of provider and edge device 16 (B, C and the D) of provider when being associated, " open " message from the edge device 16A of provider to each transmission of provider's edge device 16 (B, C and D), with the negotiation (step 100,102 and 104) of initiating their corresponding abilities.Each of provider's edge device 16 (B, C and D) will suitably respond (step 106,108 and 110).This negotiation may need to travel to and fro between a plurality of communications between the various device, with the ability of each provider's edge device 16 of abundant negotiation.When consulting to finish, each provider's edge device 16 will be known the ability of other provider's edge devices 16 and know and how to communicate by letter with them best.These consult to use BGP to take place, and the message that is used to consult these abilities can directly send or send to Router Reflector between provider's edge device 16, Router Reflector will be convenient to the communication between provider's edge device 16, as understanding in the art.
In case consulted ability, supposed and on the edge device 16A of provider, create VSI to support to have the VPN (step 112) of ID=A.VSI also will make up the required information of the LDP session that is used for signaling with other provider's edge devices 16 and be designated as this signaling Route Selection information where of will dividing into groups and be associated.Information can comprise next hop address, and is commonly referred to as route target, can use as the Internet Protocol (IP) of certain version of edition 4 and 5 to come its coding.When having created VSI for VPN, the edge device 16A of provider sends to all provider's edge devices 16 (B, C and D) that the edge device 16A of provider knows with the VSI notice, or sends to the edge device 16B of provider that selects of this VPN of known support (or VSI).In the embodiment shown in this, whether do not support to use BGP the VSI notice to be sent to provider's edge device 16 (B, C and D) each (step 114,116 and 118) under the situation of the VPN that is associated with the new VSI that creates knowing these provider's edge devices 16 (B, C and D).When receiving the VSI notice, each of provider's edge device 16 (B, C and D) will be analyzed internal database to determine whether it has the coupling VSI (step 120,122 and 124) of corresponding VPN.In this case, do not mate, because there is not provider's edge device 16 (B, C and D) to have the VSI that is associated with VPN ID=A.
Next, suppose that the edge device 16B of provider is that the VPN with ID=A creates VSI, it with the edge device 16A of provider in the VSI identical (step 126) that creates.At this point, the edge device 16B of provider will use BGP to send VSI notice (step 128,130 and 132) to the edge device 16A of provider, 16C and 16D.The edge device 16A of provider will analyze this VSI notice, and recognize VSI that creates on the edge device 16B of provider and the VSI identical (step 134) that had before created based on VPN ID (VPN ID=A).Thus, provider's edge device 16A will trigger the LDP operation.Simultaneously, edge device 16C of provider and 16D will analyze this VSI notice, and recognize for the VSI that creates at the edge device 16B of provider there is not coupling (step 136 and 138).
Refer again to the edge device 16A of provider, at first judge, check the LDP session of whether having created with the edge device 16B of provider (unshowned step).Suppose and do not create the LDP session as yet that the edge device 16A of provider will send message to create LDP session (step 140) to the edge device 16B of provider, will confirm its (step 142) by the edge device 16B of provider then.It should be noted that each provider's edge device 16 will comprise state machine, it will recognize the automatic discovery conversation end that uses BGP, and will trigger the LDP process.If the LDP session does not exist, this LDP process may need to set up the LDP session to be used, and perhaps needs to select existing LDP session to use in tag match and during other LDP handles.
At this point, between edge device 16A of provider and 16B, set up LDP session (step 144), wherein be convenient to realize being convenient in the edge device 16A of provider that uses the VSI that is associated with VPN ID=A and the signaling of the packet communication between the 16B.When creating the LDP session, the edge device 16B of provider will send tag mapping information (step 146) to the edge device 16A of provider, and provider's edge device 16A will provide tag mapping information (step 148) to the edge device 16B of provider then.Tag mapping information will provide label to use when during the communication session that relates to VPN (VPN ID=A) grouping being routed to corresponding provider edge device 16 effectively.Use LDP that label mapping message is provided in the augmented pattern mode.It should be noted that with automated manner provides triggering according to the LDP session of VSI notice, so that from using the automatic transition of the discovery procedure that BGP provides.
At this point, suppose that the edge device 16C of provider creates VSI (step 150) for VPN ID=A, the customer edge 14 that is associated with the edge device 16C of provider with indication is adding this VPN.Thus, provider's edge device 16C will use the VSI of the establishment of BGP transmission indication VSI to notify the edge device 16A of provider, 16B and 16D (step 152,154 and 156).The edge device 16A of provider will analyze this VSI notice, and recognize VSI that creates at the edge device 16C of provider and the VSI that has created coupling, thus and triggering LDP process (step 158).Suppose the LDP session that is used to support the LDP process Already between provider's edge device 16A and the 16C, and be present between edge device 16B of provider and the 16C.According to the LDP process, then label mapping message is provided to the edge device 16C of provider (step 160), the edge device 16C of provider will respond by using LDP to send it back label mapping message (step 162) to the edge device 16A of provider.Therefore, provider's edge device 16A and 16C have the corresponding label information that is used for sending betwixt grouping.
Similarly, the edge device 16B of provider will recognize that it has VSI corresponding to the VSI that creates at the edge device 16C of provider, and will trigger LDP process (step 164).Edge device 16B of provider and 16C will send corresponding label mapping message toward ground return then, with the corresponding label (step 166 and 168) that is provided for communicating by letter between edge device 16B of provider and the 16C.The edge device 16D of provider will analyze this VSI notice, and recognize there is not VSI coupling (step 170).At this point, the LDP session is present between the edge device 16A of provider, 16B and the 16C, and the call signaling that is used for the communication of the label exchange grid that can use the virtual connection that spreads all over core network 12 takes place in the mode of augmented pattern.
Therefore, automatic discovery technique of the present invention uses BGP to come to be provided for tracking network topology, their corresponding abilities and to make all necessary informations of the existence of the VPN that the LDP session can set up or the VSI that is associated to various providers edge device 16 and provider's network equipment 18, by bgp session being used for the network change that automatic discovery is associated with VPN and their VSI of support, and trigger the LDP process automatically, then need not the affected provider of manual configuration edge device 16 and provider's network equipment 18.For BGP is convenient to realize the present invention, additional Address-Family Identifier symbol (AFI) and subsequently Address-Family Identifier symbol (SAFI) will be defined as to indicate and be present in the BGP message with the establishment of VSI, information or other VPLS information that their corresponding VPN are relevant.
Forward Fig. 4 now to, the provider's edge device 16 that may be embodied as tag edge router according to one embodiment of the invention is shown.Provider's edge device 16 will comprise the control system 20 with memory 22, and this memory 22 has sufficient software 24 so that above-mentioned functions to be provided.Control system 20 will be cooperated with one or more core network interface 26 and local network interface 28, with the communication that allows the communication on core network 12 respectively and arrive customer edge 14.
Those skilled in the art will recognize that improvement and modification to the preferred embodiment of the present invention.All this improvement and modification all are considered as in the scope of notion disclosed herein and following claim.
Claims (25)
1. one kind is used for being convenient to the automatic method of finding VPN (virtual private network) VPN information between provider's edge device of core network, comprising:
A) use Border Gateway Protocol (BGP) to receive and relate to the first information of supplying VPN;
Described method is characterised in that also and comprises:
B) response receives the described first information, uses tag distribution protocol LDP to initiate the LDP process automatically.
2. the method for claim 1 is characterized in that the described first information relates to the described VPN of establishment on long-range provider edge device.
3. method as claimed in claim 2 is characterized in that the described first information relates to establishment virtual switch interface VSI to support described VPN.
4. method as claimed in claim 3 also is included in and initiates to judge whether the local VSI corresponding to described VSI exists before the described LDP process.
5. method as claimed in claim 4 also comprises and sets up the LDP session so that realize described LDP process.
6. method as claimed in claim 5 also is included in to set up and judges whether not set up described LDP session before the described LDP session.
7. the method for claim 1 is characterized in that the described first information comprises the VPN identifier.
8. method as claimed in claim 7 is characterized in that the described first information comprises the next hop information that is associated with label switched path.
9. method as claimed in claim 7 is characterized in that the described first information comprises route target.
10. the method for claim 1 also comprises described BGP and the long-range provider edge device negotiation communication ability used.
11. the method for claim 1 also comprises:
A) create virtual switch interface VSI to support described VPN; And
B) the VSI notification message is sent at least one provider's edge device.
12. the method for claim 1 is characterized in that described core network support is used for the label exchange of virtual special local area network exchange, and also comprises:
A) be convenient to realize label-switched interface, so that the communication on described core network; And
B) be convenient to realize local network interface so that with the communicating by letter of customer edge.
13. a system that is used for being convenient to find automatically VPN (virtual private network) VPN information between provider's edge device of core network comprises:
A) label-switched interface is suitable for being convenient to the communication on described core network;
B) local network interface is suitable for being convenient to and the communicating by letter of customer edge; And
C) control system that is associated with described label-switched interface and described local network interface, described control system is suitable for:
I) use Border Gateway Protocol (BGP) to receive and relate to the first information of supplying VPN;
Described system is characterised in that described control system also is suitable for:
Ii) response receives the described first information, uses tag distribution protocol LDP automatic
Initiate the LDP process.
14. system as claimed in claim 13 is characterized in that the described first information relates to the described VPN of establishment on long-range provider edge device.
15. system as claimed in claim 14 is characterized in that the described first information relates to establishment virtual switch interface VSI to support described VPN.
16. system as claimed in claim 15 is characterized in that described control system is suitable for also judging whether the local VSI corresponding to described VSI exists before initiating described LDP process.
17. system as claimed in claim 16 is characterized in that described control system also is suitable for setting up the LDP session so that realize described LDP process.
18. system as claimed in claim 17 is characterized in that described control system also is suitable for judging whether not set up described LDP session before setting up described LDP session.
19. system as claimed in claim 13 is characterized in that the described first information comprises the VPN identifier.
20. system as claimed in claim 19 is characterized in that the described first information comprises the next hop information that is associated with label switched path.
21. system as claimed in claim 19 is characterized in that the described first information comprises route target.
22. system as claimed in claim 13 is characterized in that described control system also is suitable for using described BGP and long-range provider edge device negotiation communication ability.
23. system as claimed in claim 13 is characterized in that described control system also is suitable for:
A) create virtual switch interface VSI to support described VPN; And
B) the VSI notification message is sent at least one provider's edge device.
24. system as claimed in claim 13 is characterized in that described core network support is used for the label exchange of the virtual special local area network exchange on described core network.
25. a system that is used for being convenient to find automatically VPN (virtual private network) VPN information between provider's edge device of core network comprises:
A) be used to use Border Gateway Protocol (BGP) to receive the parts that relate to the first information of supplying VPN;
Described system is characterised in that also and comprises:
B) be used to respond and receive the parts that the described first information uses tag distribution protocol LDP to initiate the LDP process automatically.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US51560003P | 2003-10-30 | 2003-10-30 | |
| US60/515,600 | 2003-10-30 | ||
| US10/753,296 | 2004-01-08 |
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| CN1871813A CN1871813A (en) | 2006-11-29 |
| CN100559755C true CN100559755C (en) | 2009-11-11 |
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| CNB2004800315311A Expired - Fee Related CN100559755C (en) | 2003-10-30 | 2004-10-26 | Automatically find the method and system of virtual network |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100466576C (en) * | 2007-04-30 | 2009-03-04 | 深圳市深信服电子科技有限公司 | Method for reducing disposition VPN network through self-organization field |
| CN102045232A (en) * | 2009-10-19 | 2011-05-04 | 中兴通讯股份有限公司 | System and method for acquiring link information in bilayer VPN (Virtual Private Network) |
| CN101997718A (en) * | 2010-10-21 | 2011-03-30 | 中兴通讯股份有限公司 | Fault positioning method and device |
| CN102624601B (en) * | 2011-01-28 | 2014-12-03 | 华为技术有限公司 | Data message transmission method, network device and network system |
| WO2012142771A1 (en) * | 2011-04-22 | 2012-10-26 | 华为技术有限公司 | Method and label switched router (lsr) for initiating label distribution protocol (ldp) session connection establishment |
| CN103580980B (en) * | 2012-07-24 | 2019-05-24 | 中兴通讯股份有限公司 | The method and device thereof that virtual network finds and automatically configures automatically |
-
2004
- 2004-10-26 CN CNB2004800315311A patent/CN100559755C/en not_active Expired - Fee Related
Non-Patent Citations (4)
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| MPLS的核心-LDP. 陈启美，周修毅，王逸.电力自动化设备，第22卷第3期. 2002 |
| MPLS的核心-LDP. 陈启美，周修毅，王逸.电力自动化设备，第22卷第3期. 2002 * |
| Provisioning Models and Endpoint Identifiers inL2VPNSignaling,http://www3.tools.ietf.org/html/draft-ietf-l2vpn-signaling-00. Eric，C.，Rosen，Vasile，Radoaca.. 2003 |
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