CN103209125A - Label information transmission method and device - Google Patents
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- CN103209125A CN103209125A CN2013101177023A CN201310117702A CN103209125A CN 103209125 A CN103209125 A CN 103209125A CN 2013101177023 A CN2013101177023 A CN 2013101177023A CN 201310117702 A CN201310117702 A CN 201310117702A CN 103209125 A CN103209125 A CN 103209125A
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Abstract
The invention discloses a label information transmission method and device. The label information transmission method includes that a first PE (Provider Edge) device receives Import RT (Route Target) attribute information from a second PE device; the first PE device confirms VPN (Virtual Private Network) cases which are corresponding to the Import RT attribute information in all VPN cases; and the first PE device sends label information of the VPN cases which are corresponding to the Import RT attribute information to the second PE device through a BGP (Border Gateway Protocol) Update message. The label information transmission method and system has the advantages of avoiding transmitting unnecessary BGP Update messages and reducing the transmission number of the BGP Update messages.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of transmission method and equipment of label information.
Background technology
MPLS(Multiprotocol Label Switching, multiprotocol label switching) L2VPN(Layer 2Virtual Private Network, Layer 2 virtual private network) between the different user node, setting up two layers of connection; Based on MPLS L2VPN technology, the Layer 2 data of operator's transparent transmission different pieces of information link layer on unified MPLS or IP backbone makes the data link layer service can cross over MPLS or IP backbone transmission.Wherein, MPLS L2VPN comprises VPWS(Virtual Private Wire Service, the service of virtual private exchange line road) and VPLS(Virtual Private LAN Service, the virtual special local area network service).
VPWS is the MPLS L2VPN business of the point-to-point that provides in common network, from the user point of view, MPLS or IP backbone are two layers of switching networks, and user's perception is less than the existence of MPLS or IP backbone, just as directly linking to each other by ethernet link between the node.VPLS is that the point that provides in common network is to the MPLS L2VPN business of multiple spot, its essence is that creating a series of virtual switch is leased to the user, make the user can pass through MAN(Metropolitan Area Network, metropolitan area network) or WAN(Wide Area Network, wide area network) realizes self LAN(Local Area Network, local area network (LAN)).
As shown in Figure 1, the networking schematic diagram for MPLS L2VPN network comprises: CE(Customer Edge, customer network edge) equipment, directly the user network side apparatus that links to each other with service provider network; PE(Provider Edge, the service provider network edge) equipment, the service provider network side apparatus that links to each other with CE equipment; P(Provider, service provider network) equipment does not directly link to each other with CE equipment, the P device just will be along the tunnel with message from an end PE device forwards to other end PE equipment.
In the MPLS of Kompella mode L2VPN technology, introduced the concept of VPN, made to connect between the CE equipment belong to same VPN, belonged between the CE equipment of different VPN and can not connect; Distinguished following concept for this reason: (1) CE ID, by a CE equipment in the CE ID unique identification VPN, CE ID can be identical in the different VPN; (2) RD(Route Distinguisher, Route Distinguisher), in order to distinguish the CE equipment that CE ID is identical in the different VPN, can before CE ID, increase RD, by a CE equipment in the RD+CE ID unique identification network; (3) RT(Route Target, route target), this RT is used for distinguishing different VPN, guarantees to belong between the CE equipment of same VPN to connect, and belongs between the CE equipment of different VPN to connect; (4) label information, PE equipment makes each PE equipment to calculate label according to the label information of other PE devices advertise by self distributed labels information announcement being given all the PE equipment in the same VPN.
In the prior art, PE equipment (as: PE1) can be by BGP(Border Gateway Protocol, Border Gateway Protocol) Update(renewal) message announces the label information of local all VPN instance to opposite end PE equipment (as: PE2), and carries RT attribute (the being Export route target(outlet route target) attribute of VPN instance in this BGP Update message); Opposite end PE equipment after receiving this BGP Update message, the Import route target(import route target of more local VPN instance configuration) the RT attribute that carries in attribute and the BGP Update message; If the two coupling, then PE equipment in opposite end can be accepted the label information that carries in the BGP Update message; If the two does not match, then do not handle this label information.
In above-mentioned implementation, PE equipment need be announced the label information of local all VPN instance to opposite end PE equipment by BGP Update message, thereby can cause the waste of BGP Update message; As shown in Figure 1, last all VPN instance of PE1 are that VPN1(Export route target is 100:1) and VPN2(Export route target be 200:1), the last VPN instance of PE2 is that VPN1(Import route target is 100:1); Based on this, as shown in Figure 2, PE1 need send to PE2 with the label information of VPN1 example and the label information of VPN2 example respectively by two BGP Update messages, and the RT attribute that carries in these two BGP Update messages is respectively 100:1 and 200:1; PE2 is after receiving these two BGP Update messages, by Import route target(100:1 relatively) and BGP Update message in the RT attribute that carries, can accept the RT attribute is the BGP Update message of 100:1, and can abandon the BGP Update message that the RT attribute is 200:1, obviously, the RT attribute is that transfer resource has been wasted in the transmission of the BGP Update message of 200:1.
Summary of the invention
The embodiment of the invention provides a kind of transmission method and equipment of label information, to avoid transmitting unnecessary BGP Update message, has reduced the transmission quantity of BGP Update message.
In order to achieve the above object, the embodiment of the invention provides a kind of transmission method of label information, be applied to comprise that this method may further comprise the steps in the multiprotocol label switching MPLS L2VPN L2VPN network of Border Gateway Protocol (BGP) neighbours' each other the first service provider network edge PE equipment and the 2nd PE equipment:
After a described PE equipment and described the 2nd PE equipment were set up bgp neighbor, a described PE equipment received the Import route target RT attribute information from described the 2nd PE equipment;
A described PE equipment is determined on this PE equipment in all virtual private network examples the VPN instance corresponding to described Import RT attribute information;
A described PE equipment sends to described the 2nd PE equipment by BGP Update message with the label information of described VPN instance corresponding to described Import RT attribute information, and has carried the Export RT attribute of described VPN instance in the described BGP Update message.
Before the Import route target RT attribute information of described PE equipment reception from described the 2nd PE equipment, described method also comprises:
After described the 2nd PE equipment and a described PE equipment are set up bgp neighbor, described the 2nd PE equipment is collected the Import RT attribute information of all VPN instance on this 2nd PE equipment, and by BGP Refresh message the Import RT attribute information of all VPN instance is sent to a described PE equipment.
Described the 2nd PE equipment is collected the Import RT attribute information of all VPN instance on this 2nd PE equipment, and by BGP Refresh message the Import RT attribute information of all VPN instance is sent to a described PE equipment, specifically comprises:
Described the 2nd PE equipment is when the BGP Open message of receiving from a described PE equipment, filter label information if carry a described PE equipment support in the described BGP Open message by the RT attribute information, and described the 2nd PE equipment support is filtered label information by the RT attribute information, then described the 2nd PE equipment is collected the Import RT attribute information of all VPN instance on this 2nd PE equipment, and by BGP Refresh message the Import RT attribute information of all VPN instance is sent to a described PE equipment.
A described PE equipment is determined on this PE equipment in all VPN instance specifically to comprise corresponding to the VPN instance of described Import RT attribute information:
A described PE equipment extracts the Import RT attribute information of described the 2nd PE equipment, and the Export RT attribute of all VPN instance on more described Import RT attribute information and this PE equipment;
If have the Export RT attribute of VPN instance and described Import RT attribute information to be complementary, then a described PE equipment determines that this VPN instance is corresponding to described Import RT attribute information.
Described VPN instance is specially: virtual private exchange line road service VPWS example, or, virtual special local area network service VPLS example.
The embodiment of the invention provides a kind of routing device, be applied to comprise that a described PE equipment comprises in the multiprotocol label switching MPLS L2VPN L2VPN network of Border Gateway Protocol (BGP) neighbours' each other a PE equipment and the 2nd PE equipment as the first service provider network edge PE equipment:
Receiver module is used for after a described PE equipment and described the 2nd PE equipment are set up bgp neighbor, and reception is from the Import route target RT attribute information of described the 2nd PE equipment;
Determination module is used for determining that all virtual private network examples are corresponding to the VPN instance of described Import RT attribute information on this PE equipment;
Sending module, be used for by BGP Update message the label information of described VPN instance corresponding to described Import RT attribute information being sent to described the 2nd PE equipment, and carried the Export RT attribute of described VPN instance in the described BGP Update message.
Described determination module, the concrete Import RT attribute information that is used for extracting described the 2nd PE equipment, and the Export RT attribute of all VPN instance on more described Import RT attribute information and PE equipment originally; If have the Export RT attribute of VPN instance and described Import RT attribute information to be complementary, determine that then this VPN instance is corresponding to described Import RT attribute information.
The embodiment of the invention provides a kind of routing device, be applied to comprise that described the 2nd PE equipment comprises in the multiprotocol label switching MPLS L2VPN L2VPN network of Border Gateway Protocol (BGP) neighbours' each other a PE equipment and the 2nd PE equipment as the second service provider network edge PE equipment:
Collection module is used for collecting the Import RT attribute information of all virtual private network examples on the 2nd PE equipment after described the 2nd PE equipment and a described PE equipment are set up bgp neighbor;
Sending module is used for the Import RT attribute information of all VPN instance is sent to a described PE equipment;
Receiver module, be used for behind the VPN instance and transmission of all VPN instance corresponding to described Import RT attribute information on definite this PE equipment of a described PE equipment, receive the label information of the described VPN instance corresponding to described Import RT attribute information that a described PE equipment sends by BGP Update message, and carried the Export RT attribute of described VPN instance in the described BGP Update message.
Described sending module, concrete being used for sends to a described PE equipment by BGP Refresh message with the Import RT attribute information of all VPN instance.
Described collection module, concrete being used for when the BGP Open message of receiving from a described PE equipment, filter label information if carry a described PE equipment support in the described BGP Open message by the RT attribute information, and described the 2nd PE equipment support is filtered label information by the RT attribute information, and the Import RT attribute information of then collecting all VPN instance on this 2nd PE equipment also sends.
Compared with prior art, the embodiment of the invention has the following advantages at least: in the embodiment of the invention, the one PE equipment can be known the Import RT attribute information of the 2nd PE equipment, and by BGP Update message with this Import RT attribute information the label information of corresponding VPN instance send to the 2nd PE equipment, thereby can avoid transmitting unnecessary BGP Update message, and reduce the transmission quantity of BGP Update message.Further, can also reduce the label information quantity that a PE equipment sends to the 2nd PE equipment, thereby reduce facility load and the network burden that the 2nd PE device processes label information causes.
Description of drawings
Fig. 1 is the networking schematic diagram of MPLS L2VPN network in the prior art;
Fig. 2 is the schematic diagram of two BGP Update message transmissions label informations in the prior art;
Fig. 3 is the transmission method schematic flow sheet of a kind of label information of providing of the embodiment of the invention;
Fig. 4 is the schematic diagram that increases optional parameters in the embodiment of the invention in the BGP Open message newly;
Fig. 5 is at the BGP Refresh message format schematic diagram of VPWS example in the embodiment of the invention;
Fig. 6 is at the BGP Refresh message format schematic diagram of VPLS example in the embodiment of the invention;
Fig. 7 is the structural representation of a kind of routing device of providing of the embodiment of the invention;
Fig. 8 is the structural representation of the another kind of routing device that provides of the embodiment of the invention.
Embodiment
At problems of the prior art, the embodiment of the invention provides a kind of transmission method of label information, this method is applied to comprise in the MPLS L2VPN network (this MPLS L2VPN network is specifically as follows the MPLS L2VPN network of Kompella mode) of a PE equipment of bgp neighbor each other and the 2nd PE equipment, be example with application scenarios shown in Figure 1, the one PE equipment is PE1, and the 2nd PE equipment is PE2; Perhaps, a PE equipment is PE2, and the 2nd PE equipment is PE1; Follow-up is PE1 with a PE equipment, and the 2nd PE equipment is that PE2 is that example describes.
Based on above-mentioned application scenarios, as shown in Figure 3, this method may further comprise the steps:
In the embodiment of the invention, can also carry out capability negotiation between the one PE equipment and the 2nd PE equipment, have only when the two all supports by RT attribute information filtration label information (namely supporting the technical scheme that the embodiment of the invention provides), just the technical scheme that can adopt the embodiment of the invention to provide is handled; Otherwise, will handle according to existing execution mode, this processing procedure repeats no more.
Based on this, in a kind of preferred implementation of the embodiment of the invention, a PE equipment sends BGP Open(to the 2nd PE equipment to begin) message, whether the PE equipment that carries in this BGP Open message is supported to filter label information by the RT attribute information; The 2nd PE equipment is when the BGP Open message of receiving from a PE equipment, filter label information if carry a PE equipment support in the BGP Open message by the RT attribute information, and the 2nd PE equipment support is filtered label information by the RT attribute information, then the 2nd PE equipment is collected the Import RT attribute information of all VPN instance on this 2nd PE equipment, and by BGP Refresh message the Import RT attribute information of all VPN instance is sent to a PE equipment.
In specific implementation, can in BGP Open message, increase optional parameters as shown in Figure 4 newly, if carry this optional parameters in the BGP Open message, then show and support to filter label information by the RT attribute information; If do not carry this optional parameters in the BGP Open message, then show and do not support to filter label information by the RT attribute information; Therefore, the 2nd PE equipment is when the BGP Open message of receiving from a PE equipment, if carry this optional parameters in the BGP Open message, but the 2nd PE equipment is not supported to filter label information by the RT attribute information, the merit of then failing to consultations is handled according to existing execution mode; If do not carry this optional parameters in the BGP Open message, the merit of then failing to consultations is handled according to existing execution mode; If carry this optional parameters in the BGP Open message, and the 2nd PE equipment support is filtered label information by the RT attribute information, then consults successfully, handles according to the technical scheme that the embodiment of the invention provides, namely carry out above-mentioned step 301 and 302, and subsequent step.
In the embodiment of the invention, VPN instance is specifically as follows: VPWS example or VPLS example.In optional parameters shown in Figure 4, the Type(type at the VPWS example can be set) field is 111, the type field that arranges at the VPLS example is 112.
In the embodiment of the invention, based on existing BGP Refresh message, can be by in BGP Refresh message, increasing Route Target information TLV(Type Length Value newly, type lengths values), thus make the 2nd PE equipment that the Import RT attribute information of all VPN instance is sent to a PE equipment.
As shown in Figure 5, be the form schematic diagram at the BGP Refresh message of VPWS example; Wherein, the type field is 1 byte, and type definition is 88; The length field is 2 bytes, is defined as the length summation of value value; The value value field is filled in the Import RT attribute information (being Import route target attribute) of the 2nd all VPWS examples of PE equipment; In addition, when the 2nd PE equipment wishes to receive the label information of all VPWS examples of PE equipment, then the value field can be extended this as complete 0.
Under application scenarios shown in Figure 1, because the Import route target attribute that the 2nd PE equipment (PE2) is gone up in all VPWS examples has only 100:1, therefore 100:1 need be filled up to the value field of the Route Target information TLV of BGP Refresh message, and because the value field has only an Import route target value, therefore the length field is filled in 8 bits, as shown in Figure 5.
As shown in Figure 6, be the form schematic diagram at the BGP Refresh message of VPLS example; Wherein, the type field is 1 byte, and type definition is 89; The length field is 2 bytes, is defined as the length summation of value value; The value value field is filled in the Import RT attribute information (being Import route target attribute) of the 2nd all VPLS examples of PE equipment; In addition, when the 2nd PE equipment wishes to receive the label information of all VPLS examples of PE equipment, then the value field can be extended this as complete 0.
Under application scenarios shown in Figure 1, because the Import route target attribute that the 2nd PE equipment (PE2) is gone up in all VPLS examples has only 100:1, therefore 100:1 need be filled up to the value field of the Route Target information TLV of BGP Refresh message, and because the value field has only an Import route target value, therefore the length field is filled in 8 bits, as shown in Figure 6.
In the embodiment of the invention, a PE equipment is known the Import route target attribute (the Import RT attribute information in the BGP Refresh message) that the 2nd PE equipment needs after the BGP Refresh message of receiving from the 2nd PE equipment; Based on this, a PE equipment need be selected the VPN instance corresponding to this Import RT attribute information in local all VPN instance.
Concrete, a PE equipment extracts the Import RT attribute information of the 2nd PE equipment from BGP Refresh message, and the Export route target attribute of all VPN instance on this Import RT attribute information and the PE equipment relatively; If have the Export route target attribute of VPN instance and Import RT attribute information to be complementary, determine that then this VPN instance is corresponding to this Import RT attribute information.
Under application scenarios shown in Figure 1, the one PE equipment can know from BGP Refresh message that the Import route target attribute that the 2nd PE equipment needs is 100:1, and the Export route target attribute of VPN1 is 100:1 on the PE equipment, the Export route target attribute of VPN2 is 200:1, and namely a PE equipment determines that VPN1 is corresponding to the Import RT attribute information (100:1) in the BGP Refresh message.
In the embodiment of the invention, after a PE equipment and the 2nd PE equipment are set up bgp neighbor, the one PE equipment did not send BGP Update message to the 2nd PE equipment before not receiving the BGP Refresh message that carries Route Target information TLV; The one PE equipment is after receiving the BGP Refresh message that carries Route Target information TLV, if the local VPN instance that does not have the Import RT attribute information correspondence of the 2nd PE equipment does not then send BGP Update message to the 2nd PE equipment; If the local VPN instance that the Import RT attribute information correspondence of the 2nd PE equipment is arranged then sends the BGP Update message of this VPN instance correspondence to the 2nd PE equipment; If the value field is complete 0 among the Route Target information TLV, then send the label information of all VPN instance by BGP Update message.
Under application scenarios shown in Figure 1, last all VPN instance of PE1 are that VPN1(Export route target is 100:1) and VPN2(Export route target be 200:1), the last VPN instance of PE2 is that VPN1(Import route target is 100:1); After adopting the technical scheme that the embodiment of the invention provides, PE1 only need send to PE2 with the label information of VPN1 example by a BGP Update message, and the Export RT attribute that carries in this BGP Update message is 100:1; PE2 is after receiving this BGP Update message, by Import route target(100:1 relatively) and BGP Update message in the Export RT attribute that carries, can accept Export RT attribute is the BGP Update message of 100:1; Obviously, said process can avoid transmitting unnecessary BGP Update message, and reduces the transmission quantity of BGP Update message.Further, can reduce by a PE equipment to the label information quantity that the 2nd PE equipment sends, reduce facility load and network burden that the 2nd PE device processes label information causes.
In the embodiment of the invention, after the 2nd PE equipment and a PE equipment are successfully set up bgp neighbor, if increased VPN instance (VPWS example or VPLS example) on the 2nd PE equipment newly, then the 2nd PE equipment need extract the Import RT attribute information (being Import route target attribute) of this newly-increased VPN instance, and by BGP Refresh message (as Fig. 5 or shown in Figure 6) this Import RT attribute information is sent to a PE equipment; By a PE equipment after receiving this BGP Refresh message, determine on this PE equipment in all VPN instance the VPN instance corresponding to this Import RT attribute information, and by BGP Update message the label information of the VPN instance determined is sent to the 2nd PE equipment.
Based on the inventive concept same with said method, a kind of routing device also is provided in the embodiment of the invention, be applied to comprise as the first service provider network edge PE equipment in the multiprotocol label switching MPLS L2VPN L2VPN network of Border Gateway Protocol (BGP) neighbours' each other a PE equipment and the 2nd PE equipment, as shown in Figure 7, a described PE equipment comprises:
Receiver module 11 is used for after a described PE equipment and described the 2nd PE equipment are set up bgp neighbor, and reception is from the Import route target RT attribute information of described the 2nd PE equipment;
Determination module 12 is used for determining that all virtual private network examples are corresponding to the VPN instance of described Import RT attribute information on this PE equipment;
Sending module 13, be used for by BGP Update message the label information of described VPN instance corresponding to described Import RT attribute information being sent to described the 2nd PE equipment, and carried the Export RT attribute of described VPN instance in the described BGP Update message.
In the embodiment of the invention, described determination module 12, the concrete Import RT attribute information that is used for extracting described the 2nd PE equipment, and the Export RT attribute of all VPN instance on more described Import RT attribute information and PE equipment originally; If have the Export RT attribute of VPN instance and described Import RT attribute information to be complementary, determine that then this VPN instance is corresponding to described Import RT attribute information.
Wherein, each module of apparatus of the present invention can be integrated in one, and also can separate deployment.Above-mentioned module can be merged into a module, also can further split into a plurality of submodules.
Based on the inventive concept same with said method, a kind of routing device also is provided in the embodiment of the invention, be applied to comprise as the second service provider network edge PE equipment in the multiprotocol label switching MPLS L2VPN L2VPN network of Border Gateway Protocol (BGP) neighbours' each other a PE equipment and the 2nd PE equipment, as shown in Figure 8, described the 2nd PE equipment comprises:
Collection module 21 is used for collecting the Import RT attribute information of all virtual private network examples on the 2nd PE equipment after described the 2nd PE equipment and a described PE equipment are set up bgp neighbor;
Sending module 22 is used for the Import RT attribute information of all VPN instance is sent to a described PE equipment;
Receiver module 23, be used for behind the VPN instance and transmission of all VPN instance corresponding to described Import RT attribute information on definite this PE equipment of a described PE equipment, receive the label information of the described VPN instance corresponding to described Import RT attribute information that a described PE equipment sends by BGP Update message, and carried the Export RT attribute of described VPN instance in the described BGP Update message.
In the embodiment of the invention, described sending module 22, concrete being used for sends to a described PE equipment by BGP Refresh message with the Import RT attribute information of all VPN instance.
In the embodiment of the invention, described collection module 21, concrete being used for when the BGP Open message of receiving from a described PE equipment, filter label information if carry a described PE equipment support in the described BGP Open message by the RT attribute information, and described the 2nd PE equipment support is filtered label information by the RT attribute information, and the Import RT attribute information of then collecting all VPN instance on this 2nd PE equipment also sends.
Wherein, each module of apparatus of the present invention can be integrated in one, and also can separate deployment.Above-mentioned module can be merged into a module, also can further split into a plurality of submodules.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium, comprise that some instructions are with so that a 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 schematic diagram of a preferred embodiment, the module in the accompanying drawing or flow process might not be that enforcement 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 above-described embodiment can be merged into a module, also can further split into a plurality of submodules.
The invention described above embodiment sequence number does not represent the quality of embodiment just to description.
More than disclosed only be 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 (10)
1. the transmission method of a label information, be applied to comprise in the multiprotocol label switching MPLS L2VPN L2VPN network of Border Gateway Protocol (BGP) neighbours' each other the first service provider network edge PE equipment and the 2nd PE equipment, it is characterized in that this method may further comprise the steps:
After a described PE equipment and described the 2nd PE equipment were set up bgp neighbor, a described PE equipment received the Import route target RT attribute information from described the 2nd PE equipment;
A described PE equipment is determined on this PE equipment in all virtual private network examples the VPN instance corresponding to described Import RT attribute information;
A described PE equipment sends to described the 2nd PE equipment by BGP Update message with the label information of described VPN instance corresponding to described Import RT attribute information, and has carried the Export RT attribute of described VPN instance in the described BGP Update message.
2. the method for claim 1 is characterized in that, before the Import route target RT attribute information of described PE equipment reception from described the 2nd PE equipment, described method also comprises:
After described the 2nd PE equipment and a described PE equipment are set up bgp neighbor, described the 2nd PE equipment is collected the Import RT attribute information of all VPN instance on this 2nd PE equipment, and by BGP Refresh message the Import RT attribute information of all VPN instance is sent to a described PE equipment.
3. method as claimed in claim 2, it is characterized in that, described the 2nd PE equipment is collected the Import RT attribute information of all VPN instance on this 2nd PE equipment, and by BGP Refresh message the Import RT attribute information of all VPN instance is sent to a described PE equipment, specifically comprise:
Described the 2nd PE equipment is when the BGP Open message of receiving from a described PE equipment, filter label information if carry a described PE equipment support in the described BGP Open message by the RT attribute information, and described the 2nd PE equipment support is filtered label information by the RT attribute information, then described the 2nd PE equipment is collected the Import RT attribute information of all VPN instance on this 2nd PE equipment, and by BGP Refresh message the Import RT attribute information of all VPN instance is sent to a described PE equipment.
4. the method for claim 1 is characterized in that, a described PE equipment is determined on this PE equipment in all VPN instance specifically to comprise corresponding to the VPN instance of described Import RT attribute information:
A described PE equipment extracts the Import RT attribute information of described the 2nd PE equipment, and the Export RT attribute of all VPN instance on more described Import RT attribute information and this PE equipment;
If have the Export RT attribute of VPN instance and described Import RT attribute information to be complementary, then a described PE equipment determines that this VPN instance is corresponding to described Import RT attribute information.
5. as each described method of claim 1-4, it is characterized in that described VPN instance is specially: virtual private exchange line road service VPWS example, or, virtual special local area network service VPLS example.
6. routing device, be applied to comprise as the first service provider network edge PE equipment in the multiprotocol label switching MPLS L2VPN L2VPN network of Border Gateway Protocol (BGP) neighbours' each other a PE equipment and the 2nd PE equipment, it is characterized in that a described PE equipment comprises:
Receiver module is used for after a described PE equipment and described the 2nd PE equipment are set up bgp neighbor, and reception is from the Import route target RT attribute information of described the 2nd PE equipment;
Determination module is used for determining that all virtual private network examples are corresponding to the VPN instance of described Import RT attribute information on this PE equipment;
Sending module, be used for by BGP Update message the label information of described VPN instance corresponding to described Import RT attribute information being sent to described the 2nd PE equipment, and carried the Export RT attribute of described VPN instance in the described BGP Update message.
7. equipment as claimed in claim 6 is characterized in that,
Described determination module, the concrete Import RT attribute information that is used for extracting described the 2nd PE equipment, and the Export RT attribute of all VPN instance on more described Import RT attribute information and PE equipment originally; If have the Export RT attribute of VPN instance and described Import RT attribute information to be complementary, determine that then this VPN instance is corresponding to described Import RT attribute information.
8. routing device, be applied to comprise as the second service provider network edge PE equipment in the multiprotocol label switching MPLS L2VPN L2VPN network of Border Gateway Protocol (BGP) neighbours' each other a PE equipment and the 2nd PE equipment, it is characterized in that described the 2nd PE equipment comprises:
Collection module is used for collecting the Import RT attribute information of all virtual private network examples on the 2nd PE equipment after described the 2nd PE equipment and a described PE equipment are set up bgp neighbor;
Sending module is used for the Import RT attribute information of all VPN instance is sent to a described PE equipment;
Receiver module, be used for behind the VPN instance and transmission of all VPN instance corresponding to described Import RT attribute information on definite this PE equipment of a described PE equipment, receive the label information of the described VPN instance corresponding to described Import RT attribute information that a described PE equipment sends by BGP Update message, and carried the Export RT attribute of described VPN instance in the described BGP Update message.
9. equipment as claimed in claim 8 is characterized in that,
Described sending module, concrete being used for sends to a described PE equipment by BGP Refresh message with the Import RT attribute information of all VPN instance.
10. equipment as claimed in claim 8 is characterized in that,
Described collection module, concrete being used for when the BGP Open message of receiving from a described PE equipment, filter label information if carry a described PE equipment support in the described BGP Open message by the RT attribute information, and described the 2nd PE equipment support is filtered label information by the RT attribute information, and the Import RT attribute information of then collecting all VPN instance on this 2nd PE equipment also sends.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104980362A (en) * | 2014-04-04 | 2015-10-14 | 华为技术有限公司 | Business tunnel establishment method and business tunnel establishment device |
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