CN100488164C - MSTP device and method for realizing pseudo wire emulation edge-to-edge business - Google Patents
MSTP device and method for realizing pseudo wire emulation edge-to-edge business Download PDFInfo
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- CN100488164C CN100488164C CNB2005100375408A CN200510037540A CN100488164C CN 100488164 C CN100488164 C CN 100488164C CN B2005100375408 A CNB2005100375408 A CN B2005100375408A CN 200510037540 A CN200510037540 A CN 200510037540A CN 100488164 C CN100488164 C CN 100488164C
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Abstract
The invention provides a method for implementing edge-to-edge pseudolinear simulation service in an MSTP device, comprising the steps of: first data processing board receives user data through auxiliary circuit and adds tags to the user data to form a message to be transmitted in virtual channel between the first and second data processing boards, where the tags comprise service tag and internal tunnel tag; the first data processing board transmits the message through the virtual channel corresponding to the internal tunnel tag to the second data processing board; the second data processing board exchanges external tunnel tag for the internal tunnel tag and transmits the message via data interface to network. And it provides an MSTP device for implementing edge-to- edge pseudolinear simulation service. And it can automatically allocate internal tag and implement automatic allocation of internal and external tags.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of multiservice transport platform (Multiple Service Transmit Platform that realizes pseudo wire emulation edge-to-edge business, be called for short MSTP) equipment and on MSTP equipment, realize the professional method of edge-to-edge pseudo-line simulation (Pseudo Wire Emulation Edge toEdge is called for short PWE3).
Background technology
Edge-to-edge pseudo-line simulation (Pseudo Wire Emulation Edge to Edge, be called for short PWE3) be by the Internet engineering duty group (Internet Engineering Task Force, be called for short IETF) formulation of subordinate working group, be used on the packet switching network (Packet Switch Network is called for short PSN), providing the traditional ground floor and the technology of second layer Network.
The business model definition of PWE3 on PSN is as Fig. 1, two provider's fringe node (Provide Edge of network edge, abbreviation PE) PE1, PE2 are the customer edge nodes (CustomerEdge that it connected, abbreviation CE) CE1, CE2 provide one or more pseudo-line (Pseudo Wire, be called for short PW), for example pseudo-line PW1 of two shown in the figure and PW2, making can be at the PSN network communication between customer edge nodes CE1, the CE2.On a PSN tunnel (PSN TUNNEL), can realize that two PW between the PE are multiplexing.During operation, the user service data of customer edge nodes such as CE1 is from auxiliary circuit (Attachment Circuit, abbreviation AC) side joint is gone into, finish the PW encapsulation earlier, stamping one deck vpn label by edge router is the PW label, finish tunnel encapsulation, after stamping one deck outer layer label and be tunnel (TUNNEL) label by edge router again, transmit.After arriving destination, need edge router to handle outer field TUNNEL label earlier, handle the PW label again.
At present, PWE3 is used on the router device more.On the data equipment owing to be not to adopt the VCG interconnection between the inner first data veneer and the second data veneer, the second data veneer does not need to use tunnel label to carry out pathfinding.Because the data veneer of existing MSTP equipment is merely able to MPLS (the Multiprotocol Label Switch of the standard of handling, multiprotocol label switching) label, do not support the expansion of nonstandardized technique, therefore PWE3 can not use with synchronous digital hierarchy (Synchronos Digital Hierarchy, SDH) equipment is on the MSTP equipment on basis, particularly have on the MSTP equipment that time division multiplexing (Time Division Multiplex, be called for short TDM) intersects and use.
Summary of the invention
The technical problem to be solved in the present invention is the restriction that overcomes above-mentioned prior art, a kind of MSTP Apparatus and method for of realizing pseudo wire emulation edge-to-edge business is provided, can on based on the MSTP equipment of SDH equipment, realize the PWE3 business, and can distribute inner tunnel label automatically.
The invention provides a kind of method that realizes pseudo wire emulation edge-to-edge business, in the multiservice transport platform MSTP equipment that comprises the first data processing plate that connects by the Virtual Channel group and the second data processing plate, realize, this first data processing plate links to each other with auxiliary circuit through its data-interface, this second data processing plate links to each other with network through its data-interface, described method comprises the steps: on the up direction from the auxiliary electrical trackside to network side
(a) the first data processing plate is this user data label allocation also through the auxiliary circuit receiving subscriber data, the message that formation can transmit in the Virtual Channel group between the first data processing plate and the second data processing plate, this label comprises service label and internal tunnel label, and described service label and described internal tunnel label are complementary;
(b) the first data processing plate is sent to the second data processing plate by the Virtual Channel of this internal tunnel label correspondence with described message; And
(c) the second data processing plate exchanges the internal tunnel label of described message with the outer tunnel label, and described message is transmitted into network by data-interface.
The step of the tag configurations method of user data in the described step (a) specifically comprises:
(a1) be MSTP devices allocation and auxiliary circuit corresponding service label and respective external tunnel label, and specify the maximum transfer unit value and the flow parameter of this auxiliary circuit;
(a2) be that its first data processing plate and the second data processing plate distribute the internal tunnel label; And
(a3) carry out the coupling of service label and internal tunnel label, and on the first data processing plate and the second data processing plate, generate different Label Forwarding Information Base, and issue hardware.
Described step (a2) further comprises:
(a21) time division multiplexing of generation Virtual Channel group connects between the first data processing plate, the second data processing plate;
(a22) judge that can the Virtual Channel group between the first data processing plate, the second data processing plate as a passage use;
(a23) if can use, then distribute a tunnel, give the first data processing plate and the second data processing plate the internal tunnel label distribution of this tunnel correspondence as the passage between the first data processing plate, the second data processing plate as a passage;
(a24) if can not use as a passage, then be that different Virtual Channels distributes different tunnels, give the first data processing plate and the second data processing plate with the internal tunnel label distribution of each tunnel correspondence, write down the flow parameter of each pairing Virtual Channel in tunnel.
Described step (a3) further comprises:
(a31) judge whether the tunnel between the first data processing plate, the second data processing plate is unique;
(a32) if unique, then that service label is corresponding with this tunnel internal tunnel tag match;
(a33) if not unique, then carry out the service channel routing, comprise the steps:
(a331) whether disposed flow parameter on the identification services passage;
(a332) if do not dispose flow parameter on the service channel, then adopt and mate at random service label and internal tunnel tag match, make two continuous service channels use different tunnels;
(a333) if dispose flow parameter on the service channel, then adopt the traffic engineering mode with service label and internal tunnel tag match.
Adopt endless form to realize coupling at random in the described step (a332), this endless form comprises:
(1) with all tunnel numbers, numbering counts from zero, and the tunnel whenever is used once, and tunnel number adds 1;
(2) during current business passage coupling tunnel, the tunnel number that service channel is formerly used adds 1 is newly numbered, again will this current service label and the internal tunnel tag match in tunnel that should new numbering correspondence; And
(3) when tunnel number during greater than the tunnel number between the first data processing plate and the second data processing plate, the numbering zero clearing.
Described traffic engineering mode further comprises:
(1) judges in current a plurality of tunnels whether the passage that satisfies this service channel flow parameter is arranged;
(2) if do not have, then the tunnel can't satisfy professional passage demand, generates the indication of service fail information;
(3) if having, then from many tunnels, select the passage of a service channel flow parameter the most suitable, with the internal tunnel tag match in service label and selected tunnel, and from tunnel resource, deduct this selected tunnel.
Described step (a1) is set by the user or is realized distributing and specifying by signaling protocol.
Described flow parameter is bandwidth or protection level.
Described service label is a pseudo line tag, and described service channel is pseudo-line.
The present invention also provides a kind of multiservice transport platform MSTP equipment of realizing pseudo wire emulation edge-to-edge business, comprise the first data processing plate and the second data processing plate, this first data processing plate is connected by the Virtual Channel group with the second data processing plate, wherein the first data processing plate is this user data configuration service label and internal tunnel label also through the data-interface receiving subscriber data, described service label and described internal tunnel label are complementary, the message that formation can transmit in described Virtual Channel group, and the Virtual Channel that passes through the internal tunnel label correspondence that disposed is sent to the described second data processing plate with this message; This second data processing plate exchanges the internal tunnel label of described message with the outer tunnel label, and described message is transmitted into network by data-interface.
The time division multiplexing that between the described first data processing plate and the second data processing plate is the Virtual Channel group connects.
The present invention can realize that the polylith veneer is collaborative on based on the MSTP equipment of SDH equipment and finish the PWE3 business, and can distribute inner label automatically, realizes the automatic coupling of inside and outside layer of label, and method is easy, and is easy to implement.
Description of drawings
Fig. 1 is the structural representation of the business model of existing edge-to-edge pseudo-line simulation on PSN.
Fig. 2 is the structural representation of one embodiment of the invention.
Fig. 3 is the flow chart of the tag configurations from the auxiliary electrical trackside to the network side up direction of the present invention.
Fig. 4 is the flow chart that first, second data processing plate distributes the internal tunnel label for the present invention.
Fig. 5 is the flow chart of the pseudo-line up direction routing of the first data processing plate of the present invention.
Fig. 6 has the structural representation of the MSTP equipment of many Virtual Channels for the present invention.
Fig. 7 is the structural representation of another embodiment of the present invention.
Embodiment
The embodiment of the invention is chiefly directed to method and this MSTP equipment by realization PWE3 business on the MSTP equipment of the continuous polylith veneer collaborative work of inner Virtual Channel group (Virtual Channel Group is called for short VCG).
The model of this MSTP equipment as shown in Figure 2, first, second data processing plate 10,11 on this MSTP equipment 1 links to each other with auxiliary circuit AC, external network through data-interface respectively, linked to each other by Virtual Channel group VCG between this first, second data processing plate 10,11, this Virtual Channel group VCG sets up TDM and connects between first, second data processing plate 10,11.
On up direction from the auxiliary electrical trackside to network side, when user data when auxiliary circuit AC side joint is gone into the first data processing plate 10, be this user data configuration inner label (vpn label and outer layer label) by the first data processing plate 10, and stamp internal layer service label---pseudo line tag PW label earlier, stamp the outer layer label that is complementary with pseudo line tag PW label again---internal tunnel label TUNNEL label ', deliver to the second data processing plate 11 of network side then by the Virtual Channel between the pairing plate of this internal tunnel label TUNNEL label '.After the second data processing plate 11 is received this message, finish the exchange of outer layer label, be about to outer field internal tunnel label TUNNEL label ' and convert outer tunnel label TUNNEL label to, message is sent by data-interface enter network again.
Particularly, wherein the tag configurations method of user data as shown in Figure 3, at first at step S100, be label PW label and the corresponding outer tunnel label TUNNEL label of the MSTP devices allocation pseudo-line corresponding at up, the down direction of network side with auxiliary circuit AC, and the relevant parameter information of specifying auxiliary circuit AC: maximum transfer unit value (Maximum Transmission Unit is called for short MTU) and bandwidth.This distribution and appointment can also can be realized by signaling protocol by manual setting of user.
Secondly at step S110, be that internal tunnel label TUNNEL label ' is distributed by the two data processing plates 10,11 that Virtual Channel group VCG links to each other in its inside by MSTP equipment.The process of this distribution internal tunnel label TUNNEL label ' at step S111, is generated the TDM connection of the Virtual Channel group VCG between first, second data processing plate 10,11 as shown in Figure 4 by user's appointment or other modes.Then, at step S112, SMTP equipment judges that can the Virtual Channel group VCG between first, second data processing plate 10,11 use as a passage.If can use as a passage,, only distribute a tunnel TUNNEL as the passage between first, second data processing plate 10,11 then at step S113; If can not use as a passage; execution in step S114 then; for different Virtual Channels distributes different tunnel TUNNEL; give the first data processing plate and the second data processing plate with the internal tunnel label distribution of each tunnel correspondence; write down the flow parameter such as bandwidth, protection level of the pairing Virtual Channel of each tunnel TUNNEL simultaneously, and be that different tunnel TUNNEL gives different bandwidth parameters according to the bandwidth of Virtual Channel at step S115.
Return Fig. 3 then, execution in step S120 carries out the coupling of pseudo line tag PW label and internal tunnel label TUNNEL label ', generates different Label Forwarding Information Base on first, second data processing plate 10,11, and issues hardware.The matching process of pseudo line tag PW label and internal tunnel label TUNNEL label ' as shown in Figure 5, at first at step S121, MSTP equipment judges whether the tunnel TUNNEL between first, second data processing plate 10,11 is unique, if unique, then finish the coupling of the pseudo line tag PW label of the business on the first data processing plate up direction of the auxiliary electrical trackside internal tunnel label TUNNEL label ' corresponding with this tunnel TUNNEL at step S122; If the tunnel between first, second data processing plate 10,11 is not unique, for example shown in Figure 6ly have two tunnel TUNNEL ' and TUNNEL ", then carry out the pseudo-line selection road of the pseudo-line PW up direction of the first data processing plate 10.
The execution in step S123 of this routing process elder generation; whether tunnel TUNNEL has disposed flow parameters such as bandwidth, protection level by identification, when judging pseudo line tag PW label and internal tunnel label TUNNEL label ' coupling is to adopt the traffic engineering mode to mate or mate at random.
If do not dispose the flow parameter information on the tunnel TUNNEL, then execution in step S124 adopts and mates at random pseudo line tag PW label and internal tunnel label TUNNEL label ' coupling, guarantees that two continuous pseudo-line PW use different tunnels.In the present embodiment, adopt endless form (also can adopt other random fashion), at first with the unified numbering in all tunnels, numbering ID counts from zero, and the tunnel whenever is used once, and tunnel number ID will be added 1.During current pseudo-line PW coupling tunnel, the tunnel number ID that finds its formerly pseudo-line PW to use earlier, this numbering is added 1 newly numbered ID, finish the pseudo line tag PW label of this current pseudo-line PW and be somebody's turn to do the coupling of the internal tunnel label TUNNEL label ' of the tunnel TUNNEL of numbering ID correspondence newly at step S125.As tunnel number ID during greater than the tunnel passage number between the data processing plate, numbering ID zero clearing.
If tunnel TUNNEL disposes flow parameter information, then execution in step S126 adopts the traffic engineering mode with pseudo line tag PW label and internal tunnel label TUNNEL label ' coupling.Judge at first among current a plurality of tunnel TUNNEL whether the passage that satisfies this puppet linear flow rate parameter is arranged, if do not have, represent that then tunnel TUNNEL can't satisfy the passage demand of pseudo-line PW, the professional generation failed, and S127 jumps out from step, generates the indication of service fail information.If have, execution in step S128 then, from many tunnel TUNNEL, select the passage of a pseudo-linear flow rate parameter the most suitable, finish the coupling of the internal tunnel label TUNNEL label ' of the pseudo line tag PW label of this puppet line PW and selected tunnel TUNNEL, and from tunnel resource, deduct the already used resource of this puppet line PW at step S129.
The result of routing has realized the coupling of pseudo-line PW and tunnel TUNNEL, it is pseudo line tag PW label and internal tunnel label TUNNEL label ' configuration, and generate Label Forwarding Information Base thus, issue hardware, just can by the first data processing plate 10 this label beaten on user data successively on the up direction, and message is being sent to the second data processing plate 11 by the Virtual Channel between the selected pairing plate of tunnel TUNNEL.
Inversely, at network side to the down direction of auxiliary electrical trackside, when the second data processing plate 11 of network side receives the message of automatic network, elder generation's bullet falls outer field outer tunnel label TUNNEL label, then by finishing the exchange of pseudo line tag PW label to self, find the pairing Virtual Channel of this pseudo line tag PW label, message is sent to the first data processing plate 10 of auxiliary circuit AC side by this corresponding Virtual Channel.Handle pseudo line tag PW label by this first data processing plate 10, bullet falls this pseudo line tag PW label, and user data is sent to auxiliary circuit AC by data-interface, is resent to user side.
As another kind of execution mode, on the down direction, the second data processing plate 11 of network side is finished pseudo line tag PW label after the exchange of self, stamps outer layer label again---internal tunnel label TUNNELlabel " ', send to the first data processing plate 10 of auxiliary circuit AC side.These first data processing plate, 10 first bullets fall outer field internal tunnel label TUNNEL label " ' again bullet fall the pseudo line tag PW label of internal layer, as shown in Figure 7.The internal tunnel label TUNNEL label of down direction wherein " ' the method for salary distribution and the method for salary distribution of the internal tunnel label TUNNEL label ' of aforementioned up direction consistent; promptly carry out the coupling of the internal tunnel label TUNNEL label ' of pseudo line tag PW label in the mode identical with up direction, specifically can be with reference to aforementioned content.
The present invention can realize the collaborative pseudo wire emulation edge-to-edge business of finishing of polylith veneer on the MSTP equipment that particularly has the TDM intersection based on SDH equipment, and can distribute inner label automatically, realize the automatic coupling of inside and outside layer label, and method is easy, easy to implement.In addition, the automatic coupling of the distribution of inner label of the present invention and inside and outside layer label not only is applicable to pseudo-line service, also can be used for other type of service, so the interior business label is not limited only to pseudo line tag, also comprises other service label.
Claims (12)
1, a kind of method that realizes pseudo wire emulation edge-to-edge business, it is characterized in that, in the multiservice transport platform MSTP equipment that comprises the first data processing plate that connects by the Virtual Channel group and the second data processing plate, realize, this first data processing plate links to each other with auxiliary circuit through its data-interface, this second data processing plate links to each other with network through its data-interface, described method comprises the steps: on the up direction from the auxiliary electrical trackside to network side
(a) the first data processing plate is this user data label allocation also through the auxiliary circuit receiving subscriber data, the message that formation can transmit in the Virtual Channel group between the first data processing plate and the second data processing plate, this label comprises service label and internal tunnel label, and described service label and described internal tunnel label are complementary;
(b) the first data processing plate is sent to the second data processing plate by the Virtual Channel of this internal tunnel label correspondence with described message; And
(c) the second data processing plate exchanges the internal tunnel label of described message with the outer tunnel label, and described message is transmitted into network by data-interface.
2, method according to claim 1 is characterized in that, the step of the tag configurations method of user data in the described step (a) specifically comprises:
(a1) be MSTP devices allocation and auxiliary circuit corresponding service label and respective external tunnel label, and specify the maximum transfer unit value and the flow parameter of this auxiliary circuit;
(a2) be that the first data processing plate and the second data processing plate distribute the internal tunnel label; And
(a3) carry out the coupling of service label and internal tunnel label, and on the first data processing plate and the second data processing plate, generate different Label Forwarding Information Base, and issue hardware.
3, method according to claim 2 is characterized in that, described step (a2) further comprises:
(a21) time division multiplexing of generation Virtual Channel group connects between the first data processing plate, the second data processing plate;
(a22) judge that can the Virtual Channel group between the first data processing plate, the second data processing plate as a passage use;
(a23) if can use, then distribute a tunnel, give the first data processing plate and the second data processing plate the internal tunnel label distribution of this tunnel correspondence as the passage between the first data processing plate, the second data processing plate as a passage;
(a24) if can not use as a passage, then be that different Virtual Channels distributes different tunnels, give the first data processing plate and the second data processing plate with the internal tunnel label distribution of each tunnel correspondence, write down the flow parameter of each pairing Virtual Channel in tunnel.
4, method according to claim 3 is characterized in that, described step (a3) further comprises:
(a31) judge whether the tunnel between the first data processing plate, the second data processing plate is unique;
(a32) if unique, then that service label is corresponding with this tunnel internal tunnel tag match;
(a33) if not unique, then carry out the service channel routing, comprise the steps:
(a331) whether disposed flow parameter on the identification services passage;
(a332) if do not dispose flow parameter on the service channel, then adopt and mate at random service label and internal tunnel tag match, make two continuous service channels use different tunnels;
(a333) if dispose flow parameter on the service channel, then adopt the traffic engineering mode with service label and internal tunnel tag match.
5, method according to claim 4 is characterized in that, adopts endless form to realize coupling at random in the described step (a332), and this endless form comprises:
(1) with all tunnel numbers, numbering counts from zero, and the tunnel whenever is used once, and tunnel number adds 1;
(2) during current business passage coupling tunnel, the tunnel number that service channel is formerly used adds 1 is newly numbered, again will this current service label and the internal tunnel tag match in tunnel that should new numbering correspondence; And
(3) when tunnel number during greater than the tunnel number between the first data processing plate and the second data processing plate, the numbering zero clearing.
6, method according to claim 4 is characterized in that, described traffic engineering mode further comprises:
(1) judges in current a plurality of tunnels whether the passage that satisfies this service channel flow parameter is arranged;
(2) if do not have, then the tunnel can't satisfy professional passage demand, generates the indication of service fail information;
(3) if having, then from many tunnels, select the passage of a service channel flow parameter the most suitable, with the internal tunnel tag match in service label and selected tunnel, and from tunnel resource, deduct this selected tunnel.
7, method according to claim 2 is characterized in that, described step (a1) is set by the user or is realized distributing and specifying by signaling protocol.
8, method according to claim 2 is characterized in that, described flow parameter is bandwidth or protection level.
9, according to the arbitrary described method of claim 1 to 8, it is characterized in that described service label is a pseudo line tag.
10, according to the arbitrary described method of claim 4 to 6, it is characterized in that described service label is a pseudo line tag, described service channel is pseudo-line.
11, a kind of multiservice transport platform MSTP equipment of realizing pseudo wire emulation edge-to-edge business, it is characterized in that, comprise the first data processing plate and the second data processing plate, this first data processing plate is connected by the Virtual Channel group with the second data processing plate, wherein the first data processing plate is this user data configuration service label and internal tunnel label also through the data-interface receiving subscriber data, described service label and described internal tunnel label are complementary, the message that formation can transmit in described Virtual Channel group, and the Virtual Channel that passes through the internal tunnel label correspondence that disposed is sent to the described second data processing plate with this message; This second data processing plate exchanges the internal tunnel label of described message with the outer tunnel label, and described message is transmitted into network by data-interface.
12, MSTP equipment according to claim 12 is characterized in that, is that the time division multiplexing of Virtual Channel group connects between the described first data processing plate and the second data processing plate.
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| CNB2005100375408A CN100488164C (en) | 2005-09-22 | 2005-09-22 | MSTP device and method for realizing pseudo wire emulation edge-to-edge business |
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| CNB2005100375408A CN100488164C (en) | 2005-09-22 | 2005-09-22 | MSTP device and method for realizing pseudo wire emulation edge-to-edge business |
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| CN100488164C true CN100488164C (en) | 2009-05-13 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100555999C (en) * | 2007-08-13 | 2009-10-28 | 中兴通讯股份有限公司 | A kind of method and apparatus of realizing edge-to-edge pseudo-line simulation |
| CN101931582B (en) * | 2009-06-24 | 2012-07-18 | 中兴通讯股份有限公司 | Method and device for implementing Ethernet two-layer pseudo wire emulation service |
| CN101714937B (en) * | 2009-11-16 | 2013-08-07 | 中兴通讯股份有限公司 | Device and method for end-to-end pseudowire emulation access |
| CN104734956B (en) * | 2012-02-13 | 2018-06-15 | 华为技术有限公司 | The method of service routing system and business processing, equipment |
| CN105591800B (en) * | 2015-07-29 | 2019-05-24 | 新华三技术有限公司 | Flow rate protecting method and device |
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