CN101754059A - Secondary label forwarding method hierarchically driven by multiple services in optical packet network - Google Patents
Secondary label forwarding method hierarchically driven by multiple services in optical packet network Download PDFInfo
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- CN101754059A CN101754059A CN200910242891A CN200910242891A CN101754059A CN 101754059 A CN101754059 A CN 101754059A CN 200910242891 A CN200910242891 A CN 200910242891A CN 200910242891 A CN200910242891 A CN 200910242891A CN 101754059 A CN101754059 A CN 101754059A
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Abstract
The invention discloses a secondary label forwarding method hierarchically driven by multiple services in an optical packet network, which comprises a method for adding different secondary labels in edge nodes according to service characteristics, a method for looking up different forwarding tables in a core node to carry out label forwarding, and a forward mode of optimum approaching match. Through the method, network resources can be rationally allocated according to the QOS requirements of the services; and the connection-oriented and non-connection-oriented self-adaptive routing modes are adopted. The services with high QOS grade are transmitted by adopting the connection-oriented mode (source routing), and the services with low QOS grade and strong burstiness are transmitted by adopting the non-connection-oriented mode (Per-Hop routing); and the secondary label is forwarded by the mode of optimum approaching match so as to greatly improve the adaptive efficiencies of the network resources and the service requirements.
Description
Technical field
The present invention relates to communication technical field, relate in particular to the secondary label forwarding method that the multi-service classification drives in a kind of optical packet network.This method is mainly used in the packetizing optical-fiber network, is a kind of pass-through mode that improves resource utilization, refers more particularly to the optical communication technique field.
Background technology
Main transmission network all is that optical-fiber network is realized at present, but the most of realization of existing optical-fiber network all is the optical link of fixing, before business arrives, just distribute fixing wavelength and bandwidth resources, can't carry out dynamic resource allocation according to the fluctuation of Network and the real-time change of network topology.For the development and the demands of applications of high speed networking now that satisfy data service, optical-fiber network should be able to carry out dynamic Wavelength Assignment according to business demand, reflects network topology and professional demand in real time.
Information communication network of future generation mainly comprises two parts: the edge IP operation network that has the ultra broadband transfer capability, the transparent core light of signal is transmitted the network platform and can couple together various customer service signals and product platform.
In order well to merge these two kinds of networks, the MPLS technology is wherein a kind of technology option that is widely used and enjoys favor.Because traditional Internet is used as a kind of subnet to the protocol layer below the IP layer, and lower floor's transmission network is seldom considered IP layer characteristic, this makes that transmitting net is difficult to bearer IP service safely and reliably.MPLS realizes searching fast exchange with the short label that the IP header is mapped to packets headers.The MPLS label slows down the coupling fully that packet forward is based on the fixed length short label, rather than need move the longest matching algorithm as router, thereby simplifies repeating process greatly, has improved forwarding rate.MPLS can ensure that this is to satisfy the demand of user to data service reliability and fail safe greatly for QOS is provided towards connectionless IP operation.
MPLS is introduced optical-fiber network, can make optical-fiber network have the ability of automatic control and intelligence exchange, realize the seamless transmission of IP operation on optical-fiber network.For MPLS routing protocol and signaling protocol and optical switch is suitable, construct intelligent lambda router/optical switch, just must do corresponding expansion and revise traditional mpls protocol.
Traditional MPLS is most of business its distributing labels, and sets up LSP.But MPLS is not placed on all business two layers of forwarding, and it has still kept three layers of forwarding capability to partial service, mainly for following three kinds of reasons:
With regard to autgmentability, the accuracy that adopts the 3rd layer of forwarding is than label forwarding height.
With regard to fail safe, adopt the 3rd layer of forwarding to allow to use fire compartment wall that grouping is filtered.
With regard to compatible, adopt the 3rd layer of forwarding can continue to use traditional router to transmit, the compatibility to existing equipment is provided.
But with regard to optical-fiber network, three layers of routing function just do not have necessity of existence.Owing to introduced control plane, all routing and topology informations are all assigned by control plane, and packet there is no need away the IP route.So will not keep the function of three layers of route in optical packet network, these functions will be carried out at control plane, and all business will be transmitted at two layers.Two layers of forwarding of multi-service have following advantage:
The first, the network flattening can provide simply, packet forward ability fast, and what its main advantage derived from that its uses is the short label of regular length.Exchange when a node adopts second layer label, and label just can directly be searched as index with the segment mark label and transmit by after correct the distribution.
The second, hardware device is simpler, has reduced the construction cost of network.It is easier than making the 3rd layer of forwarding hardware to make the label switching hardware, because the label function of exchange is comparatively simple.
Owing to have a large amount of burst services in the network, if be each business distributing labels and to set up LSP be unpractical all.At first be not have so much label resources, tag length is short more in optical-fiber network, and it is easy more to deal with; Secondly, for sudden very strong business is set up the waste greatly that LSP can cause Internet resources.
Summary of the invention
The invention provides the mechanism that realizes two layers of forwarding of multi-service in a kind of optical packet network, be intended to improve the bearing capacity of optical packet network IP operation.The original label mechanism of this mechanism good compatible MPLS of energy, and can transmit according to professional QOS, can adopt different transmission meanss according to the burst characteristic of business simultaneously, improve utilization rate of network resource.
The invention provides the method that realizes two layers of forwarding of multi-service in a kind of optical packet network:
1. described mechanism is added the tag processes process at fringe node and is characterised in that comprise: A. is the service selection one-level label that do not tag; B. judge whether the business that do not tag is QOS strict guarantee business, if, carry out step e, otherwise, carry out step C; C. judge whether the business of not tagging is sudden very strong business, if, carry out step D, otherwise, carry out step F; D. distribute a special label, and produce the secondary label according to the self-characteristic of packet; E. distribute a common one-level label, carry out resource reservation when setting up LSP, distribute an inoperative secondary label for it again; F. distribute a common one-level label, carry out resource reservation when setting up LSP, distribute an inoperative secondary label for it again.
2. described mechanism is added the tag processes process at core node and is characterised in that, comprising:
A. extract the one-level label in the packet packet header;
B. judge whether this one-level label is special tag, if, carry out step C, otherwise, carry out step e;
C. extract the secondary label in the packet packet header;
D. secondary label and Label Forwarding Information Base are carried out fuzzy matching, the output port of specified data bag;
E. one-level label and Label Forwarding Information Base are accurately mated the output port of specified data bag.
The present invention is mainly used in the packetizing optical-fiber network, and label adopts form in the band, and label does not need additionally to take a channel, thereby has saved Internet resources.In the mechanism of this invention, can adopt towards being connected with non-with burst characteristic according to the QOS demand of business towards being connected adaptive routing mechanism.When the QOS of business grade is high, adopt towards connected mode,, and set up LSP, carry out resource reservation simultaneously for it for it distributes the one-level label; When the QOS of business grade is low when but business continuance is strong, is that it distributes one-level label, and sets up LSP for it, still do not carry out resource reservation; When professional QOS grade is low and sudden when very strong, be that it distributes a special one-level label, its effect is to enable the secondary label.When core node is transmitted, special one-level label will inform that the information of its forwarding of core node is in the secondary label.The secondary label mainly is the information that two layers of forwarding are provided for the low and sudden very strong business of QOS grade.
For traffic performance and optical network resource is rationally adaptive, the one-level label will be continued to use the mode that shows route among the MPLS, packet had been its automatic link setup before entering core network, also carried out resource reservation for the business that the QOS grade is high, make its complete face to connection, thereby guarantee professional QOS demand.Because the secondary label mainly is at the low and sudden very strong business of QOS grade,, it will cause a large amount of wastings of resources for distributing LSP.So the secondary label will adopt the mode of hop-by-hop route to carry out label forwarding.At core node, the complete matching way that the one-level label is still continued to use among the MPLS carries out label forwarding, and the secondary label adopts fuzzy matching, promptly adopts the optimum Match mode to carry out label forwarding.
The mechanism that this invention proposes can realize the quick forwarding of packet, and can when transport service, can satisfy professional transmission demand according to professional self-characteristic allocation of network resources reasonably, can improve utilization rate of network resource again.
Description of drawings
Fig. 1 adds the realization flow figure of secondary label at fringe node for the present invention.
Fig. 2 searches the realization flow figure that label carries out label forwarding for the present invention at core node.
Fig. 3 is the network topological diagram of first, second and third embodiment.
Fig. 4 is first embodiment of the invention is added the secondary label at fringe node a process schematic diagram
Fig. 5 for first embodiment of the invention at the core node repeating process schematic diagram of tabling look-up.
Fig. 6 is second embodiment of the invention is added the secondary label at fringe node a process schematic diagram
Fig. 7 for second embodiment of the invention at the core node repeating process schematic diagram of tabling look-up.
Fig. 8 is third embodiment of the invention is added the secondary label at fringe node a process schematic diagram
Fig. 9 for third embodiment of the invention at the core node repeating process schematic diagram of tabling look-up.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Embodiment 1:
The network topological diagram that present embodiment is based on as shown in Figure 3 describes.Mainly illustrate for the high business of QOS grade, be its process of adding the secondary label and tabling look-up and transmitting at core node at fringe node.
When the high professional A of QOS grade arrived fringe node, fringe node at first perception went out professional QOS grade.When knowing is that high-priority service is when arriving, just for it sends the link setup request, as shown in Figure 4.The link setup request is sent from fringe node RE1, through core node RC1, again by behind the core node RC4, arrives purpose fringe node RE4.RE4 carries out the downstream tag distribution protocol, builds up LSP when label L1 is distributed to source node RE1, and carries out resource reservation, guarantees to have on the LSP certain bandwidth for professional A transmission.Suppose that label L1 is b.In order to make label form unified specification, be convenient to node and carry out tag processes, to distributing an inoperative secondary label to it again behind the intact one-level label of packet delivery, this secondary label does not comprise the information of any packet.Packet added just can enter core network behind the secondary label and transmit.
When packet arrived core node RC1, core node extracted the one-level label, checks whether it is special tag, as shown in Figure 5.Label b is common one-level label, knows that this packet should go out from 2 ports after checking Label Forwarding Information Base, and is that it distributes an outgoing label c.Handling the back just can forward packet from 2 ports.Packet carries out the identical forwarding work of searching with RE 1 when arriving core node RE4.Owing to when setting up LSP, carried out resource reservation, so the problem of data packet collisions can not take place, effectively guaranteed the transmission of the professional high QOS grade of service in the whole piece link, final data is bundled into merit and arrives destination node RE4.
Embodiment 2:
The network topological diagram that present embodiment is based on as shown in Figure 3 describes.But main explanation is its process of adding the secondary label and tabling look-up and transmitting at core node for the big sudden not strong business of the not high flow of QOS grade at fringe node.
When the professional arrival of this kind fringe node, fringe node at first perception goes out professional QOS grade.When knowing that its professional QOS grade is not high, its business of perception is sudden again, when knowing that it is the professional B of big flow, just for it sends the link setup request, as shown in Figure 6.The link setup request is sent from fringe node RE1, through core node RC1, again by behind the core node RC4, arrives purpose fringe node RE4.RE4 carries out the downstream tag distribution protocol, builds up LSP when label L1 is distributed to source node RE1.Because this professional QOS grade is not high, there is no need to it carries out resource reservation, so being with the difference of above-mentioned case that packet might produce in the process of transmitting, it conflicts.Suppose that label L1 is b.In order to make label form unified specification, be convenient to node and carry out tag processes, to distributing an inoperative secondary label to it again behind the intact one-level label of packet delivery, this secondary label does not comprise the information of any packet.Packet added just can enter core network behind the secondary label and transmit.
When packet arrived core node RC1, core node extracted the one-level label, checks whether it is special tag (being the label of address information), as shown in Figure 7.Label b is common one-level label, knows that this packet should go out from 2 ports after checking Label Forwarding Information Base, and is that it distributes an outgoing label c.Handling the back just can forward packet from 2 ports.Packet carries out the identical forwarding work of searching with RE1 when arriving core node RE4.The final data bag arrives destination node RE4.
Embodiment 3:
The network topological diagram that present embodiment is based on as shown in Figure 3 describes.Not high and sudden very strong business mainly is described for the QOS grade, is its process of adding the secondary label and tabling look-up and transmitting at core node at fringe node.
When the professional arrival of this kind fringe node, fringe node at first perception goes out professional QOS grade.When knowing that its professional QOS grade is not high, its business of perception is sudden again, when knowing that it is sudden very strong professional C, fringe node adds an one-level label that carries destination address information according to the self-contained destination address of packet for it, add the secondary label of representing the COS grade according to the business demand of packet self for it again, as shown in Figure 8.Added and entered core network behind the secondary label and transmit.
Each node in the core network all can be safeguarded two tables, and one is the one-level Label Forwarding Information Base, and main contents include label, port numbers, outgoing label.When going into label when being address information, the COS information that comprises data service in the secondary label is described, just extract the secondary label this moment, and trigger the secondary Label Forwarding Information Base that is complementary with this address information simultaneously.As shown in Figure 9, suppose that address information is RE4 in the secondary label, then trigger the secondary of RE4 correspondence and transmit.Comprise during this secondary is transmitted all outbound ports that can arrive the RE4 destination node with and the COS grade of corresponding transmission link.The big more COS of the showing grade of value of COS was high more during secondary was transmitted.Suppose that now the COS grade is 2 in the secondary label.As shown in Figure 9, the port that can lead to RE4 has 3, and the COS grade of port one respective links is 1, and the COS grade of port 2 respective links is 4, the COS grade of port 3 respective links is 2, as long as the COS value of port numbers just can satisfy professional transmission demand more than or equal to professional COS requirements.So can satisfy the ports having 2 and the port 3 of professional COS demand.What the secondary label adopted is best near matching method, promptly finds out the link of a professional COS value the most approaching from the transmission path that can satisfy professional COS demand.As shown in Figure 9, port 2 and port 3 can both satisfy professional COS demand, but the COS requirements of the more approaching business of COS value of port 3, so packet will go out from port 3.So just cannot leave the higher business of COS demand for by the link that the COS value is high, help the reasonable resources efficient allocation.Carry out the identical processing with RC1 when packet arrives RC3, the final data bag will arrive destination node RE4.
Claims (10)
1. the secondary label forwarding method that the multi-service classification drives in the optical packet network adds the tag processes process at fringe node and is characterised in that, comprising:
A. be the service selection one-level label that do not tag;
B. judge whether the business that do not tag is QOS strict guarantee business, if, carry out step e, otherwise, carry out step C;
C. judge whether the business of not tagging is sudden very strong business, if, carry out step D, otherwise, carry out step F;
D. distribute a special label, and produce the secondary label according to the self-characteristic of packet; E. distribute a common one-level label, carry out resource reservation when setting up LSP, distribute an inoperative secondary label for it again;
F. distribute a common one-level label, carry out resource reservation when setting up LSP, distribute an inoperative secondary label for it again.
According to claim 1 mechanism, it is characterized in that, one-level label in the described method and secondary label all be regular length.The one-level label is still continued to use the label mechanism of MPLS, and the one-level label is brief, as to have a regular length identifier with local significance, is used for discerning forwarding equivalence class.The label form of secondary label is identical with the one-level label, also is a brief identifier with regular length.
3. the method for claim 1 is characterized in that, the common one-level label among the described step D is traditional MPLS label.The empty label of a secondary that distributes afterwards, this label does not play the sign effect, mainly is in order to make all wrap added tag length specification unanimity, to be convenient to label forwarding and to handle.
4. the method for claim 1, it is characterized in that, special tag in the described step e, its specification is identical with common one-level label, and its effect is in order to enable the secondary label, when tag processes, in case the one-level label is a special tag, the secondary label that then shows this label contains relevant information, need handle the secondary label, extracts relevant information and carries out the forwarding work of packet.
5. the method for claim 1 is characterized in that, the secondary label in the described step e is the header information by the analyzing IP packet, with relevant information as label information.The secondary label is based on the generation of packet self characteristics, rather than need be based on full mesh topology or professional control flows as the one-level label.
6. method as claimed in claim 5 is characterized in that, the information of secondary label can be in IP destination-address, IP destination address prefix, the IP purpose network address prefix etc.As long as the secondary label is the transmission demand of identification data newspaper effectively.
7. the method for claim 1 is characterized in that, the one-level label in the described method adopts and shows that routing mode carries out, and promptly the distribution of one-level label and assignment are carried out according to the LDP of MPLS.The secondary label is the packet self-characteristic because it does not carry the whole network information, so adopt the mode of hop-by-hop route more reasonable.
8. the secondary label forwarding method that the multi-service classification drives in the optical packet network adds the tag processes process at core node and is characterised in that, comprising:
A. extract the one-level label in the packet packet header;
B. judge whether this one-level label is special tag, if, carry out step C, otherwise, carry out step e;
C. extract the secondary label in the packet packet header;
D. secondary label and Label Forwarding Information Base are carried out the best near coupling, the output port of specified data bag;
E. one-level label and Label Forwarding Information Base are accurately mated the output port of specified data bag.
9. method as claimed in claim 8 is characterized in that, the fuzzy matching in the described method is meant that selecting one had both satisfied packet characteristic demand, can not waste the path of resource again.
10. the present invention's business high to grade, and the connection-oriented mode of the professional employing of QOS strict guarantee is transmitted, then adopt non-connection-oriented mode to transmit for junior business, thus should mechanism not only seating surface to connecting but also supporting non-connection-oriented transmission.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103491001A (en) * | 2012-06-11 | 2014-01-01 | 中兴通讯股份有限公司 | Method and device for hierarchical label switching path (LSP) processing and gateway node |
| CN104054305A (en) * | 2012-12-26 | 2014-09-17 | 华为技术有限公司 | IP data package transmitting method and label switching router |
| CN104601238A (en) * | 2012-04-18 | 2015-05-06 | 烽火通信科技股份有限公司 | Small smart light wiring device |
| CN110166358A (en) * | 2019-04-29 | 2019-08-23 | 广州大学 | Programmable data plane method for routing, system, readable storage medium storing program for executing and equipment |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1283066C (en) * | 2003-07-15 | 2006-11-01 | 华为技术有限公司 | A multi-level label forwarding method with label expansion |
| CN101005330B (en) * | 2006-12-30 | 2010-07-21 | 电子科技大学 | Light grouping exchange method based on serial arrangement light orthogonal code label |
| CN101494511B (en) * | 2009-03-17 | 2011-11-02 | 烽火通信科技股份有限公司 | Method for distributing T-MPLS looped network label |
-
2009
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104601238A (en) * | 2012-04-18 | 2015-05-06 | 烽火通信科技股份有限公司 | Small smart light wiring device |
| CN104601238B (en) * | 2012-04-18 | 2017-03-15 | 烽火通信科技股份有限公司 | Small intelligent optical distribution equipment |
| CN103491001A (en) * | 2012-06-11 | 2014-01-01 | 中兴通讯股份有限公司 | Method and device for hierarchical label switching path (LSP) processing and gateway node |
| CN103491001B (en) * | 2012-06-11 | 2018-03-13 | 中兴通讯股份有限公司 | Layered LSP LSP processing methods, device and gateway node |
| CN104054305A (en) * | 2012-12-26 | 2014-09-17 | 华为技术有限公司 | IP data package transmitting method and label switching router |
| CN110166358A (en) * | 2019-04-29 | 2019-08-23 | 广州大学 | Programmable data plane method for routing, system, readable storage medium storing program for executing and equipment |
| CN110166358B (en) * | 2019-04-29 | 2021-09-03 | 广州大学 | Programmable data plane routing method, system, readable storage medium and device |
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