CN104065576A - Label switching method in dynamic MPLS satellite network - Google Patents
Label switching method in dynamic MPLS satellite network Download PDFInfo
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Abstract
The invention discloses a label switching method in a dynamic MPLS satellite network. The label switching method includes the steps that first, peer discovery is performed in a label distribution protocol process and concretely achieved through real-time update of Hello message neighbors; second, a session of a label distribution protocol is established and maintained; third, a label switching path is established and maintained. Through the label switching method in the MPLS satellite network, the problem that data cannot be forwarded because of satellite link disconnection resulting from changes of the link environment and the network topology structure of the satellite communication network on the MPLS path can be effectively solved, and the label switching method can be well applicable to the satellite network environment. The label switching method is easy to implement, good in effect and wide in application prospect.
Description
Technical field
The invention belongs to satellite multiprotocol label switching (mpls) technical field, particularly the label exchanging method in dynamic MPLS network on a kind of satellite.
Background technology
Along with the development of communication technology of satellite, satellite is developed into and is had the ability that on star, exchange is processed by original transparent forwarding.Current spaceborne exchange hierarchy mainly contains spaceborne ATM exchange and spaceborne IP exchange etc.Spaceborne ATM exchanged form protocol overhead is large, expandability is not strong, signaling is complicated, and can not realize seamless link with ground IP network.Spaceborne IP exchanges the forwarding strategy based on hop-by-hop, each jumping all will be carried out the longest prefix match of IP and table look-up, cause on star forwarding rate slow, and simple IP exchange QoS ensures to lack in ability, ATM is different from asynchronous transmission: MPLS technology can not form separately network architecture, must rely on IP agreement to use.The development of reference ground network exchange technology, multiple label switching technology be for make link layer in ICP/IP protocol architecture with network layer combine and propose, make can be mapped as the operation to label for the operation of whole complexity of network layer, effectively avoid the interaction problems of IP agreement and network node.In recent years MPLS switching technology is applied in the research in satellite communication network by domestic expansion, to meet the demand of satellite communication development.
Compare and ground communication environment, satellite communication environment has distinguishing feature:
(1) there is special topological time variation.Due to satellite node laws of motion, therefore the variation of network topology has periodically and predictability, and this feature can be used to optimize the route calculating of LSP in satellite MPLS network or initialization and the maintenance strategy of label;
(2) there is very large propagation delay time characteristic.Because satellite node is distributed in very large space, internodal propagation delay time is more much bigger than the internodal propagation delay time of ground network, becomes the major part of delay of communication.This long delay characteristics has all brought new problem for aspects such as the discovery of satellite MPLS Network QoS guarantee, MPLS peer-to-peer and the foundation in maintenance, LDP information exchange and the LSP path based on constraint;
(3) computational resource finiteness on star.Owing to being subject to the restriction of the factor such as energy supply, volume, the computing capability of satellite node is often well below ground node, and this specific character has all proposed new requirement for complexity, protocol complexities and LER, the Distribution Strategy of LSR etc. of the various algorithms of satellite MPLS.
Due to above-mentioned satellite communication environment, the challenge that the application of satellite communication network faces has:
(1) variable, long delay link.The sensitivity difference of different types of applied business to time delay, selecting overall preferably transmission path according to business transmission feature is one of focus of satellite communication network research;
(2) network topology frequent variations.Because the high-speed motion of satellite node causes network topology change, the transmission path of application data flow need to change along with network topology change;
(3) satellite communication network is resource-constrained.Inter satellite link and satellite-ground link finite capacity, bandwidth is lower, and the contradiction that how solving satellite communication network scarcity of resources and satellite application business demand increases is a direction of the research of satellite communication from now on;
(4) heterogeneous network interconnection.Heterogeneous network interconnection problems is a great problem of satellite communication always, and multiprotocol label switching (mpls) technology can adapt to different data link layers, for interconnection between heterogeneous network provides possibility.
Causing agreements a lot of on ground to directly apply on satellite just because of these differences of satellite network and terrestrial network there will be various unpredictalbe problems, comprises as MPLS.Using in the network of MPLS technology, need to be by the Business Stream polymerization of same alike result, adopt unified forwarding equivalence class FEC(Forwarding Equivalence Class) mark, and set up feasible path for convergence service stream.When applied business enters MPLS network domains edge, edge router ranges FEC according to the IP header message of business datum message by data message, is FEC search label forwarding path LSP(Label Switch Path simultaneously).When business data flow enters after the middle forwarding router of MPLS network domains, middle forwarding router forwards data message according to label, and without complicated IP routing forwarding, has improved forward efficiency.Along with the development of satellite network technology, how in satellite network, realizing MPLS technology will become a new research direction of satellite communication network.
At present, the research of MPLS technology in satellite communication network has obtained certain progress:
(1) satellite MPLS networking plan, i.e. the division of mpls domain, general employing ground station or applied low-orbit satellite are as the edge router of MPLS network at present, and geosynchronous satellite is as intermediate router;
(2) use for reference ground Internet network, under ICP/IP protocol system, the satellite communication network based on MPLS is carried out to related application research;
(3) route of satellite application QoS of survice under MPLS/IP framework, satellite MPLS network routing protocol research based on genetic algorithm that the satellite MPLS network key technical research that the people such as the people such as such as Karapantazis have proposed the routing plan of the QoS in low-orbit satellite LEO constellation, Zhai Lijun propose and Yuan Tian propose etc.;
(4) framework based on the traffic engineering of satellite communication network under MPLS pattern;
(5) the label check method in satellite MPLS network.
Current the research of MPLS satellite network is mainly concentrated on to relatively static GEO backbone network,, for chain environment, the network topology structure Variation Features of satellite communication network, do not consider the label distribution method in dynamic satellite network.
MPLS is a kind of by the switching technology of layer 3 IP and the 2nd layer of exchange, its core is exactly to classifying, be that different labels is stamped in grouping according to different classifications, set up switching path, only on the switching path establishing in advance, transmit subsequently grouping according to label.Realize MPLS and provide the key issue of various senior expanded functions how to be just packet classification, how to set up and safeguard label switched path, these are all solved by tag distribution protocol.Using in the network of MPLS technology, need to be by the Business Stream polymerization of same alike result, adopt unified forwarding equivalence class FEC mark, and set up feasible path for convergence service stream.When applied business enters MPLS network domains edge, edge router ranges FEC according to the IP header message of business datum message by data message, is FEC search label forwarding path LSP simultaneously.When business data flow enters after the middle forwarding router of MPLS network domains, middle forwarding router forwards data message according to label, and without complicated IP routing forwarding, has improved forward efficiency.Along with the development of satellite network technology, how in satellite network, realizing MPLS technology will become a new research direction of satellite communication network.
In order to use label exchange processing forward data message in MPLS network domains, edge label switch router node on forward-path must be set up down hop converting route item (NHLFE), wherein comprise the required label information of forwarding data packets, interface message and IP address information, this process becomes label distribution.
In MPLS standard document, be not defined in the signaling protocol of label distribution between edge label switch router node, in MPLS network, there is various protocols to realize the distribution of label, as: Border Gateway Protocol (BGP), label distribution protocol (LDP, Label Distribution Protocol) and resource reservation protocol (rsvp) etc.Border Gateway Protocol and label distribution protocol have adopted the data message of Transmission Control Protocol transmission distribution label information, can ensure the reliability of label distribution.
Tag distribution protocol LDP is the main agreement of the one in MPLS system.In MPLS network, two edge label switch router nodes must be used on the label between them or by their converting flows reaches an agreement.Tag distribution protocol has defined batch processing and message, can notify the binding of another edge label switch router node label that it has formed by their edge label switch router nodes.By the direct mapping between network layer routing iinformation and data link layer switching path, edge label switch router node can be set up label switched path by network with tag distribution protocol.When starting, tag distribution protocol first finds tag distribution protocol peer-entities, then trigger the initialization of label distribution protocol conversation, between 2 peer-entities, set up afterwards label distribution protocol conversation and use various mechanism to safeguard it, according to the routing table on each edge label switch router node in mpls domain with about the configuration of tag distribution protocol, triggered mark distribution procedure, form label switched path, and these paths are managed and safeguarded.By using tag distribution protocol, edge label switch router node just can be different specific packet map to corresponding label switched path, the routing iinformation of network layer is mapped directly on the switching path of data link layer, thereby realized two, three layers combine closely.
Traditional tag distribution protocol is the core control protocol of MPLS, does not consider the feature of satellite network change in topology.Due to the difference of satellite network and terrestrial network, be necessary the feature in conjunction with satellite network, tag distribution protocol is carried out to adaptation, new label distribution method is proposed.
Summary of the invention
The object of this invention is to provide the label distribution method in a kind of satellite MPLS network.The present invention, by using for reference the label distribution method of ground MPLS, carries out adaptation to it, thereby realizes the label distribution of satellite MPLS network.
The technical solution adopted in the present invention is: the label exchanging method in a kind of dynamic MPLS satellite network, it is characterized in that, and comprise the following steps:
Step 1: the peer-to-peer discovery in tag distribution protocol process, its specific implementation is to carry out peer-to-peer discovery by the Hello message between the peer-to-peer of real-time update tag distribution protocol;
Step 2: set up and the session of safeguarding tag distribution protocol;
Step 3: set up and safeguard label switched path, its specific implementation comprises following sub-step:
Step 3.1: set up real-time network topology, search for correct label switched path, to be data link layer select the link linking relationship of bottom according to strong waveguide frequency signal to its specific implementation, and linking relationship builds network topology structure accordingly;
Step 3.2: set up label switched path in MPLS network;
Step 3.3: the heavy-route of label switched path.
As preferably, the real-time update of Hello message neighbours described in step 1, its specific implementation process is in the time that the heavy-route initiation label of label switched path is distributed again, first retrieve the neighbor information whether Hello message in information of neighbor nodes comprises down hop, if comprise, directly to neighbor request label; If do not comprise, find process discovering neighbor thereby start MPLS neighbours, upgrade hello neighbor information, be updated successfully backward neighbor request label.
As preferably, the foundation described in step 2 and the session of safeguarding tag distribution protocol, its specific implementation comprises following sub-step:
Step 2.1: first set up TCP and connect between the peer-to-peer of tag distribution protocol;
Step 2.2: the then session parameter between the peer-to-peer of negotiating tags distribution protocol.
As preferably, the network topology that the foundation described in step 3.1 is real-time, searches for correct label switched path, and its specific implementation comprises following sub-step:
Step 3.1.1: first determine the link of the all-links in one-period, determine needed label switched path according to current link;
Step 3.1.2: then according to link layer topology information, revise the weight of label forwarding path in different time sections, change the rights of using of label switched path, make it use different label switched paths in different network topology structures.
As preferably, the network topology that foundation described in step 3.1 is real-time, in the tag distribution protocol process model of original ground, having added topological renewal interrupts, this interrupt type is long-range interruption, the effect that topology is upgraded interrupt response function is: in the time that the process of the tag distribution protocol of MPLS is received the linking relationship that link layer process sends, upgrade current network topology; The specific implementation of upgrading current network topology comprises following sub-step:
Steps A: set up and initialization adjacency list;
Step B: response topology is upgraded and interrupted, and enters interrupt response function;
Step C: judge whether two end points in link information are present in the summit table of adjacency list;
If not, this end points is added in the summit table of adjacency list;
If so, order is carried out following step D;
Step D: judge that whether the Link State in link information is effective, upgrade the limit table information in adjacency list.
As preferably, the limit table information in the renewal adjacency list described in step 3.1, its specific implementation process is:
If the Link State in link information is effective, judge in the table of limit whether have this terminal point information; If so, not be used in the table of limit and insert this end points; If not, this end points is inserted in the table of limit;
If the Link State in link information is invalid, judge in the table of limit whether have this terminal point information; If so, this end node is deleted from the table of limit; If not, in the table of limit, there is not this end points, do not carry out deletion action.
As preferably, the heavy-route of the label switched path described in step 3.3, its specific implementation comprises following sub-step:
Step 3.3.1: build satellite MPLS network needed label switched path in different time sections;
Step 3.3.2: the weight of all label switched path of initialization;
Step 3.3.3: traversal global variable, has judged whether that label distribution path status changes;
Step 3.3.4: the weight in the label distribution path of amendment state variation.
Utilize the label exchanging method in satellite MPLS network provided by the invention, disconnect because chain environment, the network topology structure of satellite communication network change the satellite link causing the problem that data cannot be forwarded thereby can effectively solve on MPLS label switched path, can be good at being applicable to satellite network environment.Realization of the present invention is simple, respond well, is with a wide range of applications.
Brief description of the drawings
Accompanying drawing 1: the information updating handling process of the Hello message of the embodiment of the present invention;
Accompanying drawing 2: the flow chart of the renewal current network topology of the embodiment of the present invention;
Accompanying drawing 3: the handling process of the label switched path heavy-route of the embodiment of the present invention;
Accompanying drawing 4: the dynamic MPLS satellite network simulation scene schematic diagram of the embodiment of the present invention;
Accompanying drawing 5: the tag path inbound traffics counting rate figure of the embodiment of the present invention;
Accompanying drawing 6: the tag path outflow counting rate figure of the embodiment of the present invention.
Embodiment
Understand and enforcement the present invention for the ease of those of ordinary skill in the art, below in conjunction with drawings and Examples, the present invention is described in further detail, should be appreciated that exemplifying embodiment described herein, only for description and interpretation the present invention, is not intended to limit the present invention.
The technical solution adopted in the present invention is: the label exchanging method in a kind of dynamic MPLS satellite network, comprises the following steps:
Step 1: the peer-to-peer discovery in tag distribution protocol process, its specific implementation is to carry out peer-to-peer discovery by Hello message neighbours' real-time update;
In label distribution process, peer-to-peer refers to two edge label switch router nodes that carry out each other switch label/FEC mapping relations with tag distribution protocol.Two label distribution peer-to-peers can obtain the other side's label mapping message simultaneously by a label distribution protocol conversation, label distribution is two-way.
Wish that the edge label switch router node of setting up session can periodically send Hello message to neighboring edge LSR node, notices the existence of oneself.By Hello message, edge label switch router node can be found the edge label switch router node neighbours around it automatically, and sets up Hello syntople with it.Ground MPLS network topology structure is relatively fixing, the hello neighbor node of setting up is relatively fixing, and constantly move for the low-orbit satellite node in satellite MPLS network, cause network topology in continuous variation, make the Hello message of broadcasting between the peer-to-peer of tag distribution protocol need constantly to upgrade and change, affected the break-make of built vertical session.Therefore, need to, to the Hello information between the peer-to-peer of maintenance, renewal tag distribution protocol, re-establish session to the Hello message of upgrading.
Real-time update by Hello message neighbours is carried out peer-to-peer discovery, and it focuses on node and when initiates neighbours and find the more Hello information of new neighbor.We are the mode from interruption by demand property, be that change in topology is while causing tag path heavy-route, judge in the Hello message of neighbor node and whether have complete next-hop node information, if do not exist, start MPLS and find managing process, rediscover neighbours, upgrade the information of Hello message, again and between neighbours, set up session.Its advantage is only in the time of this neighbor node of needs, upgrades neighbor node, sets up session, avoids because the network performance that hello message causes declines.In the present invention, adopt demand property from the Hello message of interrupting upgrading neighbor information.
Ask for an interview Fig. 1, for the information updating handling process of the Hello message of the embodiment of the present invention, in the time that the heavy-route initiation label of label switched path is distributed again, first retrieve the neighbor information whether Hello message in information of neighbor nodes comprises down hop, if comprise, directly to neighbor request label; If do not comprise, find process discovering neighbor thereby start MPLS neighbours, upgrade hello neighbor information, be updated successfully backward neighbor request label.
Step 2: set up and the session of safeguarding tag distribution protocol; Its specific implementation comprises following sub-step:
Step 2.1: first set up TCP and connect between the peer-to-peer of tag distribution protocol;
Step 2.2: the then session parameter between the peer-to-peer of negotiating tags distribution protocol.
After the peer-to-peer of tag distribution protocol has been found, on local node, can set up the Hello message of a neighbor node list, for preserving the session information between the peer-to-peer of tag distribution protocol.Thereby the peer-to-peer of local node and tag distribution protocol is set up session.
Step 3: set up and safeguard label switched path, its specific implementation comprises following sub-step:
(1) set up link layer topology, the feasible path in search label distribution path;
In satellite network, data link layer is selected the link linking relationship of bottom according to strong waveguide frequency signal, the reaction that this linking relationship is real topology of networks.The present invention has added topological renewal and has interrupted in the tag distribution protocol process model of original ground, this interrupt type is long-range interruption, the effect that topology is upgraded interrupt response function is: in the time that the process of the tag distribution protocol of MPLS is received the linking relationship that link layer process sends, upgrade current network topology.Upgrade the flow process of current network topology as shown in Figure 2, its step is as follows:
1. set up and initialization adjacency list.The network topological information of the overall situation is organized by the mode of figure, and the data structure of employing is adjacency list, this adjacency list of the nodes sharing in global network;
2. response topology is upgraded and is interrupted, and enters interrupt response function;
3. judge whether two end points in link information are present in the summit table of adjacency list; In the summit table of adjacency list, comprise all summits in current network topology, and to for once record of this summit.Therefore, if comprised certain end points in current renewal link information in the summit of adjacency list table, add as needed during this end points shows to the limit, otherwise, should add during this end points shows to the limit;
4. according to the link-state information in link information, upgrade the limit table information in adjacency list; In link information, having indicated current Link State, is to indicate that this link is in connected state at 0 o'clock, is to indicate that this link is in off-state at 1 o'clock.When link is communicated with, need to revise the limit table of corresponding vertex in adjacency list; When link disconnects, need in adjacency list, in showing, delete this end points in the limit of corresponding vertex.
(2) in MPLS network, set up label switched path;
In MPLS network, set up the path of label exchange, when after certain node or certain link failure in label switched path, to cause label switched path to lose efficacy, label switched path re-establishes afterwards, if can not set up, label switched path is set up unsuccessfully, no longer sets up this strip label switching path.
(3) heavy-route of label switched path;
The handling process of the heavy-route of label switched path as shown in Figure 3, the reason that causes Dynamic Label Switched Path heavy-route in the process of the tag distribution protocol of MPLS is that the relative position between low-orbit satellite and geosynchronous satellite changes, disconnect with the link of the geosynchronous satellite of current use, and be linked on an other geosynchronous satellite, cause Dynamic Label Switched Path to need to re-route, reorganize label distribution path.The step of the heavy-route of label switched path is as follows:
1. judge that this link changes the linking status that whether has affected the label switched path in network; Due to after the motion of satellite causes satellite network topology to change, original linking status changes thereupon, and whether the variation of this link has affected the linking status of label switched path, if do not affect, the link that is current variation is not included in label switched path, without label switched path is carried out to heavy-route; If affected the state of label switched path, need this label switched path to re-route, again distribute label, safeguard label switched path;
2. judge whether present node is the ingress edge LSR node of label switched path; The promoter who sets up label switched path is the ingress edge LSR node of label switched path, therefore the heavy-route of label switched path, reorganizing label switched path must complete on the ingress edge LSR node of label switched path.If present node is the intermediate node of label switched path, the state of must upstream hop-by-hop noticing this label switched path changes, until the ingress edge LSR node of this label switched path;
3. start heavy-route; When the linking status of this label switched path of ingress edge LSR node perceived of label switched path changes, the weight that first this label switched path is set is FAILED, then calls route handoff function and starts to reorganize this label switched path;
4. heavy-route completes, and recovers the weight of this label switched path; When completing the heavy-route process of label switched path, recover the weight of this label switched path, this label switched path can provide the transmission service of Business Stream again.
Below in conjunction with simulation example, using method of the present invention and implementation result are described:
Tag distribution protocol, by sending label request and label mapping message, is noticed the binding relationship of FEC and label, thereby is set up label distribution path between tag distribution protocol peer-to-peer.In satellite MPLS network environment, the routing table information that node utilizes the Routing Protocol of ground universal route to set up is imperfect, relies on routing table information when label distribution path and sets up label routing and build, and causes building label routing failure, and label cannot be asked.Therefore need to set up correct network topological information, and then can search correct label forwarding route, the key of head it off is to set up real-time network topology.In satellite network, data link layer is selected the link linking relationship of bottom according to strong waveguide frequency signal, the reaction that this linking relationship is real topology of networks.
Can within all the period of time, to have with ground station the link of connection in order allowing to the application data services of low-orbit satellite, must to adopt the collaborative work of many strip labels switching path, in different time sections, adopt different label switched paths, the applied business transmission of all the period of time is provided.
This present invention is proposed to following solution:
(1) first determine the link of the all-links in one-period, determine needed label switched path according to current link;
(2) then according to link layer topology information, in different time sections, revise the weight of label forwarding path, change the rights of using of label switched path, make it in different network topology structures, use different label switched paths.
Dynamic Label Switched Path is to organize label switched path by tag distribution protocol, and distribution label distributes Fabric Interface and required next-hop ip address etc. information, all dynamic organizations in network simulation that are set in about label switched path information.Therefore, after label switched path tissue completes, whether can normally distribute label by paying close attention to dynamic labels path, the label switched path whether data traffic can be organized by tag distribution protocol forwards, thereby analyzes the feasibility in satellite MPLS network dynamic labels path.
Ask for an interview Fig. 4, for the dynamic MPLS satellite network simulation scene schematic diagram of the present embodiment, wherein the sever in applied low-orbit satellite leo2_orbit2 is as server, client in the international maritime satellite boats and ships ground3 of ground station is as client, carry out video conference business (Video Conferencing) between the two, geo-synchronous orbit satellite is as repeater satellite, and business provides communication link for this reason.Because relative motion between geo-synchronous orbit satellite, so the link between them exists all the time.
The step of Dynamic Label Switched Path MPLS emulation experiment is as follows:
1. design Dynamic Label Switched Path;
Dynamic Label Switched Path can be according to Network Topology for Real-Time structure organization label switched path, and dynamic labels path leo2_orbit2-geo2-ground_subnet3 sets up a path from low-orbit satellite leo2_orbit2 to the ground3_subnet of ground station.
2. configuration service Parameters in Mathematical Model;
The parameter configuration of application video conference business (Video Conferencing): input and output frame period transmission time interval is that 10s sends frame data second; The size of input and output frame is 86.4kbps.
3. configure MPLS relevant parameter;
The type of service parameter of Dynamic Label Switched Path adaptability revision arrangements, (1) has defined two forwarding equivalence class FEC; (2) stream trunk (Traffic Trunks) is the setting of label switched path attribute, wherein Trunk Details is the setting of convection current trunk details, comprises following some attribute: Maximum Bit Rate, Average Bit Rate, Peak Burst Size, Maximum Burst Size.
Complete after above-mentioned emulation experiment configuration statistics network performance parameter.For the feasibility of checking Dynamic Label Switched Path adaptability revision scheme, the network performance parameter of collecting in this experiment has: (1) Flows, characterize the flow forwarding through LSP, and flow into flow or flow out flow; (2) transmission rate of videoconference traffic amount, receiving velocity and time delay end to end.
Using under the scene of Dynamic Label Switched Path transmission of video meeting flow the statistical chart of Dynamic Label Switched Path inbound traffics and outflow.Wherein blue statistics lines represent by the data traffic of label switched path (ground_router-space_router) in whole simulation process, to only have a strip label switching path.
Ask for an interview accompanying drawing 5 and accompanying drawing 6, the speed that flows into LSP flow is roughly equal with the speed that flows out LSP flow, but recovers after occurring declining on several time points.Its reason is: network topology link changes and causes the label switched path using to lose efficacy, need to take label switched path to re-route, reorganize label switched path, and the loss of data of transmitting in former label switched path, cause the speed that flows out tag changeable path run-off to decline, after label switched path re-establishes, the speed that flows out tag changeable path run-off is recovered thereupon.
Should be understood that, the part that this specification does not elaborate all belongs to prior art.
Should be understood that; the above-mentioned description for preferred embodiment is comparatively detailed; can not therefore think the restriction to scope of patent protection of the present invention; those of ordinary skill in the art is under enlightenment of the present invention; do not departing from the scope situation that the claims in the present invention protect; can also make and replacing or distortion, within all falling into protection scope of the present invention, request protection range of the present invention should be as the criterion with claims.
Claims (7)
1. the label exchanging method in dynamic MPLS satellite network, is characterized in that, comprises the following steps:
Step 1: the peer-to-peer discovery in tag distribution protocol process, its specific implementation is to carry out peer-to-peer discovery by Hello message neighbours' real-time update;
Step 2: set up and the session of safeguarding tag distribution protocol;
Step 3: set up and safeguard label switched path, its specific implementation comprises following sub-step:
Step 3.1: set up the correct label switched path of real-time Network Topology Discovery, to be data link layer select the link linking relationship of bottom according to strong waveguide frequency signal to its specific implementation, and linking relationship builds network topology structure accordingly;
Step 3.2: set up label switched path in MPLS network;
Step 3.3: the heavy-route of label switched path.
2. the label exchanging method in dynamic MPLS satellite network according to claim 1, it is characterized in that: the real-time update of the Hello message neighbours described in step 1, its specific implementation process is in the time that the heavy-route initiation label of label switched path is distributed again, first retrieve the neighbor information whether Hello message in information of neighbor nodes comprises down hop, if comprise, directly to neighbor request label; If do not comprise, find process discovering neighbor thereby start MPLS neighbours, upgrade hello neighbor information, be updated successfully backward neighbor request label.
3. the label exchanging method in dynamic MPLS satellite network according to claim 1, is characterized in that: the foundation described in step 2 and the session of safeguarding tag distribution protocol, and its specific implementation comprises following sub-step:
Step 2.1: first set up TCP and connect between the peer-to-peer of tag distribution protocol;
Step 2.2: the then session parameter between the peer-to-peer of negotiating tags distribution protocol.
4. the label exchanging method in dynamic MPLS satellite network according to claim 1, is characterized in that: the correct label switched path of Network Topology Discovery that the foundation described in step 3.1 is real-time, and its specific implementation comprises following sub-step:
Step 3.1.1: first determine the link of the all-links in one-period, determine needed label switched path according to current link;
Step 3.1.2: then according to link layer topology information, revise the weight of label forwarding path in different time sections, change the rights of using of label switched path, make it use different label switched paths in different network topology structures.
5. the label exchanging method in dynamic MPLS satellite network according to claim 4, it is characterized in that: the network topology that the foundation described in step 3.1 is real-time, in the tag distribution protocol process model of original ground, having added topological renewal interrupts, this interrupt type is long-range interruption, the effect that topology is upgraded interrupt response function is: in the time that the process of the tag distribution protocol of MPLS is received the linking relationship that link layer process sends, upgrade current network topology; The specific implementation of upgrading current network topology comprises following sub-step:
Steps A: set up and initialization adjacency list;
Step B: response topology is upgraded and interrupted, and enters interrupt response function;
Step C: judge whether two end points in link information are present in the summit table of adjacency list;
If not, this end points is added in the summit table of adjacency list;
If so, order is carried out following step D;
Step D: judge that whether the Link State in link information is effective, upgrade the limit table information in adjacency list.
6. the label exchanging method in dynamic MPLS satellite network according to claim 5, is characterized in that: the limit table information in the renewal adjacency list described in step 3.1, and its specific implementation process is:
If the Link State in link information is effective, judge in the table of limit whether have this terminal point information; If so, not be used in the table of limit and insert this end points; If not, this end points is inserted in the table of limit;
If the Link State in link information is invalid, judge in the table of limit whether have this terminal point information; If so, this end node is deleted from the table of limit; If not, in the table of limit, there is not this end points, do not carry out deletion action.
7. the label exchanging method in dynamic MPLS satellite network according to claim 1, is characterized in that: the heavy-route of the label switched path described in step 3.3, and its specific implementation comprises following sub-step:
Step 3.3.1: build satellite MPLS network needed label switched path in different time sections;
Step 3.3.2: the weight of all label switched path of initialization;
Step 3.3.3: traversal global variable, has judged whether that label distribution path status changes;
Step 3.3.4: the weight in the label distribution path of amendment state variation.
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| CN106789404A (en) * | 2016-11-29 | 2017-05-31 | 中国空间技术研究院 | A kind of multimedia satellite communication semi-physical system of internet protocol-based |
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| CN111405654A (en) * | 2020-03-22 | 2020-07-10 | 西安电子科技大学 | Information transmission method between high dynamic wireless nodes |
| CN112565083A (en) * | 2020-11-16 | 2021-03-26 | 天地信息网络研究院(安徽)有限公司 | Multiprotocol label switching method of GEO satellite network |
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| CN107743072B (en) * | 2017-07-04 | 2020-07-17 | 中国电力科学研究院 | Efficient and extensible network simulation scene generation method |
| CN107743072A (en) * | 2017-07-04 | 2018-02-27 | 中国电力科学研究院 | Efficiently expansible network simulation scene generating method |
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| CN110266366B (en) * | 2019-05-23 | 2021-06-04 | 军事科学院系统工程研究院网络信息研究所 | Data transmission cross-layer exchange method of satellite navigation system |
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| CN111405654A (en) * | 2020-03-22 | 2020-07-10 | 西安电子科技大学 | Information transmission method between high dynamic wireless nodes |
| CN112565083A (en) * | 2020-11-16 | 2021-03-26 | 天地信息网络研究院(安徽)有限公司 | Multiprotocol label switching method of GEO satellite network |
| CN112565083B (en) * | 2020-11-16 | 2022-06-17 | 天地信息网络研究院(安徽)有限公司 | Multiprotocol label switching method of GEO satellite network |
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| CN114884557A (en) * | 2022-03-25 | 2022-08-09 | 重庆邮电大学 | Satellite time-sensitive network path selection method based on network calculation |
| CN114884557B (en) * | 2022-03-25 | 2023-07-25 | 重庆邮电大学 | Satellite time sensitive network path selection method based on network algorithm |
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