CN114124189A - Low-rail load-bearing network inter-satellite link rapid protection method based on pressed preset label - Google Patents
Low-rail load-bearing network inter-satellite link rapid protection method based on pressed preset label Download PDFInfo
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- H—ELECTRICITY
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- H04B7/14—Relay systems
- H04B7/15—Active relay systems
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Abstract
The invention discloses a low-rail load-bearing network inter-satellite link rapid protection method based on a pressed preset label, and relates to a route switching technology in the field of satellite networks. In a low earth orbit satellite communication system, a label forwarding table and a preset label are calculated in advance for a link needing to be protected and are injected into a satellite-borne switch, when the satellite-borne switch detects that the link fails, the preset label is pressed into a data packet header, a failed node or link is bypassed according to a path indicated by the preset label, the affected service is transferred to a backup path and is sent to a destination node in the shortest time, then the satellite-borne switch reports link information to a space-based network controller, the controller recalculates the path according to the link information and injects an updated label forwarding table into the corresponding satellite-borne switch, and the satellite-borne switch addresses and forwards the data packet according to the updated label forwarding table, so that the service path is kept smooth, and the communication efficiency is improved.
Description
Technical Field
The invention relates to a low-rail load-bearing network inter-satellite link rapid protection method based on a pressed preset label, and relates to a route switching technology in the field of satellite networks.
Background
The low earth orbit satellite communication system has the advantages of short transmission delay, small link loss, convenience in terminal miniaturization design and the like, so that the research of the low earth orbit satellite networking technology gradually becomes the focus of people. However, in order to realize global seamless service, a low-earth satellite system usually needs hundreds of satellites or even thousands of satellites for networking, the network scale is large, the network topology is highly dynamic, the inter-satellite and earth-satellite links are frequently switched, and once an emergency occurs, the satellite links have the problems of time delay lengthening, high error rate and the like, so that the fast rerouting technology is very important for a low-earth satellite bearer network.
According to the dynamic change of the low-earth orbit satellite network topology structure, the dynamic change is regular and can be circulated, the number of network nodes is not changed greatly generally, and at present, a method of pre-calculating a route in an off-line state is mostly adopted, so that the method has the advantages of simple algorithm and low satellite overhead, and the defects of limited satellite-borne calculation capacity and frequent topology change in a satellite network are overcome. However, this method is not robust, and once a node failure or a link failure occurs in the network, the static routes calculated according to the predicted topology changes are no longer valid. When a network link or a node fails due to an emergency, service transmission interruption is inevitably caused, and the service interruption time depends on the re-convergence speed of the routing protocol.
Disclosure of Invention
In view of the above, the present invention provides a method for quickly protecting inter-satellite links of a low-orbit carrier network based on pressing a preset tag, which can transfer an affected service to a backup path and send the affected service to a destination node in the shortest time when a satellite node in a low-orbit satellite communication system is destroyed or an inter-satellite link fails, thereby keeping the service path smooth, reducing traffic loss and disorder, ensuring reliable transmission of service data, and improving communication efficiency.
The purpose of the invention is realized as follows:
a low-rail bearing network inter-satellite link rapid protection method based on a pressed preset label comprises the following steps:
(1) the space-based network controller calculates a label forwarding table of each satellite node in the low-orbit satellite bearing network and a preset label after each connected link fails according to satellite ephemeris information, and injects the labels into a satellite-borne switch of a corresponding satellite, and the satellite-borne switch searches a label forwarding table for addressing and forwarding through a target label encapsulated in a data packet;
(2) when the satellite-borne switch detects that a link between connected satellites is invalid, pressing a preset label into a data packet header, and then, the satellite-borne switch carries out addressing forwarding on the data packet through the label forwarding table in the step (1) according to the newly pressed preset label;
(3) the satellite-borne switch reports the detection information of the link failure to the space-based network controller;
(4) the space-based network controller performs forwarding table and label centralized calculation again according to the link failure detection information, and injects the calculation result into each satellite-borne switch in the form of a new label forwarding table;
(5) and (4) after the satellite-borne switch receives the new label forwarding table, searching the new label forwarding table according to the target label in the step (1) for forwarding.
Further, in the step (1), the space-based network controller divides the inter-satellite network topology in an orbit period into a plurality of time slices according to the satellite ephemeris information, performs routing calculation for each time slice, and injects the calculation result into the satellite-borne switch of the corresponding satellite in the form of a label forwarding table; in addition, for each time slice, a preset label of a link between connected satellites is calculated for each node, and the calculation result is injected into the satellite-borne switch of the corresponding satellite.
Further, the destination label encapsulated in the data packet in the step (1) is an original destination label before the link fails.
Further, the label forwarding table calculated by the space-based network controller in step (1) includes a corresponding relationship between the destination label and the egress port.
Further, in the step (2), the packaging position of the preset label is positioned before the target label in the step (1); and after the link fails, bypassing the failed link through the preset label.
Further, the new label forwarding table in step (4) updates the egress port information, which guides the data packet to bypass the failed link for addressing and forwarding, compared with the label forwarding table in step (1).
Compared with the prior art, the invention has the following advantages:
by adopting the method, when the satellite node is destroyed or the inter-satellite link fails, the data packet can bypass the destroyed node or the failed link by pressing the preset label, the affected service is transferred to the backup path and is sent to the destination node in the shortest time, and the label forwarding table is updated by the space-based network controller, so that the service path is kept smooth, the flow loss and the disorder are reduced, the reliable transmission of the service data is ensured, and the communication efficiency is improved.
Drawings
FIG. 1 is a flow chart of a method of an embodiment of the present invention;
fig. 2 is a schematic diagram of a fast routing method for a low earth orbit satellite bearer network according to an embodiment of the present invention.
Detailed Description
A low-rail bearing network inter-satellite link rapid protection method based on a pressed preset label comprises the following steps:
(1) the space-based network controller calculates a label forwarding table of each satellite node in the low-orbit satellite bearing network and a preset label after each connected link fails according to satellite ephemeris information, and injects the labels into a satellite-borne switch of a corresponding satellite, and the satellite-borne switch searches a label forwarding table for addressing and forwarding through a target label encapsulated in a data packet;
(2) when the satellite-borne switch detects that a link between connected satellites is invalid, pressing a preset label into a data packet header, and then, the satellite-borne switch carries out addressing forwarding on the data packet through the label forwarding table in the step (1) according to the newly pressed preset label;
(3) the satellite-borne switch reports the detection information of the link failure to the space-based network controller;
(4) the space-based network controller performs forwarding table and label centralized calculation again according to the link failure detection information, and injects the calculation result into each satellite-borne switch in the form of a new label forwarding table;
(5) and (4) after the satellite-borne switch receives the new label forwarding table, searching the new label forwarding table according to the target label in the step (1) for forwarding.
Further, in the step (1), the space-based network controller divides the inter-satellite network topology in an orbit period into a plurality of time slices according to the satellite ephemeris information, performs routing calculation for each time slice, and injects the calculation result into the satellite-borne switch of the corresponding satellite in the form of a label forwarding table; in addition, for each time slice, a preset label of a link between connected satellites is calculated for each node, and the calculation result is injected into the satellite-borne switch of the corresponding satellite.
Further, the destination label encapsulated in the data packet in the step (1) is an original destination label before the link fails.
Further, the label forwarding table calculated by the space-based network controller in step (1) includes a corresponding relationship between the destination label and the egress port.
Further, in the step (2), the packaging position of the preset label is positioned before the target label in the step (1); and after the link fails, bypassing the failed link through the preset label.
Further, the new label forwarding table in step (4) updates the egress port information, which guides the data packet to bypass the failed link for addressing and forwarding, compared with the label forwarding table in step (1).
The following is a more specific example:
as shown in fig. 1, a method for quickly protecting inter-satellite links of a low-rail carrier network based on pressing a preset tag includes the following steps:
(1) the space-based network controller calculates a forwarding table and a preset backup label corresponding to each satellite node in the satellite bearing network, and injects the forwarding tables and the preset backup labels into the satellite-borne switch of each satellite, and the satellite-borne switch carries out addressing forwarding on the data packet according to the forwarding table;
(2) when the satellite-borne switch detects that the link fails, a preset backup label is pressed into a data message header, and then the satellite-borne switch carries out addressing forwarding on the data packet according to the newly pressed backup label;
(3) the satellite-borne switch reports the link information and the pressed backup label information to the space-based network controller;
(4) and the space-based network controller recalculates the path according to the acquired link information, injects the updated forwarding table into the satellite-borne switch of the corresponding satellite, and performs addressing forwarding on the data packet according to the updated forwarding table by the satellite-borne switch.
To implement the above method, a low earth orbit satellite communication system is required. Fig. 2 is a schematic diagram of a low-earth-orbit satellite bearer network fast routing method based on preset labels pressed in the system, which includes a service source node T1, a service destination node S1, a low-earth-orbit satellite constellation (each satellite carries a satellite-borne switch, and the satellites have inter-satellite links to realize interconnection), and an air-based network controller.
Under normal conditions, service data are sent to a destination node S1 from a source node T1, according to a main path obtained by calculation of a space-based network controller, a satellite-borne switch carries out addressing forwarding on the service data according to a destination label L6, and the path through which a data packet passes is T1-T4-T5-T6-S1.
When a link between L5 and L6 breaks down, the state of an adjacent inter-satellite link is monitored in real time by the satellite-borne switch of L5, and the service data cannot be transmitted through the inter-satellite link between L5 and L6, and then a backup label L3 is pressed in front of the label L6 according to a backup path calculated by a previous space-based network controller, and the satellite-borne switch carries out addressing forwarding according to a preset label L3. At this time, the service data is output from the 3 port of the L5, and the path that the data packet passes through is T1-T4-T5-T2-T3-T6-S1.
L5 reports the link information to the space-based network controller, the space-based network controller recalculates the routing information and injects the routing information into a corresponding satellite, the L5 satellite peels off the label L3, and the mapping relation between the label L6 and the port in the label table is updated to be an L6-3 port from an L6-2 port. And then the data is addressed and forwarded according to a T1-T4-T5-T2-T3-T6-S1 path.
In summary, in the low earth orbit satellite communication system, the forwarding table and the preset label are calculated in advance for the link to be protected and are injected into the satellite-borne switch, when the satellite-borne switch detects that the link fails, the preset label is pressed into a data packet header, the failed node or the link is bypassed according to the backup label, the affected service is transferred to the backup path and is sent to a destination node in the shortest time, then the satellite-borne switch reports the link information to the space-based network controller, the controller recalculates the path according to the link information and injects the updated label forwarding table into the corresponding satellite-borne switch, and the satellite-borne switch performs addressing forwarding on the data packet according to the updated label forwarding table, so that the rapid protection of the inter-satellite link of the low earth orbit satellite bearing network is realized.
The method is suitable for finding the backup path of service transmission in the shortest time when the node or the link in the low-orbit satellite network fails, thereby keeping the smooth service path, reducing transmission delay, flow loss and disorder, ensuring the reliable transmission of service data and improving the communication efficiency and the real-time property.
Claims (6)
1. A low-rail bearing network inter-satellite link rapid protection method based on a pressed preset label is characterized by comprising the following steps:
(1) the space-based network controller calculates a label forwarding table of each satellite node in the low-orbit satellite bearing network and a preset label after each connected link fails according to satellite ephemeris information, and injects the labels into a satellite-borne switch of a corresponding satellite, and the satellite-borne switch searches a label forwarding table for addressing and forwarding through a target label encapsulated in a data packet;
(2) when the satellite-borne switch detects that a link between connected satellites is invalid, pressing a preset label into a data packet header, and then, the satellite-borne switch carries out addressing forwarding on the data packet through the label forwarding table in the step (1) according to the newly pressed preset label;
(3) the satellite-borne switch reports the detection information of the link failure to the space-based network controller;
(4) the space-based network controller performs forwarding table and label centralized calculation again according to the link failure detection information, and injects the calculation result into each satellite-borne switch in the form of a new label forwarding table;
(5) and (4) after the satellite-borne switch receives the new label forwarding table, searching the new label forwarding table according to the target label in the step (1) for forwarding.
2. The method for fast protecting the inter-satellite link of the low-orbit bearer network based on the pressed preset tag according to claim 1, wherein in the step (1), the space-based network controller divides the inter-satellite network topology in one orbit period into a plurality of time slices according to the ephemeris information of the satellite, performs routing calculation for each time slice, and injects the calculation result into the on-satellite switch of the corresponding satellite in the form of a tag forwarding table; in addition, for each time slice, a preset label of a link between connected satellites is calculated for each node, and the calculation result is injected into the satellite-borne switch of the corresponding satellite.
3. The method for rapidly protecting the inter-satellite link of the low-rail carrier network based on the pressed preset tag as claimed in claim 1, wherein the destination tag encapsulated in the data packet in the step (1) is an original destination tag before the link fails.
4. The method for rapidly protecting the links between the low-rail load-bearing network and the satellite based on the pressed preset labels as claimed in claim 1, wherein the label forwarding table calculated by the space-based network controller in the step (1) includes a corresponding relationship between a destination label and an egress port.
5. The method for rapidly protecting the low-rail carrier network inter-satellite link based on the pressed preset label in the claim 1 is characterized in that in the step (2), the encapsulation position of the preset label is positioned before the target label in the step (1); and after the link fails, bypassing the failed link through the preset label.
6. The method for fast protecting links between low-rail carrier networks based on preset labels as claimed in claim 4, wherein the new label forwarding table in step (4) updates the egress port information compared with the label forwarding table in step (1), and the egress port information will guide the data packet to bypass the failed link for addressing forwarding.
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| EP3373532A1 (en) * | 2017-03-10 | 2018-09-12 | Juniper Networks, Inc. | Apparatus, system, and method for providing node protection across label-switched paths that share labels |
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