CN112968835B - Unicast label routing design method suitable for space-based network - Google Patents
Unicast label routing design method suitable for space-based network Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
- H04L45/502—Frame based
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
- H04B7/18584—Arrangements for data networking, i.e. for data packet routing, for congestion control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/12—Shortest path evaluation
Abstract
The invention discloses a unicast label routing design method suitable for a space-based network, and aims to solve the problem of unicast label routing calculation of a space-based network satellite node based on label forwarding. The scheme realizes the routing control technology on the space-based two-layer label network by optimizing and improving the IS-IS unicast routing protocol, can realize the calculation of the shortest path to other space-based network satellite nodes on a link layer, and generates unicast label forwarding tables to other space-based network satellite nodes, thereby establishing a two-layer label forwarding path at each space-based network satellite node and realizing the two-layer label routing forwarding of data in the space-based network. The scheme does not depend on a three-layer IP routing technology, can simplify the implementation of the routing exchange of the satellite nodes of the space-based network, reduce the complexity of a control plane and support high-capacity label exchange, does not need to redistribute IP addresses so as to support the rapid movement of the nodes, and is particularly suitable for the space-based network with limited satellite resources and dynamically changed links.
Description
Technical Field
The invention relates to the technical field of space-ground integrated network communication, in particular to a design method suitable for unicast label routing between space-based network satellite nodes.
Background
The space-ground integrated network is an information network consisting of satellites, constellations and corresponding ground infrastructure with different orbits, types and characteristics, which are connected together through inter-satellite and satellite-ground links and can be divided into a space-based network, a space-based access network and a ground node network according to the difference of the functions of satellite nodes. The space-based network is mainly deployed in a layered mode by adopting multifunctional satellites or ground gateway stations distributed on different orbital planes such as GEO, IGSO or HEO, global seamless coverage is achieved, the space-based network is mainly used for extension and expansion of the ground network, and functions of flow sharing, communication guarantee in a hostile environment, global communication transmission and the like can be provided for the ground network.
In a ground network, a mature MPLS multi-protocol label switching technology already exists, but an MPLS network belongs to an overlay network, a standard MPLS protocol stack is superimposed on an IP network, and MPLS label switching is not separated from support of a bottom layer IP technology, so a control plane of the MPLS technology is relatively complex, including an LDP protocol, an IP routing protocol, an ARP protocol, and the like, and MPLS label switching is established on the basis of IP routing convergence. Currently, an emerging segment routing technology is developed on the basis of the MPLS technology, and segment routing simplifies the control protocol of MPLS, diffuses label information through an IP routing protocol, but is also based on a bottom-layer IP routing technology and operates on a network layer. Both the MPLS technology and the segment routing technology implement label distribution and diffusion based on the network layer IP routing technology, and cannot be directly adapted to the two-layer label based space-based network routing switching architecture, and cannot be used for route calculation of the space-based network.
The ground MPLS multiprotocol exchange technology and the segment routing technology realize label distribution and routing calculation based on the network layer IP routing technology, the calculation is also a three-layer IP routing path, and label exchange is only an exchange mode superposed on the three-layer IP routing and is used for quickly exchanging and establishing an end-to-end connection-oriented label path.
Disclosure of Invention
The invention discloses a unicast label routing design method suitable for a space-based network, and aims to solve the problem of unicast label routing calculation of a space-based network satellite node based on label forwarding.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
a unicast label routing design method suitable for a space-based network comprises the following steps:
(1) embedding the satellite number of the space-based network satellite node into a system ID field in an NSAP (network name server) address in an IS-IS (intermediate system-intermediate system) unicast routing protocol, and uniformly setting other unused fields and bytes in the NSAP address to be the same fixed value in the space-based network;
(2) routing protocol frames are mutually sent between IS-IS unicast routing protocols of space-based network satellite nodes, and the routing protocol frames do not contain IPv4 addresses and IPv6 address information;
(3) the IS-IS unicast routing protocol of the space-based network satellite node receives the routing protocol frames of other space-based network satellite nodes and then processes the routing protocol frames, and validity check on an IPv4 address or an IPv6 address IS omitted in the processing process;
(4) after the interaction IS completed, the IS-IS unicast routing protocol of the space-based network satellite nodes performs shortest path calculation to generate shortest paths to NSAP addresses of other space-based network satellite nodes; wherein, under the condition that IP reachability does not exist, the shortest path calculation is still carried out;
(5) an IS-IS unicast routing protocol of the space-based network satellite node converts the generated shortest path into a unicast label forwarding table aiming at the satellite number according to the mapping relation between the NSAP address and the satellite number; the destination label in the unicast label forwarding table at least comprises a destination satellite number field.
When the routing protocol frames are mutually sent among IS-IS unicast routing protocols of the space-based network satellite nodes in the step (2), the routing protocol information IS directly loaded on the satellite link layer frames, and an output port of the forwarding plane routing protocol frames IS directly informed; wherein a field in the satellite link layer frame should be able to uniquely identify the frame as an IS-IS routing protocol frame.
Wherein, the process that the IS-IS unicast routing protocol of the space-based network satellite node in the step (3) receives the routing protocol frames of other space-based network satellite nodes IS as follows: the forwarding plane of the space-based network satellite node receives IS-IS routing protocol frames sent from other space-based network satellite nodes, the IS-IS routing protocol frames are identified according to fields in the link layer frames, and then the IS-IS routing protocol frames are submitted to the control plane; after receiving the IS-IS routing protocol frame, the control plane directly converts the satellite link layer frame into an Ethernet frame of a specific protocol type and transmits the Ethernet frame to an IS-IS unicast routing protocol of an upper layer.
When the IS-IS unicast routing protocol in the step (2) exchanges neighbor information through a routing protocol frame, the IS-IS unicast routing protocol carries port numbers used by the connection of the IS-IS unicast routing protocol and neighbors; the IS-IS unicast routing protocol stores the own satellite number, the port number used by the connection with the neighbor, the current neighbor satellite number information and the port number used by the current neighbor connection, and pushes the stored information to an SDN agent deployed on the space-based network satellite node for generating the adjacent topology of the satellite.
Compared with the background technology, the invention has the following advantages:
the invention does not depend on three-layer IP routing technology, directly realizes routing calculation at a link layer, can simplify the realization of space-based network satellite node routing exchange, reduces the complexity of a control plane, supports high-capacity label exchange, does not need to redistribute IP addresses so as to support the rapid movement of the nodes, and is particularly suitable for space-based networks with limited satellite resources and dynamically changed links.
Drawings
Fig. 1 is an exemplary diagram of an application scenario of the present invention.
Detailed Description
While the preferred embodiment of the present invention will be described with reference to fig. 1, it is to be understood that the preferred embodiment described herein is merely for purposes of illustration and explanation and is not intended to be a limitation of the present invention.
Fig. 1 shows an exemplary embodiment of a unicast label routing generated by a link state routing protocol IS-IS for a space-based network with improved operation, which IS composed of 2 satellite terminals, 4 GEO satellites, and 1 gateway station, where the communication entities are GEO satellites, gateway stations, and satellite terminals. The GEO satellites are connected through inter-satellite links, the GEO satellites are connected with the gateway stations through feeder links, the GEO satellites and the gateway stations are used as space-based network satellite nodes and operate an improved link state routing protocol IS-IS, and the satellite terminals are connected with the GEO satellites through satellite-ground links.
Fig. 1 depicts a scenario in which a space-based network runs the improved link state routing protocol IS-IS designed for unicast label routing. Wherein each space-based network satellite node runs an improved link state routing protocol IS-IS for generating unicast label routes. The figure shows a scene that a unicast label forwarding table IS generated by a link state routing protocol IS-IS which IS improved by the operation of a space-based network satellite node, and data with forwarding labels sent by a satellite terminal passes through the space-based network satellite node and searches the unicast label forwarding table for routing forwarding.
The invention realizes the routing control technology on the space-based two-layer label network by optimizing and improving the IS-IS unicast routing protocol, can realize the shortest path calculation to other space-based network satellite nodes at a link layer, and generates unicast label forwarding tables to other space-based network satellite nodes, thereby establishing two-layer label forwarding paths at each space-based network satellite node and realizing the two-layer label routing forwarding of data in the space-based network. The method specifically comprises the following steps:
a unicast label routing design method suitable for a space-based network comprises the following steps:
(1) embedding the satellite number of the space-based network satellite node into a system ID field in an NSAP (network name server) address in an IS-IS (intermediate system-intermediate system) unicast routing protocol, and uniformly setting other unused fields and bytes in the NSAP address to be the same fixed value in the space-based network;
(2) routing protocol frames are mutually sent between IS-IS unicast routing protocols of space-based network satellite nodes, and the routing protocol frames do not contain IPv4 addresses and IPv6 address information;
when the routing protocol frames are mutually sent between IS-IS unicast routing protocols of the space-based network satellite nodes, the routing protocol information IS directly loaded on the satellite link layer frames, and the output port of the forwarding plane routing protocol frames IS directly informed; wherein a field in the satellite link layer frame should be able to uniquely identify the frame as an IS-IS routing protocol frame.
When the IS-IS unicast routing protocol exchanges neighbor information through a routing protocol frame, the IS-IS unicast routing protocol carries the port number used by the connection of the IS-IS unicast routing protocol and a neighbor; the IS-IS unicast routing protocol stores the own satellite number, the port number used by the connection with the neighbor, the current neighbor satellite number information and the port number used by the current neighbor connection, and pushes the stored information to an SDN agent deployed on the space-based network satellite node for generating the adjacent topology of the satellite.
(3) The IS-IS unicast routing protocol of the space-based network satellite node receives the routing protocol frames of other space-based network satellite nodes and then processes the routing protocol frames, and validity check on an IPv4 address or an IPv6 address IS omitted in the processing process;
the process that the IS-IS unicast routing protocol of the space-based network satellite node receives the routing protocol frames of other space-based network satellite nodes IS as follows: the forwarding plane of the space-based network satellite node receives IS-IS routing protocol frames sent from other space-based network satellite nodes, the IS-IS routing protocol frames are identified according to fields in the link layer frames, and then the IS-IS routing protocol frames are submitted to the control plane; after receiving the IS-IS routing protocol frame, the control plane directly converts the satellite link layer frame into an Ethernet frame of a specific protocol type and transmits the Ethernet frame to an IS-IS unicast routing protocol of an upper layer.
(4) After the interaction IS completed, the IS-IS unicast routing protocol of the space-based network satellite nodes performs shortest path calculation to generate shortest paths to NSAP addresses of other space-based network satellite nodes; wherein, under the condition that IP reachability does not exist, the shortest path calculation is still carried out;
(5) an IS-IS unicast routing protocol of the space-based network satellite node converts the generated shortest path into a unicast label forwarding table aiming at the satellite number according to the mapping relation between the NSAP address and the satellite number; the destination label in the unicast label forwarding table at least comprises a destination satellite number field.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A unicast label routing design method suitable for a space-based network is characterized by comprising the following steps:
(1) embedding the satellite number of the space-based network satellite node into a system ID field in an NSAP (network name server) address in an IS-IS (intermediate system-intermediate system) unicast routing protocol, and uniformly setting other unused fields and bytes in the NSAP address to be the same fixed value in the space-based network;
(2) routing protocol frames are mutually sent between IS-IS unicast routing protocols of space-based network satellite nodes, and the routing protocol frames do not contain IPv4 addresses and IPv6 address information; when the routing protocol frames are mutually sent between IS-IS unicast routing protocols of the space-based network satellite nodes, the routing protocol information IS directly loaded on the satellite link layer frames, and the output port of the forwarding plane routing protocol frames IS directly informed; wherein, the field in the satellite link layer frame can uniquely identify the frame as an IS-IS routing protocol frame;
(3) the IS-IS unicast routing protocol of the space-based network satellite node receives the routing protocol frames of other space-based network satellite nodes and then processes the routing protocol frames, and validity check on an IPv4 address or an IPv6 address IS omitted in the processing process; the process that the IS-IS unicast routing protocol of the space-based network satellite node receives the routing protocol frames of other space-based network satellite nodes IS as follows: the forwarding plane of the space-based network satellite node receives IS-IS routing protocol frames sent from other space-based network satellite nodes, the IS-IS routing protocol frames are identified according to fields in the link layer frames, and then the IS-IS routing protocol frames are submitted to the control plane; after receiving the IS-IS routing protocol frame, the control plane directly converts the satellite link layer frame into an Ethernet frame of a specific protocol type and transmits the Ethernet frame to an IS-IS unicast routing protocol of an upper layer;
(4) after the interaction IS completed, the IS-IS unicast routing protocol of the space-based network satellite nodes performs shortest path calculation to generate shortest paths to NSAP addresses of other space-based network satellite nodes; wherein, under the condition that IP reachability does not exist, the shortest path calculation is still carried out;
(5) an IS-IS unicast routing protocol of the space-based network satellite node converts the generated shortest path into a unicast label forwarding table aiming at the satellite number according to the mapping relation between the NSAP address and the satellite number; the destination label in the unicast label forwarding table at least comprises a destination satellite number field.
2. The unicast label routing design method applicable to space-based network of claim 1, wherein in step (2), when the IS-IS unicast routing protocol exchanges neighbor information through a routing protocol frame, the IS-IS unicast routing protocol carries the port number used by its own connection with the neighbor; the IS-IS unicast routing protocol stores the own satellite number, the port number used by the neighbor connection, the current neighbor satellite number information and the port number used by the current neighbor connection, and pushes the stored information to an SDN agent deployed on the corresponding space-based network satellite node for generating the adjacent topology of the satellite.
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| CN114268593B (en) * | 2021-11-12 | 2024-04-12 | 网络通信与安全紫金山实验室 | SDN-based space satellite network source route forwarding method and device |
| CN114567370B (en) * | 2022-02-22 | 2023-12-29 | 中国电子科技集团公司第五十四研究所 | Distributed routing communication method for high-rail backbone network |
| CN115150319B (en) * | 2022-09-02 | 2022-11-22 | 中国电子科技集团公司第五十四研究所 | Simple and complex star multicast routing method based on distributed control |
| CN115426031B (en) * | 2022-11-03 | 2023-01-24 | 中国电子科技集团公司第五十四研究所 | Centralized and distributed combined space-based network routing control system |
| CN116996439B (en) * | 2023-09-27 | 2024-03-01 | 明阳时创(北京)科技有限公司 | SDN-based efficient routing addressing method and system |
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