WO2011003238A1

WO2011003238A1 - Request, advertisement method for route, communication device and system

Info

Publication number: WO2011003238A1
Application number: PCT/CN2009/072698
Authority: WO
Inventors: 徐小虎
Original assignee: 华为技术有限公司
Priority date: 2009-07-09
Filing date: 2009-07-09
Publication date: 2011-01-13

Abstract

A request, advertisement method for route, communication device and system are provided by the embodiments of the present invention. The route request method includes: transmitting an outbound route filter message to an adjacent routing device, wherein the outbound route filter message carries the route type information; receiving a route update message transmitted by the adjacent routing device according to the route type information carried by the outbound route filter message, and performing a route installation process according to the route update message. The route advertisement method includes: receiving an outbound route filter message transmitted by a routing device, wherein the outbound route filter message carries the route type information; transmitting the route update message to the routing device according to the route type information carried by the outbound route filter message for the routing device performing a route installation process according to the route update message. The embodiments of the present invention enable the technical effect of compressing the Routing Information Base (RIB), reducing the calculation quantity of the routing device receiving the routing information, increasing the route convergence speed, and improving the bandwidth utilization rate effectively.

Description

Routing request, notification method, communication device and system

Technical field

The embodiments of the present invention relate to the field of network communication technologies, and in particular, to a routing request, an advertising method, a communication device, and a system. Background technique

Routing is the act of passing information from the source to the destination through the network. It usually involves two basic actions: determining the best path and data exchange. The routing device is the primary node device for network transmission. The routing device determines the data forwarding, ie, nexthop, through the routing table. The routing table includes a Routing Information Base (hereinafter referred to as RIB) and a forwarding information base (Forwarding Information). Base, hereinafter referred to as: FIB). With the widespread deployment of multi-homed networks and traffic engineering, the number of Internet routes grows rapidly, and the capacity of routing tables that store routing information also increases rapidly. As a result, the cost of routing devices increases, and route convergence becomes slower, which is not conducive to rapid system response. The entire system works efficiently.

In order to solve the above technical problem, in the prior art, at the routing protocol level, for routing update information, each routing device performs routing calculation according to the existing Border Gateway Protocol (BGP) routing rule. The calculated best BGP route is saved to the RIB; in the routing control plane, the route in the RIB can be selectively installed into the FIB. The specific process may be to divide the routing information according to the prefix, and store the routing distributions for different prefixes in the FIB of the transport network called Aggregation Point Router (APR). . The APR aggregates the prefixes that are loaded into a Super Prefix (VP) route, and advertises these VP routes as common routes through the BGP routing device. The non-aggregation point routing device (non-APR) only needs to be These super-prefix routes can be loaded into the FIB. It is not necessary to load specific prefix blocks into the FIB, thereby compressing the FIB and reducing the capacity of the FIB stored in the routing table. In the process of implementing the present invention, the inventor has found that at least the following problems exist in the prior art: No APR or non-APR does not perform any compression on the RIB, thereby consuming memory resources and CPU computing resources, resulting in wasted bandwidth. Summary of the invention

The embodiment of the present invention provides a routing request, a notification method, a communication device, and a system, so as to solve the problem that the RIB is not compressed in the prior art, and the memory resources and the CPU computing resources are occupied, thereby causing bandwidth waste. The compression is performed to reduce the calculation amount of the routing device that receives the routing information, improve the route convergence speed, and effectively improve the bandwidth utilization.

An embodiment of the present invention provides a route request method, including:

Sending a route filtering message to the neighboring routing device, where the outgoing route filtering message carries route type information;

And receiving, by the neighboring routing device, a route update message sent according to the route type information carried in the outbound route filtering message, and performing route installation processing according to the route update message.

The embodiment of the invention provides a route notification method, including:

Receiving an outbound route filtering message sent by the routing device, where the outbound route filtering message carries route type information;

Transmitting the route to the routing device according to the routing type information carried in the outbound route filtering message. The embodiment of the present invention provides a communications device, including:

a first sending module, configured to send a route filtering message to the neighboring routing device, where the outgoing route filtering message carries route type information;

The first receiving module is configured to receive, by the neighboring routing device, a route update message sent according to the route type information carried in the outbound route filtering message, and perform route installation processing according to the route update message.

An embodiment of the present invention provides another communication device, including: a second receiving module, configured to receive an outbound route filtering message sent by the routing device, where the outbound route filtering message carries route type information;

a second sending module, configured to send a routing update message to the routing device according to the route type information carried in the outbound route filtering message received by the second receiving module, where the routing device performs the routing update message according to the routing Route installation processing.

The embodiment of the invention further provides a communication system, comprising: a first communication device and a second communication device,

The first communication device is configured to send a route filtering message to the second communication device, where the outgoing route filtering message carries route type information; and receives the second communication device carries the message according to the outgoing route filtering message. Route update message sent by the route type information, and performing route installation processing according to the route update message;

The second communication device is configured to receive an outbound route filtering message sent by the first communications device, where the outbound route filtering message carries route type information; and according to the route type information carried in the outbound route filtering message And the first communications device sends a routing update packet, where the first communications device performs routing installation processing according to the routing update packet.

In the embodiment of the present invention, the current routing device sends an ORF message to the neighboring routing device, so that the neighboring routing device sends the routing update packet according to the route type specified in the ORF message, thereby reducing the route in the RIB of the routing device. The quantity greatly reduces the RIB capacity requirement, and also reduces the route calculation amount of the routing device that receives the routing information, improves the route convergence speed, and effectively improves the bandwidth utilization. DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. One of ordinary skill in the art can also obtain other drawings based on these drawings without undue creative effort. 1 is a flowchart of an embodiment of a route request method according to the present invention;

2 is a flowchart of an embodiment of a route advertisement method according to the present invention;

3 is a schematic structural diagram of an embodiment of a communication device according to the present invention;

4 is a schematic structural diagram of another embodiment of a communication device according to the present invention;

FIG. 5 is a schematic structural diagram of an embodiment of a communication system according to the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

In the embodiment of the present invention, some routing devices do not need to install all routing information in the RIB or FIB, and do not need to transfer all routing information to the neighboring routing device. For example, non-APR only needs to install VP routes, transport network routes and popular prefix routes to its own RIB or FIB without installing other routes; for APR, not only all non-APR installations need to be installed. Routing, you also need to install all the detailed routes within its route prefix coverage. Therefore, the routing device may send an outbound route filter (hereinafter referred to as ORF) message to the neighboring routing device according to its own characteristics, and the ORF message indicates that the neighboring routing device only sends the route matching the specified route type information. Information can come over without having to send all routing information.

The embodiment of the routing request method of the present invention may include:

And receiving, by the neighboring routing device, a route update message sent according to the route type information carried in the outbound route filtering message, and performing route installation processing according to the route update message. Correspondingly, the embodiment of the route advertisement method of the present invention may include:

And sending the ORF message to the neighboring routing device by using the current routing device, so that the neighboring routing device learns the route for sending the ORF message, according to the route type information carried in the outbound route filtering message. The route type information of the device, which reduces the number of routes in the RIB in the non-APR, greatly reduces the RIB capacity requirement, reduces the route calculation amount of the routing device that receives the routing information, improves the route convergence speed, and effectively improves the bandwidth utilization. . FIG. 1 is a flowchart of an embodiment of a route request method according to the present invention. As shown in FIG. 1, the method in this embodiment includes:

101. Send a route filtering message to the neighboring routing device, where the outbound route filtering message carries route type information.

For example, the routing device can send an ORF message to a neighboring routing device. The route type information carried in the ORF message may include: first route type information corresponding to the first type of route that the aggregation point routing device and the non-aggregation point routing device are installed to the FIB, and/or, and only the aggregation point route is required. The second route type information corresponding to the second type of route that the device is installed to the FIB. The route type information of the second type carries the route prefix.

Specifically, the routing device may send an ORF message carrying route type information to its neighboring routing device. When the route type field in the ORF message carries the first route type information, that is, the first type of route is specified, when the ORF message receiver, that is, the neighboring routing device receives the ORF message, the neighboring The routing device encapsulates the routing information (including at least one of the VP routing information, the transport network routing information, and the popular prefix routing information) that meets the routing type information specified in the ORF in a routing update message and sends the routing information to the ORF message sender. Routing device. When the route type field in the ORF message carries the second route type information, that is, the second type route is specified, when the ORF message receiver, that is, the neighboring routing device receives the ORF message, the neighbor The routing device encapsulates the detailed routing information in the coverage of the specified route prefix in the routing update message and sends the routing information to the routing device of the ORF message sender.

When the route type field in the ORF message carries the first route type information and the second route type information, when the ORF message receiver, that is, the neighboring routing device receives the ORF message, the neighboring routing device will conform to the ORF. Routing information of the specified first route type information (including at least one of VP routing information, transport network routing information, and popular prefix routing information) and detailed routing information encapsulation within the route prefix coverage specified by the second routing type information The routing message is sent to the ORF message sender routing device.

The routing device in this embodiment may be a non-APR or an APR in the coverage of a certain routing prefix. Therefore, the routing device in this embodiment can obtain the VP routing information and the transmission network by sending an ORF message. The routing information and the popular prefix routing information are obtained, and the detailed routing information in the coverage of the route prefix is obtained.

102. Receive, by the neighboring routing device, a route update message sent according to the route type information carried in the outbound route filtering message, and perform route installation processing according to the route update message.

After the routing device that sends the ORF message receives the routing update packet sent by the neighboring routing device, it can perform the installation processing on the routing update message. The installation process may be: when the route type information is the first route type information, the routing device that sends the ORF message installs at least one of the route prefix routing information, the transport network routing information, and the popular prefix routing information to In the forwarding information base, when the routing type information is the second routing type information, the routing device that sends the ORF message installs the detailed routing information in the routing prefix coverage into the forwarding information base; when the routing type information is the first routing type information And the second route type information, the routing device that sends the ORF message, the at least one of the VP routing information, the transport network routing information, and the popular prefix routing information, and the routing prefix specified by the second routing type information. The routing information is installed into the forwarding information base. In this embodiment, the route update packet may be a BGP route update packet.

In this embodiment, the current routing device sends an ORF message to the neighboring routing device, so that the neighboring routing device sends the routing information as needed according to the routing type specified in the ORF message, thereby reducing the number of routes in the RIB in the routing device, which is greatly reduced. The capacity requirement of the RIB also reduces the route calculation amount of the routing device that receives the routing information, improves the route convergence speed, and effectively improves the bandwidth utilization.

2 is a flowchart of an embodiment of a route advertisement method according to the present invention. As shown in FIG. 2, the method in this embodiment includes:

201. Receive an outbound route filtering message sent by the routing device, where the outbound route filtering message carries route type information.

For example, the neighboring routing device can receive the ORF message sent by the current routing device. The route type information carried in the ORF message may include: first route type information corresponding to the first type of route that the aggregation point routing device and the non-aggregation point routing device install to the forwarding information base, and/or, and only need to be aggregated The routing device is configured to install the second routing type information corresponding to the second type of routing information in the forwarding information base, where the second routing type information carries the routing prefix.

Specifically, the neighboring routing device can receive the ORF message sent by other routing devices. In this embodiment, when the route type field in the ORF message carries the first route type information, that is, the first type of route is specified, when the neighboring routing device receives the ORF message, the adjacent route The device can encapsulate the routing information (including at least one of the VP routing information, the transport network routing information, and the popular prefix routing information) that meets the routing type information specified in the ORF in the routing update packet, and send the ORF message to the ORF message. Party routing device.

When the route type field in the ORF message carries the second route type information, that is, the second type route is specified, when the ORF message receiver, that is, the neighboring routing device receives the ORF message, the neighbor The routing device encapsulates the detailed routing information in the specified route prefix coverage in the routing update message and sends the routing information to the routing device of the ORF message sender.

The route type field in the ORF message carries the first route type information and the In the case of the routing information, when the ORF message receiver, that is, the neighboring routing device receives the ORF message, the neighboring routing device will conform to the routing information of the first routing type information specified in the ORF (including VP routing information, The at least one routing information in the transmission network routing information and the popular prefix routing information, and the detailed routing information in the route prefix coverage specified by the second routing type information are encapsulated in the routing update message and sent to the routing device of the ORF message sender.

202. Send a path to the routing device according to the route type information carried in the outbound route filtering message. In this embodiment, when the routing device that sends the ORF message receives the route update message sent by the neighboring routing device, The route update processing is performed on the route update. The installation process may be: when the route type information is the first route type information, the routing device that sends the ORF message installs at least one of the route prefix routing information, the transport network routing information, and the popular prefix routing information to In the forwarding information base, when the routing type information is the second routing type information, the routing device that sends the ORF message installs the detailed routing information in the routing prefix coverage into the forwarding information base; when the routing type information is the first routing type information And the second routing type information, the routing device that sends the ORF message, the at least one routing information of the VP routing information, the transmission network routing information, and the popular prefix routing information, and the routing prefix specified by the second routing type information The routing information is installed into the forwarding information base.

In this embodiment, the route update packet may be a BGP route update packet.

In this embodiment, the NR message sent by the routing device is received, so that the neighboring routing device sends the routing information as needed according to the routing type specified in the ORF message, which reduces the number of routes in the RIB in the routing device, and greatly reduces the capacity requirement for the RIB. It also reduces the route calculation amount of the routing device that receives the routing information, improves the route convergence speed, and effectively improves the bandwidth utilization.

Corresponding to the embodiment of the routing request method of the present invention, an embodiment of the present invention further provides a communication device.

FIG. 3 is a schematic structural diagram of an embodiment of a communication device according to the present invention. As shown in FIG. 3, the communication device in this embodiment may include: a first sending module 11 and a first receiving module 12. First sending module 11 is configured to send a route filtering message to the neighboring routing device, where the outbound route filtering message carries the route type information. The first receiving module 12 is configured to receive, by the neighboring routing device, the The route update message sent by the route type information is subjected to route installation processing according to the route update message.

The first sending module 11 can send an ORF message to the neighboring routing device. The route type information carried in the ORF message may include: first route type information corresponding to the first type of route that the aggregation point routing device and the non-aggregation point routing device are installed to the FIB, and/or, and only the aggregation point route is required. The second route type information corresponding to the second type of route that the device is installed to the FIB. When the route type information is the first route type information, the route update message includes: at least one of the super prefix route information, the transport network route information, and the popular prefix route information. When the route type information is the second route type information, the route update message includes: detailed route information in the coverage of the route prefix.

Specifically, the first sending module 11 in the communications device of this embodiment may send an ORF message carrying routing type information to the neighboring routing device. When the route type field in the ORF message carries the first route type information, that is, the first type of route is specified, when the ORF message receiver, that is, the neighboring routing device receives the ORF message, the neighboring The routing device encapsulates the routing information (including at least one of the VP routing information, the transport network routing information, and the popular prefix routing information) that meets the routing type information specified in the ORF in the routing update packet, and sends the packet to the first embodiment. A receiving module 12.

When the route type field in the ORF message carries the second route type information, that is, the second type route is specified, when the ORF message receiver, that is, the neighboring routing device receives the ORF message, the neighbor The routing device encapsulates the detailed routing information in the specified route prefix coverage in the routing update message and sends the routing information to the first receiving module 12 in this embodiment.

When the route type field in the ORF message carries the first route type information and the second route type information, when the ORF message receiver, that is, the neighboring routing device receives the ORF message, the neighboring routing device Routing information that conforms to the first route type information specified in the ORF (including at least one routing information in the VP routing information, the transmission network routing information, and the popular prefix routing information) and the detailed routing information in the route prefix coverage specified by the second routing type information is encapsulated in the routing update packet and sent to the implementation. The first receiving module 12 of the example.

After the first receiving module 12 in the communication device of the embodiment receives the routing update message sent by the neighboring routing device, the routing update process can be performed on the routing update message. The installation process may be: when the route type information is the first route type information, the routing device that sends the ORF message installs at least one of the route prefix routing information, the transport network routing information, and the popular prefix routing information to In the forwarding information base, when the routing type information is the second routing type information, the routing device that sends the ORF message installs the detailed routing information in the routing prefix coverage into the forwarding information base; when the routing type information is the first routing type information And the second routing type information, the routing device that sends the ORF message, the at least one routing information of the VP routing information, the transmission network routing information, and the popular prefix routing information, and the routing prefix specified by the second routing type information The routing information is installed into the forwarding information base.

The communication device of this embodiment sends an ORF message to the neighboring routing device through the first sending module, so that the neighboring routing device sends the routing information as needed according to the routing type specified in the ORF message, thereby reducing the number of routes in the RIB in the routing device. , greatly reducing the capacity requirement of the RIB, and reducing the route calculation amount of the first receiving module receiving the routing information, improving the route convergence speed, and effectively improving the bandwidth utilization.

Corresponding to the embodiment of the route advertisement method of the present invention, another embodiment of the present invention provides another communication device.

4 is a schematic structural diagram of another embodiment of a communication device according to the present invention. As shown in FIG. 4, the communication device in this embodiment may include: a second receiving module 21 and a second sending module 22. The second receiving module 21 is configured to receive an outbound route filtering message sent by the routing device, where the outbound route filtering message carries route type information. The second sending module 22 is configured to filter the message according to the outbound route received by the second receiving module 21. The routing type information carried in the routing information is sent to the routing device, and the routing device performs routing installation processing according to the routing update packet. For example, the second receiving module 21 can receive the ORF message sent by the current routing device. The route type information carried in the ORF message may include: first route type information corresponding to the first type of route that the aggregation point routing device and the non-aggregation point routing device install to the forwarding information base, and/or, and only need to be aggregated The second routing type information corresponding to the second type of routing that the point routing device installs to the forwarding information base. When the route type information is the first route type information, the route update message includes: at least one of the super prefix route information, the transport network route information, and the popular prefix route information. When the routing type information is the second routing type information, the routing update message includes: detailed routing information in the coverage of the routing prefix.

Specifically, the second receiving module 21 can receive the ORF message sent by other routing devices. In this embodiment, when the route type field in the ORF message carries the first route type information, that is, the first type of route, when the second receiving module 21 receives the ORF message, it can be known. The routing device that sends the ORF message requests the first type of routing. Therefore, the second sending module 22 can use the routing information (including the VP routing information, the transport network routing information, and the popular prefix routing information) that meets the routing type information specified in the ORF. At least one routing information encapsulated in the routing update message is sent to the ORF message sender routing device.

When the route type field in the ORF message carries the second route type information, that is, the second type route is specified, when the second receiving module 21 receives the ORF message, the second sending module 22 specifies the route. The detailed routing information in the prefix coverage is encapsulated in the routing update message and sent to the routing device of the ORF message sender.

When the route type field in the ORF message carries the first route type information and the second route type information, when the second receiving module 21 receives the ORF message receiver, the second sending module 22 will meet the ORF designation. The routing information of the first routing type information (including at least one routing information of the VP routing information, the transmission network routing information, and the popular prefix routing information) and the detailed routing information within the routing prefix coverage specified by the second routing type information are encapsulated in The routing update message is sent to the ORF message sender routing device.

In this embodiment, when the routing device that sends the ORF message receives the second sending module 22 After the route update packet is sent, the route update packet can be routed and installed. The installation process may be: when the route type information is the first route type information, the routing device that sends the ORF message installs at least one of the route prefix routing information, the transport network routing information, and the popular prefix routing information to In the forwarding information base, when the routing type information is the second routing type information, the routing device that sends the ORF message installs the detailed routing information in the routing prefix coverage into the forwarding information base; when the routing type information is the first routing type information And the second routing type information, the routing device that sends the ORF message, the at least one routing information of the VP routing information, the transmission network routing information, and the popular prefix routing information, and the routing prefix specified by the second routing type information The routing information is installed into the forwarding information base.

In this embodiment, the route update packet may be a BGP route update packet.

In this embodiment, the second receiving module receives the ORF message sent by the routing device, so that the second sending module sends the routing information as needed according to the routing type specified in the ORF message, which reduces the number of routes in the RIB in the routing device, and greatly reduces the RIB. The capacity requirement also reduces the route calculation amount of the routing device that receives the routing information, improves the route convergence speed, and effectively improves the bandwidth utilization.

FIG. 5 is a schematic structural diagram of an embodiment of a communication system according to the present invention. As shown in FIG. 5, the communication system of this embodiment may include: a first communication device 1 and a second communication device 2, where the first communication device 1 is used for The second communication device 2 sends a route filtering message, and the outbound route filtering message carries the route type information; and receives the route update message sent by the second communication device 2 according to the route type information carried in the outbound route filtering message. And performing routing installation processing according to the route update message; the second communication device 2 is configured to receive an outbound route filtering message sent by the first communication device 1, where the outbound route filtering message carries route type information; The route type information carried in the route filtering message sends a route update message to the first communication device 1 for the first communication device 1 to perform route installation processing according to the route update message.

The route type information includes: first route type information corresponding to a first type route that needs to be aggregated by the aggregation point routing device and the non-aggregation point routing device to the forwarding information base, and/or, and only needs the aggregation point routing device to be installed to The second route type letter corresponding to the second type of routing of the forwarding information base The second route type information carries a route prefix. When the route type information is the first route type information, the route update message includes: at least one of the super prefix route information, the transport network route information, and the popular prefix route information. When the routing type information is the second routing type information, the routing update message includes: detailed routing information in the coverage of the routing prefix.

In the communication system of this embodiment, the specific implementation of the first communication device 1 corresponds to the embodiment of the route request method shown in FIG. 1. The specific implementation of the second communication device 2 is similar to the embodiment of the route advertisement method shown in FIG. Correspondingly, the interaction process and implementation principle have been described in detail, and will not be described here.

The communication system of this embodiment sends an ORF message to the second communication device by using the first communication device, so that the second communication device can learn the route type information of the first communication device, so that the second communication device only uses the route type information. The related routing information is sent to the first communications device, thereby reducing the number of routes in the RIB in the first communications device, greatly reducing the capacity requirement for the RIB or the FIB, and reducing the route calculation amount of the first communications device, and improving The route convergence speed effectively improves the bandwidth utilization.

Meanwhile, the embodiment of the present invention further provides a computer readable medium, which may be a medium that contains, stores, communicates, propagates, or transmits a computer program, and the computer program is used to run A program, system apparatus, system or device program provided by an embodiment of the present invention, or a program related to the instruction. The computer readable medium can be an electronic, magnetic, electromagnetic, optical, infrared, or semiconductor system, apparatus, device, propagation medium, or computer memory.

In the embodiment of the present invention, when the computer program is running, it can implement:

In another embodiment of the present invention, the computer program can also implement at runtime: Receiving an outbound route filtering message sent by the routing device, where the outbound route filtering message carries route type information;

And sending, by the current routing device, the ORF message to the neighboring routing device by using the route type information carried in the outbound route filtering message, so that the neighboring routing device according to the route specified in the ORF message The type sends the routing information on demand, which reduces the number of routes in the RIB in the routing device, greatly reduces the capacity requirement for the RIB, reduces the route calculation of the routing device that receives the routing information, improves the route convergence speed, and effectively improves the bandwidth utilization. rate.

It should be noted that the above embodiments are only intended to illustrate the technical solutions of the present invention and are not to be construed as limiting the embodiments of the present invention. Modifications or equivalent substitutions may be made to the technical solutions of the present invention, and such modifications or equivalents may not detract from the technical solutions of the present invention.

Claims

Rights request

A route request method, comprising:

The routing request method according to claim 1, wherein the routing type information comprises:

The first route type information corresponding to the first type of route that the aggregation point routing device and the non-aggregation point routing device are installed to the forwarding information base, and/or the second type that only needs the aggregation point routing device to be installed to the forwarding information base The second route type information corresponding to the route, where the second route type information carries a route prefix.

The route requesting method according to claim 2, wherein, when the route type information is the first route type information, the route update message includes:

At least one routing information in the super prefix routing information, the transport network routing information, and the popular prefix routing information.

The route requesting method according to claim 2, wherein, when the route type information is the second route type information, the route update message includes:

The routing prefix covers detailed routing information within the range.

The route requesting method according to any one of claims 1 to 4, wherein the route update message is a border gateway protocol route update message.

6. A route advertisement method, comprising:

And sending, by the route type information carried in the outbound route filtering message, a routing update packet to the routing device, where the routing device further

The route advertisement method according to claim 6, wherein the route type information includes:

The route advertisement method according to claim 7, wherein, when the route type information is the first route type information, the route update message includes:

The route advertisement method according to claim 7, wherein when the route type information is the second route type information, the route update message includes:

The routing prefix covers detailed routing information within the range.

The route advertisement method according to any one of claims 6 to 9, wherein the route update message is a border gateway protocol route update message.

1 1. A communication device, comprising:

The communication device according to claim 1, wherein the route type information includes:

The first route type information corresponding to the first type of route that the aggregation point routing device and the non-aggregation point routing device are installed to the forwarding information base, and/or the second type that only needs the aggregation point routing device to be installed to the forwarding information base The second route type information corresponding to the route, the second route type information The route prefix is carried in it.

The communication device according to claim 12, wherein, when the route type information is the first route type information, the route update message includes:

The communication device according to claim 12, wherein, when the route type information is the second route type information, the route update message includes:

The routing prefix covers detailed routing information within the range.

15. A communication device, comprising:

a second receiving module, configured to receive an outbound route filtering message sent by the routing device, where the outbound route filtering message carries route type information;

The communication device according to claim 15, wherein the route type information comprises:

The communication device according to claim 16, wherein, when the route type information is the first route type information, the route update message includes:

The communication device according to claim 16, wherein, when the route type information is the second route type information, the route update message includes: The routing prefix covers detailed routing information within the range.

A communication system, comprising: a first communication device and a second communication device, wherein the first communication device is configured to send a route filtering message to the second communication device, where the route filtering message is sent out Carrying route type information; and receiving a route update message sent by the second communication device according to the route type information carried in the outbound route filtering message, and performing route installation processing according to the route update message;

The communication system according to claim 19, wherein the route type information comprises:

The communication system according to claim 20, wherein, when the route type information is the first route type information, the route update message includes:

The communication system according to claim 20, wherein, when the route type information is the second route type information, the route update message includes:

The routing prefix covers detailed routing information within the range.