CN117614887A - Method and device for transmitting BGP community attribute values in OSPF - Google Patents

Method and device for transmitting BGP community attribute values in OSPF Download PDF

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CN117614887A
CN117614887A CN202410087589.7A CN202410087589A CN117614887A CN 117614887 A CN117614887 A CN 117614887A CN 202410087589 A CN202410087589 A CN 202410087589A CN 117614887 A CN117614887 A CN 117614887A
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route
ospf
bgp
community attribute
redistribution
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CN117614887B (en
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胡嘉祺
宋长友
陈睿彧
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China Broadband Communications Co ltd
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China Broadband Communications Co ltd
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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
    • H04L45/02—Topology update or discovery
    • H04L45/04—Interdomain routing, e.g. hierarchical routing
    • 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

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The application relates to a method and a device for transmitting BGP community attribute values in OSPF, wherein the method comprises the steps of respectively configuring a redistribution command of a BGP route and a redistribution command of an OSPF route; mapping the standard community attribute value of the BGP route into an external route label field of the OSPF route according to the redistribution command of the BGP route; and mapping the label value of the external route label to the standard community attribute field of the BGP route according to the redistribution command of the OSPF route. When the BGP route is redistributed to the OSPF route, the standard community attribute value is mapped to the external route label field of the OSPF, and when the OSPF route is redistributed to the BGP route, the label value of the external route label field is mapped to the standard community attribute field of the BGP route, so that the problem of community attribute value loss is solved, the complexity of BGP route filtering is reduced, and the generation of suboptimal routes is reduced.

Description

Method and device for transmitting BGP community attribute values in OSPF
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a method and apparatus for transmitting BGP community attribute values in OSPF.
Background
BGP (Border Gateway Protocol ) and OSPF (Open Shortest Path First, open shortest path first) are dynamic routing protocols that are relatively common today, and bidirectional redistribution of these two protocols is often encountered in real life. For example, in a branch node networking of an enterprise, BGP is typically used on the operator side and OSPF is typically used on the client side, thus encountering situations where both protocols pass route entries through bi-directional redistribution on border routers.
In a networking using BGP routing protocol, BGP routes may sometimes need to be redistributed to OSPF when they pass through an OSPF area, but community properties, i.e., community properties, of BGP are lost after such redistribution. Moreover, since the specific routes are generally marked by adopting a mode of setting the community in the BGP area, the routing policies are matched according to the community value at the boundary, so if the community value is lost, the corresponding routes to which some portions should be matched cannot be matched, and thus the routes leak. For example, in a branch node network of multiple enterprise, BGP routes are often redistributed to OSPF, and from OSPF to BGP, and a problem of suboptimal paths is caused by misconnection or mismatch. Therefore, a large number of route marks must be made on two border routers configured with BGP and OSPF bidirectional redistribution, and route filtering is performed for the route marks, so as to prevent sub-optimal paths from being generated. However, if the OSPF of the customer intranet has backup links connected to other branch nodes, the configuration complexity will be greatly increased.
Disclosure of Invention
In view of the foregoing, the present application proposes a method and apparatus for delivering BGP community attribute values in OSPF to solve the foregoing problems.
In one aspect of the present application, a method for delivering BGP community attribute values in OSPF is provided, including the following steps:
respectively configuring a redistribution command of a BGP route and a redistribution command of an OSPF route;
mapping the standard community attribute value of the BGP route to an external route label field of the OSPF route according to the redistribution command of the BGP route;
and mapping the label value of the external route label field to the community attribute field of the BGP route according to the redistribution command of the OSPF route.
As an optional embodiment of the present application, optionally, the redistribution command for separately configuring BGP routes and the redistribution command for OSPF routes include:
configuring a redistribution command of a BGP route, and adding a corresponding redistribution function switch in the redistribution command of the BGP route;
configuring a redistribution command of an OSPF route, and adding a corresponding redistribution function switch in the redistribution command of the OSPF route.
As an optional embodiment of the present application, optionally, before mapping the standard community attribute value of the BGP route into the external routing label field of the OSPF route according to the redistribution command of the BGP route, the method further includes:
and configuring a standard community attribute value of the BGP route.
As an optional embodiment of the present application, optionally, the mapping, according to the redistribution command of the OSPF, the label value of the external route label to the community attribute field of the BGP route includes:
determining a tag value in the external route tag field for a OSPF external routes route and OSPF NSSA external routes route of the OSPF routes;
and mapping the label value to the standard community attribute field of the BGP according to the redistribution command of the OSPF.
As an optional embodiment of the present application, optionally, after mapping the label value of the external routing label field to the standard community attribute field of the BGP route according to the redistribution command of the OSPF, the method further includes:
redistributing preset community attribute values in the BGP route to the OSPF route;
the preset community attribute values comprise an external propagation prohibition attribute value, an announcement prohibition attribute value and a propagation prohibition attribute value in a sub-autonomous system.
As an optional embodiment of the present application, optionally, after mapping the label value of the external routing label field to the standard community attribute field of the BGP route according to the redistribution command of the OSPF, the method further includes:
and configuring a label value of an external route label field corresponding to the preset community attribute value in the OSPF route.
In another aspect of the present application, an apparatus is provided for implementing a method for delivering BGP community attribute values in OSPF according to any one of the foregoing embodiments, where the method includes:
a redistribution command configuration module configured to configure a redistribution command of the BGP route and a redistribution command of the OSPF route, respectively;
the BGP route redistribution module is configured to map the standard community attribute value of the BGP route into an external route label field of the OSPF route according to the redistribution command of the BGP route;
and the OSPF route redistribution module is configured to map the label value of the external route label field to the standard community attribute field of the BGP route according to the redistribution command of the OSPF.
In another aspect of the present application, there is provided a control system comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured, when executing the executable instructions, to implement the method for communicating BGP community attribute values in OSPF of any of the above.
In yet another aspect of the present application, a non-transitory computer readable storage medium is provided, having stored thereon computer program instructions that, when executed by a processor, implement the method for communicating BGP community attribute values in OSPF of any of the above.
The invention has the technical effects that:
the method and the device solve the problem that community attributes, namely community attributes, of BGP after redistribution are lost in the process that BGP routes are redistributed to OSPF routes and then are redistributed to BGP from the OSPF routes. When the BGP route is redistributed to the OSPF route, the standard community attribute value is mapped to the external route label (External route tag) field of the OSPF, and when the OSPF route is redistributed to the BGP route, the label value of the external route label field is mapped to the standard community attribute field of the BGP route, so that a redistribution mechanism between the BGP route and the OSPF route is enhanced, the BGP route carrying the community attribute value is redistributed to the OSPF route, and then the community value of the route is still reserved after the OSPF route is redistributed to the BGP route, thereby solving the problem of community loss, reducing the complexity of BGP route filtering and reducing the generation of suboptimal routes.
Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features and aspects of the present disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a flow chart illustrating a method for communicating BGP community attribute values in OSPF in accordance with the present invention.
Detailed Description
Various exemplary embodiments, features and aspects of the disclosure will be described in detail below with reference to the drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
In addition, numerous specific details are set forth in the following detailed description in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements, and circuits well known to those skilled in the art have not been described in detail in order not to obscure the present disclosure.
Example 1
As shown in fig. 1, in one aspect, the present application proposes a method for delivering BGP community attribute values in OSPF, including the following steps:
s100, respectively configuring a redistribution command of a BGP route and a redistribution command of an OSPF route;
s200, mapping the standard community attribute value of the BGP route to an external route label field of the OSPF route according to the redistribution command of the BGP route;
s300, according to the redistribution command of the OSPF route, mapping the label value of the external route label field to the standard community attribute field of the BGP route.
In this embodiment, in order to solve the problem that the community attribute, i.e., the community attribute, of BGP after redistribution appears in the process of redistributing BGP routes to OSPF routes and then from OSPF routes to BGP. When the BGP route is redistributed to the OSPF route, the standard community attribute value is mapped to the field of the external route label (External route tag) of the OSPF, and when the OSPF route is redistributed to the BGP route, the label value of the external route label field is mapped to the standard community attribute field of the BGP route, so that a redistribution mechanism between the BGP route and the OSPF route is enhanced, the BGP route carrying the standard community attribute value is redistributed to the OSPF route, and then the community value of the route is still reserved after the OSPF route is redistributed to the BGP route, thereby solving the problem of community loss, reducing the complexity of BGP route filtration and reducing the generation of suboptimal routes.
Specifically, in step S100, a BGP route redistribution command and an OSPF route redistribution command are configured, respectively.
As an optional embodiment of the present application, optionally, the redistribution command for separately configuring BGP routes and the redistribution command for OSPF routes include:
configuring a redistribution command of a BGP route, and adding a corresponding redistribution function switch in the redistribution command of the BGP route;
configuring a redistribution command of an OSPF route, and adding a corresponding redistribution function switch in the redistribution command of the OSPF route.
It should be specifically noted that, in the present application, a redistribution function switch needs to be added to the redistribution command, so that after the redistribution function switch is turned on, the redistribution between BGP routes and OSPF routes will perform automatic mapping of standard communications and External route tag.
The following will describe an example of command behavior of VYOS.
BGP side commands:
opening function
set protocols bgp<ASN>address-family ipv4-unicast redistribute ospf mapping-tag-to-community
Shut-off function
delete protocols bgp<ASN>address-family ipv4-unicast redistribute ospf mapping-tag-to-community
OSPF side command:
opening function
set protocols ospf redistribute bgp mapping-community-to-tag
Shut-off function
delete protocols ospf redistribute bgp mapping-community-to-tag
In this way, in the BGP routing configuration process, the present application enables a function on a BGP router of a specific Autonomous System (ASN) through a corresponding open function command: BGP routes are redistributed to the OSPF regions. Wherein < ASN > can be replaced by an autonomous system number, address-family is a specified address family, IPv 4-unified is a specified IPv4 unicast route, OSPF is a specified OSPF process, mapping-tag-to-community is a label attribute mapping BGP to OSPF, facilitating propagation of BGP routing information in OSPF area and enabling OSPF to utilize the routing information. Meanwhile, the functions are closed by configuring corresponding closing function commands in the BGP route, and the delete key is used for deleting specific configuration. Further, in the process of configuring the OSPF route, the route from BGP is redistributed to OSPF through the corresponding open function command, the community attribute of BGP is mapped to the label, and the function is closed through configuring the corresponding close function command in the OSPF route. So that the redistribution between BGP routes and OSPF reasons will automatically map the standard communications and External route tag after the corresponding switches are opened. And further, the purpose of maintaining the route communication after the BGP is redistributed to the OSPF and then redistributed to the BGP by the OSPF is realized.
Further, through step S200, according to the redistribution command of the BGP route, the standard community attribute value of the BGP route is mapped to the external route label field of the OSPF route. That is, the present application solves the problem of traffic loss by mapping the value of the standard traffic attribute in BGP routes into the OSPF's external route tag (External route tag).
It should be further noted that, as an optional embodiment of the present application, optionally, before mapping, according to the redistribution command of the BGP route, the standard community attribute value of the BGP route into the external routing label field of the OSPF route, the method further includes:
and configuring a standard community attribute value of the BGP route.
In order to optimize route management, the application redistributes BGP routes into OSPF routes, enabling the OSPF protocol to use BGP route information to better manage network routes. Before the OSPF route receives the BGP route, the BGP route firstly configures the corresponding standard community attribute value, so that the OSPF route controls the corresponding route propagation according to the received different community attribute values.
Then, in step S300, according to the redistribution command of the OSPF route, the label value of the external route label field is mapped to the standard community attribute field of the BGP route.
As an optional embodiment of the present application, optionally, the mapping, according to the redistribution command of the OSPF, the label value of the external routing label field to a standard community attribute field of the BGP route includes:
determining a tag value in the external route tag field for a OSPF external routes route and OSPF NSSA external routes route of the OSPF routes;
and mapping the label value to the standard community attribute field of the BGP according to the redistribution command of the OSPF.
In this embodiment, when the OSPF route is redistributed to the BGP route, the label value in the external route label field is mapped to the traffic field of the BGP route for both the OSPF external routes route and the OSPF NSSA external routes route according to the configured redistribution command, that is, the value in External route tag is copied to the traffic field of the BGP route. Different types of external routes, OSPF External Routes routes and OSPF NSSA External Routes routes, have different External route tag values. Specifically, the values in OSPF External Routes route and OSPF NSSA External Routes route External route tag range from 0x0000000 to 32-bit values of 0 xFFFFFFFF. Since the external routing tag can store 4 bytes, only the first communication value of the BGP routing entry needs to be mapped, the rest of the communication needs to be ignored, and in actual processing, only one communication mark is usually marked for the BGP routing entry, so that both fields are 4 bytes and can be mapped directly.
It should also be noted that BGP's community and OSPF's External route tag are both optional values, and if there is no such value in the route entry, no mapping operation is performed.
Furthermore, after the OSPF has the standard community function capable of transmitting BGP, the route filtering can be more conveniently performed by utilizing the preset community attribute value of BGP, namely the Well-known Communities value.
As an optional embodiment of the present application, optionally, after mapping the label value of the external routing label field to the standard community attribute field of the BGP route according to the redistribution command of the OSPF, the method further includes:
redistributing preset community attribute values in the BGP route to the OSPF route;
the preset community attribute values comprise an external propagation prohibition attribute value, an announcement prohibition attribute value and a propagation prohibition attribute value in a sub-autonomous system.
As an optional embodiment of the present application, optionally, after mapping the label value of the external routing label field to the standard community attribute field of the BGP route according to the redistribution command of the OSPF, the method further includes:
and configuring a label value of an external route label corresponding to the preset community attribute value in the OSPF route.
It should be noted that, the standard community attribute value, that is, the standard community, includes a preset community attribute value (well-known communities), and the standard community attribute value is that 4 values are agreed from the standard community to give a special meaning. After the OSPF has the standard community function capable of transmitting BGP, a Well-known Communities value is marked when the BGP receives a route and then redistributed to the OSPF, or a label value of a corresponding external route label, namely External route tag value, is directly set when the OSPF is configured to redistribute the BGP route, when the OSPF is redistributed to the BGP on another border router, the BGP can obtain a Well-known Communities value mapped from the External route tag value of the OSPF, and then the established routing operation of Well-known Communities is executed, so that complex BGP route filtering strategies are not required to be reconfigured. The preset community attribute value (Well-known Communities value) includes a forbidden external propagation attribute value no_export (0 xFFFFFF 01), a forbidden advertisement attribute value no_advertise (0 xFFFFFF 02) and a forbidden intra-subsystem propagation attribute value no_export_subsonic fed (0 xffff 03).
The routing filtering function provided by Well-known Communities and mapped External route tag are described in detail below.
NO_EXPORT (0xFFFFFF01)<->tag 4294967041
NO_ADVERTISE (0xFFFFFF02)<->tag 4294967042
NO_EXPORT_SUBCONFED (0xFFFFFF03)<->tag 4294967043
By configuring the no_exit (0 xFFFFFF 01) attribute value to indicate that BGP routers do not publish routing information with this attribute to other BGP peers, some routing information is prevented from being diffused throughout the BGP network to achieve finer routing control, and the corresponding External route tag value is 4294967041, which is added to the routing information for identification in operations such as route filtering and route redistribution.
By configuring the no_advertise (0 xFFFFFF 02) attribute value to indicate that BGP routers do not ADVERTISE routing information with this attribute to other BGP peers, network controllability and security is further enhanced, and the corresponding External route tag value is 4294967042, which is added to the routing information for identification in operations such as route filtering and route redistribution.
By configuring the no_exit_subsonic fed (0 xFFFFFF 03) attribute value to indicate that BGP routes do not have routing information with the attribute published to external BGP peers (including peers in other member autonomous systems within the BGP federation), it is ensured that specific routing information is only propagated between specific BGP peers, BGP routing information propagation mechanisms are controlled, particularly within the BGP federation or sub-therapeutic systems, to ensure security and stability of the network, and the corresponding External route tag value is 4294967043.
It will be appreciated by those skilled in the art that implementing all or part of the above-described embodiment methods may be implemented by a computer program for instructing relevant hardware, and the program may be stored in a computer readable storage medium, and the program may include the embodiment flow of each control method as described above when executed. The storage medium may be a magnetic disk, an optical disc, a Read-only memory (ROM), a random access memory (RandomAccessMemory, RAM), a flash memory (flash memory), a hard disk (HDD), or a Solid State Drive (SSD); the storage medium may also comprise a combination of memories of the kind described above.
Example 2
Further, in another aspect of the present application, an apparatus is provided, configured to implement a method for delivering BGP community attribute values in OSPF according to any one of the foregoing embodiments, where the method includes:
a redistribution command configuration module configured to configure a redistribution command of the BGP route and a redistribution command of the OSPF route, respectively;
the BGP route redistribution module is configured to map the standard community attribute value of the BGP route into an external route label field of the OSPF route according to the redistribution command of the BGP route;
an OSPF route redistribution module configured to map label values of the external route label field to standard community attribute fields of the BGP route according to a redistribution command of the OSPF.
Example 3
Still further, another aspect of the present application provides a control system, including: a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured, when executing the executable instructions, to implement the method for communicating BGP community attribute values in OSPF of any of the above.
Embodiments of the present disclosure control a system that includes a processor and a memory for storing processor-executable instructions. Wherein the processor is configured to implement any of the methods for communicating BGP community attribute values in OSPF described above when executing the executable instructions.
Here, it should be noted that the number of processors may be one or more. Meanwhile, in the control system of the embodiment of the present disclosure, an input device and an output device may be further included. The processor, the memory, the input device, and the output device may be connected by a bus, or may be connected by other means, which is not specifically limited herein.
The memory is a computer-readable storage medium that can be used to store software programs, computer-executable programs, and various modules, such as: the embodiment of the disclosure provides a program or a module corresponding to a method for transmitting BGP community attribute values in OSPF. The processor executes various functional applications and data processing of the control system by running software programs or modules stored in the memory.
The input device may be used to receive an input number or signal. Wherein the signal may be a key signal generated in connection with user settings of the device/terminal/server and function control. The output means may comprise a display device such as a display screen.
Example 4
In yet another aspect of the present application, a non-transitory computer readable storage medium is provided, having stored thereon computer program instructions that, when executed by a processor, implement the method for communicating BGP community attribute values in OSPF of any of the above.
The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvement of the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (9)

1. A method for communicating BGP community attribute values in OSPF, comprising the steps of:
respectively configuring a redistribution command of a BGP route and a redistribution command of an OSPF route;
mapping the standard community attribute value of the BGP route to an external route label field of the OSPF route according to the redistribution command of the BGP route;
and mapping the label value of the external route label field to the standard community attribute field of the BGP route according to the redistribution command of the OSPF route.
2. The method for communicating BGP community attribute values in OSPF of claim 1, wherein the separately configuring the redistribution command for BGP routes and the redistribution command for OSPF routes comprises:
configuring a redistribution command of a BGP route, and adding a corresponding redistribution function switch in the redistribution command of the BGP route;
configuring a redistribution command of an OSPF route, and adding a corresponding redistribution function switch in the redistribution command of the OSPF route.
3. The method for communicating BGP community attribute values in OSPF of claim 1, wherein before mapping standard community attribute values of BGP routes into an external route label field of an OSPF route in accordance with a redistribution command of the BGP routes, further comprises:
and configuring a standard community attribute value of the BGP route.
4. The method for communicating BGP community attribute values in OSPF of claim 1, wherein the mapping the label value of the external routing label field to the standard community attribute field of the BGP route according to the redistribution command of the OSPF comprises:
determining a tag value in the external route tag field for a OSPF external routes route and OSPF NSSA external routes route of the OSPF routes;
and mapping the label value to the standard community attribute field of the BGP according to the redistribution command of the OSPF.
5. The method for communicating BGP community attribute values in OSPF of any of claims 1-4, wherein after mapping the label value of the external routing label field to the standard community attribute field of the BGP route according to the redistribution command of the OSPF, further comprises:
redistributing preset community attribute values in the BGP route to the OSPF route;
the preset community attribute values comprise an external propagation prohibition attribute value, an announcement prohibition attribute value and a propagation prohibition attribute value in a sub-autonomous system.
6. The method for communicating BGP community attribute values in OSPF of claim 5, wherein after mapping the label value of the external routing label field to the standard community attribute field of the BGP route according to the redistribution command of the OSPF, further comprises:
and configuring a label value of an external route label field corresponding to the preset community attribute value in the OSPF route.
7. An apparatus for implementing the method for delivering BGP community attribute values in OSPF of any of claims 1-6, comprising:
a redistribution command configuration module configured to configure a redistribution command of the BGP route and a redistribution command of the OSPF route, respectively;
the BGP route redistribution module is configured to map the standard community attribute value of the BGP route into an external route label field of the OSPF route according to the redistribution command of the BGP route;
and the OSPF route redistribution module is configured to map the label value of the external route label field to the standard community attribute field of the BGP route according to the redistribution command of the OSPF.
8. A control system, comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to implement the method for communicating BGP community attribute values in OSPF of any of claims 1 to 6 when executing the executable instructions.
9. A non-transitory computer readable storage medium having stored thereon computer program instructions, which when executed by a processor implement the method for communicating BGP community attribute values in OSPF of any of claims 1 to 6.
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