CN112637056A - Method and system for realizing dynamic adjustment of default route of metropolitan area network - Google Patents
Method and system for realizing dynamic adjustment of default route of metropolitan area network Download PDFInfo
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- CN112637056A CN112637056A CN202011555825.1A CN202011555825A CN112637056A CN 112637056 A CN112637056 A CN 112637056A CN 202011555825 A CN202011555825 A CN 202011555825A CN 112637056 A CN112637056 A CN 112637056A
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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
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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
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
Abstract
The invention discloses a method and a system for realizing the dynamic adjustment of default routing of a metropolitan area network, wherein the method comprises the following steps: step 1), a metropolitan area network CR dynamically acquires a default route from a backbone network by utilizing an EBGP protocol; step 2) forwarding the default route to a metropolitan area network route reflector RP through an IBGP protocol; and 3) the metro network route reflector RP reflects the default route to the convergence equipment, so that the loading of the default route of the convergence equipment or the linkage with the backbone network state is cancelled. The invention can realize the default route of the convergence equipment in the metropolitan area network, link the state of the backbone network, automatically load or cancel the corresponding default route, realize the automatic switching of the flow when the plane of the backbone network fails, and reduce the network influence brought by the failure to the second level.
Description
Technical Field
The invention belongs to the field of computers, and particularly relates to a method and a system for realizing plane fault self-healing of a metropolitan area network.
Background
In the prior art, there is a method for withdrawing a default route, which is generally applied to a device running a border gateway protocol BGP, and the method includes: when determining that the equipment has default route revocation information to be sent, carrying the default route revocation information in a first BGP message sent to a target BGP neighbor; the target BGP neighbor is an IBGP neighbor or an EBGP neighbor;
and when determining that the default route revocation information is sent to all target BGP neighbors of the equipment, locally deleting the default route indicated by the default route revocation information.
However, the above method is only applicable to a local area network with a small network scale, such as an enterprise campus network or a data center, and cannot realize linkage between an access layer and a core layer. In addition, in the carrier-level metropolitan area network, an independent route reflector is deployed, and the method cannot solve the problem that the traffic of the convergence equipment presses a single plane due to the fact that only one optimal route is reflected by the BGP protocol.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for realizing the dynamic adjustment of the default route of the metropolitan area network, thereby realizing the plane fault self-healing of the metropolitan area network.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for realizing the dynamic adjustment of default route of metropolitan area network includes:
step 1), a metropolitan area network CR dynamically acquires a default route from a backbone network by utilizing an EBGP protocol;
step 2) forwarding the default route to a metropolitan area network route reflector RP through an IBGP protocol;
and 3) the metro network route reflector RP reflects the default route to the convergence equipment, so that the loading of the default route of the convergence equipment or the linkage with the backbone network state is cancelled.
Wherein, in the step 1), the method specifically comprises the following steps:
the metropolitan area network CR establishes an EBGP neighbor relation with a backbone network, and the backbone network issues a default route to the metropolitan area network CR through the EBGP; the default route of the metro network CR routing table is changed to the dynamically learned EBGP route.
Wherein, in the step 2), the method specifically comprises the following steps:
the metropolitan area network CR and the metropolitan area network RR establish an IBGP neighbor relation, and an EBGP default route from the backbone network is notified to the metropolitan area network RR.
Wherein, in the step 3), the method specifically comprises the following steps:
establishing an IBGP (Internet protocol gateway protocol) neighbor relation between a metropolitan area network RR and convergence equipment, starting a BGP Add-Path function, and forwarding a default route announced by two metropolitan area networks CR (router discovery protocol) so that the convergence equipment learns the default route of the two metropolitan area networks CR;
the metropolitan area network convergence equipment starts an IBGP Multi-path to realize that the equivalent load of the default route is shared to two metropolitan area networks CR;
and the metropolitan area network CR cancels the configuration of the default route issued by the IS-IS and finishes the adjustment of the default route of the convergence equipment to the IBGP acquisition.
Wherein. When the first backbone network 1C1 has a single-plane fault, the EBGP neighbors between the first domain network CR1 and the first backbone network connected with the first backbone network are interrupted, and the EBGP default route linkage of the metropolitan area network CR1 fails;
the metro network RR will withdraw the EBGP default route from the first metro network CR 1;
meanwhile, the metro network RR will send update message to notify the aggregation device, cancel the default route to the first metro network CR1, implement automatic switching of the traffic of the aggregation device to the second metro network CR2, and go out from the second backbone network 2C1 plane.
Wherein, still include:
the first metropolitan area network CR1 learns the default route from the second metropolitan area network CR2 from the metropolitan area network RR, ensuring that the problem of route black holes at the first metropolitan area network CR1 does not occur for single-drop traffic under the metropolitan area network CR 1.
A system for implementing dynamic adjustment of default routes in a metropolitan area network, comprising:
the metropolitan area network CR is used for dynamically acquiring a default route from a backbone network by utilizing an EBGP protocol; forwarding the default route to a metro network route reflector RP via the IBGP protocol;
and the metro network route reflector RP is used for reflecting the default route to the convergence equipment, so that the loading of the default route of the convergence equipment or the linkage with the backbone network state is cancelled.
The metropolitan area network CR is used for dynamically acquiring a default route from a backbone network by utilizing an EBGP protocol; forwarding the default route to the metro network by the reflector RP through the IBGP protocol, which specifically includes:
the metropolitan area network CR establishes an EBGP neighbor relation with a backbone network, and the backbone network issues a default route to the metropolitan area network CR through the EBGP; the default route of the metro network CR routing table is changed to the dynamically learned EBGP route.
The metropolitan area network CR and the metropolitan area network RR establish an IBGP neighbor relation, and an EBGP default route from the backbone network is notified to the metropolitan area network RR.
Wherein the metropolitan area network is further configured by a reflector RP to:
establishing an IBGP (Internet protocol gateway protocol) neighbor relation between a metropolitan area network RR and convergence equipment, starting a BGP Add-Path function, and forwarding a default route announced by two metropolitan area networks CR (router discovery protocol) so that the convergence equipment learns the default route of the two metropolitan area networks CR;
the metropolitan area network convergence equipment starts an IBGP Multi-path to realize that the equivalent load of the default route is shared to two metropolitan area networks CR;
and the metropolitan area network CR cancels the configuration of the default route issued by the IS-IS and finishes the adjustment of the default route of the convergence equipment to the IBGP acquisition.
The invention can realize the default route of the convergence equipment in the metropolitan area network, link the state of the backbone network, automatically load or cancel the corresponding default route, realize the automatic switching of the flow when the plane of the backbone network fails, and reduce the network influence brought by the failure to the second level.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The present invention will be described in detail below with reference to the accompanying drawings so that the above advantages of the present invention will be more apparent. Wherein the content of the first and second substances,
fig. 1 is a schematic structural diagram of a system for implementing the method for dynamically adjusting default routes of a metropolitan area network according to the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
Additionally, the steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions and, although a logical order is illustrated in the flow charts, in some cases, the steps illustrated or described may be performed in an order different than here.
BGP (border gateway protocol): is a routing protocol for an autonomous system running on TCP. BGP is the only protocol used to handle networks as large as the internet and is the only protocol that can properly handle multiple connections between unrelated routing domains. The main function of the BGP system is to exchange network reachability information with other BGP systems. The network reachability information includes information for listed Autonomous Systems (AS). This information effectively constructs a topology map of the AS interconnect and thereby clears the routing loops, while policy decisions may be enforced at the AS level.
And (4) default routing: the routing table is a special static routing in the routing table, and when the routing of the message in the network cannot be matched with the routing record in the current routing table, the default routing is used for indicating a router or a network host to send the message to a specified position.
Add-Path: i.e., allow the exchange of NLRI (network layer reachability information) information between BGP peers, the ability to advertise multiple paths to the same NLRI.
Fig. 1 is a schematic structural diagram of a system for implementing the method for dynamically adjusting the default route of the metro network according to the present invention.
The method for realizing the dynamic adjustment of the default route of the metropolitan area network comprises the following steps:
step 1), a metropolitan area network CR dynamically acquires a default route from a backbone network by utilizing an EBGP protocol;
step 2) forwarding the default route to a metropolitan area network route reflector RP through an IBGP protocol;
and 3) the metro network route reflector RP reflects the default route to the convergence equipment, so that the loading of the default route of the convergence equipment or the linkage with the backbone network state is cancelled.
Wherein, in the step 1), the method specifically comprises the following steps:
the metropolitan area network CR establishes an EBGP neighbor relation with a backbone network, and the backbone network issues a default route to the metropolitan area network CR through the EBGP; the default route of the metro network CR routing table is changed to the dynamically learned EBGP route.
Wherein, in the step 2), the method specifically comprises the following steps:
the metropolitan area network CR and the metropolitan area network RR establish an IBGP neighbor relation, and an EBGP default route from the backbone network is notified to the metropolitan area network RR.
Wherein, in the step 3), the method specifically comprises the following steps:
establishing an IBGP (Internet protocol gateway protocol) neighbor relation between a metropolitan area network RR and convergence equipment, starting a BGP Add-Path function, and forwarding a default route announced by two metropolitan area networks CR (router discovery protocol) so that the convergence equipment learns the default route of the two metropolitan area networks CR;
the metropolitan area network convergence equipment starts an IBGP Multi-path to realize that the equivalent load of the default route is shared to two metropolitan area networks CR;
and the metropolitan area network CR cancels the configuration of the default route issued by the IS-IS and finishes the adjustment of the default route of the convergence equipment to the IBGP acquisition.
Wherein. When the first backbone network 1C1 has a single-plane fault, the EBGP neighbors between the first metropolitan area network CR1 and the first backbone network connected with the first backbone network are interrupted, and the EBGP default route linkage of the metropolitan area network CR1 fails;
the metro network RR will withdraw the EBGP default route from the first metro network CR 1;
meanwhile, the metro network RR will send update message to notify the aggregation device, cancel the default route to the first metro network CR1, implement automatic switching of the traffic of the aggregation device to the second metro network CR2, and go out from the second backbone network 2C1 plane.
Wherein, still include:
the first metropolitan area network CR1 learns the default route from the second metropolitan area network CR2 from the metropolitan area network RR, ensuring that the problem of route black holes at the first metropolitan area network CR1 does not occur for single-drop traffic under the metropolitan area network CR 1.
The method dynamically acquires the default route from the backbone network by using the EBGP protocol through the metropolitan area network CR, forwards the default route to a metropolitan area network reflector (hereinafter referred to as metropolitan area network RR) through the IBGP protocol, and reflects the default route to the convergence equipment by the metropolitan area network RR, so that the linkage between the convergence equipment default route loading/cancelling and the backbone network state is realized, the influence caused by the backbone network fault is reduced to the second level, the cross connection bandwidth requirement between the metropolitan area networks CR is reduced, and the network construction cost is effectively reduced.
Specifically, in one embodiment, it consists essentially of:
step 1, adjusting acquiescent route obtaining mode of CR of metropolitan area network
The method comprises the steps that an EBGP neighbor relation is established between a metropolitan area network CR and a backbone network, the backbone network issues a default route to the metropolitan area network CR through the EBGP, the traditional static default route configuration is cancelled by the metropolitan area network CR, and after adjustment, the default route of a metropolitan area network CR route table is changed into a dynamically learned EBGP route.
Step 2, the CR of the metropolitan area network advertises the learned EBGP default route
The metropolitan area network CR and the metropolitan area network RR establish an IBGP neighbor relation, and an EBGP default route from the backbone network is notified to the metropolitan area network RR.
Step 3, the convergence device adjusts the acquiescent route acquisition mode
The adjacent relation of the IBGP is established between the metropolitan area network RR and the convergence device, the BGP Add-Path function is started, and the default route announced by the two metropolitan area networks CR is forwarded, so that the problem that the convergence device can only learn the default route of one of the two metropolitan area networks CR due to the fact that the BGP only announces one optimal route is solved.
The domain area network convergence equipment starts the IBGP Multi-path to realize that the equivalent load of the default route is shared to the two metropolitan area networks CR.
And finally, the metropolitan area network CR cancels the configuration of the default route issued by the IS-IS, and finishes the adjustment of the default route of the convergence equipment to the IBGP acquisition.
When the backbone network single plane fails, for example, when the backbone network 1C1 fails, the EBGP neighbors of the metro network CR1 and the backbone network 1C1 are interrupted, the EBGP default route linkage of the metro network CR1 fails, and at this time, the metro network RR cancels the EBGP default route from the metro network CR 1.
Meanwhile, the metro network RR will send update message to inform the convergence device, cancel the default route to the metro network CR1, realize that the convergence device traffic is automatically switched to the metro network CR2, go out from the backbone network 2C1 plane, thereby reducing the influence time brought by the fault to the second level.
In addition, the metro network CR1 learns the default route from the metro network CR2 from the metro network RR, ensuring that traffic of a single-drop service (original single-drop or normal plane link failure) under the metro network CR1 does not cause a route black hole problem at the metro network CR 1.
The invention also provides a system for realizing the default route dynamic adjustment of the metropolitan area network, which is adapted to the method, and comprises the following steps:
the metropolitan area network CR is used for dynamically acquiring a default route from a backbone network by utilizing an EBGP protocol; forwarding the default route to a metro network route reflector RP via the IBGP protocol;
and the metro network route reflector RP is used for reflecting the default route to the convergence equipment, so that the loading of the default route of the convergence equipment or the linkage with the backbone network state is cancelled.
The metropolitan area network CR is used for dynamically acquiring a default route from a backbone network by utilizing an EBGP protocol; forwarding the default route to the metro network by the reflector RP through the IBGP protocol, which specifically includes:
the metropolitan area network CR establishes an EBGP neighbor relation with a backbone network, and the backbone network issues a default route to the metropolitan area network CR through the EBGP; the default route of the metro network CR routing table is changed to the dynamically learned EBGP route.
The metropolitan area network CR and the metropolitan area network RR establish an IBGP neighbor relation, and an EBGP default route from the backbone network is notified to the metropolitan area network RR.
Wherein the metropolitan area network is further configured by a reflector RP to:
establishing an IBGP (Internet protocol gateway protocol) neighbor relation between a metropolitan area network RR and convergence equipment, starting a BGP Add-Path function, and forwarding a default route announced by two metropolitan area networks CR (router discovery protocol) so that the convergence equipment learns the default route of the two metropolitan area networks CR;
the metropolitan area network convergence equipment starts an IBGP Multi-path to realize that the equivalent load of the default route is shared to two metropolitan area networks CR;
and the metropolitan area network CR cancels the configuration of the default route issued by the IS-IS and finishes the adjustment of the default route of the convergence equipment to the IBGP acquisition.
The invention can realize the default route of the convergence equipment in the metropolitan area network, link the state of the backbone network, automatically load or cancel the corresponding default route, realize the automatic switching of the flow when the plane of the backbone network fails, and reduce the network influence brought by the failure to the second level.
It should be noted that for simplicity of description, the above method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present application is not limited by the order of acts described, as some steps may occur in other orders or concurrently depending on the application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects.
Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the 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 (9)
1. A method for realizing the dynamic adjustment of default route of metropolitan area network is characterized in that the method comprises the following steps:
step 1), a metropolitan area network CR dynamically acquires a default route from a backbone network by utilizing an EBGP protocol;
step 2) forwarding the default route to a metropolitan area network route reflector RP through an IBGP protocol;
and 3) the metro network route reflector RP reflects the default route to the convergence equipment, so that the loading of the default route of the convergence equipment or the linkage with the backbone network state is cancelled.
2. The method for implementing dynamic adjustment of default routing in metropolitan area network according to claim 1, wherein step 1) specifically comprises:
the metropolitan area network CR establishes an EBGP neighbor relation with a backbone network, and the backbone network issues a default route to the metropolitan area network CR through the EBGP; the default route of the metro network CR routing table is changed to the dynamically learned EBGP route.
3. The method according to claim 1, wherein the step 2) specifically includes:
the metropolitan area network CR and the metropolitan area network RR establish an IBGP neighbor relation, and an EBGP default route from the backbone network is notified to the metropolitan area network RR.
4. The method according to claim 1, wherein the step 3) specifically includes:
establishing an IBGP (Internet protocol gateway) neighbor relation between a metropolitan area network RR and convergence equipment, starting a BGPAdd-Path function, and forwarding default routes announced by two metropolitan area networks CR (cognitive radio network) so that the convergence equipment learns the two metropolitan area networks CR default routes;
the metropolitan area network convergence equipment starts an IBGP Multi-path to realize that the equivalent load of the default route is shared to two metropolitan area networks CR;
and the metropolitan area network CR cancels the configuration of the default route issued by the IS-IS to complete the adjustment of the default route of the convergence equipment to IBGP silvergrass.
5. The method according to claim 1 or 4, wherein when the first backbone network 1C1 has a single plane failure, the EBGP neighbor between the first metro network CR1 and the first backbone network connected thereto is interrupted, and the linkage of the EBGP default route of the metro network CR1 fails;
the metro network RR will withdraw the EBGP default route from the first metro network CR 1;
meanwhile, the metro network RR will send update message to notify the aggregation device, cancel the default route to the first metro network CR1, implement automatic switching of the traffic of the aggregation device to the second metro network CR2, and go out from the second backbone network 2C1 plane.
6. The method for implementing dynamic metro network default route adjustment according to claim 5, further comprising:
the first metropolitan area network CR1 learns the default route from the second metropolitan area network CR2 from the metropolitan area network RR, ensuring that the problem of route black holes at the first metropolitan area network CR1 does not occur for single-drop traffic under the metropolitan area network CR 1.
7. A system for implementing dynamic adjustment of default routes in a metropolitan area network, comprising:
the metropolitan area network CR is used for dynamically acquiring a default route from a backbone network by utilizing an EBGP protocol; forwarding the default route to a metro network route reflector RP via the IBGP protocol;
and the metro network route reflector RP is used for reflecting the default route to the convergence equipment, so that the loading of the default route of the convergence equipment or the linkage with the backbone network state is cancelled.
8. The system according to claim 7, wherein the metropolitan area network CR is configured to dynamically obtain the default route from the backbone network using an EBGP protocol; forwarding the default route to the metro network by the reflector RP through the IBGP protocol, which specifically includes:
the metropolitan area network CR establishes an EBGP neighbor relation with a backbone network, and the backbone network issues a default route to the metropolitan area network CR through the EBGP; the default route of the metro network CR routing table is changed to the dynamically learned EBGP route.
The metropolitan area network CR and the metropolitan area network RR establish an IBGP neighbor relation, and an EBGP default route from the backbone network is notified to the metropolitan area network RR.
9. The system for implementing dynamic metro network default route adjustment according to claim 1, wherein said metro network is further configured by a reflector RP for:
establishing an IBGP (Internet protocol gateway protocol) neighbor relation between a metropolitan area network RR and convergence equipment, starting a BGP Add-Path function, and forwarding a default route announced by two metropolitan area networks CR (router discovery protocol) so that the convergence equipment learns the default route of the two metropolitan area networks CR;
the metropolitan area network convergence equipment starts an IBGP Multi-path to realize that the equivalent load of the default route is shared to two metropolitan area networks CR;
and the metropolitan area network CR cancels the configuration of the default route issued by the IS-IS and finishes the adjustment of the default route of the convergence equipment to the IBGP acquisition.
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